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Drive waveform

Subclass of:

347 - Incremental printing of symbolic information

347001000 - INK JET

347005000 - Controller

347009000 - Of ejector

Patent class list (only not empty are listed)

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Class / Patent application numberDescriptionNumber of patent applications / Date published
347011000 Plural pulses 93
Entries
DocumentTitleDate
20130044149INKJET RECORDING APPARATUS - An inkjet recording apparatus includes an ink particle generation unit that makes a pressurized ink injected from a nozzle into particles, a charging unit that electrically charges the ink particle of those subjected to particulation, which corresponds to a dot to be printed, a polarizing unit that polarizes the electrically charged ink particle in a polarizing electric field, a collection unit that allows a gutter to collect the ink particle corresponding to the dot that is not printed, and a character forming unit that forms a character as a dot matrix on a printing object. A phase detection charging signal is applied to the ink particle that is not used for printing when forming the dot matrix character so as to detect an optimum charging timing in a process of forming the dot matrix character.02-21-2013
20130083106DEVICE AND METHOD FOR DRIVING LIQUID DISCHARGE HEAD, LIQUID DISCHARGE APPARATUS, AND INK-JET APPARATUS - A basic driving waveform which includes a plurality of jet pulses and a non-jet pulse just before the last jet pulse in one recording period is generated. A part of the pulses is removed from the basic driving waveform by maintaining at least the last jet pulse, and a driving signal that is applied to a discharge energy generation element is generated. In the case of using only the last jet pulse among the plurality of jet pulses is used for the jet, a first driving signal that includes the non-jet pulse just before the last jet pulse is generated. In the case of joining the last jet pulse and at least another jet pulse among the plurality of jet pulses to use the pulses for the jet, a second driving signal that is configured to remove the non-jet pulse is generated.04-04-2013
20130083104INKJET PRINTER AND IMAGE RECORDING METHOD - In an inkjet printer, for forming a large dot on a recording paper in the course of image recording, a second ejection pulse (04-04-2013
20130083107INKJET RECORDING APPARATUS AND METHOD, AND ABNORMAL NOZZLE DETERMINATION METHOD - According to the present invention, the occurrence of an ejection abnormality can be determined at an early stage by using a waveform for abnormal nozzle determination, before an image defect producing a visible density non-uniformity (stripe non-uniformity) occurs due to an ejection defect in an output image recorded by a drive signal having a recording waveform. Consequently, recording stability and throughput can both be achieved.04-04-2013
20130083105INKJET PRINTER AND IMAGE RECORDING METHOD - In an inkjet printer, an ejecting part for K color is previously selected as an ejecting part for outputting three values used for formation of a large dot, formation of a medium dot, and non-ejection (step S04-04-2013
20100165024INK JET PRINTER AND METHOD FOR DEPOSITING A PROTECTIVE LAYER ON A SUBSTRATE - A protective layer is applied to a substrate moving relative to an ink jet nozzle array. Each nozzle responds to a piezoelectric actuator. Shapes of ink droplets deposited by the nozzles on the substrate, to form the protective layer, are controlled by shapes of electric waveforms applied to the actuators. Shapes of the waveforms respond to at least one of: droplet viscosity and temperature, temperature of the substrate, desired thickness of the layer, type of substrate surface to which the droplets are applied, and relative speed of the substrate and the ink jet nozzle array.07-01-2010
20100165025PRINTHEAD, HEAD CARTRIDGE, AND PRINTING APPARATUS - An object of this invention is to provide a printhead tolerant of switching noise occurred when concurrently driving plural printing elements, a head cartridge using the printhead, and a printing apparatus. To achieve this object, a printhead includes plural printing elements and plural driving elements for driving the plural printing elements, and prints by these printing elements. The printhead includes the following arrangement. More specifically, the printhead includes a shift register which receives print data in synchronism with a clock signal, and a latch circuit which latches the print data input to the shift register in synchronism with a latch signal. The printhead further includes a restriction circuit which restricts input of the print data and clock signal to the shift register and input of the latch signal to the latch circuit in synchronism with input of an enable signal for driving the plural driving elements.07-01-2010
20100118074RECODING ELEMENT SUBSTRATE, RECORDING HEAD EQUIPPED WITH THE SAME, RECORDING HEAD CARTRIDGE, AND RECORDING APPARATUS - A recording element substrate which is provided with a first recording element group and a second recording element group, each group including a plurality of recording elements. The recording element substrate includes a first terminal configured to input a data signal, a second terminal configured to input a latch signal, a shift register configured to receive the data signal input from the first terminal, a first latch circuit configured to latch data stored in the shift register based on the latch signal of a first pulse width input from the second terminal, a second latch circuit configured to latch the data stored in the shift register based on the latch signal of a second pulse width which is shorter than the first pulse width of the latch signal input from the second terminal, a first driving circuit configured to control driving of the recording elements included in the first recording element group based on a signal output from the first latch circuit, and a second driving circuit configured to control driving of the recording elements included in the second recording element group based on a signal output from the second latch circuit.05-13-2010
20100118072Method For Driving Liquid Ejector - A method for driving a liquid drop ejector (05-13-2010
20110205272DROPLET EJECTING DEVICE CAPABLE OF INCREASING NUMBER OF TONES EFFICIENTLY - A voltage-set-information storing section stores two or more kinds of voltage sets each including a combination of first and second voltages for each number of droplets ejected from an ejection port within a single recording cycle. A voltage applying section is configured to apply the first voltage to an active portion of a first piezoelectric layer and to apply the second voltage to an active portion of a second piezoelectric layer based on image data of the image. The voltage applying section is configured to select one of the two or more kinds of voltage sets stored in the voltage-set-information storing section and to apply each voltage constituting the selected voltage set to the active portions of the first and second piezoelectric layers. The voltage sets are classified by a degree of temporal overlapping of pulse-shaped voltages included in the first and second voltages.08-25-2011
20090195577INKJET PRINTING APPARATUS AND INK EJECTION CONTROL METHOD - For the temperature adjustment process that uses high viscosity ink and is based on table No. 08-06-2009
20090195576LIQUID JET APPARATUS AND PRINTING APPARATUS - A liquid jet apparatus of the invention includes a drive waveform generator that generates a drive waveform signal, a modulator that pulse-modulates the drive waveform signal so as to produce a modulated signal, a digital power amplification circuit that amplifies the power of the modulated signal so as to produce an amplified digital signal, and a low pass filter that smoothes the amplified digital signal so as to produce a drive signal. The digital power amplification circuit includes multiple stages of digital power amplifiers each including a pair of switching elements that are push-pull-connected. The amplified digital signal is a multi-value signal that reaches a larger number of steps of electric potentials than the number of digital power amplifiers.08-06-2009
20090195575METHOD OF CONTROLLING NOZZLES OF INKJET HEAD AND APPARATUS FOR MEASURING AMOUNTS OF INK EJECTED FROM NOZZLES OF INKJET HEAD - Provided are method of controlling nozzles of an inkjet head and an apparatus for measuring the amounts of ink ejected from the nozzles of the inkjet head. The method includes: preparing a mass measuring device, which measures the mass of ink by using an oscillation change, in a pixel; ejecting ink into the pixel from a nozzle of the inkjet head, and measuring the amount of ink ejected from the nozzle by using the mass measuring device; and adjusting a voltage waveform applied to the nozzle of the inkjet head.08-06-2009
20110193903Monitoring apparatus for inkjet head - There is provided a monitoring apparatus for an inkjet head including a resistance element connected between a driving circuit generating a driving signal and a piezoelectric element applying pressure to an ink chamber according to the driving signal, an amplifier unit amplifying a differential voltage between an output voltage from the driving circuit and a voltage generated in the piezoelectric element, and a detecting unit detecting whether ink is being normally ejected, based on the amplified differential voltage from the amplifier unit.08-11-2011
20090231371APPARATUS AND METHOD FOR SUPPLYING VOLTAGE TO NOZZLE IN INKJET PRINTER - A power supplying apparatus for a plurality of nozzles included in a thermal inkjet printer is provided. The thermal inkjet printer is capable of providing a plurality of printing modes. The power supplying apparatus includes a look-up table, a selecting module, and an adjustable voltage supply. The look-up table stores plural sets of control signals corresponding to the plurality of printing modes. The selecting module first receives a command representing that a user selects one printing mode among the plurality of printing modes as a final printing mode. The selecting module then selects one set of control signals stored in the look-up table as a set of final control signals based on the command. The adjustable voltage supply supplies at least one voltage to the plurality of nozzles based on the final control signal selected by the selecting module.09-17-2009
20100073416LIQUID DROPLET EJECTION CONTROL APPARATUS AND LIQUID DROPLET EJECTING APPARATUS - In a liquid droplet ejection control apparatus, a plurality of head control (HC) boards are disposed in correspondence to ejectors that eject liquid droplets and are plurally arrayed in a liquid droplet ejecting head, and the HC boards are connected to each other in a daisy chain by a synchronization signal line. Each of the HC boards is equipped with a memory for storing identification information. When an identification signal representing the identification information is superimposed on a synchronization signal received via the synchronization signal line from a prior stage, the identification information that the identification signal represents is stored in the memory, the identification signal superimposed on the received synchronization signal is changed so as to represent identification information different from the identification information that the identification signal represents, and the synchronization signal on which the changed identification signal has been superimposed is transmitted to a later stage.03-25-2010
20130083108INKJET RECORDING APPARATUS AND METHOD - An inkjet recording apparatus includes: an inkjet head which has a nozzle and an ejection energy generating element configured to cause droplets to be ejected from an ejection port of the nozzle; a head movement device which is configured to reciprocally move the inkjet head to scan a recording medium onto which the droplets ejected from the inkjet head are deposited; a linear encoder which is configured to output signals to determine a position of the inkjet head; an ejection trigger signal generating device which is configured to generate ejection trigger signals in accordance with the output signals of the linear encoder, the ejection trigger signals specifying ejection timings of the inkjet head with a temporal resolution of 0.1 μs order; and an ejection control device which is configured to cause the inkjet head to eject the droplets in accordance with the ejection timings specified by the ejection trigger signals.04-04-2013
20130038654LIQUID EJECTING DEVICE - A liquid ejecting device includes a driving waveform signal generating circuit that generates a driving waveform signal, a modulation circuit that performs pulse modulation on the driving waveform signal to generate a modulation signal, a digital power amplifier that amplifies power of the modulation signal to generate a power amplification modulation signal in the form of a pulse wave, a filter that smoothes the power amplification modulation signal in the pulse wave to generate the driving signal, a connection cable that connects the filter to the capacitive load and is provided such that at least one of the filter and the capacitive load is detachable, a connection line information acquiring unit that acquires connection line information associated with the connection cable, and a frequency changing unit that changes a frequency when the modulation circuit performs the pulse modulation on the driving waveform signal, on the basis of the connection line.02-14-2013
20130033534CONTROL METHOD OF AND CONTROL DEVICE FOR CONTROLLING LIQUID EJECTION HEAD, AND LIQUID EJECTING APPARATUS - A drive signal includes a first drive signal and a second drive signal. The first drive signal includes a prior pulse section including a first contraction element and a discharging pulse section including a first expansion element pulling in a meniscus and the second contraction element discharging a droplet of liquid from the nozzle orifice. The second drive signal includes the discharging pulse section and a vibration control pulse section including a second expansion element controlling a residual vibration of the meniscus. A piezoelectric element is driven with the first drive signal when viscosity of the liquid is equal to or more than a first set value and is driven with the second drive signal when the viscosity is equal to or less than a second set value.02-07-2013
20100103210LIQUID DISCHARGING APPARATUS - A liquid discharging apparatus includes a liquid discharging head that has nozzle groups each having a plurality of nozzles. The liquid discharging head discharges liquid from the nozzles through the operation of pressure generation elements. A first driving signal generating section generates, in a generation cycle, a first driving signal that includes a discharging pulse for discharging liquid by driving the pressure generation elements. A second driving signal generating section generates, in the generation cycle, a second driving signal that includes the discharging pulse. A controlling section selects a discharging pulse included in the first driving signal or the second driving signal based on discharging control information for controlling the discharging of the liquid and supplies the selected discharging pulse to the pressure generation elements to control the discharging of the liquid. The controlling section makes discharging-pulse selection for each nozzle group.04-29-2010
20100103213FLUID EJECTION DEVICE - A fluid ejection device that ejects fluid from an ejection port includes: a drive element that ejects fluid in accordance with a difference between voltages applied to a first terminal and a second terminal; a drive voltage waveform storing unit that stores a drive voltage waveform applied to the drive element; a plurality of power supplies each having a different voltage; and a drive voltage waveform applying unit that applies the drive voltage waveform to the drive element by switching among the plurality of power supplies connected to the first and second terminals of the drive element.04-29-2010
20100103209LIQUID EJECTING APPARATUS AND METHOD OF CONTROLLING LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes: nozzles which eject a liquid by an operation of a pressure generating unit; and a driving signal generating unit which generates a driving signal containing plural ejection pulses used to eject the liquid from the nozzles by operating the pressure generating unit. The liquid is ejected from the nozzles and landed on a landing target to form dots by selectively applying the ejection pulses contained in the driving signal to the pressure generating unit. A first mode where two dots are formed in one pixel area of the landing target by selecting two ejection pulses, which are formed at a first time interval, from the ejection pulses contained in the driving signal and driving the pressure generating unit or a second mode where two dots are formed in one pixel area of the landing target by selecting two ejection pulses, which are formed at a second time interval longer than the first time interval, from the ejection pulses contained in the driving signal and driving the pressure generating unit is selected depending on an ejection condition.04-29-2010
20100110129INKJET PRINTER FOR PHOTOGRAPHS - A photo printer that prints 6″×4″ photos that has a stationary printhead. The printhead has a plurality of color channels, each color channel comprising at least one nozzle row extending along the length of said printhead, each nozzle in a color channel ejecting the same colored ink. The photo printer also has means for continuously moving 6″×4″ paper sheets past the printhead and during use, all firing nozzles of each color channel selected for one line of printing are fired within about 200 microseconds.05-06-2010
20120262512PIEZOELECTRIC ELEMENT DRIVE CIRCUIT AND FLUID EJECTION DEVICE - A reference voltage waveform reciprocating between a first voltage and a second voltage is supplied to a piezoelectric element via a switch. If a switch is set to a connected state (ON), the reference voltage waveform is applied to the piezoelectric element, and if the switch is set to a disconnected state (OFF), the voltage when the switch is set to OFF continues to be applied. Therefore, it becomes possible to apply a variety of drive signals only by switching the switch in accordance with increase and decrease of the reference voltage waveform, and there is no need to store a plurality of types of drive signals. Further, it is possible to start to apply the drive signal immediately when the voltage of the reference voltage waveform reaches the target voltage.10-18-2012
20130135371INK JET RECORDING APPARATUS - An ink jet recording apparatus includes a recording head and a driving unit. The recording head includes a plurality of element columns. Each element column includes a plurality of recording elements arrayed in a first direction to discharge ink, and is divided into a plurality of groups including a plurality of continuous recording elements. The driving unit drives the recording head and execute control so that the plurality of recording elements in each group is driven in order at a specific time interval. A number of the element columns is equal to or larger than a number of recoding elements in a group. The driving unit controls driving of the plurality of element columns so that recorded data of one column is recorded within a conveyance width of a recording medium to be conveyed within the specific time interval.05-30-2013
20100110127Liquid Ejecting Apparatus And Control Method Of Liquid Ejecting Apparatus - A maintenance drive pulse group FL has a plurality of drive pulses DP05-06-2010
20120212528INKJET PRINTHEAD AND PRINTING APPARATUS - This invention is directed to decreasing the number of head contacts which increases along with increases in the numbers of ink colors and nozzles used in a printhead and the length of the printhead. To accomplish this, a reception unit which receives a serialized control parameter having an identification code indicating a normal drive pulse for discharging ink or a pulse short enough not to discharge ink is arranged on the head substrate of a printhead. Further, a normal pulse generation unit which generates the normal drive pulse based on a received control parameter, and a short pulse generation unit which generates the short pulse based on a received control parameter are arranged on the head substrate. Based on the identification code of the control parameter, it is controlled to output the normal drive pulse or short pulse.08-23-2012
20130027453LIQUID EJECTING APPARATUS AND METHOD OF CONTROLLING LIQUID EJECTING APPARATUS - A CPU serving as a counting unit counts the cumulative number of times a driving pulse is applied to a piezoelectric vibrator. A driving signal generation unit is able to generate an aging driving pulse set by a driving parameter to the extent that ink is not ejected from a nozzle and performs an aging process of driving the piezoelectric vibrator using the aging driving pulse set by a driving parameter in accordance with a cumulative number of applications in a region outside an ejection region on a recording medium.01-31-2013
20100066776INK JET HEAD DRIVING APPARATUS - Provided is an ink jet head driving apparatus which can highly accurately control jetting timing separately for each of a plurality of nozzles of a head without increasing the number of signal lines and can change the jetting timing for each jetting cycle.03-18-2010
20120182340INKJET PRINTER AND PRINTING METHOD - To more appropriately carry out generation of a drive waveform signal used in an actuator drive in an inkjet head. An inkjet printer (07-19-2012
20120182339CAPACITIVE LOAD DRIVING CIRCUIT AND LIQUID EJECTION DEVICE - A liquid ejection device, includes: a drive waveform signal output circuit which outputs a drive waveform signal to serve as a reference for the drive signal; a modulator which pulse-modulates the drive waveform signal and thus generates a first modulated signal and a second modulated signal having a different phase from the first modulated signal within a range from greater than 90 degrees to smaller than 270 degrees; a first digital power amplifier; a second digital power amplifier a first low pass filter which performs low pass filtering of the first amplified digital signal and thus generates a first demodulated signal; and a second low pass filter which performs low pass filtering of the second amplified digital signal and thus generates a second demodulated signal; wherein the first demodulated signal and the second demodulated signal are combined and applied as the drive signal to the capacitive load.07-19-2012
20120182338RECORDING APPARATUS AND METHOD FOR CONTROLLING RECORDING APPARATUS - A recording apparatus including a recording head that includes an element array of a plurality of recording elements for discharging a liquid, the plurality of recording elements in the element array being divided into groups, and a drive unit configured to drive the recording head in a driving mode selected from a plurality of driving modes including a continuous driving mode in which recording elements in each of the groups are driven in order from one end and a distributed driving mode in which recording elements in each of the groups are driven such that adjacent recording elements are not driven sequentially.07-19-2012
20100002033METHOD FOR COMPENSATING SHIFT IN ON RESISTANCE OF TRANSISTOR OF PRINTHEAD - Disclosed is a method for compensating a shift in an ON resistance of a transistor in a chip of a printhead of an inkjet printer. The method includes determining a value of a life indication parameter of the printhead and comparing the determined value of the life indication parameter of the printhead with at least one predetermined value of the life indication parameter. The at least one predetermined value of the life indication parameter of the printhead is stored in at least one of a memory of the inkjet printer and a memory of the chip of the printhead. Thereafter, a gate voltage input to the transistor is modified based on a difference between the determined value of the life indication parameter and the at least one predetermined value of the life indication parameter of the printhead for compensating the shift in the ON resistance of the transistor.01-07-2010
20090303271HEAD DRIVE DEVICE AND DRIVE CONTROL METHOD OF INK JET PRINTER, AND INK JET PRINTER - A head drive apparatus of an ink jet printer having: a plurality of nozzles for jetting liquid drops that are provided for an ink jet head; a plurality of actuators provided in correspondence to the nozzles; and a drive unit that applies a drive signal to the actuators, wherein the drive unit comprising: a drive waveform generator that generates a drive waveform signal being standard of a signal to control drive of the actuators; a modulator that modulates a pulse of a drive waveform signal generated by the drive waveform generator; a digital power amplifier for amplifying power of a modulated signal subjected to the pulse modulation by the modulator; and a low pass filter for smoothing an amplified digital signal subjected to the power amplification by the digital power amplifier and supplying the signal as a drive signal to the actuators.12-10-2009
20120218333DRIVE APPARATUS FOR LIQUID EJECTION HEAD, LIQUID EJECTION APPARATUS AND INKJET RECORDING APPARATUS - A drive apparatus for a liquid ejection head, includes a drive signal generating device for generating a drive signal to operate an ejection energy generating element provided so as to correspond to a nozzle of the liquid ejection head, the drive signal being supplied to the ejection energy generating element so that a liquid droplet is caused to be ejected from the nozzle, wherein: the drive signal includes a plurality of ejection pulses for performing a plurality of ejection operations during one recording period, in a remaining pulse sequence excluding a final pulse of the plurality of ejection pulses, a voltage amplitude of a subsequent pulse is smaller than a voltage amplitude of a preceding pulse, and the final pulse has a largest voltage amplitude, of the plurality of ejection pulses.08-30-2012
20130057609RECORDING HEAD AND RECORDING APPARATUS USING RECORDING HEAD - A recording head having a plurality of recording elements that are grouped into a plurality of blocks and ejecting ink by driving the recording elements in a time-divisional manner includes driving units configured to drive the recording elements, an input unit configured to receive an enable signal that defines a period during which the driving of the recording elements is enabled at one ink ejection, and a control unit configured to control the time-divisional driving by the driving units on the basis of pulses detected during the period defined by the enable signal received by the input unit.03-07-2013
20130057610SWITCHABLE FEEDBACK DAMPING OF DROP-ON-DEMAND PIEZOELECTRIC FLUID-EJECTION MECHANISM - A control circuit for a drop-on-demand piezoelectric fluid-ejection mechanism includes a drive and sense circuit, and a switch. The drive and sense circuit has an input, a drive output, and a sense output. The drive output is to be coupled to the drop-on-demand piezoelectric fluid-ejection mechanism. The switch is to switch the input of the drive and sense circuit between a feed-forward driving mode of the drive and sense circuit and a feedback damping mode of the drive and sense circuit. In the feed-forward driving mode, the switch is to couple the input to a drive waveform to cause the fluid-ejection mechanism to eject a drop of fluid. In the feedback damping mode, the switch is to couple the input to the sense output to dampen the fluid-ejection mechanism after the fluid-ejection mechanism has ejected the drop of fluid.03-07-2013
20110012948FLUID EJECTING APPARATUS, FLUID EJECTING HEAD CONTROL METHOD IN FLUID EJECTING APPARATUS, AND DRIVING WAVEFORM GENERATING APPARATUS FOR FLUID EJECTING HEAD - Disclosed is a fluid ejecting apparatus including a fluid ejecting head that ejects fluid, a waveform generator that transmits a driving waveform for driving the fluid ejecting head to the fluid ejecting head, and a waveform designation signal transmitter that transmits a waveform designation signal for designating a driving waveform to be generated to the waveform generator, wherein the waveform generator transmits the driving waveform at a timing based on a reception timing of the waveform designation signal.01-20-2011
20090267979LIQUID JET APPARATUS AND PRINTING APPARATUS - A liquid jet apparatus according to the present invention is a liquid jet apparatus including a plurality of nozzles, an actuator provided for each nozzle and connected to the respective nozzle, a drive waveform signal generation unit that generates a drive pulse, and a drive unit that applies the drive pulse to the actuator, wherein the drive unit includes a transistor pair, wherein the transistor pair: has two transistors connected to each other in a push-pull manner, and power-amplifies the drive pulse. The drive unit also includes a low-pass filter disposed between the transistor pair and the actuator.10-29-2009
20120223986LIQUID EJECTING APPARATUS - A platen includes a main body, a plurality of support protrusions protruding on the surface of the side opposite a nozzle formation surface when ejection is performed, in the main body, in which a voltage that is applied to the platen is set such that the intensity of an electric field generated between nozzles and an individual driving electrode of a recording head when ink is ejected from the nozzles is in between the intensity of an electric field generated between the nozzle formation surface and the support protrusions and the intensity of an electric field generated between the nozzle formation surface and the main body.09-06-2012
20130063506CIRCUIT DEVICE AND DROPLET EJECTION APPARATUS - A circuit device drives actuator elements respectively associated with a plurality of nozzles to cause droplets to be ejected from the nozzles. The circuit device includes input terminals; a receiving unit; a switching unit; and a transfer unit. The receiving unit receives, via the input terminals, input signals including a terminal arrangement signal and drive signals for driving the actuator elements. The terminal arrangement signal indicates a type of assignment of signals to be assigned to the input terminals. The switching unit switches the assignment of signals in accordance with the terminal arrangement signal. The transfer unit transfers, to the actuator elements, drive signals that are input to the input terminals after the assignment of signals has been switched.03-14-2013
20090237433Printhead Integrated Circuit With Low Drive Transistor To Nozzle Area Ratio - A inkjet printhead integrated circuit that has a wafer substrate with a fluid ejection surface, and an array of drop ejectors for ejecting drops of printing fluid onto a media substrate, the array being formed on the fluid ejection surface of the wafer substrate. Each drop ejector has a nozzle through which the drops are ejected, an actuator for ejecting drops through the nozzle and, a drive transistor for energizing the actuator with a drive pulse. The area of the drive transistor projected onto the fluid ejection surface is less than 37 times the area of the nozzle.09-24-2009
20090237432System And Method For Evaluating Line Formation In An Ink Jet Imaging Device To Normalize Print Head Driving Voltages - A method enables an ink jet imaging device to normalize the driving signals for the ink jets within a print head of the device. The method includes generating an ink jet driving signal at an initial voltage and a particular resolution, coupling the ink jet driving signal to an ink jet for selective emission of ink from the ink jet onto an ink receiver in accordance with the driving signal, scanning the ink receiver and generating a line discontinuity signal indicative of a number of discontinuities detected in a line formed on the ink receiver by the ink ejected from the ink jet, and adjusting one of a voltage and a resolution for the ink jet driving signal in response to the line discontinuity signal received from the scanner.09-24-2009
20130162708LIQUID EJECTING APPARATUS AND CONTROL METHOD OF LIQUID EJECTING HEAD - A liquid ejecting apparatus includes: a piezoelectric element equipped with a piezoelectric layer contained a barium titanate-based complex oxide and electrodes that are provided in the piezoelectric layer; a temperature detection unit that detects temperatures; and a polarization unit that supplies a repolarization waveform to repolarize the piezoelectric layer to the piezoelectric element in the case where the temperature detection unit detects a predetermined temperature condition.06-27-2013
20090027430METHOD FOR DISCHARGING LIQUID MATERIAL, METHOD FOR MANUFACTURING COLOR FILTER, AND METHOD FOR MANUFACTURING ORGANIC EL ELEMENT - A method for discharging a liquid material includes performing a scan by moving a discharge target having a film formation area and a plurality of nozzles forming a nozzle row with respect to each other, and discharging a liquid material as droplets from the nozzles onto the film formation area by selectively applying one of drive waveforms generated using time division to an energy generation element of each of the nozzles in synchronization with the scan. The discharging of the liquid material includes applying a first drive waveform to a first nozzle of the nozzle row and a second drive waveform having a different discharge timing from the first drive waveform to a second nozzle of the nozzle row with the second nozzle being adjacent to the first nozzle, and changing a combination of the first and second drive waveforms selected from the drive waveforms at least once.01-29-2009
20090027429INKJET IMAGE FORMING APPARATUS AND METHOD TO CONTROL THE SAME - An inkjet image forming apparatus and a method to control the same are provided to prevent a reduction in the print image quality due to inkjet nozzle deformation. The trajectory direction of ink inclined by inkjet nozzle deformation is corrected by controlling the amount of heat generated by a plurality of heaters that are arranged in parallel to the conveyance direction of paper for each inkjet nozzle provided on an inkjet head chip mounted in an inkjet print head.01-29-2009
20090009546ELEMENT BOARD FOR PRINTHEAD, PRINTHEAD AND PRINTHEAD CONTROL METHOD - In a printhead having a plurality of printing elements, a shift register which serially receives printing data corresponding to the number of printing elements, a latch which latches the printing data input to the shift register, and a driving circuit which selectively drives the printing elements in accordance with the printing data latched by the latch and a signal representing a driving period, the latch state of the latch is controlled by the signal representing the driving period. The signal representing the driving period and a signal for controlling the latch state of the latch are commonly used to decrease the number of input terminals of the printhead.01-08-2009
20090009545PRINTHEAD, HEAD CARTRIDGE, AND PRINTING APPARATUS - An object of this invention is to provide a printhead tolerant of switching noise occurred when concurrently driving plural printing elements, a head cartridge using the printhead, and a printing apparatus. To achieve this object, a printhead includes plural printing elements and plural driving elements for driving the plural printing elements, and prints by these printing elements. The printhead includes the following arrangement. More specifically, the printhead includes a shift register which receives print data in synchronism with a clock signal, and a latch circuit which latches the print data input to the shift register in synchronism with a latch signal. The printhead further includes a restriction circuit which restricts input of the print data and clock signal to the shift register and input of the latch signal to the latch circuit in synchronism with input of an enable signal for driving the plural driving elements.01-08-2009
20110018921PRINTING DEVICE AND PRINTING METHOD - A printing device that forms a background by a first ink and images on the background by a second ink includes a head having first and second nozzle lines that eject, respectively, the first and second inks. The inks are ejected as the head moves, with respect to a medium, in a main scanning direction intersecting the first and second nozzle lines. A transport section transports the medium in a sub-scanning direction along the first and second nozzle lines. In an ejecting operation, the first and second inks are ejected in the relative movement in the main scanning direction and the relative transportation is performed. In the ejecting operation, more nozzles are used in the second nozzle line than in the first nozzle line, and more ejections are performed from the second nozzle line than from the first nozzle line, thereby filling a predetermined width in the sub-scanning direction.01-27-2011
20120113177INKJET PRINTER - A inkjet printer including a plurality of heads installed in a staggered arrangement, and a relay board for receiving image data, a control signal conforming to each head, and a timing signal for determining timed intervals to emit ink particles from the control unit of the inkjet printer, and for sending the received image data, control signal and timing signal to the aforementioned plurality of respective drive signal generating circuits.05-10-2012
20120113176Method And System For Reflex Printing To Compensate For Registration Errors In A Continuous Web Inkjet Printer - A method of operating a printer enables compensation parameters to be generated and stored in association with system conditions detected at the time of the compensation parameter generation. Upon detection of corresponding system conditions at a later time, the printer is able to use the previously generated and stored compensation parameters to adjust the timing of printhead ejections to improve the registration in ink images formed by the system.05-10-2012
20120113175Driving apparatus of inkjet printer head and driving method thereof - Disclosed herein is a driving apparatus for an inkjet printer head including: a controller generating and outputting pulse control signals for driving an inkjet printer head; a level switching unit operated to be switched according to the pulse control signals to output a predetermined level of switching signals; a driver selectively controlling a plurality of nozzles by using the driving waveforms generated by combining the switching signals, whereby the inkjet printer head can be implemented simpler at low cost.05-10-2012
20120236053LIQUID EJECTING APPARATUS AND LIQUID EJECTING METHOD - A liquid ejecting apparatus including, a control unit including a digital signal generation unit which generates a digital signal defining the shape of the signal waveform, an analog voltage signal generation unit which generates an analog voltage signal on the basis of the digital signal, and a current signal generation unit which generates a current signal of a magnitude corresponding to a waveform of the analog voltage signal, a head unit including, a voltage signal generation unit which generates a voltage signal by detecting a potential difference between two points which are different from each other in a path to which the current signal flows, and by amplifying the potential difference, and an element which is driven by the voltage signal, and causes liquid to be ejected from a nozzle, and a transmission unit which transmits the current signal to the head unit from the control unit.09-20-2012
20120236052IMAGE FORMING APPARATUS INCLUDING RECORDING HEAD FOR EJECTING LIQUID DROPLETS - An image forming apparatus includes a recording head and a driving waveform generator. The recording head has a nozzle, a liquid chamber, and a pressure generator. The driving waveform generator is connected to the pressure generator to generate and output a driving waveform including a plurality of driving pulses per driving cycle to eject a droplet from the nozzle. A last one of the driving pulses includes a first expansion waveform element, a first retaining waveform element, a first contraction waveform element, a second retaining waveform element, a second contraction waveform element, a third retaining waveform element, and a second expansion waveform element. The first contraction waveform element has a potential difference greater than a potential difference of the first expansion waveform element. The second contraction waveform element has a time period longer than a time period of the first contraction waveform element.09-20-2012
20090278877LIQUID EJECTING APPARTAUS AND LIQUID EJECTING METHOD - A liquid ejecting apparatus includes pressure chambers that communicate with nozzles and an element that varies liquid pressure inside the pressure chamber in accordance with variation in a potential. An ejection pulse generating unit generates a first ejection pulse applied to the element upon ejecting first liquid droplets from the nozzles and a second ejection pulse applied to the element upon ejecting subsequent, second ejection droplets. The first ejection pulse excites the liquid inside the pressure chamber to pressure vibration and then allows the element to eject liquid droplets from the nozzles when the pressure of the liquid inside the pressure chamber reaches a predetermined pressure. The second ejection pulse excites the liquid to pressure vibration and then allows the element to eject the liquid droplets from the nozzles at certain time when the pressure of the liquid becomes lower than the predetermined pressure.11-12-2009
20100207979INKJET DRIVING CIRCUIT - An inkjet driving circuit capable of controlling the amount of ink discharged from nozzles by adjusting rising and falling slopes of head driving voltage through a digital variable resistor. The inkjet driving circuit includes a digital variable resistor adjusting rising and falling slopes of a head driving voltage outputted to an output terminal, a first transistor electrically coupled between the digital variable resistor and the output terminal and operating in response to a first pulse, and a second transistor electrically coupled to the output terminal and the first transistor and operating in response to a second pulse.08-19-2010
20110279500INKJET PRINTER AND IMAGE RECORDING METHOD - In a head part of inkjet printer, a leading droplet and a following droplet are ejected from an outlet by inputting one driving signal, and the leading droplet and the following droplet land onto a recording paper. At this time, a waveform of the driving signal is set such that an average of distance from the center of a main dot element formed by the leading droplet to the farthest point in a group of dot elements formed by the leading droplet and the following droplet is equal to or more than 1.1 times an average of radius of the main dot element and equal to or less than 3.0 times the average. Therefore, the dot shape can be made noncircular, and as the result, it is possible to suppress jaggies on edges of an image on the recording paper and lowering of density in a solid area.11-17-2011
20110279501INKJET PRINTER AND IMAGE RECORDING METHOD - In recording an image by an inkjet printer, when not forming a dot on a recording paper, non-ejection operation of droplet is performed in a head part by a non-ejection pulse (P11-17-2011
20100002034METHOD OF CONTROLLING PRINTHEAD - A method is provided of controlling a printhead having nozzles which discharge ink by application of a firing pulse to respective actuators. The actuators are connected in groups to a power source which applies the firing pulses. In the method firing pulses are applied to each group of the actuators in turn to discharge ink from the nozzles in each group. The firing pulses are applied to the subsequent groups so that the fired nozzles are physically separated in the printhead as far as possible from the nozzles fired in the immediately prior group and the immediately subsequent group.01-07-2010
20100171778LIQUID EJECTING APPARATUS AND CONTROLLING METHOD OF THE SAME - A liquid ejecting apparatus includes: a liquid ejecting head which includes a pressure generating chamber communicating with a nozzle opening and a pressure generating element causing variation in a pressure of a liquid in the pressure generating chamber and which ejects the liquid from the nozzle opening by an operation of the pressure generating element; and a driving signal generating unit which generates a series of driving signals containing a driving pulse used to drive the pressure generating element. The driving pulse generated by the driving signal generating unit contains a plurality of expansion components expanding the pressure generating chamber and drawing a meniscus and an ejection component varying a voltage so as to contract the expanded pressure generating chamber and ejecting a liquid droplet. The expansion component includes a first expansion component and a second expansion component drawing the meniscus at a voltage variation ratio different from that of the first expansion component.07-08-2010
20100171777APPARATUS AND METHOD OF PROTECTING INKJET PRINTER HEAD - An apparatus and method to protect an inkjet printer head including a head controller of a printer body and a head chip to drive a heater by using a serial interface, the apparatus including: a clock monitoring unit to monitor a serial clock signal that is used as a reference clock signal supplied to the head chip to control the head chip, and if the serial clock signal is abnormal, to output a signal indicating that the serial clock signal is abnormal; and a heater driving limiting unit to limit energy applied to the heater by using the signal, which is output by the clock monitoring unit, to indicate that the serial clock signal is abnormal.07-08-2010
20100171779ACOUSTICALLY EJECTING A DROPLET OF FLUID FROM A RESERVOIR BY AN ACOUSTIC FLUID EJECTION APPARATUS - The invention provides apparatuses and methods for acoustically ejecting the fluid from a reservoir contained in or disposed on a substrate. The reservoir has a portion adapted to contain a fluid, and an acoustic radiation generator is positioned in acoustic coupling relationship to the reservoir. Acoustic radiation generated by the acoustic radiation generator is transmitted through at least the portion of the reservoir to an analyzer. The analyzer is capable of determining the energy level of the transmitted acoustic radiation and raising the energy level of subsequent pulses to a level sufficient to eject fluid droplets from the reservoir. The invention is particularly suited for delivering fluid from a plurality of reservoirs in an accurate and efficient manner.07-08-2010
20120287186FLUID DISCHARGE DEVICE, NOZZLE INSPECTION METHOD, AND MEDIUM ON WHICH NOZZLE INSPECTION PROGRAM IS RECORDED - To reduce the number of nozzles in an unstable state after a nozzle inspection, a fluid discharge device includes a discharge head capable of discharging a fluid from nozzle, a nozzle inspection process for inspecting a state of discharging of the fluid from the nozzle, and a controller for subjecting the nozzle to a pre-process for discharging the fluid under a discharge condition that a nozzle in an unstable state be put into a dot omission state, subsequently discharging the fluid for the sake of inspection, and executing an inspection process by the nozzle inspection part.11-15-2012
20120236051CAPACITIVE LOAD DRIVE CIRCUIT, FLUID EJECTION DEVICE AND MEDICAL DEVICE - Operation of a digital power amplifier for power amplification of a modulated signal is stopped in a period in which a voltage value of a drive signal applied to a capacitive load is constant, to thereby suppress power loss. The power amplification is stopped either when half a period of time when the modulated signal in a first voltage state maintains the first voltage state elapses or when half a period of time when the modulated signal in a second voltage state which is lower in voltage than the first voltage state maintains the second voltage state elapses. Accordingly, when electric current does not flow in a inductor of a low pass filter, it is possible to stop the power amplification. Thus, it is possible to prevent generation of voltage fluctuation in the drive signal due to an electromotive force caused by a self-induction phenomenon of the inductor.09-20-2012
20100188450LIQUID DROPLET EJECTION DEVICE - A liquid droplet ejection device includes a recording section, a moving section, and a driving signal supplying section. In the recording section, plural liquid droplet ejectors are arrayed, each liquid droplet ejector has a driving element, and ejects a liquid droplet onto a recording medium in response to a driving signal being supplied to the driving element. The moving section moves the recording section and the recording medium relative to one another in a direction intersecting the array direction of the liquid droplet ejectors. The driving signal supplying section generates, when plural types of liquid droplets having different droplet volumes are ejected onto the recording medium while the recording section and the recording medium are moved relatively, the driving signals such that, the smaller a droplet volume of a liquid droplet, the faster the ejection speed of the liquid droplet.07-29-2010
20120287187LIQUID EJECTION DEVICE AND LIQUID EJECTION PRINTER - A liquid ejection device includes: a drive waveform generator generating a drive waveform signal; a modulator performing pulse modulation on a signal from the drive waveform generator to provide a modulated signal; a digital power amplifier performing power amplification on the modulated signal to provide an amplified digital signal; a Lowpass Filter smoothing the amplified digital signal to provide a drive signal of an actuator; a compensator advancing the phase of the drive signal to provide a negative feedback signal; and a subtractor providing a differential signal between the drive waveform signal and the negative feedback signal as an input signal to the modulator.11-15-2012
20120105527INKJET PRINTER - A inkjet printer including a plurality of heads installed in a staggered arrangement, and a relay board for receiving image data, a control signal conforming to each head, and a timing signal for determining timed intervals to emit ink particles from the control unit of the inkjet printer, and for sending the received image data, control signal and timing signal to the aforementioned plurality of respective drive signal generating circuits.05-03-2012
20110285773LIQUID EJECTION DEVICE AND LIQUID TESTING METHOD - A liquid ejection device includes a plurality of nozzles, a plurality of piezoelectric elements, a drive signal generating portion, a selection portion and an ejection testing portion. The nozzles are arranged to eject a liquid. The piezoelectric elements are provided in respective correspondence to the nozzles. The drive signal generating portion is arranged to generate a drive signal which repeats for each of ejection cycles in which the nozzles eject the liquid onto a pixel, there being a plurality of selectable periods provided in the ejection cycles, at least one of the periods being a testing period. The selection portion is arranged to selectively apply the drive signal to the piezoelectric elements in each of the periods. The ejection testing portion is arranged to perform ejection testing of the liquid from at least one of the nozzles to be tested.11-24-2011
20110285772LIQUID EJECTION DEVICE AND LIQUID TESTING METHOD - A liquid ejection device includes a plurality of nozzles, a plurality of piezoelectric elements, a drive signal generating portion and a common ejection testing portion. The nozzles are arranged to eject a liquid. The piezoelectric elements are provided in respective correspondence to the nozzles. The drive signal generating portion is arranged to generate a drive signal which repeats for each ejection cycle in which the nozzles eject the liquid onto a pixel, the drive signal having a testing period within each ejection cycle. The common ejection testing portion is provided in common to the nozzles. One of the piezoelectric elements corresponding to the nozzle to be tested is driven within a given ejection cycle of the drive signal, whereupon the nozzle to be tested is tested by the common ejection testing portion during the testing period of the same given ejection cycle.11-24-2011
20110292108INK JET HEAD AND METHOD OF DRIVING THE SAME - According to one embodiment, an ink jet head includes pressure chambers filled with liquid, nozzles discharging the liquid that is in the pressure chambers, actuators changing the capacity of the pressure chambers, and a processor. The processor repeatedly outputs a waveform voltage including an expansion pulse, a ground potential, a contraction pulse, and a ground potential in this order, as a driving voltage with respect to the actuators.12-01-2011
20110292107PIEZOELECTRIC ACTUATOR APPARATUS AND INK-JET PRINTER - A piezoelectric actuator apparatus which is connectable to a power supply includes: a piezoelectric actuator which is provided with a plurality of piezoelectric elements each of which is sandwiched by two types of electrodes; a drive device which is connected to the power supply to drive each of the piezoelectric elements by changing a voltage between the two types of electrodes; a comparison section which compares a predetermined reference value with one of a supply voltage from the power supply to the drive device and an electric current flowing between the power supply and the drive device under the condition that the drive device applies the voltage to at least one piezoelectric element of the piezoelectric elements; and a judgement section which judges a degradation degree of dielectric strength voltage for the at least one piezoelectric element based on a comparison by the comparison section.12-01-2011
20120229543FLUID EJECTING APPARATUS - An ink temperature is calculated based on an ink viscosity. In a zone where the ink temperature is less than 15° C., a first value is set to a proportionality coefficient. In a zone where the ink temperature is equal to or higher than 15° C. and is less than 25° C., a second value is set to the proportionality coefficient. In a zone where the ink temperature is equal to or higher than 25° C. and is less than 40° C., a third value is set to the proportionality coefficient. A drive voltage for a printing head (piezoelectric elements) is set by adding a proportionality term proportional to the ink temperature by the proportionality coefficient to a reference value of the drive voltage.09-13-2012
20110134175Methods of adjusting ink ejection characteristics of inkjet printing apparatus and driving the inkjet printing apparatus - Methods of adjusting ink ejection characteristics of an inkjet printing apparatus and driving the inkjet printing apparatus are provided. A method of adjusting ink ejection characteristics of an inkjet printing apparatus may include adjusting at least one of a voltage and an application duration of a driving signal applied to a plurality of piezoelectric actuators that provide ejection pressures to a plurality of nozzles so that volumes of a plurality of ink droplets ejected from the plurality of nozzles are uniform, and displacing an application starting time of the driving signal applied to the plurality of piezoelectric actuators so that the plurality of ink droplets ejected from the plurality of nozzles reach a printing medium at a same time06-09-2011
20130215173IMAGE FORMING APPARATUS - An image forming apparatus includes: and a unit that electrically shuts off a pressure generating unit corresponding to a nozzle ejecting no droplet, from a drive waveform generating unit for a period of a time Tb satisfying a relation Tb≧T08-22-2013
20100091060Adjustable Mount Printhead Assembly - A mounting assembly for a printhead assembly is described that can allow dynamic nozzle and drop placement adjustment in one or more directions.04-15-2010
20100039465NON-CONDUCTIVE FLUID DROPLET CHARACTERIZING APPARATUS AND METHOD - A fluid droplet characterizing apparatus and method includes a pressurized source of a non-conductive fluid in fluid communication with a nozzle channel and a characterization electrode. The pressurized source is operable to form a jet of the non-conductive fluid through the nozzle channel. At least one portion of the characterization electrode is electrically conductive and contactable with first portion and thereafter a second portion of the non-conductive fluid jet. The at least one electrically conductive portion of the characterization electrode is operable to transfer a first electrical charge to a region of the first portion of the non-conductive fluid jet and transfer a second electrical charge to a region of the second portion of the non-conductive fluid jet.02-18-2010
20080309696 G OF NOZZLES OF A PRINTHEAD OF AN INKJET PRINTER - A printhead for an Inkjet Printer is disclosed. The printhead has a large number of nozzle assemblies. Each nozzle assembly has an inkjet nozzle having an actuator for ejecting an ink droplet from the inkjet nozzle when a resistive element of the actuator is heated by an electrical current, a drive transistor for providing an energy pulse to the resistive element of said actuator, and control logic for controlling said drive transistor. Nozzles are spaced from other nozzles ejecting ink of a same color by less than 25 μm in a direction transverse to the direction of movement of a print media upon which ink is ejected.12-18-2008
20090295854FLUID EJECTING APPARATUS - A fluid ejecting apparatus that ejects fluid includes a control unit that generates a drive pulse and a temperature detection unit that detects at least one of an environment temperature and a temperature of a fluid ejecting head. The control unit is able to generate a maintenance drive pulse for ejecting a bubble together with the fluid from a pressure chamber. The maintenance drive pulse includes a first pulse portion that cause the pressure chamber to expand into an expanded state, a second pulse portion that causes the pressure chamber to contract from the expanded state, and an intermediate pulse portion placed between the first pulse portion and the second pulse portion for holding the expanded state of the pressure chamber. The control unit adjusts the width of the intermediate pulse portion on the basis of the temperature detected by the temperature detection unit.12-03-2009
20110128316LIQUID DROP EJECTION USING DUAL FEED EJECTOR - A liquid ejector is provided that includes a structure defining a plurality of chambers with one of the plurality of chambers including a first surface and a second surface. The first surface includes a nozzle orifice. A drop forming mechanism is located on the second surface of the chamber opposite the nozzle orifice. A first liquid feed channel and a second liquid feed channel are in fluid communication with the chamber. A first segment of a segmented liquid inlet is in fluid communication with the first liquid feed channel and a second segment of the segmented liquid inlet is in fluid communication with the second liquid feed channel. The first segment of the segmented liquid inlet is also in fluid communication with another one of the plurality of chambers and the second segment of the liquid inlet is also in fluid communication with another one of the plurality of chambers. A liquid is provided to the chamber through the first liquid feed channel and the second liquid feed channel from the segmented liquid inlet. A drop of the liquid is ejected through the nozzle orifice of the chamber by operating the associated drop forming mechanism.06-02-2011
20100110125IMPROVEMENTS IN OR RELATING TO MARKING AND/OR CODING - The invention provides a marking and/or coding apparatus which allows print resolution to be adjusted by multiplying or dividing encoder inputs generated from a conveyor on which goods to be coded or marked are transported to a marking station.05-06-2010
20100002035Printhead IC With Non-Ejection Maintenance - A printhead IC is provided having an ejection nozzle having a heater for heating printing fluid, and drive circuitry for generating print pulses and maintenance pulses for driving the heater of the ejection nozzle. The maintenance pulses have a series of sub-ejection pulses preceding a de-clog pulse. The print signals are generated to heat the heater to form a first vapor bubble in printing fluid that causes ejection of the printing fluid from the nozzle. The de-clog pulse is generated to have lower power and longer duration than the print pulses so as to heat the heaters to form a second vapor bubble in the printing fluid which does not cause ejection. The sub-ejection pulses are generated to have lower power than the print pulses and shorter duration than the de-clog pulse so as to heat the heater without sufficient energy to nucleate a vapor bubble in the printing fluid.01-07-2010
20090147034LIQUID DISCHARGE APPARATUS AND IMAGE FORMING APPARATUS - A liquid discharge apparatus is disclosed that includes a liquid discharge head that discharges plural types of liquid droplets; a drive waveform generating unit that generates and outputs a drive waveform including a first drive signal group made up of one or more drive signals and a second drive signal group made up of one or more drive signals within one drive period; a control signal output unit that outputs first control signals for controlling selection of the drive signals of the first drive signal group and second control signals for controlling selection of the drive signals of the second drive signal group; and a drive unit that inputs the drive waveform, the first control signals, and the second control signals, selects one or more drive signals from the drive signals of the first drive signal group and the second drive signal group using the first control signals and the second control signals, and supplies the selected drive signals to the liquid discharge head.06-11-2009
20080266338Method of driving an ink-jet head, ink-jet head, and ink-jet recording apparatus - Provided is an ink-jet head and an ink-jet type recording apparatus for improving an impact position accuracy of ink droplets by eliminating a discharge speed difference of ink droplets when an ink volume is changed gradually in a plurality of steps to perform gradation expression. Among discharge pulse signals to be applied a plurality of times for gradually changing and discharging the ink droplet volume, a signal waveform of a final drive pulse and a signal waveform of an initial drive pulse to be operated at least once before the final drive pulse, are varied from each other so as to establish a predetermined relation therebetween.10-30-2008
20090309908Method for Producing Ultra-Small Drops - Apparatus and methods for producing a drop from a Drop on demand (DOD) dispenser, the drop having a radius that is much smaller than the radius of the nozzle that expels the drop. Generally, the Ohnesorge number is less than about 0.1. Various embodiments of the invention are found within a four dimensional space defined in terms of the Ohnesorge number, the Weber number, the actuation frequency, and the initial conditions.12-17-2009
20100315455PRINTHEAD SUBSTRATE, INKJET PRINTHEAD, AND INKJET PRINTING APPARATUS - A detector circuit for detecting a malfunction of a circuit due to a low third power supply voltage that has the same amplitude and potential as an input signal is provided. Based on an output signal of the detector circuit, whether an output of a second power supply voltage generation circuit for activating a heater driving circuit is allowed or not is determined. When the third power supply voltage is low and the heater driving circuit operates improperly, no power supply voltage is supplied from the second power supply voltage generation circuit. Since no power supply voltage is supplied to the heater driving circuit, the heater driving circuit does not drive a corresponding heater.12-16-2010
20100118075FLUID EJECTING APPARATUS AND FLUID EJECTING METHOD - A fluid ejecting apparatus includes a drive element that performs a driving operation when a drive waveform is applied thereto and causes a nozzle to eject fluid. A drive signal generating unit generates a first drive signal having a first drive waveform at a front section of a predetermined period and a second drive waveform at a rear section thereof. A second drive signal has a third drive waveform at a front section of the predetermined period and a fourth drive waveform at a rear section thereof. A control unit applies the first drive waveform to the drive element, which then performs a first operation, applies the fourth drive waveform to the drive element, which then performs a second operation, and applies the second drive waveform to the drive element after applying the third drive waveform thereto, so that the drive element performs a third operation.05-13-2010
20100118073INKJET RECORDING APPARATUS - An inkjet recording apparatus including: a recording head having a pressure chamber, and a pressure generation device to change a volume of the pressure chamber, wherein the recording head ejects an ink in the pressure chamber as an ink droplet from a nozzle by driving the pressure generation device based on drive signals; and a drive signal generating section to generate the drive signals, which include: an ejection pulse including a first pulse for expanding the volume of the pressure chamber and then contracting the volume; a preliminary pulse, to be applied immediately before the first pulse, for contracting the volume of the pressure chamber and then expanding the volume, and wherein the preliminary pulse is a rectangular wave having a pulse width of 2 AL or greater, where AL is ½ of an acoustic resonance cycle period of a pressure wave in the pressure chamber.05-13-2010
20090213153LIQUID JET APPARATUS - A liquid jet apparatus according to the invention is a liquid jet apparatus adapted to emit a jet of a liquid by driving an actuator of a liquid jet head with a drive signal including a digital power amplifier and a low pass filter provided to the liquid jet head so as to correspond to the actuator, and adapted to power-amplify and smooth a modified signal from a control circuit to form the drive signal.08-27-2009
20120293576DEVICE AND METHOD FOR MANAGING PIEZO INKJET HEAD - A device and a method for managing a piezo inkjet head. The device includes: a piezo actuator connected to an inkjet head to generate pressure; a driver that controls driving of the piezo actuator; a sensing resistor connected between the driver and the piezo actuator, a signal amplifier connected across the sensing resistor to amplify the signal applied to the sensing resistor; a signal processor that removes noise of the signal output from the signal amplifier; a controller that determines a signal passing through the signal processor as a reference signal in a state in which bubbles are not introduced into the inkjet head; and a storage unit that stores the signal determined as the reference signal in the controller. The controller calculates a difference between the signal passing through the signal processor and the reference signal to generate a detection signal and determine a state of the inkjet head.11-22-2012
20100079519Liquid Droplet Jetting Apparatus - A liquid droplet jetting apparatus includes a nozzle which jet the liquid droplets in a plurality of types of jetting modes; a liquid droplet jetting head which has the nozzles; a signal generating section which generates a plurality of types of jetting signals, each of which is formed of bit data, has predetermined bits not less than three bits, and corresponds to one of the plurality of types of jetting modes; and a signal supply section which outputs serially the bit data forming one of the jetting signals to the liquid droplet jetting head at each of jetting timings of the nozzle. The jetting signals are set such that the jetting signals corresponding to the jetting modes respectively are subjected to binary switching of the bit data at frequencies decreasing proportional to usage frequencies of the jetting modes when the bit data are outputted serially from the signal supply section.04-01-2010
20100091059LIQUID JET APPARATUS AND PRINTING APPARATUS - A liquid jet apparatus according to the present invention includes a plurality of nozzles, an actuator provided for each nozzle and connected to the respective nozzle, and a drive unit for applying a drive signal to the actuator. The drive unit includes a drive waveform generator that generates a drive waveform signal for controlling the drive of the actuator, a modulator for performing a pulse modulation of the drive waveform signal to produce a modulated signal, a digital power amplifier for power amplifying the modulated signal to produce an amplified signal, a low-pass filter for smoothing the amplified signal and supplying the drive signal to the actuator, and a modulation signal correcting unit that corrects the modulated signal according to a power supply voltage of the digital power amplifier.04-15-2010
20090160891CAPACITIVE LOAD DRIVING CIRCUIT AND DROPLET EJECTION APPARATUS - A capacitive load driving circuit includes: a phase lead compensator, advancing a phase of an output signal of a filter; a series compensator, determining an error between a driving signal and an output signal of the phase lead compensator; a stabilization compensator, performing a derivative action on an output signal of the filter; a voltage comparison unit, comparing a differential voltage between a signal output from the series compensator and a signal output from the stabilization compensator, with a voltage of a predetermined triangular waveform, and outputting a pulse width modulation signal; a voltage amplification unit, amplifying the voltage of the pulse width modulation signal output, and supplying the amplified pulse width modulation signal to the input terminal of the filter; and plural capacitive loads each connected in parallel to the capacitor. A droplet ejection apparatus includes the capacitive load driving circuit.06-25-2009
20080316240METHOD OF CONTROLLING A CONTROL CIRCUIT FOR A MICRO-ELECTROMECHANICAL INKJET NOZZLE ARRANGEMENT - Provided is a method of controlling a CMOS-implemented control circuit for operating a micro-electromechanical inkjet nozzle arrangement of a printer. The circuit includes a plurality of sequential shift registers, a transfer register, a firing control gate and a drive transistor. The method includes the steps of transferring data from the shift register to the transfer register, latching the data in said transfer register, activating the firing control gate to arrange a heater element of the nozzle arrangement in electrical communication with a current source to facilitate ink ejection via thermal cavitation of ink in the nozzle.12-25-2008
20090278875Jetting Apparatus and Method of Improving the Performance of a Jetting Apparatus - The present invention is generally related to a jetting device for jetting droplets of viscous medium onto a substrate, said jetting device comprising an ejector element for performing the jetting process and a jetting outlet through which said droplets are jetted. In particular, the invention is related to a method, a measuring device, a jetting device, and a viscous medium container for use in such a jetting device for measuring or monitoring a level or volume of viscous medium during a jetting process and/or measuring electrical properties of the viscous medium to determine characteristics of the medium.11-12-2009
20110169885PRECURSOR PULSE GENERATION FOR INKJET PRINTHEAD - The present invention is embodied in a printing system (07-14-2011
20100265289Methods of driving an inkjet printing apparatus - A method of driving a hybrid type inkjet printing apparatus according to example embodiments may use both a piezoelectric method and an electrostatic method. The method of driving may include a plurality of driving modes that are determined by adjusting the order, amplitude, and duration of a piezoelectric driving voltage to a piezoelectric actuator and an electrostatic driving voltage to an electrostatic force applying unit. As a result, ink droplets may be ejected in various sizes and shapes. In a first driving mode, a dome-shaped ink meniscus may be formed at an end portion of a nozzle and ink droplets having a smaller size than the nozzle may be ejected from a surface of the dome-shaped ink meniscus. In a second driving mode, a cone-shaped ink meniscus may be formed at an end of the nozzle, and ink droplets having a smaller size than those of the first driving mode may be ejected from a sharp end portion of the cone-shaped ink meniscus. In a third driving mode, a syringe/cone-shaped ink meniscus may be formed at an end portion of the nozzle and ink in the form of an ink stream may be ejected from a sharp end portion of the syringe/cone-shaped ink meniscus.10-21-2010
20080211845Method for Driving Piezoelectric Ink Jet Head - The present invention provides a method for driving a piezoelectric ink jet head that surely suppresses the ensuing vibration of the drive section while suppressing the flying speed of the ink droplet from decreasing, by setting the time constant τ09-04-2008
20090289979Inkjet Printhead With Drive Circuitry Controlling Variable Firing Sequences - An inkjet printhead comprises: an array of ink ejection nozzles, an actuator for each nozzle and drive circuitry for receiving print data from a printhead controller and distributing fire signals to the actuators. The drive circuitry is configured to fire the actuators such that a first firing sequence for a first line of print is different to a second firing sequence for a subsequent second line of print.11-26-2009
20090289978METHOD AND APPARATUS TO PROVIDE VARIABLE DROP SIZE EJECTION WITH LOW TAIL MASS DROPS - Described herein is a method and apparatus for driving a drop ejection device to produce variable sized drops with multi-pulse waveforms. In one embodiment, a method for driving a drop ejection device having an actuator includes applying a multi-pulse waveform having at least one drive pulse and at least one break off pulse to the actuator. The method further includes building a drop of a fluid with the at least one drive pulse. The method further includes accelerating the break off of the drop with the at least one break off pulse. The method further includes causing the drop ejection device to eject the drop of a fluid in response to the pulses of the multi-pulse waveform. The break off pulse causes the break off of the drop formed by the at least one drive pulse in order to reduce the tail mass of the drop.11-26-2009
20090278876SHORT PULSEWIDTH ACTUATION OF THERMAL BEND ACTUATOR - A method of actuating a thermal bend actuator having an active beam fused to a passive beam. The method comprises passing an electrical current through the active beam so as to cause thermoelastic expansion of the active beam relative to the passive beam and bending of the actuator. The current is delivered in an actuation pulse having a pulse width of less than 0.2 microseconds.11-12-2009
20090289975IMAGE FORMING DEVICE AND PRINTED MATTER - In an image forming device including a liquid discharge head in which nozzles for discharging liquid drops are arranged side by side, a drive waveform generating unit generates, within a single drive cycle, a first drive waveform containing a drive signal to discharge an amount of liquid drop used for image formation, and a second drive waveform containing a drive signal to discharge an amount of liquid drop smaller than a minimum discharge drop amount used for image formation. A head control unit causes the liquid discharge head to discharge the amount of liquid drop used for image formation in accordance with the first drive waveform for a region where an image is formed, and to discharge the amount of liquid drop smaller than the minimum discharge drop amount in accordance with the second drive waveform for a region where any image is not formed.11-26-2009
20120086748PRINTHEAD HAVING MIRRORED ROWS OF PRINT NOZZLES - A printhead having at least first and second rows of print nozzle cells. Each each nozzle cell has an ink chamber, control circuitry and drive circuitry. Each nozzle cell in the first row has a corresponding nozzle cell in the second row. The drive circuitry of each nozzle cell of the first row is arranged adjacent the drive circuitry of the corresponding nozzle cell in the second row and distant the control circuitry of the corresponding nozzle cell in the first row.04-12-2012
20090289977LIQUID DELIVERY DEVICE, ELECTRICAL CIRCUIT, AND LIQUID JETTING SYSTEM - The liquid delivery device adapted for installation in a liquid jetting device that has a number N of liquid receiving portions, where N is an integer equal to 2 or greater, comprises an electrical device that returns a response signal in response to a driving signal from the liquid jetting device; a number N of liquid delivery portions that deliver liquid to the liquid receiving portions; and a number N of sets of terminals provided in correspondence with the liquid delivery portions; wherein the electrical device receives the driving signal and transmits the response signal, via one set of terminals among a number M of sets of terminals among the N sets of terminals, where M is an integer equal to 2 or greater but not greater than N.11-26-2009
20090289976Ink jet printer having ink maintenance system - An ink jet printer performs a print process by ejecting ink for each of a plurality of ink colors. When a predetermined first circulation time elapses after starting the ink circulation, an ink agitating operation drive signal generation unit applies an ink agitating operation drive signal to an ink ejecting unit set operable to eject an ink, which has a predetermined nature, for a first ink agitating operation time in a first period, and applies the ink agitating operation drive signal to an ink ejecting unit set operable to eject an ink, which has not the predetermined nature, for a second ink agitating operation time in a second period which is shorter than the first period. It is therefore possible to perform maintenance effectively in advance of starting the print process in accordance with the nature of ink.11-26-2009
20090295853FLUID EJECTING APPARATUS - A fluid ejecting apparatus that ejects fluid includes: a pressure chamber that is filled with the fluid; a pressure generating element that deforms a wall face of the pressure chamber to change a volume of the pressure chamber; a nozzle that is in fluid communication with the pressure chamber and that is used for ejecting the fluid; and a control unit that generates a drive pulse for controlling the pressure generating element. The control unit is able to generate a maintenance drive pulse for ejecting a bubble together with the fluid from the pressure chamber. The maintenance drive pulse includes a first pulse portion that drives the pressure generating element to cause the pressure chamber to expand into an expanded state and a second pulse portion that causes the pressure chamber to contract from the expanded state. The width of the second pulse portion is equal to or smaller than half the Helmholtz resonance period of the fluid with which the pressure chamber is filled.12-03-2009
20100201729Inkjet printer - The invention describes an inkjet printer with a printing bed for displacing a print medium in a forward feed direction and a print head carriage disposed above the printing bed for displacing at least one print head unit in a transverse feed direction, a print head unit with at least one print head being provided for every colour to be printed, each print head having at least one nozzle row oriented in the forward feed direction of the print medium. The nozzles of the at least one nozzle row of the print head unit are disposed offset from one another by a nozzle distance D by reference to the forward feed direction. Another print head unit is provided, which has nozzles in at least one nozzle row disposed offset from one another by a second nozzle distance d by reference to the forward feed direction of the print medium, the ratio derived from the nozzle distance D and the second nozzle distance d being a rational number and greater than 1.08-12-2010
20100201727Universal Inkjet Printer Device and Methods - A signal converter that may perform functions to enable a thermally based technology to be used with a piezo-electric printhead. The signal converter and piezo-electric printhead may optionally be used in conjunction with a chassis assembly having an adjustable vertical member for sizing the chassis assembly to a printer. Methods of using a piezo-electric printhead in a printer having a thermal printhead configuration may include the steps of coupling the printhead to the printer and performing conversion functions.08-12-2010
20100201728PRINTING NOZZLE HAVING FAULT SENSOR - A printing nozzle is provided having a chamber defined over a fluid inlet in a substrate and having a fluid ejection port, an actuator for causing ejection of fluid within the chamber from the fluid ejection port, a controller for controlling operation of the actuator by applying a current pulse having a predetermined energy level to the actuator, and a sensor for sensing operation of the actuator. The controller applies a current pulse having an energy level significantly greater than said predetermined energy level to the actuator when the sensor senses faulty operation of the actuator.08-12-2010
20100201726FLUID EJECTING APPARATUS AND MANUFACTURING METHOD OF FLUID EJECTING APPARATUS - A manufacturing method of a fluid ejecting apparatus includes: forming first and second test patterns by ejecting fluid from first and second nozzle rows which intersect with a relative movement direction of a medium, wherein the first nozzle row forms the first test pattern by ejecting the fluid in accordance with a first driving pulse and the second nozzle row forms the second test pattern by ejecting the fluid in accordance with a second driving pulse; measuring the density of the first test pattern and the density of the second test pattern; and correcting a parameter of the first driving pulse and a parameter of the second driving pulse such that the density of the first test pattern and the density of the second test pattern become a common target density.08-12-2010
20100201725DRIVING WAVEFORM FOR DROP MASS AND POSITION - A drop emitting device that includes a drop generator, a drive signal including a plurality of fire intervals applied to the drop generator, wherein the drive signal includes in each fire interval a bi-polar drop firing waveform or a non-firing waveform.08-12-2010
20110221809LIQUID EJECTING APPARATUS AND CONTROL METHOD THEREOF - A resonance pulse is a voltage waveform substantially containing an expansion element for varying a voltage to expand a pressure chamber, an expansion sustaining element generated following with the expansion element, and sustaining a maximum voltage at a predetermined value, and a contraction element generated following with the expansion sustaining element, and varying the voltage to contract the pressure chamber. A time span from a front end of the expansion element to a front end of the contraction element is set as ½ of an inherent vibration cycle of ink in the pressure chamber.09-15-2011
20110205273DROPLET EJECTING DEVICE CAPABLE OF MAINTAINING RECORDING QUALITY WHILE SUPPRESSING DETERIORATION OF ACTUATOR - First and second piezoelectric layers are stacked from a side closer to an opening of a liquid channel formed in a channel member in this order, and are sandwiched between electrodes with respect to a stacking direction. A driving-signal generating section generates an ejection driving signal for ejecting droplets from an ejection port and a non-ejection driving signal for vibrating a meniscus formed in the ejection port without ejecting droplets from the ejection port. A voltage applying section applies, based on image data, a voltage corresponding to the ejection driving signal to one of the first and second piezoelectric layers, and applies a voltage corresponding to the non-ejection driving signal to another one of the first and second piezoelectric layers during a period in which the voltage corresponding to the ejection driving signal is not applied to the one of the first and second piezoelectric layers.08-25-2011
20110205274METHOD OF DRIVING LIQUID EJECTION HEAD AND DRIVE SIGNAL GENERATION DEVICE FOR LIQUID EJECTION HEAD - A method of driving a liquid ejection head adapted to apply a voltage to the liquid ejection head to eject a liquid including a polymer is provided. The method includes raising the voltage from a first voltage to a second voltage; raising the voltage from the second voltage to a third voltage at a gradient larger than that in raising the voltage from the first to the second voltage, and then holding the voltage at the third voltage; dropping the voltage from the third voltage to a fourth voltage, and then holding the voltage at the fourth voltage; raising the voltage from the fourth voltage to a fifth voltage, and then holding the voltage at the fifth voltage; dropping the voltage from the fifth voltage to a sixth voltage, and then holding the voltage at the sixth voltage; and raising the voltage from the sixth voltage to a seventh voltage.08-25-2011
20100103212FLUID EJECTION DEVICE - A fluid ejection device configured to eject fluid from an ejection port includes a driving element that pressurizes the fluid and causes it to be ejected from the ejection port by being driven according to a voltage applied thereto. A driving voltage waveform selecting unit selects a driving voltage waveform to be applied to the driving element from among a plurality of types of the stored driving voltage waveforms. Power sources set the voltage to be outputted. A power source voltage determining unit determines voltages to be set to the power sources on the basis of the selected driving voltage waveform. A driving voltage waveform applying unit applies the selected driving voltage waveform to the driving element by setting the determined voltages to the power sources and connecting the power sources to the driving element while switching the same.04-29-2010
20100103211DRIVING CIRCUIT FOR FLUID JET HEAD, DRIVING METHOD FOR FLUID JET HEAD, AND FLUID JET PRINTING APPARATUS - An ejection head driving circuit that supplies a driving voltage waveform to an ejection head has ejection nozzles that cause fluid to be ejected. A target voltage waveform output unit outputs a target voltage waveform to the ejection head. Power source units generate electric power at different voltage values. Negative feedback control units supply electric power from the respective power source units to the ejection head and perform a negative feedback control of the voltage values so that the voltage value to be applied to the ejection head matches the target voltage waveform. A power source connecting unit selects one of the power source units on the basis of the voltage value applied to the ejection head or the voltage value of the target voltage waveform, connects the selected power source unit to the ejection head, and disconnects the remaining power source units from the ejection head.04-29-2010
20080238964DRIVE SIGNAL GENERATING APPARATUS, LIQUID EJECTING APPARATUS, AND DRIVE SIGNAL GENERATING METHOD - A drive signal generating apparatus is provided with an analog signal converting section, a current amplification section, and a power source generating section. The analog signal converting section converts digital data to an analog signal. The current amplification section is provided with a current amplification transistor and generates a drive signal by amplifying a current of the analog signal using the current amplification transistor. The power source generating section is a power source having a voltage determined based on the digital data and generates a power source to be supplied to the current amplification transistor.10-02-2008
20080238965INK JET PRINTING APPARATUS AND INK JET PRINTING METHOD - The present invention provides an ink jet printing apparatus and an ink jet printing method which are capable of stabilizing the amount of ink ejection and of printing a high-definition image by selecting a driving condition with heat conductivity of an electrothermal converter being taken into consideration. The heat conductivity from a heater to ink is classified into heater ranks, and, on the basis of the heater rank, a voltage of a drive pulse to be applied to the heater is changed.10-02-2008
20080238963DRIVING DEVICE FOR RECORDING HEAD, IMAGE RECORDING APPARATUS, AND DRIVING METHOD FOR RECORDING HEAD - The driving device of a recording head having a recording element, the driving device includes: a power supply device which supplies voltage to be applied to the recording element; an output circuit block which converts the voltage supplied from the power supply device into a drive voltage having a prescribed waveform, the output circuit block having a structure in which a plurality of drive circuit units are connected in parallel to the recording element; a recording data integration device which determines an integrated value of a number of recording actions of the recording element according to recording data; and a drive circuit unit selection device which selects at least one of the drive circuit units in accordance with the integrated value determined by the recording data integration device, in such a manner that an on-resistance value of the output circuit block is kept within a prescribed value.10-02-2008
20090167798LIQUID JET APPARATUS - A liquid jet apparatus according to the present invention includes a drive waveform generator adapted to generate a drive waveform signal, a modulator adapted to execute pulse modulation on the drive waveform signal, a digital power amplifier adapted to power-amplify the modulated signal, on which the pulse modulation is executed by the modulator, with a pair of switching elements push-pull coupled with each other, a lowpass filter adapted to smooth the amplified digital signal obtained by the power-amplification of the digital power amplifier, and a modulation period modification circuit adapted to modify a modulation period of the pulse modulation of the modulator based on data of the drive waveform signal.07-02-2009
20080231648PRINTER - A printer includes a first transporting belt that transports a print medium and a second transporting belt that receives the print medium from the first transporting belt and further transports the print medium. A liquid ejection head ejects liquid according to a liquid-ejection timing signal to the print medium transported by the first transporting belt and the second transporting belt. A signal generator outputs the liquid-ejection timing signal according to a first signal and a second signal that correspond to the travel of the first and second transporting belts, respectively. When the phase difference between the first and second signals has a predetermined threshold value or less, the signal generator switches from outputting the liquid-ejection timing signal according to the first signal to outputting the liquid-ejection timing signal according to the second signal.09-25-2008
20120293577LIQUID EJECTION APPARATUS AND EJECTION CONTROL METHOD FOR SAME, AND INKJET APPARATUS - A liquid ejection apparatus includes: a circuit control device including switches of which first ends are connected to pressure generating elements; a voltage waveform generating device configured to generate a voltage waveform to be supplied to second ends of the switches; and a switch control device which causes the switches to close and open. The voltage waveform has a waveform such that, when the switch is caused to close and open so that a portion of the voltage waveform is applied to the pressure generating element, a droplet is ejected from a nozzle corresponding to the pressure generating element to which the portion of the voltage waveform has been applied, whereas when a whole of the voltage waveform is applied to the pressure generating element, no droplet is substantially ejected from the nozzle corresponding to the pressure generating element to which the whole of the voltage waveform has been applied.11-22-2012
20080309694APERTURE OF A NOZZLE ASSEMBLY OF AN INKJET PRINTER - A nozzle assembly for an inkjet printhead is disclosed. The nozzle assembly includes an inkjet nozzle having an actuator for ejecting an ink droplet from the inkjet nozzle when a resistive element of the actuator is heated by an electrical current. A drive transistor provides an energy pulse to the resistive element of the actuator, and control logic controls the drive transistor. The aperture of the inkjet nozzle through which the ink droplet is ejected has a diameter of less than 15 μm.12-18-2008
20080309695NOZZLE ASSEMBLY FOR AN INKJET PRINTER HAVING A SHORT DRIVE TRANSISTOR CHANNEL - A nozzle assembly for an inkjet printhead is disclosed. The nozzle assembly includes an inkjet nozzle having an actuator for ejecting an ink droplet from the inkjet nozzle when a resistive element of the actuator is heated by an electrical current. A drive transistor provides an energy pulse to the resistive element of the actuator, and control logic controls the drive transistor. The channel length of the drive transistor is less than 1 μm.12-18-2008
20080211846SETTING METHOD AND IMAGE FORMING APPARATUS - A method is provided for setting a target moving velocity of a carriage in an image forming apparatus wherein a recording head is driven at a driving frequency proportional to a moving velocity of the carriage. The method includes steps of: varying the driving frequency of the recording head proportional to the moving velocity of the carriage so as to measure an ejection velocity of ink droplets ejected from nozzles of the recording head; deriving a velocity range where the ejection velocity of ink droplets from the nozzles of the recording head is increased as the moving velocity of the carriage is increased; calculating a control error between the target moving velocity and an actual moving velocity of the carriage; and setting the target moving velocity of the carriage such that the actual moving velocity of the carriage is within the velocity range based on the calculated control error.09-04-2008
20080309692ELEMENT SUBSTRATE, PRINTHEAD, HEAD CARTRIDGE, AND PRINTING APPARATUS - The present invention prevents an element substrate from not operating normally in the case where the voltage supply from a power supply that applies a voltage to a logic circuit is unstable. The element substrate of the invention has unit for applying a first voltage to the logic circuit, and unit capable of applying a second voltage that is lower than the first voltage and capable of operating the logic circuit.12-18-2008
20120062631RECORDING HEAD DRIVING METHOD AND RECORDING APPARATUS - A recording head includes electrothermal transducers associated with temperature sensing elements. A method for driving the recording head includes supplying driving energy to the electrothermal transducer, and evaluating a temperature change in a temperature fall interval, occurring after supplying of driving energy to the electrothermal transducer, based on temperature information acquired from the temperature sensing element. The method further includes changing a setting value of the driving energy supplied to the electrothermal transducer, determining an energy value for driving the electrothermal transducer based on the evaluated temperature change and an energy value supplied to the electrothermal conversion element, and recording data on a recording medium by driving the electrothermal transducer according to the determined energy value.03-15-2012
20090160892HEAD ELEMENT SUBSTRATE, RECORDING HEAD, AND RECORDING APPARATUS - A head element substrate includes receiving means for receiving data in which recording data and drive pulse width data have been multiplexed, a shift register which separates recording data from the multiplexed data, and a drive pulse width signal generation circuit which generates a drive pulse width signal by separating the drive pulse width data from the multiplexed data.06-25-2009
20090085945INK-JET RECORDING APPARATUS - An ink-jet recording apparatus, including: a flow-passage unit; a plurality of actuators; a plurality of signal output circuits which are provided so as to respectively correspond to the actuators; at least one power supply device; at least one electric current detecting device; and a control device including (a) a startup charging portion which controls the signal output circuits, upon startup of the apparatus, such that all of the actuators are placed into a charged state from a discharged state in order at least one by one, when all of the actuators are in the discharged state and (b) a power-supply inhibiting portion which inhibits electric power supply from the at least one power supply device when the electric current detected by any of the at least one electric current detecting device is equal to or larger than a threshold during execution of a control by the startup charging portion.04-02-2009
20120069070DRIVING APPARATUS AND DRIVING METHOD FOR INKJET HEAD - According to one embodiment, a driving apparatus configured to drive an inkjet head configured to cause plural nozzles to discharge ink according to deformation of an electromechanical energy converting element includes: a signal generating unit configured to generate a driving signal to be applied to the electromechanical energy converting element; and a setting unit configured to set, with respect to a reference waveform, a delay time of a waveform of the driving signal in the nozzles by using a random number generated by a random number generator.03-22-2012
20090244133Signal processing apparatus, droplet ejection apparatus and signal processing method - A signal processing apparatus has a first circuit board having a digital/analog converter, a second circuit board having an operational amplifier, a connector connecting the first circuit board and the second circuit board, a transmitter on the first circuit board, and a controller on the second circuit board. The digital/analog converter converts, to an analog signal, a digital signal as a reference of a voltage to be applied to a capacitive load and outputs the analog signal. The operational amplifier is connected to the capacitive load at an output terminal thereof via a switching element, and amplifies the voltage of the analog signal to output. The transmitter transmits a predetermined signal to the second circuit board via the connector. The controller prevents the voltage of the analog signal from being applied to the capacitive load when the predetermined signal is not received in the second circuit board.10-01-2009
20090213152LIQUID JET APPARATUS - A liquid jet apparatus according to the invention is a liquid jet apparatus adapted to emit a jet of a liquid by driving an actuator of a liquid jet head with a drive signal including a digital power amplifier and a low pass filter provided to the liquid jet head so as to correspond to the actuator, and adapted to power-amplify and smooth a modified signal from a control circuit to form the drive signal, wherein the low pass filter is coupled directly with the actuator, and the digital power amplifier is provided with a pair of switching elements and a gate drive circuit, and ON-OFF controls the gate drive circuit based on print data, thereby performing one of output and halt of the drive signal.08-27-2009
20090244135LIQUID EJECTING APPARATUS AND METHOD OF DRIVING LIQUID EJECTING HEAD - Provided is a liquid ejecting apparatus including: pressure generation chambers communicating with nozzle openings for ejecting a liquid; and a liquid ejecting head including pressure generation units which cause pressure variations in the pressure generation chambers, wherein idle nozzles including at least one located adjacent to ejection nozzles in the vicinity of the ejection nozzles are selected according to a liquid ejecting timing from the ejection nozzles for ejecting the liquid from the nozzle openings, the pressure generation unit corresponding to the selected idle nozzles is driven, non-ejection driving for pressurizing the pressure generation chamber communicating with the idle nozzles to a degree not ejecting the liquid is performed, and the non-ejection driving is not performed with respect to the pressure generation unit corresponding to the unselected idle nozzles.10-01-2009
20090244132Fluid Ejection Device - A fluid ejection device includes groups of firing cells, sharing a common fire signal and a common address selection mechanism, each firing cell having a drop generator for ejecting fluid and a dynamic memory addressable by the common address selection mechanism. Circuitry interfaces with the firing cells to allow the capture of data during two consecutive select cycles, then firing of all cells during a third cycle.10-01-2009
20110109674LIQUID EJECTION DEVICE AND LIQUID EJECTION PRINTER - A liquid ejection device includes: a drive waveform generator generating a drive waveform signal; a modulator performing pulse modulation on a signal from the drive waveform generator to provide a modulated signal; a digital power amplifier performing power amplification on the modulated signal to provide an amplified digital signal; a Lowpass Filter smoothing the amplified digital signal to provide a drive signal of an actuator; a compensator advancing the phase of the drive signal to provide a negative feedback signal; and a subtractor providing a differential signal between the drive waveform signal and the negative feedback signal as an input signal to the modulator.05-12-2011
20090315931FLUID EJECTION DEVICE WITH DATA SIGNAL LATCH CIRCUITRY - A fluid ejection device includes a plurality of firing cells and a fire line adapted to conduct an energy signal including energy pulses. Each firing cell in the plurality of firing cells includes a firing resistor, a drive switch, a first data switch, and a second data switch. The drive switch is configured to enable the firing resistor to respond to the energy signal. The first data switch is configured to receive data signals that represent an image and to latch the data signals to provide latched data signals. The second data switch is configured to receive the latched data signals and control the drive switch to enable the firing resistor to respond to the energy signal and heat fluid to be ejected based on the latched data signals.12-24-2009
20090273626INKJET RECORDING HEAD AND RECORDING APPARATUS - An inkjet recording head includes a connection-state output circuit provided on the recording element substrate of a recording head, where the connection-state output circuit externally transmits data of the connection state of each of input signal ends. An output from the connection-state output circuit is activated when the same logic as that used when signals are pulled up and/or pulled down is used.11-05-2009
20090273625LIQUID JET APPARATUS AND PRINTING APPARATUS - A liquid jet apparatus according to the present invention includes a drive circuit adapted to apply a drive signal to an actuator of a liquid jet head, and a power supply voltage control circuit adapted to control a power supply voltage to the drive signal to be a waveform voltage set previously based on a reference signal obtained from one of the drive signal and a signal in a generation stage of the drive signal.11-05-2009
20100149238THERMAL CLEANING OF INDIVIDUAL JETTING MODULE NOZZLES - A liquid ejection device includes a jetting module including an array of nozzles; a thermal stimulation device associated with each nozzle of the array of nozzles; and a controller in electrical communication with each thermal stimulation device. The controller is configured to provide a first activation waveform to each thermal stimulation device and to provide a second activation waveform to each thermal stimulation device to clean the associated nozzle with liquid emitted from the associated nozzle. The second activation waveform has a higher activation component when compared to the first activation waveform.06-17-2010
20100156973PRINTING APPARATUS AND PRINTING METHOD - The present invention has an object to provide an inkjet printing apparatus that can realize both high quality image formation and improvement of a device life caused by the reduction of a mist amount of a processing liquid. The present invention is provided with a control unit that can independently control an ink ejection condition in an ink ejection unit and a processing-liquid ejection condition in a processing-liquid ejection unit. The control unit controls the ejection condition in each ejection unit so that the mist amount of the processing liquid ejected from the processing-liquid eject unit is smaller than that of the ink ejected from the ink eject unit.06-24-2010
20090079772METHOD FOR OBTAINING AN IMAGE WITH AN INK JET PRINTER AND A PRINTER SUITABLE FOR PERFORMING THAT METHOD - A method obtains an image from multiple ink droplets transferred to a receiving substrate using an ink jet printer including a plurality of ink chambers operatively filled with ink. Each ink chamber has a nozzle and a corresponding transducer. The ink chambers have mutually distinguishable acoustics. The method includes, for the respective ink chambers, generating an electrical pulse, applying the pulse to the transducer corresponding to a respective ink chamber in order to generate a pressure wave in the ink, such that a droplet of the ink is jetted out of the nozzle having a size corresponding to the pressure wave, and adjusting the pulse to the acoustics of the respective ink chamber such that the size of the droplet which is jetted is essentially the same for each ink chamber. A printer is configured for application of the method.03-26-2009
20100177133Liquid jet head chip, manufacturing method therefor, liquid jet head, and liquid jet recording apparatus - To provide a liquid jet head chip in which easiness in machining is improved and a narrow pitch of channels and high resolution are realized, a manufacturing method therefor, a liquid jet head, and a liquid jet recording apparatus. The liquid jet head chip includes a first actuator plate and a second actuator plate, each of which has partitions. The first actuator plate and the second actuator plate are superimposed with each other so that partitions thereof are arranged alternately. A discharging channel which is filled with ink is formed between the partition of the first actuator plate and the partition of the second actuator plate.07-15-2010
20100182361Liquid Ejection Head and Liquid Ejection Method - A liquid ejection head including: an insulating nozzle plate 07-22-2010
20100259574LIQUID EJECTING HEAD, LIQUID EJECTING APPARATUS, AND ACTUATOR - A liquid ejecting head includes a flow path forming substrate in which pressure generation chambers are formed. The pressure generation chambers communicate with nozzles that eject liquid droplets. Piezoelectric elements are positioned on the flow path forming substrate to generate pressure changes in the pressure generation chambers. Each piezoelectric element includes a piezoelectric body layer, a first electrode on one side of the piezoelectric body layer, and a second electrode on the opposite side of the piezoelectric body layer. The piezoelectric element is driven in a condition that the relationship between minimum voltage V10-14-2010
20130215172INKJET HEAD AND INKJET RECORDER - According to one embodiment, an inkjet head has a pressure chamber for storing an ink, an actuator for changing the volume of the pressure chamber, and a nozzle through which the ink stored in the pressure chamber is ejected when the volume of the pressure chamber is changed. Additionally, the inkjet head has a temperature sensor for detecting the temperature of the ink and a controller for controlling the actuator by outputting an ejecting waveform. The ejecting waveform sequentially includes an expansion pulse, a first contraction pulse, and a second contraction pulse. The controller changes the pulse width or voltage value of the second contraction pulse when the temperature detected by the temperature sensor changes.08-22-2013
20130215174LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a piezoelectric element provided with a piezoelectric layer and an electrode provided on the piezoelectric layer; and a driving unit supplying a driving waveform driving the piezoelectric element to the piezoelectric element.08-22-2013
20100188451LIQUID EJECTING APPARATUS AND METHOD CONTROLLING LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes: a liquid ejecting head which includes nozzles, pressure generating chambers communicating with the nozzles, and pressure generating elements causing a pressure change in a liquid of the pressure generating chambers and which ejects the liquid from the nozzles in response to an operation of the pressure generating elements; and a driving signal generating unit which drives the pressure generating elements to repeatedly generate a driving signal containing an ejection driving pulse used to eject the liquid from the nozzles. The ejection driving pulse has a pulse waveform containing a first pressure generating chamber expansion component which expands the pressure generating chamber to draw a meniscus toward the pressure generating chamber side, a pressure generating chamber contraction component which contracts the pressure generating chamber expanded by the first pressure generating chamber expansion component to push the meniscus toward the liquid ejection side, and a second pressure generating chamber expansion component which expands the pressure generating chamber contracted by the pressure generating chamber contraction component to draw the meniscus toward the pressure generating chamber side again. Each of the pressure generating chamber expansion components has a plurality of different potential change ratios.07-29-2010
20100225687RECORDING APPARATUS - A recording apparatus for effecting recording by scanningly moving a recording head, wherein the apparatus is provided with a group of a plurality of arrays each including a plurality of nozzles, wherein the group is responsive to one-color recording data, includes selecting means for selecting a block of a predetermined number of the nozzles in the nozzle array in synchronism with cyclic signals; driving means for driving the nozzles in the block selected by the selecting means; managing means for managing information of the block selected by the selecting means, for each group of the nozzle arrays; generating means for generating, for each nozzle array, driving data including information indicative of a block to be selected by the selecting means and block data corresponding to the block, on the basis of the information of the block managed by the managing means; and transfer means for transferring the driving data generated by the generating means to the recording head.09-09-2010
20100225689INK-JET RECORDING APPARATUS - An ink-jet recording apparatus, including: an ink-jet head having an ejection surface; a conveyor mechanism having a conveyor belt with a conveyor surface and a belt drive mechanism for moving the conveyor belt and configured to convey a recording medium; a pair of comb electrodes disposed so as to be opposed to the ejection surface, each comb electrode including a plurality of electrode portions, the electrode portions of one and the other of the comb electrodes being alternately arranged; a voltage-application power source for applying a voltage between the comb electrodes; and a controller having an attraction control portion for controlling the power source so as to attract the medium to the conveyor surface, wherein the attraction control portion is configured to control the power source such that the voltage is applied between the comb electrodes after initiation of the movement of the conveyor belt by the belt drive mechanism.09-09-2010
20100238218LIQUID EJECTING APPARATUS AND METHOD OF MANUFACTURING LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a driving element driven by a driving waveform and a nozzle that ejects liquid in response to the driving element. A driving signal generator generates the driving waveforms in a period and creates a driving signal in which the driving waveforms are repeatedly generated in each period. The driving signal generator creates the driving signal in which at least two first driving waveforms configured to eject the maximum amount of liquid among amounts of liquid ejected from the nozzle once in the period and at least two second driving waveforms configured to eject a different amount of liquid are generated in each period. The driving signal is such that a temporal interval at which the first driving waveform is generated is closer to the half length of the period than a temporal interval at which the second driving waveform is generated.09-23-2010
20100225690LIQUID EJECTING APPARATUS AND CONTROL METHOD THEREOF - A liquid ejecting apparatus includes a liquid ejecting head with a group of nozzles. The liquid ejecting apparatus drives a pressure generating element to generate pressure variation in a liquid in a pressure generating chamber and ejects the liquid from the nozzles using the pressure variation. A driving signal generating unit generates a driving signal including an ejection driving pulse which drives the pressure generating element. An ejection control unit controls application of the ejection driving pulse to the pressure generating element to control a liquid ejecting operation of the liquid ejecting head. The driving signal generating unit generates first and second ejection driving pulses. The ejection control unit calculates a timing at which the amount of the ejected liquid becomes a predetermined correction target value in transition of the ejected liquid amount of each nozzle from a start of the ejecting operation.09-09-2010
20100225688LIQUID DROPLET JETTING HEAD AND LIQUID DROPLET JETTING APPARATUS - A liquid droplet jetting head includes: a first terminal to which is inputted a clock signal; a second terminal to which are serially inputted liquid droplet jetting-related input data in synchronization with the clock signal inputted to the first terminal and to which are serially inputted control data after the input data; a third terminal to which is inputted a pulse signal when input of the input data to the second terminal is completed; a first holding unit that holds the data inputted to the second terminal at a timing when the pulse signal is inputted to the third terminal; a delay unit that delays the pulse signal inputted to the third terminal; and a second holding unit that holds at least the control data inputted to the second terminal at a timing when the delay unit delays the pulse signal.09-09-2010
20100231623Image Forming Apparatus And Mist Recovery Method - The image forming apparatus includes: an inkjet head of an on-demand ejection type having a nozzle plate in which a nozzle electrode is arranged in a vicinity of a nozzle through which liquid is ejected; and a voltage application device which makes a polarity of the nozzle electrode one of positive and negative in accordance with a start of an ejection operation of the liquid, and then switches the polarity of the nozzle electrode to an opposite polarity to the one of positive and negative in accordance with a timing of ejecting the liquid through the nozzle.09-16-2010
20100207978PRINTING METHOD, PRINTING SYSTEM AND STORAGE MEDIUM HAVING PROGRAM RECORDED THEREON - The printing method includes the following steps of: preparing a printing apparatus that includes an element that is driven in order to form a dot, a first drive signal generation section that generates drive signals for driving the element, and a second drive signal generation section that generates drive signals for driving the element; at a certain timing, forming a dot of a predetermined size by generating a first drive signal with the first drive signal generation section and by generating a second drive signal that is different from the first drive signal with the second drive signal generation section; and at a separate timing, forming a dot of the predetermined size by generating the first drive signal with the second drive signal generation section. With this printing method, the first drive signal generation section and the second drive signal generation section can be made to generate an equal amount of heat.08-19-2010
20100141697INK JET APPARATUS - A drop emitting device that includes a drop generator, a drive signal including a plurality of fire intervals applied to the drop generator, wherein the drive signal includes in each fire interval a bi-polar drop firing waveform or a time varying non-firing waveform.06-10-2010
20100079520DEMODULATOR FOR RECORDING HEAD, DATA TRANSFER UNIT FOR RECORDING HEAD AND RECORDING APPARATUS - A demodulator for recording head includes a reference-clock input section to which a reference clock is inputted; a modulated-signal input section to which a plurality of types of modulated signals generated by modulating a plurality of types of recording signals corresponding to a plurality of types of jetting modes of the recording head are inputted; a demodulation-clock generating circuit which generates from the reference clock, a demodulation clock for detecting the timing at which the value of the modulated signal changes; and a demodulator circuit which demodulates the modulated signal to the recording signal by detecting the timing, at which the value of the modulated signal changes, by using the demodulation clock, and the plurality of types of modulated signals have different timings, based on the reference clock, at which values of the modulated signals change, respectively.04-01-2010
20090289980LIQUID JET APPARATUS, PRINTING APPARATUS, AND METHOD OF ADJUSTING PHASE OF DRIVE PULSE - A liquid jet apparatus including a plurality of nozzles provided to a liquid jet head, an actuator corresponding to each of the nozzles, and drive unit that applies a drive pulse to each of the actuators, wherein the drive unit includes correction value storing unit that stores a drive pulse application timing correction value corresponding to the number of actuators to be driven at the same time, and drive pulse application timing correction unit that corrects the drive pulse application timing using the drive pulse application timing correction value stored in the correction value storing unit.11-26-2009
20110211001CONTROL APPARATUS AND LIQUID EJECTING APPARATUS - A control apparatus includes a discharge control unit, wherein the discharge control unit controls liquid so that, before a start of printing of which the printing is performed on a printing medium by ejecting a liquid, which is filled and heated within flow passages, from a nozzle opening, the liquid within the flow passages of the liquid ejecting head is discharged from the nozzle opening, and, after the liquid ejecting head is heated to a printing temperature by the heated liquid and the liquid ejecting head reaches the printing temperature, discharging of the liquid from the nozzle opening is stopped.09-01-2011
20080309693NOZZLE ASSEMBLY FOR EJECTING SMALL DROPLETS - A nozzle assembly for an inkjet printhead is disclosed. The nozzle assembly includes an inkjet nozzle having an actuator for ejecting an ink droplet having a diameter of less than 20 μm from the inkjet nozzle when a resistive element of the actuator is heated by an electrical current. A drive transistor provides an energy pulse to the resistive element of the actuator, and control logic controls the drive transistor.12-18-2008
20130127939LIQUID JET APPARATUS PERFORMING PULSE MODULATION ON A DRIVE SIGNAL - A liquid jet apparatus according to the present invention includes a drive waveform generator adapted to generate a drive waveform signal, a modulator adapted to execute pulse modulation on the drive waveform signal, a digital power amplifier adapted to power-amplify the modulated signal, on which the pulse modulation is executed by the modulator, with a pair of switching elements push-pull coupled with each other, a low pass filter adapted to smooth the amplified digital signal obtained by the power-amplification of the digital power amplifier, and a modulation period modification circuit adapted to modify a modulation period of the pulse modulation of the modulator based on data of the drive waveform signal.05-23-2013
20100220136PRINTER WITH CONTROLLER FOR GENERATING COMBINED PRINT DATA AND CLOCK SIGNAL - An inkjet printer that has a printhead IC an array of nozzles for ejecting drops of printing fluid onto a media substrate and drive circuitry for driving the array of nozzles and, a print engine controller (PEC) for sending print data to the printhead IC. The drive circuitry is configured to extract a clock signal from the data transmission from the PEC.09-02-2010
20090147035INSPECTIVE EJECTION METHOD FOR FLUID EJECTION APPARATUS AND FLUID EJECTION APPARATUS IMPLEMENTING THE METHOD - An inspective ejection method using inspective injection data, including unit ejection data and non-ejection data, for causing fluid to be ejected from nozzle orifices of a fluid ejection apparatus. The unit ejection data is used for individually inspecting each of a group of continuous nozzle orifices of a predetermined number M, less than total number Q. The non-ejection data having a length of at least Q−M is continuously added to a leading or trailing side in a unit ejection data reading direction. A transfer start address is selected in the area of the inspective ejection data at an interval of M, while avoiding duplication of the transfer start address. The inspective ejection data is transferred to an ejection driving unit, starting from the selected transfer start address. The selecting transferring steps are repeated a whole number of times that is Q/M or greater, while changing the transfer start address.06-11-2009
20090315930METHOD OF INKJET PRINTING - A method of inkjet printing includes using a grayscale inkjet print head. The inkjet print head is driven driving to eject a number of successive ink droplets from the ink chamber in accordance with print tone data provided to the grayscale print head, the number of successive ink droplets forming a multiple-droplet drop creating a printed dot of appropriate tone on the receiving medium. The method includes the step of excluding print tone data corresponding with the ejection of a single-droplet drop from being provided to the grayscale print head. A preferred embodiment includes the removal of this print tone data from the data provided to the grayscale print head. A more preferred embodiment includes applying a multilevel halftoning technique for avoiding the use of print tone data corresponding with a single-droplet drop during the generation of the print tone data for inkjet printing the image with the grayscale print head.12-24-2009
20110032293Ink ejector, and ink ejection control method - An ink ejector includes a head movement control section (02-10-2011
20110032295ELEMENT SUBSTRATE, PRINTHEAD, HEAD CARTRIDGE, AND PRINTING APPARATUS - This invention relates to an element substrate capable of confirming an electrical connection status before a printhead malfunctions. The element substrate is a substrate for a printhead, which is detachable from a printing apparatus and includes a plurality of printing elements, a logical circuit for controlling the printing elements, and a voltage application terminal for applying a driving voltage to drive the printing elements. The logical circuit is driven at a voltage lower than the driving voltage. The element substrate includes a connection status output circuit which outputs a signal reflecting the electrical connection status between the printhead and the printing apparatus on the basis of the driving voltage.02-10-2011
20110032294DROPLET EJECTING APPARATUS AND CURRENT CONTROL METHOD - A droplet ejecting component of the present invention includes an ejecting component having a charge and discharge characteristic, an applying component being provided with a transistor, and an increasing component. The ejecting component ejects a droplet. When a control signal is inputted, the applying component applies an application voltage to the ejecting component, and the increasing component increases the impedance of the transistor.02-10-2011
20080309697PRINTHEAD OF AN INKJET PRINTER HAVING DENSELY SPACED NOZZLES - A printhead for an Inkjet Printer is disclosed. The printhead has a large number of nozzle assemblies. Each nozzle assembly has an inkjet nozzle having an actuator for ejecting an ink droplet from the inkjet nozzle when a resistive element of the actuator is heated by an electrical current, a drive transistor for providing an energy pulse to the resistive element of said actuator, and control logic for controlling said drive transistor. Nozzles are spaced from other nozzles ejecting ink of a different color by less than 400 microns.12-18-2008
20100220135INK SUPPLY FOR PRINTHEAD INK CHAMBERS - An inkjet printhead having a wafer substrate defining a planar support surface is disclosed. Ink chambers are includes adjacent the planar support surface of the wafer substrate. The ink chambers are defined by sidewalls extending between a nozzle plate and the wafer substrate. One of the sidewalls of each chamber has an opening to allow ink to refill the chamber. An ink conduit is included between the nozzle plate and wafer substrate. The ink conduit is in fluid communication with the openings of the ink chambers. Ink inlets defined in the wafer substrate are also provided, the ink conduits receiving ink to supply to the ink chambers from at least one of the ink inlets. Each of the ink inlets has an ink permeable trap and a vent sized so that the surface tension of an ink meniscus across the vent prevents ink leakage. During use the ink permeable trap directs gas bubbles to the vent where the gas bubbles vent to atmosphere.09-02-2010
20100220134FLUID EJECTING APPARATUS AND FLUID EJECTING METHOD - A fluid ejecting apparatus includes a head that performs a fluid ejecting method by ejecting a fluid on a medium in response to a driving signal. A moving mechanism relatively moves the head and the medium in a predetermined direction. A driving signal generating unit generates the driving signal, which produces a plurality of driving waveforms during a cycle in accordance with a relative moving velocity of the head and the medium in a predetermined direction. The plurality of driving waveforms are repeatedly produced every cycle. A control unit ejects the fluid from the head while the head and the medium are relatively moved in the predetermined direction. The fluid ejecting apparatus causes the driving signal, of which a final driving waveform among the plurality of driving waveforms produced during the cycle is corrected based on the relative moving velocity, to be generated from the driving signal generating unit.09-02-2010
20100220133HEAD DRIVE APPARATUS OF INKJET PRINTER AND INKJET PRINTER - A head drive device of an inkjet printer having a nozzles and corresponding actuators that jet liquid drops. A drive section applies a drive signal to the actuators. The head drive device includes a drive waveform generating section that generates a drive waveform signal which is used as a reference of a signal to control drive of the actuators. A modulating section modulates a pulse of a drive waveform signal generated by the drive waveform generating section. A digital power amplifier amplifies power of a modulated signal subjected to the pulse modulation. A low pass filter smoothes a power-amplified modulated signal subjected to the power amplification by the digital power amplifier and supplies the signal as a drive signal to the actuators. A frequency characteristics adjusting section adjusts frequency characteristics of the low pass filter as a function of the number of the actuators.09-02-2010
20110122183PRINTHEAD INCORPORATING PRESSURE PULSE DIFFUSING STRUCTURES BETWEEN INK CHAMBERS SUPPLIED BY SAME INK INLET - An inkjet printer includes a printhead having a plurality of ink chambers fed be an ink inlet, each ink chamber having a heater element for ejecting drops of ink from a nozzle aperture of each chamber; a plurality of pressure pulse diffusing structure positioned between the plurality of ink chambers fed by the ink inlet, the plurality of pressure pulse diffusing structures for retarding a propagation of pressure waves generated by each ink chamber to adjacent ink chambers; and a controller for receiving print data and generating drive pulses to energize the heater elements in accordance with the print data. The controller increases the drive pulse energy during the printhead lifetime such that the drive pulse energy is never less than that of a preceding drive pulse.05-26-2011
20110122180CONTINUOUS INKJET PRINTER AQUOUS INK COMPOSITION - A continuous ink jet printer aqueous ink composition including pigment particles dispersed with a dispersant or self dispersing pigment particles without the need for a dispersant, and a polymer additive distinct from any dispersant used to disperse the pigment particles, wherein the polymer additive comprises a styrene-acrylic copolymer that does not substantially displace any dispersant used to disperse the pigment, present in an amount effective to stabilize the ink composition against shear induced agglomeration caused by pumping the ink composition through a continuous ink jet printing fluid system. A method of continuous ink jet printing includes A) providing a main fluid supply of a continuous inkjet printer with an aqueous ink composition of the invention; B) pumping the ink composition from the main fluid supply to a print head and ejecting a continuous stream of the ink composition from the print head which continuous stream is broken into spaced droplets; and C) in response to electrical signals received from a control mechanism, controlling the spaced droplets to select between printing droplets for marking a substrate and nonprinting droplets that are collected and returned to the main fluid supply.05-26-2011
20090066740PRINTER CONTROLLER FOR CONTROLLING AN INK DOT SIZE - Provided is a printer controller for an inkjet printer having a printhead with a plurality of nozzle arrangements, a paper transport mechanism, and an authentication chip. The controller has a data bus and purpose-specific functional units connected to the data bus. The controller is configured to execute software to control a dot size of ink discharged by the respective nozzles by heating the ink in a nozzle by applying at least one firing pulse of a duration less than a duration required to discharge an ink dot, sensing the temperature of the heated ink in the nozzle, and loading and updating a table having sensed values of temperature of ink in the nozzle, resistivity of an actuator heater of the nozzle and width of at least part of the actuator heater. The controller then changes the duration of a firing pulse used to discharge an ink dot in response to the updated table of sensed temperature, resistivity and width values so as to produce a uniform ink dot size.03-12-2009
20090066739HEAD DRIVE DEVICE OF INKJET PRINTER AND INK JET PRINTER - A head drive apparatus of an inkjet printer, having: a plurality of nozzles provided to an inkjet head for ejecting liquid drops; actuators provided corresponding to the nozzles; and a drive unit that applies a drive signal to the actuators, wherein the drive unit, comprising: a drive waveform generator that generates a drive waveform signal as a reference of a signal to control drive of the actuators; a modulator that pulse modulates a drive waveform signal generated by the drive waveform generator; a digital power amplifier that amplifies power of a modulated signal subjected to the pulse modulation by the modulator; a low pass filter that smoothes a amplified digital signal subjected to the power amplification by the digital power amplifier and supplying the signal as a drive signal to the actuators; and an inverse filter provided in a subsequent stage of the drive waveform generator that corrects at least the frequency characteristics of the filter comprised of capacitances of the low pass filter and the actuators to a predetermined frequency characteristics, independently of the number of the actuators to drive.03-12-2009
20090066738LIQUID DROPLET EJECTING APPARATUS - A liquid droplet ejecting apparatus includes: a piezoelectric body that deforms and ejects liquid droplets as a result of a voltage being applied thereto and, when a superposed voltage, obtained by superposing a constant voltage of a constant voltage level and a waveform voltage of a sinusoidal waveform is applied thereto, an electrostatic capacitance and a deformation amount changes in response to the voltage level of the constant voltage; and a voltage applying unit that uses, as a reference voltage level, a voltage level of the constant voltage when the square of the deformation amount divided by the electrostatic capacitance is at a maximum value, and which applies to the piezoelectric body, when the piezoelectric body is to eject the liquid droplets, a drive voltage in which a drive waveform is superposed on the constant voltage that is within a predetermined range that includes the reference voltage level03-12-2009
20110025740DROPLET EJECTING APPARATUS AND CURRENT CONTROL METHOD - A droplet ejecting component of the present invention includes an ejecting component having a charge and discharge characteristic, an applying component being provided with a transistor, and an increasing component. The ejecting component ejects a droplet. When a control signal is inputted, the applying component applies an application voltage to the ejecting component, and the increasing component increases the impedance of the transistor.02-03-2011
20110115840PRINTING APPARATUS AND PRINTING METHOD - In printing of multi-level darkness/lightness of a certain color, which is performed with a dark ink and a light ink of the certain color, graininess is improved. A printing method includes generating a plurality of types of drive signals, and ejecting the dark ink and the light ink from a head, an amount of each ink varying for each dot tone value. In generation of a plurality of the types of the drive signals, a plurality of the types of drive signals are generated, where a waveform section that is for the dark ink of the certain color and that corresponds to a minimum dot tone value in ejection of ink is different from a waveform section that is for the light ink of the certain color and that corresponds to the minimum dot tone value, and where a waveform section that is for the dark ink of the certain color and that corresponds to a maximum dot tone value is different from a waveform section that is for the light ink of the certain color and that corresponds to the maximum dot tone value. In ejection of the dark ink and the light ink from the head, a drive signal that is generated based on a type of the dot tone value designated according to a size of a to-be-formed dot and based on a type of the ink is applied to an element that is provided on the head and that performs an operation for ejecting ink.05-19-2011
20110084996INKJET RECORDING APPARATUS AND METHOD, AND ABNORMAL NOZZLE DETECTION METHOD - The inkjet recording apparatus includes: an abnormal nozzle detective waveform signal generating device which generates a drive signal having an abnormal nozzle detective waveform including a waveform that is different from a recording waveform and applied to pressure generating elements when performing ejection for abnormality detection to detect an abnormal nozzle among nozzles; an abnormal nozzle detective device which identifies the abnormal nozzle showing an ejection abnormality from results of the ejection for abnormality detection; a correction control device which corrects image data in such a manner that ejection is stopped from the identified abnormal nozzle and a desired image is recorded by the nozzles other than the abnormal nozzle; and a recording ejection control device which performs image recording by controlling ejection from the nozzles other than the abnormal nozzle in accordance with the image data that has been corrected by the correction control device.04-14-2011
20100165026PRINTING APPARATUS AND PRINTING METHOD - A printing apparatus includes a head and a drive signal generating section. The head has an element performing operation for ejecting ink and ejects a plurality of types of inks, an amount of each ink ejected by the head being different depending on a designated tone value. The drive signal generating section generates a drive signal having a waveform section for operating the element and generates a plurality of types of the drive signals for a specific tone value, the waveform section of each of the drive signals for the specific tone value being different depending on the types of inks.07-01-2010
20100165023LIQUID JET HEAD - A recording apparatus includes: a recording head that comprises: an inlet; an outlet; a supply and discharge flow path; a nozzle; and a liquid supply flow path, a liquid flow forming unit that forms a flow of liquid toward the outlet in the supply and discharge flow path; a first temperature sensor; a second temperature sensor; a heating unit; and a control unit that controls the liquid flow forming unit and the heating unit on the basis of a first detection temperature and a second detection temperature, wherein the first temperature sensor is disposed in a first position between the inlet and the communicating position of the liquid supply flow path, wherein the second temperature sensor is disposed in a second position between the outlet and the communicating position, wherein the heating unit is disposed in a third position between the inlet and the communicating position.07-01-2010
20110211002DROPLET PROPELLING DEVICE - A drive pulse P09-01-2011
20110122181PRINTHEAD SUBSTRATE, PRINTHEAD AND PRINTING APPARATUS - A printhead substrate comprises: a plurality of printing elements arrayed in a predetermined direction; first logic circuits arranged in correspondence with respective groups each assigned to a predetermined number of adjacent printing elements, and configured to select a printing element to be driven from the printing elements belonging to each of the groups; driving circuits configured to drive the printing elements based on signals output from the first logic circuits; second logic circuits configured to supply externally input printing data to the first logic circuits corresponding to the respective groups; and electricity storage units arranged in the respective groups, connected to a power supply line for supplying power to at least one of the first logic circuits, the second logic circuits, and the driving circuits, and configured to store charges in accordance with a voltage applied through the power supply line.05-26-2011
20100156974INKJET PRINTING APPARATUS AND PRINTHEAD CONTROL METHOD OF THE APPARATUS - A control signal to control ink discharge from a printhead is generated. Urgency of A/D conversion of a detection signal is generated in accordance with a position represented by a signal output from an encoder. Upon determining based on the urgency to perform A/D conversion, control signal generation stops. Upon determining that a printing operation is not being performed, control is executed to A/D convert the detection signal. However, upon determining that the printing operation is being performed, control is executed to perform A/D conversion after the end of the printing operation. The stopped control signal generation is immediately resumed if it is determined that the A/D conversion has ended. However, upon determining that the A/D conversion has not ended, control signal generation is resumed after the end of the A/D conversion.06-24-2010
20110128317CAPACITIVE LOAD DRIVING CIRCUIT - A capacitive load driving circuit includes: a voltage waveform output unit that outputs a voltage waveform used for driving a plurality of capacitive loads; and a voltage waveform applying unit that connects each of the plurality of capacitive loads to output of the voltage waveform output unit to thereby apply the voltage waveform to each of the plurality of capacitive loads, wherein the voltage waveform applying unit releases the connection between the capacitive load and the output of the voltage waveform output unit when voltage of the voltage waveform falls outside a voltage range determined for each of the plurality of capacitive loads, and connects the capacitive load to the output of the voltage waveform output unit when the voltage of the voltage waveform falls within the voltage range, to thereby apply a different voltage waveform to each of the plurality of capacitive loads.06-02-2011
20100238217LIQUID EJECTING APPARATUS AND METHOD OF MANUFACTURING LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a driving element driven by a driving waveform and a nozzle that ejects liquid. Two first driving waveforms and a second driving waveform are generated in a period to create a driving signal in which the two first and the second driving waveforms are repeatedly generated. When the first driving waveform is applied to the driving element, a first amount of liquid is ejected from the nozzle. When the two first driving waveforms are applied, twice the first amount is ejected. When the second driving waveform is applied, a second amount of liquid larger than the first amount and smaller than twice the first amount is ejected. When the two first driving waveforms and the second driving waveform are applied to the driving element, an amount of liquid smaller than a sum of twice the first amount and the second amount is ejected.09-23-2010
20090219315Liquid Discharge Device, Piezoelectric Ink Jet Head, and Driving Method for Liquid Discharge Device - It is possible to minimize the amplitude of residual vibration of a piezoelectric actuator so as to maintain the image quality of a formed image at a preferable level in case of an ink jet head, for example. A liquid discharge device includes a control unit (09-03-2009
20100013881INK JET PRINTING SYSTEMS - The invention is concerned generally with ink jet printing, in particular to methods and apparatus for printing using print heads having a plurality of nozzles and to related print engines. A method of generating data for driving an ink jet print head having a plurality of nozzles to print a portion of an image comprising a plurality of pixels, the method comprising: storing nozzle position data defining spatial positions of said nozzles with respect to said print head in terms of pixel offsets from a reference position on said print head; reading image data for said image, said image data comprising data for said plurality of pixels; inputting head position data defining a position for said print head; processing said image data using said head position data and said nozzle position data to determine nozzle firing data for controlling said print head to deposit ink at said spatial positions of said nozzles with respect said head position in accordance with said image data.01-21-2010
20120242726INK-JET HEAD - The present invention related to an ink-jet head, adaptive for an ink cartridge including at least one ink tank, the ink jet head includes: a nozzle board, having a plurality of nozzles; and an ink-jet chip, being used for controlling the ink-jetting and having a total area region consisting of a length and a width, wherein the total area region includes: a non-wiring region, where at least one ink flow channel being installed therein; and a wiring region, where an internal circuit being installed therein; wherein the internal circuit includes a plurality of ink-jet unit sets, and every ink-jet units of the plurality of ink-jet unit sets include a heater installed correspondingly to the nozzle; wherein the area of the wiring region of the ink-jet chip is less than 77% of the area of the total area region of the ink-jet chip.09-27-2012
20100053243LIQUID EJECTION SUBSTRATE AND LIQUID EJECTION HEAD USING SAME - A liquid ejection substrate used to eject a liquid includes a substrate having an element row including a plurality of elements provided in a row, where each of the elements generates energy, drive circuits that drive and control the elements, a signal line that is shared by and connected to the drive circuits, the signal line being provided along the element row, and a heating portion generating heat used to heat the substrate, wherein the heating portion is provided so that the heating portion does not overlap the signal line with reference to a direction perpendicular to a face of the substrate.03-04-2010
20100053244LIQUID EJECTING APPARATUS AND EJECTION INSPECTING METHOD - Provided is a liquid ejecting apparatus including: a liquid ejecting head that ejects liquid from nozzle openings by driving of an ejection driving portion; a driving signal generation portion that generates a driving pulse for driving the ejection driving portion; a liquid receiving portion that is disposed so as to oppose a nozzle forming face of the liquid ejecting head and receive ink ejected from the nozzle openings; and an ejection inspecting portion that detects an electrical variation occurring between a conductive portion of the liquid ejecting head and the liquid receiving portion when liquid is ejected toward the liquid receiving portion from the nozzle openings in a state where an electric voltage is applied between the conductive portion and the liquid receiving portion, thereby inspecting whether or not liquid has been ejected from the nozzle openings. The driving signal generation portion generates a normal driving pulse which is used for processes other than an ejection inspection process by the ejection inspecting portion and an ejection inspection driving pulse which is different from the normal driving pulse and is used for the ejection inspection process by the ejection inspecting portion.03-04-2010
20110175956INKJET EJECTION APPARATUS, INKJET EJECTION METHOD, AND INKJET RECORDING APPARATUS - A standard drive waveform contains, in one ejection cycle: a first ejection waveform group including at least one ejection waveform causing liquid to be ejected from a nozzle to form one dot of a maximum size; a first non-ejection waveform arranged after the first ejection waveform group; a second ejection waveform group including at least one ejection waveform causing the liquid to be ejected from the nozzle to form a dot of a minimum size; and a second non-ejection waveform arranged after the second ejection waveform group. At least one of the ejection waveforms is selected from one of the first and second ejection waveform groups in accordance with ejection data. When the selected ejection waveform belongs to the first ejection waveform group, the first non-ejection waveform is further selected. When the selected ejection waveform belongs to the second ejection waveform group, the second non-ejection waveform is further selected.07-21-2011
20100128076DROPLET JET HEAD AND DROPLET JET APPARATUS - A droplet jet head includes a nozzle substrate having a plurality of nozzle holes; a cavity substrate having recesses whose bottoms serve as diaphragms, and the recesses serving as ejection chambers; an electrode substrate having separate electrodes opposed to the diaphragms; a reservoir substrate having a recess serving as a common droplet chamber for supplying droplets to the ejection chambers, through holes for transferring the droplets from the common droplet chamber to the ejection chambers, and nozzle communicating holes for transferring the droplets from the ejection chambers to the nozzle holes; and a driver IC that supplies a driving signal to the separate electrodes. The cavity substrate has a first hole, and the reservoir substrate has a second hole. The first hole and the second hole communicate with each other to form a housing. The driver IC is housed in the housing.05-27-2010
20100134543RECORDING ELEMENT SUBSTRATE AND RECORDING HEAD HAVING THE SAME - A recording element substrate includes a recording element, a first voltage conversion circuit configured to receive a first control signal and to output the first control signal with an increased amplitude, a second voltage conversion circuit configured to receive a second control signal and to output the second control signal with an increased amplitude, a PMOS transistor connected to one end of the recording element, and an NMOS transistor connected to the other end of the recording element, wherein the PMOS transistor has a gate connected to an output of the first voltage conversion circuit, and the NMOS transistor has a gate connected to an output of the second voltage conversion circuit.06-03-2010
20100238215INK JET HEAD, NOZZLE PLATE THEREOF AND PRINTING METHOD USING THE SAME - Disclosed is an ink jet head for ejecting an ink droplet to form an image on a recording medium, including a pressure chamber to which ink is supplied, an actuator which applies a pressure on the ink filled in the pressure chamber to eject the ink droplet, a circuit applying to the actuator a drive-waveform for sequentially ejecting one or more ink droplets to form one pixel, the one ink droplet having V in volume, and a nozzle plate which has a nozzle fluidly communicating with the pressure chamber to eject ink droplet therefrom, the nozzle having a stepped inner surface shaped to include an inlet communicating with the pressure chamber and having a first sectional area in an orthogonal plane to ink-ejecting direction, and to include an outlet communicating with the inlet and having a length Ln09-23-2010
20090027431INKJET APPARATUS AND DRIVING METHOD, AND MANUFACTURING METHOD OF DISPLAY APPARATUS USING THE SAME - In one embodiment, a driving method of an inkjet apparatus, includes applying the same driving pulse to a plurality of piezoelectric elements; measuring a discharge speed and a discharge volume of a discharged object which is discharged through a plurality of nozzles; adjusting the discharge speed which comprises comparing the discharge speed and discharge volume of each nozzle with a predetermined reference permissible range to detect nozzle deviations from the reference permissible range, and adjusting the discharge characteristic of the one or more detected nozzles within the reference discharge permissible range.01-29-2009
20110074848LIQUID DISCHARGE APPARATUS AND IMAGE FORMING APPARATUS - A liquid discharge apparatus includes a liquid discharge head and a circuit board. The liquid jetting head includes a channel unit in which a plurality of nozzles and a plurality of liquid channels communicating with the nozzles respectively are formed, a plurality of drive portions which drive a plurality of deforming portions to deform so as to apply a jetting pressure to a liquid in the liquid channels, a plurality of lead portions arranged to cover the electrodes while maintaining a space between the electrodes and the lead portions, and a plurality of input terminals which are electrically connected to the electrodes via the lead portions. A plurality of connecting terminals which are electrically connected to the input terminals respectively are formed on the circuit board.03-31-2011
20110249050Liquid Ejecting Apparatus and Control Method of Liquid Ejecting Apparatus - Liquid ejecting apparatus and related methods of operation are disclosed. A liquid ejecting apparatus includes an ejecting head having liquid-ejecting nozzles, a platen disposed to support a recording medium and face the ejecting head, a movement section that moves the ejecting head relative to the platen, a heater that heats the platen, a temperature sensor to detect a temperature of the ejecting head, a driving waveform generation section that generates a driving waveform to drive the ejecting head in accordance with the detected temperature, and a liquid ejection control section that supplies the driving waveform to the ejecting head to eject liquid for printing on the recording medium in a printing area. The driving waveform is generated according to a temperature of the ejecting head that is detected when the ejecting head has come to an area outside the printing area.10-13-2011
20100097418RECORDING HEAD AND RECORDING APPARATUS USING RECORDING HEAD - A recording head having a plurality of recording elements that are grouped into a plurality of blocks and ejecting ink by driving the recording elements in a time-divisional manner includes driving units configured to drive the recording elements, an input unit configured to receive an enable signal that defines a period during which the driving of the recording elements is enabled at one ink ejection, and a control unit configured to control the time-divisional driving by the driving units on the basis of pulses detected during the period defined by the enable signal received by the input unit.04-22-2010
20100097419Liquid Jetting Device - A liquid jetting device includes a plurality of nozzles. A driving signal generated by a driving signal generating section is applied to a charge-discharge actuator in correspondence with each nozzle to jet liquid from the nozzle. A charging source potential preliminary adjusted wave-form signal is pulse modulated and electrically amplified using a charging source potential transistor pair connected in a push-pull configuration, and output by a ripple filter to a collector of a charge-use transistor of the driving signal generating section to make a preliminary adjustment to the charging source potential for the driving signal generating section.04-22-2010
20110148962LIQUID EJECTING APPARATUS AND CONTROL METHOD THEREOF - A return component that gently expands the volume of the pressure generating chamber, wherein a time interval of the expansion component is longer than that of the expansion holding component, and a time interval of the return component is longer than that of the contraction holding component, wherein a first reference potential is set to be 50% or more of the potential of the contraction holding component, and wherein when the ejection driving pulse is applied to a piezoelectric oscillator, a flow rate of the ink ejected from the nozzle opening is 0.36 mg/s or more.06-23-2011
20110148963Method for Driving Liquid Ejector - A method for driving a liquid ejector (06-23-2011
20120200624METHOD AND APPARATUS FOR CONTROLLING JETTING PERFORMANCE IN AN INKJET PRINTER - A printer receives print jobs and identifies at least one parameter associated with a print job to select a pressure level for at least one ink reservoir and at least one firing signal waveform for operating a printhead in the printer. The selected pressure and waveform enable optimal image quality for existing conditions identified from the print jobs performed by the printer.08-09-2012
20120033005METHOD FOR SETTING UP DRIVE SIGNAL - A method for setting up a condition for a drive signal in a liquid ejection head that includes a plurality of linearly-arranged nozzles and driving elements provided for each of the nozzles, includes: calculating an average value or a median value of ejection rates for each nozzle relating to a supply of the drive signal under a plurality of conditions; classifying the plurality of nozzles into a plurality of groups based on the average value or the median value of the ejection rates; calculating a proper condition for the drive signal corresponding to each group based on a statistical value of the ejection rate relating to the group; and selecting one proper condition among proper conditions corresponding to the groups so as to set the selected proper condition for each nozzle.02-09-2012
20100321432INK JET PRINTING SYSTEMS AND METHODS WITH PRE-FILL AND DIMPLE DESIGN - Systems and methods of ejecting ink drops from an inkjet printer are disclosed. The systems and methods can include a printhead with one or more actuators with associated nozzles and membranes A voltage waveform can be applied to the actuators to fill the actuators with a volume of ink and eject the ink through the nozzles as ink drops. The voltage waveform can have associated pre-fill voltage to fill the actuator with ink and a firing voltage to eject the ink. The actuator membranes can have multi-height dimples to protect the membranes from contacting electrodes and reduce the electric field.12-23-2010
20080204492METHOD OF PRODUCING THERMOELASTIC INKJET ACTUATOR - A method of producing a thermoelastic actuator assembly having desired operating characteristics includes determining a desired negative pressure pulse characteristic for the actuator, determining a heat dissipation profile corresponding to the desired negative pressure pulse characteristic, and forming the thermoelastic actuator with a heat conduction means arranged to realize the profile.08-28-2008
20110261098LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes: a head having a nozzle; a pressure-changing unit for changing pressure of liquid in the nozzle in such a manner that the liquid is ejected from the nozzle; a first level-data setting unit for setting a selected first level data from a plurality of first level data, based on an ejecting data for a first kind of liquid; a second level-data setting unit for setting a selected second level data from a plurality of second level data, based on an ejecting data for a second kind of liquid; a driving-signal generator for generating a driving signal; and a driving-pulse generator for generating a driving pulse based on the selected first or second level data and the driving signal. The plurality of first level data and the plurality of second level data are different from each other.10-27-2011
20110164082Pulse Width Control Device and Method, Inkjet Printing Device Using the Device - Disclosed is a pulse width control device, including: a first monostable multivibrator, for receiving a synchronization pulse, and generating a negative pulse whose width is a first preset threshold; a second monostable multivibrator, for receiving the synchronization pulse, and generating a positive pulse whose width is a second preset threshold; an inverter, for receiving the synchronization pulse, and inverting the synchronization pulse, and outputting an inverted synchronization pulse; and a flip-flop, for receiving the negative pulse, the positive pulse and the inverted synchronization pulse, and generating a synchronization pulse with a width between the first threshold and the second threshold.07-07-2011
20110164081ENERGY CONTROL OF A NOZZLE OF AN INKJET PRINTHEAD - A nozzle assembly for an inkjet printhead is disclosed. The nozzle assembly includes an inkjet nozzle having an actuator for ejecting an ink droplet from the inkjet nozzle when a resistive element of the actuator is heated by an electrical current. A drive transistor provides an energy pulse to the resistive element of the actuator upon receipt of a control pulse. Each energy pulse has energy of less than 200 nanojoule.07-07-2011
20110134176LIQUID EJECTING APPARATUS - The driving signal generation unit generates a leading driving pulse that is ahead in a unit cycle and a following driving pulse that follows the leading driving pulse; the leading driving pulse is set so that, in the case where liquid droplets are ejected simultaneously from multiple adjacent nozzles, the flight speed of the ejected liquid droplets located toward the central area in a nozzle row direction is higher than the flight speed of the ejected liquid droplets located toward the end areas in the nozzle row direction; and the following driving pulse is set so that, of the liquid droplets simultaneously ejected from the multiple adjacent nozzles, the flight speed of the ejected liquid droplets located toward the end areas is higher than the flight speed of the liquid droplets located toward the central area.06-09-2011
20100328378LIQUID DROPLET JETTING APPARATUS - A liquid droplet jetting apparatus which jets liquid droplets includes: a liquid droplet jetting head which has a nozzle for jetting the liquid droplets; and a jetting controller which controls the liquid droplet jetting head to jet the liquid droplets from the nozzles by supplying the liquid droplet jetting head with a driving signal having a predetermined drive waveform in each of continuing driving periods, and which includes: a driving waveform selecting section which selects, with respect to each of the continuing driving periods, a driving waveform from a plurality of driving waveforms each having a wavelength which is same as a length of one driving period; and a driving waveform shifting section which shifts the driving waveform selected by the driving waveform selecting section.12-30-2010
20100225686PRINT SIGNAL GENERATION SYSTEM - An embodiment of a print signal generation system is provided. The system comprises a sensor, a divisor processing unit, a reference signal generator, and a print trigger signal generator. The sensor detects a first offset of a first location of a medium being printed. The divisor processing unit generates a first divisor according to the first offset and a predetermined divisor. The reference signal generator generates a reference signal. The print trigger signal generator generates a print trigger signal according to the first divisor and the reference signal.09-09-2010
20110254887CAPACITIVE LOAD DRIVING DEVICE AND LIQUID JET APPARATUS - A capacitive load driving device includes a drive waveform generator that generates a drive waveform signal, a subtractor that outputs a difference signal between the drive waveform signal and a feedback signal, a modulator that pulse-modulates the difference signal to output a modulated signal, a digital power amplifier that amplifies the modulated signal to output an amplified digital signal, a low pass filter that smoothes the amplified digital signal to output a drive signal for a capacitive load, a feedback circuit that outputs the feedback signal obtained from the drive signal, and an adjusting section that adjusts frequency characteristics of the feedback circuit based on capacitance of the capacitive load to be driven.10-20-2011
20110134174DRIVING DEVICE FOR LIQUID DROPLET JETTING DEVICE, LIQUID DROPLET JETTING DEVICE, IMAGE FORMING APPARATUS, AND COMPUTER READABLE MEDIUM - A driving device for a liquid jetting apparatus includes an application unit and a controller. The application unit generates and applies a first voltage of a first waveform to a first pressure generating unit and generates and applies a second voltage of a second waveform to the second pressure generating unit to jet a liquid droplet outside a nozzle after pulling liquid inside the nozzle. The second waveform includes at least one of a third waveform corresponding to a jetting angle for changing a jetting direction from a reference direction by deforming a liquid level of liquid pulled inside the nozzle in a direction of pushing the liquid level outside the nozzle, or a fourth waveform corresponding to a jetting angle for changing the jetting direction from the reference direction by deforming the liquid level of liquid pulled inside the nozzle in a direction of further pulling the liquid level.06-09-2011
20110080443LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a liquid ejecting head, a driving signal generating section, a drive control section, and a sealing section. The liquid ejecting head includes a continuous liquid path and a pressure generating section. The liquid path contains a pressure space and a nozzle opening. The driving signal generating section generates a driving signal containing a driving pulse that drives the pressure generating section. The driving pulse includes a first pulse for causing discharge of droplets and a second pulse that is generated to the pressure generating section at a generation interval T set in a range represented by the following expression: (n−1/4)Tc04-07-2011
20100110128LIQUID EJECTING APPARATUS AND LIQUID EJECTING METHOD - A liquid ejecting apparatus includes: a pressure chamber that communicates with a liquid supply section and a nozzle; an element that changes a pressure of liquid within the pressure chamber; and an ejection pulse generation section that generates an ejection pulse for operating the element in order to eject the liquid from the nozzle. In the apparatus, the viscosity of the liquid is not less than 8 millipascal seconds. The nozzle has a first portion in which a liquid ejection side thereof has a smaller opening area than a pressure chamber side thereof, and a second portion which communicates with an ejection side end portion of the first portion. In addition, the ejection pulse has a depressurizing portion for depressurizing the liquid in order to attract a meniscus positioned on the second portion to the first portion, and a pressurizing portion for pressurizing the liquid in order to eject the liquid before the meniscus attracted to the first portion returns to the second portion.05-06-2010
20100110126METHOD FOR DRIVING DROPLET EJECTING HEAD AND DROPLET EJECTING DEVICE - A method for driving a droplet ejecting head that includes a liquid pressure chamber communicating with a nozzle hole, and a pressure application unit applying pressure on liquid stored in the liquid pressure chamber for ejecting a droplet from the nozzle hole, includes applying on the liquid stored in the liquid pressure chamber pressure having a waveform whose phase is delayed by 90 degrees from a waveform of a residual vibration of the liquid by the pressure application unit after an ejection of the droplet from the nozzle hole.05-06-2010
20100194803LIQUID EJECTING APPARATUS AND METHOD OF DRIVING LIQUID EJECTING HEAD - A liquid ejecting apparatus includes a liquid ejecting head having a pressure generating chamber which communicates with a nozzle opening for discharging a liquid and a pressure generating unit which generates a pressure variation within the pressure generating chamber; and a driving unit that supplies the pressure generating unit with a driving signal having an inflation element in which the pressure generating chamber is inflated, a contraction element in which the pressure generating chamber is contracted to discharge a liquid from the nozzle opening, and a re-inflation element in which the pressure generating chamber is inflated during the contraction element, wherein the re-inflation element is initiated in a state that two different phases of vibration of the meniscus within the nozzle opening are not opposite to each other.08-05-2010
20110141171System and Method for Compensating for Small Ink Drop Size in an Indirect Printing System - A method improves transfer efficiency of ink images on an image receiving member that were formed with small ink drops. The method includes identifying image data that correspond to ink drops that have a mass less than a predetermined threshold and that fail to comingle with another ink drop ejected with reference to the image data, modifying the identified image data to generate ink drops that comingle with at least one other ink drop ejected with reference to the image data, generating firing signals for inkjet ejectors in a print head with reference to the image data and modified image data, and ejecting in response to the firing signals a plurality of ink drops from the inkjet ejectors for each identified image data to enable a coalesced ink drop to form on an image receiving surface that has a mass that is greater than the predetermined threshold.06-16-2011
20100026745LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a head including: a first nozzle column where nozzles ejecting a first liquid are aligned in a predetermined direction at a predetermined interval; a second nozzle column where nozzles ejecting the first liquid are aligned in the predetermined direction at the predetermined interval; a third nozzle column where nozzles ejecting a second liquid are aligned in the predetermined direction at the predetermined interval; and a fourth nozzle column where nozzles ejecting the second liquid are aligned in the predetermined direction at the predetermined interval, wherein the first nozzle column is disposed off of the second nozzle column in a direction intersecting the predetermined direction, and the interval between a nozzle at an end portion of the first nozzle column and a nozzle at an end portion of the second nozzle column is the predetermined interval in the predetermined direction, wherein the fourth nozzle column is disposed off the third nozzle column in the direction intersecting the predetermined direction, and the interval between a nozzle at an end portion of the third nozzle column and a nozzle at an end portion of the fourth nozzle column is the predetermined interval in the predetermined direction, wherein the second nozzle column and the third nozzle column are disposed to be aligned in the predetermined direction, and wherein the liquids are ejected from the second nozzle column and the third nozzle column according to a common driving signal.02-04-2010
20120147076LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a liquid ejecting head unit including a plurality of liquid ejecting heads in a parallel arrangement. Each liquid ejecting head ejects a liquid from nozzles formed in a nozzle face toward an ejection target object in accordance with a drive signal from a controller. Each liquid ejecting head has an individual two-dimensional code that includes at least a portion of information related to the liquid ejecting head. The liquid ejecting head unit includes a collective two-dimensional code that includes arrangement information of the liquid ejecting heads in the liquid ejecting head unit and collective information related to the information included in the individual two-dimensional codes.06-14-2012
20110018922INK JET HEAD - Disclosed is an ink jet head exhibiting good assemblability while protecting an electrode portion. An ink jet head (01-27-2011
20120306952IMAGE FORMING APPARATUS AND DRIVE-VOLTAGE GENERATING CIRCUIT - An image forming apparatus includes: a plurality of heads, each of which includes a capacitive load used as an actuator for discharging ink; a drive-voltage generating circuit that outputs a drive voltage to be applied to the actuator and includes a plurality of current amplifying circuits; and a plurality of head drivers that control the actuators of the heads. Each of the current amplifying circuits is configured to include a plurality of bipolar transistors and to operate so as to equalize output current loads of the bipolar transistors included in the current amplifying circuits, and waveforms of the drive voltages output from the current amplifying circuits are combined to form a combined waveform of the drive voltages to be applied to each of the head drivers.12-06-2012
20120038695NOZZLE ASSEMBLY OF AN INKJET PRINTHEAD - A nozzle assembly for an inkjet printhead is disclosed. The nozzle assembly includes an inkjet nozzle having an actuator for ejecting an ink droplet from the inkjet nozzle, and control logic for outputting a control pulse in response to input data. The nozzle assembly also includes a drive transistor for providing an energy pulse to the actuator upon receipt of the control pulse. Each energy pulse applied to the actuator for ejecting the ink droplet has a pulse voltage of less than 5 Volt and energy of less than 800 nano Joule.02-16-2012
20110050769METHOD AND APPARATUS FOR DRIVING INKJET HEAD - A method for driving an inkjet head includes the step of applying drive signals including an ejection signal used for ejecting ink and a non-ejection signal used for not ejecting the ink, to an actuator provided with a pressure chamber at a constant cycle so as to increase or reduce pressure in the pressure chamber in such a manner that the ink is ejected or not ejected from a nozzle connected with the pressure chamber, wherein: a waveform of the ejection signal includes a combination of an ejection pulse for causing a droplet of the ink to be ejected from the nozzle and a non-ejection pulse for not causing a droplet of the ink to be ejected from the nozzle, the ejection pulse of the waveform of the ejection signal includes a part for reducing the pressure in the pressure chamber and a part for increasing the reduced pressure in the pressure chamber, the non-ejection pulse of the waveform of the ejection signal includes a part for reducing the pressure in the pressure chamber and a part for increasing the reduced pressure in the pressure chamber, the part for reducing the pressure in the pressure chamber of the non-ejection pulse of the waveform of the ejection signal is set to reduce the pressure in the pressure chamber while a tail of a droplet of the ink ejected from the nozzle by the ejection pulse is connected to the nozzle, the part for increasing the pressure in the pressure chamber of the non-ejection pulse of the waveform of the ejection signal is set to increase the pressure in the pressure chamber within a resonance period of the pressure chamber from a moment when the pressure in the pressure chamber is increased by the ejection pulse, and the non-ejection signal has a waveform including only a non-ejection pulse including a part for reducing the pressure in the pressure chamber and a part for increasing the reduced pressure in the pressure chamber, not to cause a droplet of the ink to be ejected from the nozzle.03-03-2011
20090033698HEAD DRIVE APPARATUS OF INK JET PRINTER, HEAD DRIVING METHOD, AND INK JET PRINTER - With an appropriate signal transmission form, a drive pulse output circuit is mounted to an ink jet head, so that waveform distortion of an actuator drive pulse for jet of ink drops is inhibited or prevented. Modulated signal data in memory is read to output a modulated signal, which is power-amplified by a digital power amplifier. The amplified digital signal is smoothed to be output to an actuator as a drive pulse. As a result, the digital power amplifier having high amplification efficiency efficiently amplifies the power of the modulated signal, thereby eliminating the need to use a cooling unit. The drive pulse output circuit can be mounted to the ink jet heads, thereby shortening the transmission path of an actuator drive pulse, which inhibits or prevents any waveform distortion of the drive pulse. The transmission of the modulated signal data DATA is implemented with a low frequency.02-05-2009
20090096823Drop mass calibration method based on drop positional feedback - A method of compensating for changes in drop mass of drop emitted by at least one ink jet of an ink jet imaging device is provided. The method comprises identifying a drop placement position on an image receiving member of an ink jet imaging device for at least one ink jet of a print head. The identified drop placement position for the at least one ink jet is compared to a default drop placement position for the at least one ink jet to determine a difference in drop placement position. A drive signal for the at least one ink jet is then adjusted in accordance with the difference in drop placement position.04-16-2009
20130010019INK JET PRINTING HEAD, INK JET PRINTING DEVICE, AND INK JET PRINTING HEAD MANUFACTURING DEVICE - An ink jet printing head includes a head portion, an ink tank, a first rigid circuit board, a second rigid circuit board, a flexible printed circuit board, and a connector. The connector is disposed on a top surface of the ink tank, the first rigid circuit board is disposed on a side of the ink tank, the second rigid circuit board is disposed between the ink tank and the head portion, and the flexible printed circuit board is disposed in a bent condition between the first rigid circuit board and the second rigid circuit board.01-10-2013
20130010020LIQUID APPLICATION APPARATUS, LIQUID APPLICATION METHOD AND IMPRINTING SYSTEM - A liquid application apparatus includes: a head including a plurality of nozzles which eject droplets of liquid having functional properties toward a substrate; a relative movement device which causes the head and the substrate to move relatively to each other in a relative movement direction; a droplet ejection control device which operates the head at a prescribed droplet ejection period so as to deposit the droplets discretely onto the substrate; an x-direction droplet deposition pitch changing device which changes a deposition pitch of the droplets on the substrate in an x direction perpendicular to the relative movement direction; and a y-direction droplet deposition pitch changing device which changes a deposition pitch of the droplets on the substrate in a y direction parallel to the relative movement direction.01-10-2013
20110316915LIQUID EJECTING APPARATUS AND METHOD OF CONTROLLING SAME - The driving signal generation circuit generates a first driving signal which includes a first ejection driving pulse in a unit period and a second driving signal which includes a second ejection driving pulse which is generated before the first ejection driving pulse in the unit period. The printer controller and the head control section correct the waveform of either one of the first ejection driving pulse or the second ejection driving pulse in accordance with a temperature that is detected by the temperature sensor.12-29-2011
20110316916LIQUID EJECTING APPARATUS AND METHOD OF CONTROLLING SAME - A liquid ejecting apparatus includes a recording head that has a first column of nozzles, in which nozzles that eject dye ink are provided in line in a sub-scanning direction intersecting a main scanning direction of the recording head and recording paper, and a second column of nozzles, in which nozzles that eject pigment ink are provided in line in parallel to the first column of nozzles, which are disposed side by side in the main scanning direction. The liquid ejecting apparatus also includes a control section that adjusts an ejection amount of at least one of the dye ink and the pigment ink by changing a driving signal in accordance with the landing sequence of the dye ink and the pigment ink on the recording paper.12-29-2011
20110157268PRINTING APPARATUS, PRINTING METHOD, PROGRAM AND PRINTING SYSTEM - A printing apparatus is provided with (A) a carry mechanism that carries a medium along a predetermined direction, (B) a nozzle that performs a moving and ejecting operation for ejecting ink toward the medium while moving relatively with respect to the medium during an interval of a carry operation by the carry mechanism, and (C) a signal output section that outputs a first timing defining signal defining a periodical timing for ejecting ink from the nozzle toward a position corresponding to a pixel configuring an image to be printed, and a second timing defining signal defining a periodical timing for ejecting ink from the nozzle toward a position displaced from the position corresponding to a pixel configuring an image to be printed, wherein the signal output section outputs either the first timing defining signal or the second timing defining signal for each moving and ejecting operation.06-30-2011
20120044288RECORDING APPARATUS AND RECORDING METHOD - A recording apparatus drives a recording element to perform recording on a recording medium. The recording apparatus includes: a drive waveform data acquisition device configured to acquire drive waveform data which contain waveform value information for a plurality of predetermined periods of time of a drive waveform for driving the recording element and contain identification information of the drive waveform data embedded in at least two pieces of the waveform value information; an identification information analysis device configured to extract the identification information from the drive waveform data and to interpret the extracted identification information; a waveform generation device configured to receive the waveform value information for each of the predetermined periods of time of the drive waveform data and to generate the drive waveform according to the received waveform value information, the waveform value information for the predetermined periods of time of the drive waveform data being sequentially inputted to the waveform generation device; and a drive device configured to drive the recording element according to the drive waveform generated by the waveform generation device.02-23-2012
20120001970DROPLET EJECTION DEVICE AND DROPLET EJECTION METHOD - A droplet ejection device in which cavitation is prevented and droplets are favorably ejected includes a nozzle, a liquid chamber communicating with the nozzle and arranged to house a material solution supplied through a liquid supply channel, a piezoelectric vibrator provided to the chamber, and a control mechanism arranged to apply driving voltage to the vibrator, and is arranged to eject droplets of the liquid from the nozzle by increasing and decreasing a volume of the chamber by the vibrator that is deformed in accordance with the voltage that is applied from the control mechanism, wherein the control mechanism is arranged to change the voltage, which is applied to the vibrator when the volume of the chamber is increased so as to suck the liquid into the chamber from the supply channel, in stages such that the volume of the chamber is increased in a plurality of stages.01-05-2012
20120001971INKJET RECORDING APPARATUS AND CONTROL METHOD OF THE INKJET RECORDING APPARATUS - An inkjet recording apparatus includes a heating unit configured to produce thermal energy for discharging ink, and two electrodes which electrically connect with each other through the ink. Voltage is applied between the two electrodes, and a current value flowing through the ink is measured. Whether the ink is discharged or not is determined by determining whether the current changes when the heating unit is driven.01-05-2012
20110096113IMAGE FORMING DEVICE AND PRINTED MATTER - In an image forming device including a liquid discharge head in which nozzles for discharging liquid drops are arranged side by side, a drive waveform generating unit generates, within a single drive cycle, a first drive waveform containing a drive signal to discharge an amount of liquid drop used for image formation, and a second drive waveform containing a drive signal to discharge an amount of liquid drop smaller than a minimum discharge drop amount used for image formation. A head control unit causes the liquid discharge head to discharge the amount of liquid drop used for image formation in accordance with the first drive waveform for a region where an image is formed, and to discharge the amount of liquid drop smaller than the minimum discharge drop amount in accordance with the second drive waveform for a region where any image is not formed.04-28-2011
20110096112LIQUID EJECTING APPARATUS AND METHOD OF CONTROLLING LIQUID EJECTING APPARATUS - The ejection driving pulse is a voltage waveform including: a first variation section; a hold section; and a second variation section. The second variation section includes: a first variation component in which the potential is varied in the second direction from the termination potential of the first variation section; an intermediate hold component in which the termination potential of the first variation component holds for a given time; and a second variation component in which the potential is varied in the second direction from the termination potential of the first variation component. The potential of the intermediate hold component is in the range from 50% to 60% of the potential of the hold section. A potential inclination of the second variation component is steeper than a potential inclination of the first variation component.04-28-2011
20110096111LIQUID EJECTING APPARATUS AND METHOD OF CONTROLLING LIQUID EJECTING APPARATUS - A potential inclination of the second variation component in the liquid-kind ejection pulse of the first signal is gentler than a potential inclination of the first variation component. A potential inclination of the second variation component in the liquid-kind ejection pulse of the second signal is steeper than the potential inclination of the first variation component. A ratio of the potential of the intermediate hold component to the potential of the hold section is larger in the liquid-kind ejection pulse of the second signal than in the liquid-kind ejection pulse of the first signal.04-28-2011
20080284806METHOD OF TESTING INKJET HEAD, TESTING SYSTEM, AND INKJET PRINTER - A testing method includes sorting inkjet heads into a plurality of groups on the basis of known information about ink flow, preparing basic driving waveform data corresponding to each of the groups and modification data that partially modifies the basic driving waveform data to individually store them in advance in a storing section, creating individual waveform information that instructs combinations of the basic driving waveform data with the modification data with respect to an inkjet head to be tested to apply a modified driving waveform, and repeating the modification of the individual waveform information until a recording state becomes good.11-20-2008
20120206518LIQUID EJECTING DEVICE, INSPECTION METHOD, AND PROGRAM - A liquid ejecting device ejects a liquid using a driving element driven through application of a drive signal. The liquid ejecting device comprises a detector electrically connected to a plurality of driving elements via a common electrical path. The detector detects electrical signals output from each of the plurality of driving elements.08-16-2012
20120044289Drop Mass Calibration Method Based on Drop Positional Feedback - A method compensates for changes in drop mass of drops ejected by ink jets in a printhead of an ink jet imaging device. The method comprises identifying an average drop placement position for a printhead with reference to ink drop positions on an image receiving member and adjusting a parameter of one or more ink jet driving signals in response to the average drop placement position being greater than a predetermined threshold.02-23-2012
20120105526Using light-scattering drop detector to determine turn-on-energy for fluid-ejection nozzle - For each energy value of a number of energy values, the energy value is applied to cause a fluid-ejection nozzle to eject a fluid drop. After the energy value has been applied to the fluid-ejection nozzle, a velocity of the fluid drop is determined using a light-scattering drop detector of the fluid-ejection device. A turn-on-energy (TOE) for the fluid-ejection nozzle is determined based on at least the velocities of the fluid drops determined after applying the energy values to the fluid-ejection nozzle.05-03-2012
20120206519INKJET PRINTING APPARATUS AND INK EJECTION CONTROL METHOD - For a temperature adjustment process that uses high viscosity ink and is based on a first table, in a low temperature environment, an ink refill failure may occur and lower density may appear in high duty printing. Also for a temperature adjustment process that uses high viscosity ink and is based on second and third tables, in a low temperature environment, an ink refill failure may occur and lower density may appear. On the other hand, for a temperature adjustment process that employs a fourth table, a smaller pre-heat pulse width than that for the first table, for the conventional temperature adjustment, is employed in the same low temperature environment. Therefore, an ink refill failure does not occur, and horizontal or vertical gaps do not appear during high duty printing.08-16-2012
20090244134LIQUID DROPLET DISCHARGING APPARATUS, LIQUID DISCHARGING METHOD, COLOR FILTER PRODUCING METHOD, AND ORGANIC EL DEVICE PRODUCING METHOD - A liquid droplet discharging apparatus includes a substrate having a plurality of film formation regions; a plurality of nozzles discharging droplets of a liquid, the nozzles being positioned facing the substrate and moved relatively with respect to the substrate to perform a scanning operation so as to discharge the droplets in the film formation regions during the scanning operation; a first moving mechanism moving the substrate relatively with the nozzles in a first direction; a plurality of driving units provided, each corresponding to one of the nozzles; a nozzle driving section generating a plurality of driving signals to supply one of the driving signals changing amounts of the droplets to be discharged to the driving units so as to allow the droplets to be discharged from the nozzles; and a control section controlling the first moving mechanism to allow the scanning operation to be performed a plurality of times over a same film formation region and controlling the nozzle driving section to allow a predetermined amount of the liquid to be discharged as droplets in the same film formation region during the plurality of times of the scanning operations and to change the driving signal applied to the driving units corresponding to nozzles positioned over the film formation region among the nozzles in each of the scanning operations.10-01-2009
20120062632PRINTHEAD WITH CONTROLLER FOR GENERATING COMBINED PRINT DATA AND CLOCK SIGNAL - An inkjet printhead that has a support member, and a plurality of printhead IC's mounted adjacent each other on the support member. Each of the printhead IC's has an array of nozzles for ejecting drops of printing fluid onto a media substrate, and drive circuitry for driving the array of nozzles. A print engine controller (PEC) sends print data to each of the printhead IC's and the drive circuitry extracts a clock signal from the data transmission from the PEC.03-15-2012
20120062630IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND RECORDING MEDIUM - An image forming apparatus includes a driving part driving a recording head; a signal generation part generating a common driving signal; and a transfer part transferring image data and control data to the driving part. The driving part includes a storage part capturing mask pattern transfer data to mask a predetermined one or more of different driving signals of the common driving signal provided by the signal generation part, the mask pattern transfer data being included in the control data; and a latching part latching the mask pattern transfer data, generating a signal to mask the common driving signal, and selectively performing one of control operations other than latching on the stored mask pattern transfer data, based on the combination of the value of the mask pattern transfer data and the value of a mask pattern transfer clock signal, when the latching part is caused to enter a latching state.03-15-2012
20120062629Piezo-electric inkjet print head and apparatus for driving the print head - Disclosed herein are a piezo-electric inkjet print head and an apparatus for driving the print head. The piezo-electric inkjet print head includes: a pressure chamber; a piezo-electric actuator applying a driving force for discharging ink to the pressure chamber; and a pulse applying unit applying a driving pulse to the piezo-electric actuator. The exemplary embodiment of the present invention can obtain the stable discharge characteristics even at the time of discharging at a high frequency of 30 kHz or more by forming the driving waveform of the inkjet head under the condition of measuring the unique vibration period owned by the inkjet head and simultaneously generating constructive interference and destructive interference against the vibrations.03-15-2012
20110043559LOAD DRIVING CIRCUIT, LIQUID EJECTION DEVICE, AND PRINTING APPARATUS - A load driving circuit includes first storage elements charged by a power supply and a series storage element group constituting unit that switches the connection state between the first storage elements to constitute a series storage element group in which the first storage elements are connected in series. A second storage element charging unit charges a second storage element using the series storage element group. Switching is performed between first and second connection states to apply voltage to the load. In the first connection state, the charged second storage element and the series storage element group are connected to the load while the second storage element and the series storage element group are connected in series. In the second connection state, the series storage element group is connected to the load while the series connection between the second storage element and the series storage element group is broken.02-24-2011
20110043558DROPLET EJECTION DEVICE - There is provided a droplet ejection device including: a droplet ejection unit that successively ejects plural droplets within a pre-specified driving cycle and is capable of causing the plural droplets to aggregate and impact; and a control section that controls application to the droplet ejection unit of driving waveforms among plural driving waveforms that are each capable of ejecting a droplet from the droplet ejection unit, which are generated within the pre-specified driving cycle, such that the driving waveforms that are applied include at least one driving waveform generated at a pre-specified later period in the driving cycle.02-24-2011
20120120137LIQUID JET APPARATUS AND PRINTING APPARATUS - A liquid jet apparatus according to the present invention includes a drive circuit adapted to apply a drive signal to an actuator of a liquid jet head, and a power supply voltage control circuit adapted to control a power supply voltage to the drive signal to be a waveform voltage set previously based on a reference signal obtained from one of the drive signal and a signal in a generation stage of the drive signal,05-17-2012
20110090274LIQUID EJECTING APPARATUS AND CONTROL METHOD OF LIQUID EJECTING APPARATUS - The driving signal generation section is able to generate a first ejection drive pulse for ejecting the first liquid and a second ejection drive pulse for ejecting the second liquid. The control section forms a pre-dot group in advance on a landing target area of the first liquid in the ejection target by ejecting the second liquid on the basis of the second ejection drive pulse, and subsequently forms a pattern dot on the landing target area, on which the pre-dot group is formed, by ejecting the first liquid on the basis of the first ejection drive pulse. In the apparatus, a total length of the pre-dot group in a direction of the relative movement is longer than a total length of the pattern dot in the direction of the relative movement.04-21-2011
20110090273LIQUID EJECTION APPARATUS - A liquid ejection apparatus which, by applying a drive voltage waveform to a piezoelectric element which drives an ejection nozzle, ejects a liquid from the ejection nozzle. The apparatus includes a reference voltage generating unit which generates a plurality of reference voltages, a drive voltage waveform data storage unit classifies the drive voltage waveform as either a voltage increasing section, decreasing section, or holding section, and stores drive voltage waveform data including a required time of a waveform section configuring the drive voltage waveform, and a voltage, selected from the plurality of reference voltages for the waveform section. The apparatus also includes a drive voltage waveform application unit which, in accordance with information relating to an adjustment of the ejection amount of the liquid ejected from the ejection nozzle, changes the required time included in the drive voltage waveform data, and applies the drive voltage waveform to the piezoelectric element.04-21-2011
20110090272LIQUID EJECTING APPARATUS AND METHOD OF CONTROLLING LIQUID EJECTING APPARATUS - The ejection driving pulse is a voltage waveform including: a first variation section; a hold section; and a second variation section. The second variation section includes: a first variation; an intermediate hold component; and a second variation component. The hold time of the intermediate hold component is greater than 0 and 0.12 Tc or less. The potential of the intermediate hold component is in the range from 50% to 60% of the potential of the hold section.04-21-2011
20110102486LIQUID EJECTING APPARATUS AND LIQUID EJECTING PRINTING APPARATUS - A liquid ejecting apparatus includes: a Modulator that performs pulse modulation for a drive waveform signal that becomes a reference for a drive signal of an actuator so as to acquire a modulated signal; a digital power amplifier that amplifies the power of the modulated signal so as to acquire a amplified digital signal; a low pass filter that smoothes the amplified digital signal so as to acquire the drive signal; a variable power source circuit that can change a power source voltage of the digital power amplifier; and a power source voltage control unit that controls changes in the power source voltage in units of a driving pulse that configures the drive signal of the actuator and can independently drive the actuator.05-05-2011
20120120138CROSSTALK REDUCTION IN PIEZO PRINTHEAD - Crosstalk in a piezo printhead is reduced by selecting an actuation signal for a nozzle, determining a time delay and a pulse width extension based on adjacent actuation signals of adjacent nozzles, and applying the time delay and pulse width extension to the actuation signal.05-17-2012
20120120136CAPACITIVE LOAD DRIVING CIRCUIT, LIQUID EJECTING APPARATUS, AND MEDICAL APPARATUS - A modulated signal is generated by performing pulse modulation of a drive waveform signal that is a reference for a drive signal to be applied to a capacitive load, and the drive signal is generated by performing power amplification of the acquired modulated signal and then smoothing the power-amplified modulated signal. Then, negative feedback of the drive signal applied to the capacitive load is applied to the drive waveform signal that is the reference for the drive signal. At this time, a predetermined analog compensation process for smoothing gain characteristics in a frequency band included in the drive signal is performed for the drive signal, then the acquired signal is converted into a digital signal, and negative feedback of the digital signal is applied to the drive waveform signal.05-17-2012
20120212530LIQUID EJECTING APPARATUS AND METHOD OF CONTROLLING THE SAME - A piezoelectric element changes a pressure in a pressure chamber and ejects ink from nozzles. A driving signal generating section generates a driving signal that includes an ejection pulse PA and PB which eject ink to a piezoelectric element, and a first transition element between the ejection pulse PA and PB. A starting end and a terminal end of the ejection pulse PA are set to a reference electric potential VA, and a starting end and a terminal end of an ejection pulse PB are set to a reference electric potential VB. An electric potential difference between the reference electric potential VA and the lowest electric potential of the ejection pulse PA is smaller than an electric potential difference between the reference electric potential VB and a highest electric potential of the ejection pulse PB, and the reference electric potential VA is lower than the reference electric potential VB.08-23-2012
20100245423DROPLET EJECTING HEAD AND IMAGE FORMING DEVICE - There is provided a droplet ejecting head in which plural ejecting openings, that eject droplets onto a recording medium that is conveyed by a conveying unit that conveys the recording medium, are provided so as to be lined-up in a conveying direction of the recording medium onto which the droplets are ejected, and in an cross-conveying direction that crosses the conveying direction. The respective ejecting openings are arranged so as to become distances that are determined in accordance with timings at which the respective ejecting openings eject the droplets, an ejecting speed of the droplets, a conveying speed of the recording medium, and a radius of the drum, such that positions, in the conveying direction of the recording medium, at which the droplets ejected from the ejecting openings land, substantially coincide at all of the ejecting openings.09-30-2010
20100245425LIQUID EJECTING APPARATUS AND CONTROL METHOD OF THE SAME - A liquid ejecting apparatus includes a liquid ejecting head having a nozzle, a pressurizing chamber that communicates with the nozzle, and a pressurizing element that causes a pressure change in liquid within the pressurizing chamber, the liquid ejecting head being capable of ejecting liquid from the nozzle by operating the pressurizing element; and a driving signal generation unit that generates a driving signal including a driving pulse that drives the pressurizing element. The driving signal includes an ejection driving pulse that ejects a liquid droplet and a non-ejection driving pulse that drives the pressurizing element to a degree whereby a liquid droplet is not ejected. The ejection driving pulse is a pulse waveform having an expansion element that causes the pressurizing chamber to expand and retract a meniscus toward the pressurizing chamber and a constriction element that causes the pressurizing chamber expanded by the expansion element to constrict and push the meniscus in the direction of ejection. The non-ejection driving pulse is a pulse waveform having an expansion element that causes the pressurizing chamber to expand and retract the meniscus toward the pressurizing chamber, a holding element that holds the voltage at the end of the expansion element for a set amount of time, and a constriction element that causes the pressurizing chamber expanded by the expansion element to constrict and push the meniscus in the direction of ejection. When the length of time from the end of the constriction element in the ejection driving pulse to the beginning of the expansion element in the non-ejection driving pulse is taken as t, the lengths of time of the expansion element, holding element, and constriction element in the non-ejection driving pulse are taken as a, b, and c, respectively, and the inherent vibration cycle of the liquid within the pressurizing chamber is taken as Tc, t, a, b, and c are within the ranges defined by the following equations (1) through (3):09-30-2010
20100245424DRIVE CONTROL APPARATUS AND INK-JET PRINTER PROVIDED WITH THE SAME - A control circuit of a printer makes a signal selecting circuit select a connection signal of a checking circuit, and then make output, to one driver IC which detects a connection state with the control circuit. The control circuit outputs a selection signal which makes the signal selecting circuit select a temperature detection signal of a temperature sensor, and then make output, to the remaining driver ICs.09-30-2010
20120218332LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a mist collecting unit disposed outside an ink ejection region on a platen, where ink is ejected onto a recording paper from a recording head, in the movement direction of the recording head, the ink ejection region of the platen includes a conductive material and is set to have the same potential as nozzles, a nozzle formation surface, or ink in a pressure chamber, and the mist collecting unit is set to have a more negative polarity than the ink ejection region of the platen.08-30-2012
20120162296RECORDING APPARATUS - A recording apparatus includes a carriage carrying a recording head and being movably supported, the recording head being configured to eject liquid onto a recording medium, a plurality of driven units to be driven by a drive source that generates a driving force, a transmission-switching mechanism configured to switch between the driven units, a carriage locker configured to prevent and allow movement of the carriage, and a transmission-switching locker configured to prevent and allow switching between the driven units. Movement prevention by the carriage locker and switching prevention by the transmission-switching locker are in synchronicity, and movement allowance by the carriage locker and switching allowance by the transmission-switching locker are in synchronicity.06-28-2012
20120127225LIQUID EJECTION APPARATUS AND CONTROL METHOD THEREOF - A drive signal generating circuit of the liquid ejection apparatus may output a second drive signal including a first unit signal including a set of two ejection drive pulses, and a fine vibration drive pulse, and a second unit signal including a set of two ejection drive pulses; and at a steady speed area of the recording head, both the first unit signal and the second unit signal are output according to one timing signal while at an acceleration or deceleration area of the recording head, one first unit signal is output according to one timing signal.05-24-2012
20100238216Piezoelectric Actuator, Method Of Manufacturing Piezoelectric Actuator, Liquid Ejection Head, Method Of Manufacturing Liquid Ejection Head And Image Forming Apparatus - A piezoelectric actuator includes: a piezoelectric layer formed by a film formation method so as to have orientation in a prescribed orientation direction; and a pair of electrodes, disposed on a same surface which is substantially perpendicular to the orientation direction of the piezoelectric layer, for applying to the piezoelectric layer an electric field in a direction substantially perpendicular to the orientation direction.09-23-2010
20120212531LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a platen disposed with a gap from a nozzle plate of a recording head and supporting a recording medium in ejecting, and an platen application voltage generating unit generating an electric field having a direction different from an electric field generated between an individual external electrode of a piezoelectric vibrator and nozzles, between the nozzle plate and the platen, in which the intensity of the electric field generated by the applied-to-plate voltage generating unit is set in between the maximum electric field intensity and the minimum electric field intensity between the individual external electrode and the nozzles.08-23-2012
20110181644Method and Apparatus for Controlling Film Deposition - The disclosure relates to a method for depositing films on a substrate which may form part of an LED or other types of display. In one embodiment, the disclosure relates to an apparatus for depositing ink on a substrate. The apparatus includes a chamber for receiving ink; a discharge nozzle having an inlet port and an outlet port, the discharge nozzle receiving a quantity of ink from the chamber at the inlet port and dispensing the quantity of ink from the outlet port; and a dispenser for metering the quantity of ink from the chamber to the inlet port of the discharge nozzle; wherein the chamber receives ink in liquid form having a plurality of suspended particles and the quantity of ink is pulsatingly metered from the chamber to the discharge nozzle; and the discharge nozzle evaporates the carrier liquid and deposits the solid particles on the substrate.07-28-2011
20110181643WIRING CONNECTION STRUCTURE OF DRIVER IC AND LIQUID DROPLET JETTING APPARATUS - A wiring connection structure of driver IC is provided. The wiring connection structure includes: a driver IC installed on a wiring substrate; output wires connected to output terminals of the driver IC; input wires including multiple kinds of signal input wires for transmitting multiple kinds of signals different from each other in susceptibility to an influence of noise; and bonding wires which connect input terminals of the driver IC to connection terminals of the input wires, and have an identical length to each other and a different loop height from the wiring substrate. The intervals between the input terminals are narrower than those between the connection terminals, and the loop height is higher with respect to the bonding wire connected to the connection terminal of the signal input wire for transmitting a signal more susceptible to the influence of noise.07-28-2011
20120212532Means For Higher Speed Inkjet Printing - A method and apparatus for subdividing and printing regions of a substrate with multiple print heads or multiple print head assemblies which substantially decreases printing time is described. The method includes a feathering method which reduces overlap artifacts which is useful in any printing situation where adjacent regions are printed that could be misaligned, offset, or have slightly different colors.08-23-2012
20120212529NOZZLE STATE DETECTING APPARATUS AND IMAGE FORMING APPARATUS - A plurality of transmission gates provided in mask circuits each having another transmission gate which connects/disconnects an original signal generating circuit to/from a corresponding piezoelectric element (electrode), and a plurality of voltage waveform detecting circuits respectively connected to the electrodes of the respective piezoelectric elements via the former transmission gates are provided exclusively for the respective piezoelectric elements. In detecting an ejection failure of each nozzle, the original signal generating circuit generates a test drive signal enough to prevent each nozzle from ejecting ink to switch all the latter transmission gates on for a certain time, and then switch them off, and switch all the former transmission gates on, so that an ejection failure of the corresponding nozzle is determined based on the vibration period of a voltage waveform detected by the voltage waveform detecting circuit for each piezoelectric element.08-23-2012
20120133693DISCHARGE ENERGY RECOVERY DEVICE AND IMAGE FORMING APPARATUS USING SAME - A discharge energy recovery device to recover discharge energy discharged from a piezoelectric element when the piezoelectric element is driven includes a drive voltage generator to generate a voltage to drive the piezoelectric element; a discharge voltage monitoring unit to monitor a voltage discharged from the piezoelectric element when the piezoelectric element is driven; a first current supplier to supply a current energy to operate a first load circuit when the discharged voltage is equal to or greater than a first voltage that enables driving of the first load circuit, and a second current supplier to supply a current energy to operate a second load circuit when the discharged voltage is less than the first voltage and equal to or greater than a second voltage that enables driving of the second load circuit by monitoring the currently discharged voltage using the discharge voltage monitoring unit.05-31-2012
20120133692DISCHARGE ENERGY RECOVERY DEVICE AND IMAGE FORMING APPARATUS USING SAME - A discharge energy recovery device to recover discharge energy discharged from a piezoelectric element when the piezoelectric element is driven includes a drive voltage generator to generate a voltage to drive the piezoelectric element; a discharge voltage monitoring unit to monitor a discharge voltage discharged from the piezoelectric element when the piezoelectric element is driven by the drive voltage generator; a plurality of charge accumulating devices to accumulate a charge corresponding to a voltage monitored by the discharged voltage discharge voltage monitoring unit; and a selection unit to select one or more charge accumulating devices from the plurality of charge accumulating devices having capacity sufficient to enable accumulation of the charge corresponding to the voltage monitored by the discharge voltage monitoring unit.05-31-2012
20080211847SYSTEMS AND METHODS FOR CONTROLLING AND TESTING JETTING STABILITY IN INKJET PRINT HEADS - The present invention provides systems, methods, and apparatus for monitoring and controlling a slew rate of a voltage signal provided to a PZT capacitor of a print head. The system includes a digital driver circuit adapted to generate a signal indicating a nominal slew rate, a probe circuit for measuring a firing pulse voltage signal provided to the capacitor, a comparator coupled to the digital driver and the probe circuit comparing a measured slew rate with the nominal slew rate generating a signal indicating a difference between the measured slew rate and the nominal slew rate, an analog driver circuit coupled to the comparator adapted to adjust the slew rate of the voltage signal in response to the difference signal, and an analog/digital converter adapted to sample the voltage signal output from the probe circuit and to provide an output for diagnostic purposes. Numerous other features and aspects are disclosed.09-04-2008
20120075371METHOD TO CONTROL A PRINTING PROCESS IN AN INKJET PRINTING APPARATUS, AND PRINTING APPARATUS TO EXECUTE SUCH A METHOD - In a method or apparatus for controlling a printing process in an inkjet printing apparatus that has multiple print heads, a line scan is generated to print a print line on a recording material. The individual print heads are individually controlled with an offset relative to the line scan to eject printing ink, print data prepared for the printing being stored in a memory device upstream of the print heads. Print data units to be printed by the print heads are transferred from the memory device to the respective print heads in a same order with which they are printed. The order with which the print data units are transferred is controlled by request commands entered into a FIFO memory, each request command identifying a print head in the order of the transfer of the print data units corresponds to an order of the request commands in the FIFO memory.03-29-2012
20120075370System And Method To Compensate For An Inoperative Inkjet In An Inkjet Printer - An inkjet printer has been developed, which identifies one or more printing metrics and selects a corrective operation for image data. After application of the corrective operation to image data, firing signals are generated with reference to the modified image data to compensate for an inoperative inkjet in a printhead of the inkjet printer.03-29-2012
20100271412INKJET PRINTER - A inkjet printer including a plurality of heads installed in a staggered arrangement, and a relay board for receiving image data, a control signal conforming to each head, and a timing signal for determining timed intervals to emit ink particles from the control unit of the inkjet printer, and for sending the received image data, control signal and timing signal to the aforementioned plurality of respective drive signal generating circuits.10-28-2010
20120249639LIQUID EJECTING APPARATUS AND METHOD OF CONTROLLING THE SAME - A temperature sensor provided to a recording head detects a temperature when the recording head relatively moves outside an opposite region opposite to a platen heater. A driving signal generating circuit compensates an ejection pulse in accordance with the detected temperature.10-04-2012
20120249637INKJET HEAD DRIVE METHOD AND INKJET HEAD DRIVE DEVICE - An inkjet head driving method is a method for driving an inkjet head having a property in which heat is generated when a drive waveform is applied to a piezoelectric element section connected to a plurality of discharge nozzles. Based on drawing data, a discharge waveform, which is a drive waveform that causes discharging of ink, is applied to a driven nozzle for discharging the ink in a predetermined drive cycle, and a non-discharge waveform, which is a drive waveform that does not cause discharging of the ink, is applied to a non-driven nozzle other than the driven nozzle in the predetermined drive cycle.10-04-2012
20120249636NOZZLE DISCHARGE QUANTITY CORRECTION METHOD, DROPLET DISCHARGING METHOD, AND ORGANIC EL DEVICE MANUFACTURING METHOD - A nozzle discharge quantity correction method includes performing correction quantity calculation as the number of the nozzle array units in stages such that a total sum C of the weight of droplets in nozzle array units after correction and the weight of the droplets in other nozzle array units in which discharge is performed on the discharge region becomes a previously set predetermined quantity B based on the difference between the total sum A of the weight of all the droplets discharged to a discharge region when the weight of the droplets discharged from a nozzle are not corrected and the predetermined quantity B.10-04-2012
20120249635LIQUID DISCHARGE HEAD AND LIQUID DISCHARGE APPARATUS - A liquid discharge head includes a signal processing circuit which operates with a first voltage, and generates a discharge control signal, a liquid driving circuit including an electrothermal transducer, a driving element which drives the electrothermal transducer, and a control circuit which receives the discharge control signal and outputs, to the driving element, a driving signal having a second voltage higher than the first voltage, and a monitoring circuit which monitors the first voltage and outputs a stop signal upon a drop of the first voltage. The control circuit stops driving the electrothermal transducer by the driving element in accordance with the stop signal. The monitoring circuit includes a transistor including a drain connected to power supply voltage node through a step-down circuit, a source connected to ground side, and a gate receiving the first voltage.10-04-2012
20120249638LIQUID EJECTING APPARATUS AND CONTROL METHOD THEREOF - A liquid ejecting apparatus includes: a liquid ejecting head, having a pressure chamber filled with a liquid, and a pressure generation element that causes the pressure of the liquid within the pressure chamber to fluctuate that ejects the liquid from a nozzle based on the pressure fluctuation in the liquid within the pressure chamber; a driving waveform generation unit that generates a driving waveform for ejects the liquid; a control unit that causes the liquid ejecting head to execute a flushing operation that discharges the liquid within the pressure chamber; and a residual vibration detection unit that detects a residual vibration in the liquid within the pressure chamber. The control unit calculates a characteristic value in accordance with a characteristic of the liquid based on the residual vibration produced by the flushing operation, and corrects the driving waveform based on the characteristic value.10-04-2012
20090073205INKJET APPARATUS AND CALIBRATION METHODS THEREOF - An Inkjet apparatus is provided. An Inkjet apparatus includes a piezoelectric inkjet print head, a plurality of driving unit, a detection unit and a control unit. The piezoelectric inkjet print head comprises a plurality of nozzles, wherein each the nozzle outputs an ink drop according to a driving voltage. The driving unit generates the driving voltage according to a control signal. The detection unit detects a state of the ink drop corresponding to the nozzle to generate a detection signal. The control unit generates the control signal to control the driving voltage according to the detection signal.03-19-2009
20090073206 METHOD FOR OBTAINING AN IMAGE WITH AN INK JET PRINTER AND A PRINTER SUITABLE FOR PERFORMING THAT METHOD - A method obtains an image from multiple ink droplets transferred to a receiving substrate using an ink jet printer including a plurality of ink chambers operatively filled with ink. Each ink chamber has a nozzle and a corresponding transducer. The ink chambers have mutually distinguishable acoustics. The method includes, for the respective ink chambers, generating an electrical pulse, applying the pulse to the transducer corresponding to a respective ink chamber in order to generate a pressure wave in the ink, such that a droplet of the ink is jetted out of the nozzle at a speed corresponding to the pressure wave, and adjusting the pulse to the acoustics of the respective ink chamber such that the speed at which the droplet is jetted is essentially the same for each ink chamber. A printer is configured for application of the method.03-19-2009
20100265290RECORDING APPARATUS - A record head has an actuator which is selectively switchable between a small-capacity state in which the capacity of a pressure chamber connected to an outlet is V10-21-2010
20090309909NOZZLE ARRANGEMENT WITH FULLY STATIC CMOS CONTROL LOGIC ARCHITECTURE - A nozzle arrangement for a pagewidth inkjet printhead assembly. The nozzle arrangement includes a substrate defining an ink supply channel; an ink chamber in fluid communication with the ink supply channel, the ink chamber defining an ink ejection port around which an ink spreading prevention rim is provided; a thermal actuator mechanism arranged in the substrate and configured to eject ink from the chamber via the ejection port, the mechanism having a thermal actuator arm adapted to deflect as a result of relative thermal expansion; and control logic architecture provided on the substrate for controlling the thermal actuator arm. The architecture has a plurality of successive shift registers, a transfer register for receiving data output from a last shift register, and a firing control gate. The firing control gate has an enabling input and a gate data input for receiving an output from the transfer register. The gate operatively drives the thermal actuator according to the enabling and gate data inputs. The shift register and transfer register are provided as fully static CMOS.12-17-2009
20120223985INK-JET DEVICE - Disclosed is an ink-jet device applicable to various ink-jet equipments. The device includes an ink reservoir, an ink chamber, pressure generating units and an ink-jet head. The ink-jet head has dielectric layers coated on an inner surface and an outer surface thereof. By applying a voltage to the dielectric layers, the dielectric layers are changed to be hydrophobic or hydrophilic, so as to reduce residual ink accumulated in the ink-jet head during the ink-jetting process, hence improving ink-jetting accuracy.09-06-2012
20120188300LIQUID EJECTING APPARATUS - The driving signal includes a first element that pressurizes the pressure chamber and that makes the liquid in the nozzle protrude to form a liquid pillar, and a second element that pressurizes the pressure chamber after the first element and that makes a portion of a liquid surface of the liquid, the portion being other than a surface of the liquid pillar, protrude from a position where the liquid surface in the nozzle is in contact with an inner surface of the nozzle, in a direction in which the liquid pillar protrudes, in a state where the liquid pillar has not yet separated from the liquid in the nozzle.07-26-2012
20120081431LIQUID EJECTING APPARATUS - A piezoelectric vibrator varies the pressure in a pressure chamber in accordance with a drive signal, whereby ink contained in the pressure chamber is ejected from a nozzle. The drive signal includes a slight-vibration pulse used to change the pressure in the pressure chamber to an extent that the ink is not ejected. The slight-vibration pulse includes a first changing component in which the potential changes from a reference potential in a negative direction in which the pressure in the pressure chamber is increased by the piezoelectric vibrator, a second changing component which is generated to follow the first changing component and in which the potential changes so as to cross the reference potential in a positive direction, and a third changing component which is generated to follow the second changing component and in which the potential changes to the reference potential in the negative direction.04-05-2012
20120081430LIQUID EJECTING APPARATUS AND CONTROLLING METHOD THEREOF - Two ink droplets are coupled in the air before landing on a recording paper sheet. Referring to most closely located two nozzle rows, a driving signal including a first driving pulse and a second driving pulse is provided to an actuator corresponding to a nozzle in one of the nozzle rows. At the same time, a driving signal including a micro vibration pulse is provided to an actuator of another nozzle in the other nozzle row and closest to the former nozzle even when an ink droplet is not to be dispensed through the latter nozzle, so that a crosstalk takes place.04-05-2012
20120081429METHOD OF PRINTING AT DOT DENSITY EXCEEDING NOZZLE DENSITY IN STATIONARY PAGEWIDTH PRINTHEAD - A method of printing at a dot density exceeding a nozzle density in a stationary pagewidth printhead. The method includes the steps of: (i) advancing a print medium transversely past the stationary printhead at a rate of one line per one line-time; and (ii) firing droplets of ink from predetermined nozzles in a nozzle row to create successive lines of print. Some or all of the predetermined nozzles fire droplets of ink at a plurality of predetermined different dot positions along a longitudinal axis of the printhead during one line-time, such that the printed dot density in each line of print exceeds the nozzle density.04-05-2012
20120262511LIQUID DISCHARGING APPARATUS, INSPECTION METHOD, AND MEDIUM HAVING RECORDED PROGRAM - A printer has a plurality of dischargers for discharging ink, a detector for detecting an electric signal SW, and an inspector unit for inspecting the dischargers on the basis of the electric signal SW; and a grounding terminal connecting a drive element of a discharger being inspected is electrically disconnected from another grounding terminal and a grounding line GL when the electric signal SW is detected by the detector.10-18-2012
20120229541IMAGE FORMING DEVICE - An image forming device includes a liquid discharge head including piezoelectric elements; a drive waveform generating unit that outputs a drive waveform; a selection unit that applies the drive waveform to the piezoelectric elements; a resonant frequency adjusting circuit that is connected in parallel with the piezoelectric elements; a switch unit that switches the resonant frequency adjusting circuit; and a switching control unit that causes the switch unit to switch in accordance with a first number of simultaneously driven piezoelectric elements. When the first number of the simultaneously driven piezoelectric elements is greater than a predetermined number, the switching control unit connects the resonant frequency adjusting circuit, so that a resonant frequency of a closed loop becomes lower than a resonant frequency of the closed loop when the first number of the simultaneously driven piezoelectric elements is less than the predetermined number.09-13-2012
20120229542INKJET HEAD AND INKJET PRINT DEVICE - An inkjet head includes a nozzle plate having a plurality of nozzle holes to eject ink droplets, a plurality of ink chambers in which ink is filled, partitioned by sidewalk in communication with the nozzle holes, a plurality of electric conversion elements to generate energy to the ink in the ink chambers for ejecting the ink droplets from the nozzle holes, and an ink chamber plate on which a plurality of drive circuits are mounted to apply a drive voltage to each of the electric conversion elements. Each of the drive circuits includes, on a side face having a pair of long sides and a pair of short sides, drive voltage terminals arranged along one long side to apply the drive voltage to the electric conversion elements via a wiring, input terminals arranged near one short side to which control signals are input, and output terminals arranged near the other short side to output all the control signals.09-13-2012
20120229544RECORDING APPARATUS - A recording apparatus includes: a recording head having a recording element row in which multiple recording elements are disposed, with recording elements at dispersed positions in the recording element rows as blocks; a scanning unit configured to scan the recording head in a main scanning direction; a time-division driving unit configured to drive the recording elements in increments of blocks; a storing unit configured to store recording data; an obtaining unit configured to obtain information relating to the inclination of the recording element row relative to the main scanning direction; and a changing unit operable to change, in increments of individual recording elements, the storage position in the main scanning direction of recording data stored in the storing unit that is to be provided to recording elements of a group, which is configured of consecutive recording elements in each block in the recording element row, based on the obtained information.09-13-2012
20110122182DRIVING DROP EJECTORS - Methods, systems, and apparatus, for drop ejection, specifically, for driving drop ejectors using n-type double-diffused metal oxide semiconductor (NDMOS) transistors with sputtered piezoelectric transducers. In general, in one aspect, an apparatus includes a n-type double-diffused metal oxide semiconductor transistor. The apparatus also includes a piezoelectric transducer. A first surface of the piezoelectric transducer is coupled to the n-type double-diffused metal oxide semiconductor transistor. The apparatus also includes a first waveform generator configured to generate an ejector waveform to apply to a second surface of the piezoelectric transducer. The ejector waveform includes at least a positive pulse and a negative pulse. The apparatus also includes a second waveform generator configured to generate a control waveform to apply to the n-type double-diffused metal oxide semiconductor transistor to selectively actuate the piezoelectric transducer.05-26-2011
20100328380FLUID EJECTION DEVICE AND FLUID EJECTING RECORDING DEVICE - A fluid ejection device includes, a modulator, a digital power amplifier, a low pass filter, and an inverse filter circuit, including, a delay device, a subtracter that subtracts an output signal of the delay device from a drive waveform signal, an amplifier adapted to amplify an output signal of the subtracter, an adder that adds an output signal of the amplifier and another input signal, a first switch adapted to perform switching so as to set either one of the drive waveform signal and an output signal of the adder to be an input signal of the delay device, a second switch adapted to perform switching so as to set either one of the drive waveform signal and the output signal of the delay device to be the another input signal of the adder, and a switch connection control section that controls the first switch and the second switch.12-30-2010
20100328379FLUID EJECTION DEVICE AND FLUID EJECTION PRINTER - A fluid ejection device includes: a modulator adapted to pulse-modulate a drive waveform signal forming a basis of a drive signal of an actuator to obtain a modulated signal; a digital power amplifier circuit adapted to power-amplify the modulated signal to obtain a power-amplified modulated signal; a low pass filter adapted to smooth the power-amplified modulated signal to obtain the drive signal; and a power amplification stopping section operating when holding a voltage of the actuator constant.12-30-2010
20110037796COMPACT NOZZLE ASSEMBLY OF AN INKJET PRINTHEAD - A nozzle assembly for an inkjet printhead is disclosed. The nozzle assembly includes an inkjet nozzle having an actuator for ejecting an ink droplet from the inkjet nozzle when a resistive element of the actuator is heated by an electrical current, a shift register comprising a plurality of successive registers, the shift register receives input data in a first register, and shifts the input data to successive registers upon receipt of a shift signal, a transfer register for latching data in one of the registers of the shift register; a control gate for outputting a control pulse in response to data in the transfer register, and a drive transistor for providing an energy pulse to the resistive element of the actuator upon receipt of the control pulse. The nozzle assembly covers an area of less than 20,000 square microns.02-17-2011
20110037795FLUID EJECTION METHOD AND FLUID EJECTION DEVICE - A fluid ejection method includes: supplying fluid at a predetermined fluid supply flow rate to a pressure chamber; generating a pulsed flow by varying the volume of the pressure chamber at a predetermined frequency; and ejecting the pulsed flow, wherein the fluid supply flow rate is proportional to the frequency.02-17-2011
20120268511LIQUID EJECTION HEAD AND METHOD OF DRIVING THE SAME - A liquid ejection head includes a plurality of ejection orifices, liquid chambers, piezoelectric actuators, and driving units, and a control unit. Each ejection orifice ejects liquid, each liquid chamber communicates individually with an ejection orifice, each piezoelectric actuator is disposed individually for a liquid chamber and generates energy to eject liquid, and each driving unit individually drives a piezoelectric actuator. The control unit controls each driving unit to output a first voltage pulse to eject liquid or a second voltage pulse to vibrate a meniscus of liquid in a state in which the meniscus is held in a liquid chamber. The control unit selects ejection orifices used to eject liquid and controls to output the first voltage pulse to them, and selects ejection orifices not used to eject liquid and controls to output the second voltage pulse to them to perform respective concurrent recording and recovery operations.10-25-2012
20120268512IMAGE FORMATION APPARATUS - An image formation apparatus includes a dot formation element; a voltage signal generation circuit configured to generate a voltage signal by using an amplification circuit including a transistor, the voltage signal including a plurality of driving voltage pulses each thereof driving the dot formation element, and at least one temperature measurement voltage portion each thereof being provided between two successive ones of the driving voltage pulses; a temperature measurement control unit configured to measure a temperature of the transistor on the basis of the voltage signal; and a switch circuit configured to output the voltage signal to the dot formation element during a period when the transistor amplifies a signal corresponding to each of the driving voltage pulses, and output the voltage signal to the temperature measurement control unit during a period when the transistor amplifies a signal corresponding to each of the at least one temperature measurement voltage portion.10-25-2012
20120274690IMAGE FORMING METHOD, IMAGE FORMING APPARATUS AND INKJET HEAD - An image forming method for use in an inkjet head includes a pressure chamber filled with ink, a nozzle which communicates with the pressure chamber and in which a meniscus of the ink is formed, a piezoelectric element which pressurizes the pressure chamber, and a drive circuit which performs an operation of ejecting the ink in a printing state and generates a basic pulse for vibrating the meniscus in a non-printing state. The basic pulse is generated by turning off a voltage applied to the piezoelectric element for substantially the same period as a natural vibration period of the ink. An additional pulse is generated at least once before or after the basic pulse when the basic pulse is generated by the drive circuit in the non-printing state. The additional pulse is generated by turning off the voltage applied to the piezoelectric element.11-01-2012
20120327149INKJET RECORDING APPARATUS AND INKJET RECORDING METHOD - According to one embodiment, an inkjet recording apparatus includes a head body, electrodes, a nozzle plate and a control section. The control section is electrically connected to the electrodes and applies an ejection pulse or a non-ejection pulse to the electrodes. The ejection pulse includes a first voltage change process for increasing the volume of a pressure chamber and a second voltage change process for reducing the volume of the pressure chamber, has width equal to or larger than 0.95 times and equal to or smaller than 1.05 times of a pressure propagation time in the pressure chamber, and ejects the ink from a nozzle. The non-ejection pulse has width equal to or larger than 0.2 times and equal to or smaller than 0.34 times of the width of the ejection pulse and stops the ink in the nozzle.12-27-2012
20120327148LIQUID EJECTION APPARATUS - The liquid ejection apparatus includes a liquid ejection head, a drive unit, a non-ejection drive controller, and an environment measurement unit. The drive unit selectively supplies an ejection drive signal and a non-ejection drive signal to the actuator. The non-ejection drive controller causes the drive unit to supply the non-ejection drive signal to the actuator within a non-ejection drive period which is at the trailing end portion of the non-ejection period, when the non-ejection period satisfies the predetermined condition. The non-ejection drive controller controls the drive unit so that the length of a blank period is varied based on at least one of the temperature and the humidity measured by the environment measurement unit, the blank period being a period between a point of supplying a final non-ejection drive signal within the non-ejection drive period and the trailing end of the non-ejection period.12-27-2012
20120092401HEAD DRIVE DEVICE OF INKJET PRINTER AND INKJET PRINTER - A head drive of an inkjet printer includes nozzles and corresponding actuators that eject liquid ink drops. A drive unit applies a drive signal to the actuators. The drive unit includes a drive waveform generator that generates a drive waveform signal to control the drive of the actuators. A modulator pulse modulates the drive waveform. A digital power amplifier amplifies power of the modulated signal. A low pass filter smoothes the amplified digital signal and supplies the signal as a drive signal to the actuators. An inverse filter provided in a subsequent stage of the drive waveform generator corrects at least the frequency characteristics of the filter to predetermined frequency characteristics, independent of the number of the actuators to drive.04-19-2012
20130016145PRODUCING INK DROPS IN A PRINTING APPARATUSAANM Gerstenberger; Jeffrey S.AACI RochesterAAST NYAACO USAAGP Gerstenberger; Jeffrey S. Rochester NY USAANM Hadley; Keith A.AACI RochesterAAST NYAACO USAAGP Hadley; Keith A. Rochester NY USAANM Tang; ManhAACI PenfieldAAST NYAACO USAAGP Tang; Manh Penfield NY US - A method of producing ink drops (01-17-2013
20130016146DRIVING DEVICE FOR DRIVING LIQUID DELIVERY HEAD, RECORDING APPARATUS, AND RECORDING METHODAANM Hashiguchi; TakujiAACI Kyoto-shiAACO JPAAGP Hashiguchi; Takuji Kyoto-shi JP - A driving device, and a liquid discharge head and a recording apparatus using the driving device are provided which permit precise printing under various conditions. The driving device includes a latch signal generation circuit for generating a latch signal every Tc seconds; a delay time retention circuit for retaining data of delay times of less than Tc seconds; a plurality of first latch circuits which are capable of retaining one-line pixel data, and latch pixel data from outside by the latch signal; a plurality of second latch circuits which are divided into a plurality of second latch circuit groups, and latch pixel data retained in the plurality of first latch circuits after the delay time of data retained in the delay time retention circuit for each of the second latch circuit groups is passed after the latch signal is transmitted; and a driving signal transmission circuit.01-17-2013
20110261097DRIVER CIRCUIT FOR DRIVING A PRINT HEAD OF AN INKJET PRINTER - An inkjet printing apparatus includes a print head having an ink duct, a piezoelectric element operatively coupled to the ink duct, and a control device for controlling an ink drop ejection from the ink duct by actuation of the piezoelectric element. The control device includes a current source, a number of power supplies, and a switch, connected between the current source and the number of power supplies. The current source is configured to generate a current for actuating the piezoelectric element by charging and discharging. The switch is configured to connect the current source and one of the number of power supplies. The one of the number of power supplies is selected such that a lowest voltage difference over the current source exists.10-27-2011
20130201233System And Method For Compensating For Drift In Multiple Printheads In An Inkjet Printer - A method for calibrating in situ a plurality of printheads in an imaging device has been developed. Firing signals operate a plurality of printheads to form ink test patterns on an image receiving member. Reflectance measurements of light reflected from the test patterns and optical density measurements for a portion of the patterns formed by only one printhead in the plurality of printheads are used to adjust the firing signals and enable the printheads to print within a predetermined range about an average reflectance value and a predetermined optical density.08-08-2013
20130176354METHODS OF DRIVING HYBRID INKJET PRINTING APPARATUS - A method of driving a hybrid inkjet printing apparatus includes applying an electrostatic voltage to ink contained in a nozzle, applying a waveform voltage to ink contained in the nozzle, the waveform voltage being applied by a piezoelectric driving device, and applying an ejection voltage so as to eject the ink.07-11-2013
20080218546Ink-jet printer - An ink-jet printer including: an ink-jet head in which are disposed a plurality of nozzles that are divided into a plurality of nozzle groups; a plurality of actuators which are provided to respectively correspond to the plurality of nozzles and which are divided into a plurality of actuator groups respectively corresponding to the plurality of nozzle groups; a plurality of drive circuits which are provided respectively for the plurality of nozzle groups and each of which outputs a drive signal used for ejecting an ink, to the plurality of actuators of a corresponding one of the plurality of actuator groups; a controller which controls the ink-jet printer to perform printing such that, by driving any of the plurality of actuators which are determined on the basis of print data, the ink is ejected, toward a recording medium, from any of the plurality of nozzles that correspond to said any of the plurality of actuators; and an adjusting portion which adjusts the drive signal to be outputted from each of the plurality of drive circuits to reduce variation in an ink-ejection property among the plurality of nozzle groups.09-11-2008
20080218545LIQUID JET APPARATUS AND PRINTING APPARATUS - A printing apparatus uses a liquid jet apparatus including a plurality of nozzles provided to a liquid jet head, an actuator provided corresponding to each of the nozzles, and drive unit that applies a drive signal to the actuator, wherein the drive unit includes drive waveform signal generation unit that generates a drive waveform signal providing a basis of a signal for controlling the actuator, feedback correction unit for feedback-correcting the drive waveform signal generated by the drive waveform signal generation unit, modulator unit for pulse-modulating the corrected drive waveform signal feedback-corrected by the feedback correction unit, a digital power amplifier for power-amplifying the modulated signal, which is pulse-modulated by the modulator unit, and a low-pass filter for smoothing the power-amplified and modulated signal power-amplified by the digital power amplifier and supplying the actuator with the power-amplified and modulated signal as the drive signal, and the feedback correction unit includes a virtual filter having an equivalent frequency characteristic to a frequency characteristic of a filter composed of the low-pass filter and capacitance of the actuator, and operation unit for feedback-correcting the drive waveform signal with a component of the drive waveform signal generated by the drive waveform signal generation unit and passing through the virtual filter.09-11-2008
20130093811LIQUID EJECTING APPARATUS AND METHOD FOR CONTROLLING LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a liquid ejecting head having a nozzle that ejects liquid and a pressure chamber in communication with the nozzle. A pressure generator causes pressure fluctuation in the liquid retained in the pressure chamber. The liquid ejecting head is capable of ejecting the liquid from the nozzle as a result of operation of the pressure generator. A driving signal generating section generates a driving signal having an ejection pulse for driving the pressure generator to eject the liquid from the nozzle. The ejection pulse is a voltage waveform four waveform portions having, respectively, voltage levels V04-18-2013
20130093810IMAGE FORMING DEVICE, AND IMAGE FORMING METHOD - An image forming device includes a head including a nozzle that discharges an electrically-conductive recording liquid in accordance with a driving signal; an intermediate transfer body on which the recording liquid discharged by the head is applied; a voltage apply unit that applies a voltage between the intermediate transfer body and the head, so as to decompose the electrically-conductive recording liquid by electrolysis; a transfer unit that transfers an image supported on the intermediate transfer body onto a recording material; and a discharging control unit that generates the driving signal that causes the electrically-conductive recording liquid to be discharged from the nozzle. The discharging control unit generates the driving signal so that a position of a meniscus is placed outside the nozzle during a time interval in which the recording liquid temporarily bridges between the head and the intermediate transfer body.04-18-2013
20130093809INKJET PRINTING APPARATUS AND INKJET PRINTING METHOD - There is provided an inkjet printing apparatus which can output a stable image without density unevenness by performing appropriate drive control to print elements based upon an appropriate representative temperature of a chip whatever image data is printed on a print medium. For this purpose, detection temperatures of a plurality of temperature sensors are lined up in high temperature order, and coefficients by which the respective detection temperatures are multiplied, are determined to be associated with that order at the lining-up, determining a representative temperature by the weighted average method. The common drive pulse associated with to the individual chip based upon the representative temperature thus obtained, to be applied thereto. Thereby even if temperature variations of print elements on the chip exist, it is possible to appropriately control the entire chip in temperature.04-18-2013
20130135372FLUID EJECTION DEVICE AND FLUID EJECTION PRINTER WITH A POWER AMPLIFIER STOPPING SECTION - A fluid ejection device includes: a modulator adapted to pulse-modulate a drive waveform signal forming a basis of a drive signal of an actuator to obtain a modulated signal; a digital power amplifier circuit adapted to power-amplify the modulated signal to obtain a power-amplified modulated signal; a low pass filter adapted to smooth the power-amplified modulated signal to obtain the drive signal; and a power amplification stopping section operating when holding a voltage of the actuator constant.05-30-2013
20100277528REPLACEABLE PRINT CARTRIDGE WITH AN OPTICAL SENSOR FOR RECEIVING PRINT DATA - A mobile telecommunications device is disclosed. The mobile telecommunications device has a body with a cradle formed therein, a print engine controller within the body, and a replaceable print cartridge received by the cradle. The print engine controller has a light emitting beacon for transmitting print data as an optical data signal. The print cartridge has a printhead with an array of nozzles for ejecting ink, a sensor for receiving the optical data signal from the light emitting beacon and converting the optical data signal into an electrical data signal, and print data circuitry for receiving the electrical data signal and for providing the nozzles with print data.11-04-2010
20080198191Liquid Jetting Device - A liquid jetting device comprises plural nozzles provided at a liquid jetting head, actuators provided in correspondence with the respective nozzles, and a drive section that applies a drive signal to each of the actuators of the nozzles from which liquid is to be jetted, the liquid jetting device comprising: a drive waveform generator that generates a drive waveform signal as a reference of a signal that controls a drive state of each of the actuators; a modulator that performs the pulse modulation of the drive waveform signal which has been generated at the drive waveform generator; a digital power amplifier that power-amplifies a modulated signal which has been caused to undergo the pulse modulation at the modulator; a low pass filter (LPF) that smoothes the amplified digital signal which has been power-amplified at the digital power amplifier to deliver the smoothed modulated signal thus obtained, as a drive signal, to each of the actuators; and a pulse modulation reference signal generating section that outputs, to the modulator, a pulse modulation reference signal that prescribes a pulse modulation timing of the drive waveform signal by the modulator.08-21-2008
20080198190Printing System for Triggering the Print Head of a Printer Cartridge - The invention relates to a printing system for controlling the printing head of a conventional printing cartridge designed for water-based printing ink. Said printing head comprises ink discharging elements arranged in a matrix, and the actuatable heating element of an ink discharging element is activated by means of an address signal operating as a line signal and by means of a starting signal operating as a column signal. The starting pulses of the starting signal (SS08-21-2008
20110273501LIQUID JET APPARATUS AND PRINTING APPARATUS - A liquid jet apparatus according to the present invention is a liquid jet apparatus including a plurality of nozzles, an actuator provided for each nozzle and connected to the respective nozzle, a drive waveform signal generation unit that generates a drive pulse, and a drive unit that applies the drive pulse to the actuator, wherein the drive unit includes a transistor pair, wherein the transistor pair: has two transistors connected to each other in a push-pull manner, and power-amplifies the drive pulse. The drive unit also includes a low-pass filter disposed between the transistor pair and the actuator.11-10-2011
20110273500LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a liquid ejecting head with a plurality of nozzle groups each having a plurality of nozzles. Each nozzle ejects a liquid onto a landing target by an ejection pulse applied to the liquid. A movement unit relatively moves the liquid ejecting head and the landing target. A control unit sets an ejection timing of the liquid from the nozzles for each nozzle group according to a distance between the nozzles and the landing target. A driving signal generation unit generates driving signals including the ejection pulses, where a timing of each ejection pulse is based on the distance and a speed of the liquid as the liquid crosses the distance. The control unit selects the driving signal for each nozzle group based on the distance and applies a corresponding ejection pulse to the liquid. A liquid ejecting method is also provided.11-10-2011
20110273499METHOD FOR DETECTING ADJUSTMENT VALUE OF FLUID EJECTION DEVICE, AND FLUID EJECTION DEVICE - An adjustment method is a method for adjusting a fluid ejection device having first and second heads with the first head disposed on an upstream side of the second head in a feed direction in which a medium is conveyed, the second head forming dot rows of a fluid between dot rows of the fluid formed by the first head. The first head and the second head are driven with a first voltage change amount to form a first test pattern, and the first head and the second head are driven with a second voltage change amount to form a second test pattern.11-10-2011
20110273498DRIVING DEVICE, RECORDING HEAD, AND APPARATUS USING THE SAME - According to an aspect of the present invention, a high-resolution, small-size, low-cost driving device includes a clock signal generating unit configured to receive a first clock signal of a differential signaling system and generate a second clock signal, an input unit configured to input a data signal which includes first information and second information, a first timing generating unit configured to select an edge of the second clock signal based on the first information and to generate a first signal by counting occurrences of the selected edge a second timing generating unit configured to select edge of the second clock signal based on the second information and to generate a second signal by counting occurrences of the selected edge, a logical circuit configured to generate a pulse signal based on the first and second signals, and a driving element configured to drive a driven element using the pulse signal.11-10-2011
20130147868INK JET RECORDING APPARATUS - The present invention relates to an ink jet recording apparatus including a recording head including a plurality of energy generation elements configured to generate thermal energy. The ink jet recording apparatus includes a specification unit and a control unit. The specification unit specifies a pulse width upper limit value of a prepulse during a recording operation based on a minimum pulse width by which ink is discharged by applying a drive pulse to the energy generation elements and a temperature of the recording head during the recording operation. The control unit controls the energy generation elements to be driven using a drive pulse of a prepulse with a pulse width equal to or less than the pulse width upper limit value.06-13-2013
20100302293INKJET PRINT HEAD WITH SHARED DATA LINES - An inkjet print head includes data signal lines configured to supply inkjet control voltages and non-volatile memory cell random access addresses. The inkjet print head includes an inkjet nozzle array wherein each nozzle in the array is configured to communicate with a data signal line. Also a non-volatile attribute memory cell array is included in the inkjet print head wherein each memory cell in the array is accessed through a data signal line shared with the nozzle array.12-02-2010
20120274689LIQUID EJECTING APPARATUS AND METHOD OF CONTROLLING LIQUID EJECTING APPARATUS - A liquid ejecting apparatus in which a more efficient micro-vibration of just the right degree is possible, by changing an applied frequency, or a micro-vibration voltage of a micro-vibration pulse with respect to a piezoelectric vibrator in a non-ejection period according to ejection data of one pass, or the length of the continuous non-ejection period which is determined from ejection data from a predetermined flushing processing to the subsequent flushing processing, and a continuous ejection period before and after the non-ejection period.11-01-2012
20120274688LIQUID EJECTING HEAD AND LIQUID EJECTING APPARATUS - A liquid ejecting head is provided in which a conductive plate is provided between a piezoelectric vibrator and a pressure chamber, and the conductive plate and the piezoelectric vibrator are electrically insulated from each other. By applying a voltage to the conductive plate, the ink ejected from the nozzles is positively charged, and mist generated by dividing the ink during flight is collected by a mist absorbing member of a mist collecting unit.11-01-2012
20110242172CAPACITIVE LOAD DRIVING CIRCUIT, INK JET PRINTER, AND FLUID EJECTING APPARATUS - A capacitive load driving circuit includes: a drive waveform signal generator that generates a drive waveform signal; a subtractor that outputs a differential signal between the drive waveform signal and a feedback signal; a modulator that pulse-modulates the differential signal and outputs a modulated signal; a digital power amplifier that amplifies the power of the modulated signal and outputs a power-amplified modulated signal; a smoothing filter that smoothes the power-amplified modulated signal, and outputs a drive signal of the capacitive load; a compensator that causes a phase to precede the drive signal; and an attenuator that attenuates signal amplitude in a band at least including a modulation frequency of the modulated signal. A signal output from a connecting point between the inductor and the wire is made to pass through the compensator and the attenuator and is then used as a feedback signal to the subtractor.10-06-2011
20110242171LIQUID EJECTING APPARATUS - An ejection pulse DP sequentially and continuously includes an expansion phase p10-06-2011
20110242170METHOD FOR OPERATING CONTINUOUS PRINTERS - A method for operating a continuous inkjet printer, the method includes forming drops with a drop formation period being the time between consecutive drop formations; creating a portion of the drops that strike the print media for forming print drops; creating a portion of the created drops that do not strike the print media for forming catch drops; creating the print drops to print on a series of consecutive pixel locations; wherein a time between the creation of consecutive print drops is inconsistent which causes an additional catch drop so that a gap is created; wherein when a gap is created, adjusting a velocity of the print drop adjacent to the gap to cause the print drop to shift slightly toward the gap.10-06-2011
20110242169CONTINUOUS PRINTER WITH ACTUATOR ACTIVATION WAVEFORM - A method for operating a drop generating device for selective formation of large-volume droplets and small-volume droplets, said method includes the steps of defining a small-drop waveform at least a pulse to form a small volume drop; defining a large-drop waveform that includes a set of pulses to form a large volume drop; creating a sequence of waveforms comprising waveforms of the small-drop and large-drop waveforms in response to image data the sequence of waveforms; and selectively inserting a perturbation pulse in the time interval between pulses of any two consecutive waveforms.10-06-2011
20110234669FLUID EJECTION DEVICE - A fluid ejection device includes a plurality of address lines and a fire line for communicating a fire signal. The device also includes a plurality of nozzle circuits coupled to the fire line and the plurality of address lines. Each nozzle circuit is configured, when enabled, to eject fluid via a different one of a plurality of nozzles in response to the fire signal. A subset of the plurality of address lines is coupled to each pair of the plurality of nozzle circuits. Each subset that is coupled to one of the pairs of nozzle circuits is selected so that simultaneous activation of every address line of that subset simultaneously enables each nozzle circuit in the pair or pairs of nozzle circuits coupled to that triad and none of the other nozzle circuits of the plurality of nozzle circuits.09-29-2011
20110234668Jetting Device with Reduced Crosstalk - A printing device for jetting a liquid includes a flow path body having a plurality of jetting flow paths, a liquid in the plurality of jetting flow paths, a piezoelectric actuator associated with each jetting flow path, a feed substrate having a plurality of fluid inlets, and a driver configured to apply a voltage pulse to the piezoelectric actuator. The first jetting flow path is adjacent to the second jetting flow path and a fluidic travel distance from the piezoelectric actuator of the first jetting flow path to a nozzle of the second jetting flow path is greater than a speed of sound in the liquid times the break off time of a droplet of the fluid from the nozzle.09-29-2011
20100315454RECORDING HEAD AND TEST APPARATUS FOR RECORDING HEAD - A recording head in which a plurality of recording elements is arranged in an order is provided. The recording head includes a plurality of driving circuits that generate signals for driving transistors, each of the plurality of driving circuits being provided for a corresponding one of the plurality of recording elements. The recording head further includes a plurality of temperature acquisition circuits that acquire temperatures of the recording elements and a signal generation circuit that generates signals for sequentially driving the recording elements. The temperature acquisition circuit corresponding to the first recording element performs acquisition of a temperature based on a signal that is generated by the driving circuit corresponding to the second recording element and a signal that is generated by the driving circuit corresponding to the third recording element.12-16-2010
20130155135FLUID EJECTION ASSEMBLY WITH CIRCULATION PUMO - A fluid ejection assembly includes a fluid slot, a recirculation channel, and a drop ejection element within the recirculation channel. A pump element is configured to pump fluid to and from the fluid slot through the recirculation channel. A first addressable drive circuit associated with the drop ejection element and a second addressable drive circuit associated with the pump element are capable of driving the drop ejection element and the pump element simultaneously.06-20-2013
20130155134LIQUID EJECTING APPARATUS AND LIQUID EJECTING METHOD - A liquid ejecting apparatus includes: a pressure chamber that communicates with a liquid supply section and a nozzle; an element that changes a pressure of liquid within the pressure chamber; and an ejection pulse generation section that generates an ejection pulse for operating the element to eject the liquid from the nozzle. The viscosity of the liquid is not less than 8 millipascal seconds. The nozzle has a first portion in which a liquid ejection side thereof has a smaller opening area than a pressure chamber side thereof, and a second portion which communicates with an ejection side end portion of the first portion. The ejection pulse has a depressurizing portion for depressurizing the liquid to attract a meniscus positioned on the second portion to the first portion, and a pressurizing portion for pressurizing the liquid to eject the liquid before the meniscus returns to the second portion.06-20-2013
20130182024INKJET HEAD AND AN INKJET RECORDING DEVICE - According to one embodiment, the inkjet head of an application example includes a pressure chamber for charging the ink, an actuator for changing the volume of the pressure chamber, a nozzle for discharging the ink inside the pressure chamber when the volume of the pressure chamber is changed, and a controller that, in the formation of one pixel by discharging ink drops from the nozzle, when the elapsed interval from discharging ink drops last time by the nozzle is less than the specified interval, outputs the discharging waveform corresponding to the ink drop number determined for the formation of the pixel, and when the elapsed interval is more than the specified interval, increases the number of ink drop discharge cycles above the number determined for the formation of the pixel.07-18-2013
20120281036LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a liquid ejecting head that includes a nozzle formation face on which a nozzle that ejects a liquid is formed and a pressure generator that is driven by the application of a driving signal for causing a pressure fluctuation in the liquid within a pressure chamber that is connected to the nozzle, and that ejects the liquid from the nozzle to a landing target by the driving of the pressure generator, a voltage application unit that is placed at a position that does not interfere with the liquid ejecting head, on the opposite side to the landing target with respect to the nozzle formation face, and at a position outside a region that opposes the nozzle formation face, and a voltage application section that applies a voltage to the voltage application unit.11-08-2012
20130182025IMAGE FORMING APPARATUS - According to an embodiment, provided is an image forming apparatus that includes: a print head that includes nozzles ejecting liquid droplets, and pressure generating units for ejecting liquid droplets; a drive waveform generating unit that generates and outputs a drive waveform given to the pressure generating units of the print head; a head drive unit that includes a switch unit connected to each pressure generating units, and a selection unit controlling the switch unit to be turned on and off in accordance with image data; a monitoring unit that monitors intermediate potential of the drive waveform; and a unit that outputs a signal for turning on all the switch units, if the monitoring unit detects that voltage is decreased to lower than a predetermined threshold in an interval between the drive waveform of one drive cycle and the drive waveform of a subsequent drive cycle.07-18-2013
20130182026INKJET RECORDING DEVICE AND IMAGE FORMING APPARATUS FOR STABLE INK EJECTION - An inkjet recording device includes a recording head, a head driving unit, and a controller. A selector of the head driving unit performs selection for individual nozzles so that when the drive waveform selection data for printing one line at this time sent from a data processing section indicates that the number of times of ink ejection is 0, and drive waveform selection data for printing the next one line indicates that the number of times of ink ejection is 0, drive voltage according to none of one or more drive waveforms for ink ejection or a drive waveform for meniscus oscillation is applied to a piezoelectric element.07-18-2013
20110310148Liquid Droplet Spraying Apparatus and Method - The present invention relates to a liquid droplet spraying apparatus and method. The liquid droplet spraying apparatus of the present invention includes a chamber containing a fluid; a nozzle body having a nozzle for spraying the fluid in the chamber to one side of a material to be printed; an electrostatic spray module which is arranged in the vicinity of the chamber or the nozzle, and which forms an electrostatic field for the fluid contained in the chamber to provide a first spray force for spraying the fluid via the nozzle to form a liquid droplet; a physical spray module which is arranged in the chamber and opposite the nozzle, and which provides a second spray force for assisting the first spray force when the first spray force is generated; and a control unit for controlling the electrostatic spray module and the physical spray module such that the first spray force and the second spray force can be provided in a specific pattern. The liquid droplet spraying method of the present invention includes the steps of forming an electrostatic field for the fluid contained in the chamber using the electrostatic spray module arranged in the vicinity of the chamber or the nozzle to provide a first spray force for spraying the fluid via the nozzle to form a liquid droplet, and providing a second spray force for assisting the first spray force using the physical spray module arranged in the chamber and opposite the nozzle, thus spraying the fluid and forming a liquid droplet.12-22-2011
20110310147LIQUID EJECTING DEVICE CAPABLE OF REDUCING VOLTAGE APPLICATION PERIOD AND PREVENTING LEAKAGE OF LIQUID - A driving-signal applying section maintains a first driving signal at a first low voltage prior to and subsequent to a first voltage application period during which voltage is applied to a first active potion based on image data for one recording medium, maintains a second driving signal at a second low voltage prior to and subsequent to a second voltage application period during which voltage is applied to a second active portion based on the image data, changes the second driving signal from the second low voltage to a second high voltage at a first time point that is a first predetermined period before a second time point that is a starting time point of the first voltage application period, and maintains the second driving signal at the second high voltage from the first time point until the second time point.12-22-2011
20130187965LIQUID EJECTING APPARATUS AND MANUFACTURING METHOD THEREOF - A liquid ejecting apparatus includes a correction section maintains a predetermined voltage range in which a displacement is greater than a predetermined ratio as a drive voltage range from a relationship between each voltage and the displacement when a reference waveform having a process that changes the voltage from a first voltage to a second voltage having a voltage difference and a process that changes the voltage from the second voltage to the first voltage is supplied by making the voltage difference between the first voltage and the second voltage constant and changing the first voltage and the second voltage, and wherein the correction section changes the drive waveform into a drive waveform having a minimum voltage and a maximum voltage defined within the drive voltage range.07-25-2013
20110316914BODY DIODE FORWARD CONDUCTION PREVENTION - A device has an output circuit arranged to receive a voltage pulse, a body diode associated with the output circuit, and a detection circuit electrically coupled to the voltage pulse and the output circuit, such that when the voltage pulse transitions from high to low, the detection circuit is configured to activate the output circuit to reduce current in the body diode. A circuit to control parasitic power dissipation in an integrated circuit has a P-channel FET having a source electrode coupled to a high voltage signal source and a drain electrode coupled to a load, a body diode associated with the P-channel FET such that the body diode conducts current on a falling edge of a high voltage pulse from the high voltage signal source, and a detection circuit electrically coupled to the P-channel FET arranged to cause the P-channel FET to turn on when the body diode conducts current so as to reduce the current and lower parasitic power dissipation caused by the body diode conducting current. An apparatus has a print head arranged to dispense ink onto a print surface through an array of ejection ports, a print driver circuit electrically coupled to the print head and configured to provide voltage pulses to actuate the ejection ports through an output circuit, and a detection circuit electrically coupled to the output circuit and arranged to receive a signal from the print driver circuit when a body diode associated with the output circuit becomes forward biased, and to send a signal to the output circuit to turn the output circuit on.12-29-2011
20120019578CROSSTALK REDUCTION IN PIEZO PRINTHEAD - Crosstalk in a piezo printhead is reduced by storing a coefficient that expresses an amount of crosstalk between a first nozzle and an adjacent nozzle. A drive waveform voltage is pre-biased using the coefficient, and the pre-biased waveform is applied to a piezoelectric material of the first nozzle.01-26-2012
20130194330CONTROL ELEMENT FOR PRINTED DROP DENSITY RECONFIGURATION - A continuous printing system includes a printhead and a controller. The printhead includes a nozzle and a jet control element including a continuous heater element positioned to surround the nozzle. A plurality of three or more electrical contacts is in electrical communication with the continuous heater element and define a plurality of three or more continuous heater element portions that are actuatable with sufficient independence so as to control jet steering. The number of the continuous heater element portions equals the number of electrical contacts. A controller is configured to apply a waveform to at least one of the plurality of three or more electrical contacts to affect at least one of the plurality of independently actuatable continuous heater element portions.08-01-2013
20130194331CONTROL ELEMENT FOR PRINTED DROP DENSITY RECONFIGURATION - A method of printing includes providing a printhead including a jet control element including a continuous heater element positioned to surround a nozzle. A plurality of three or more electrical contacts is in electrical communication with the continuous heater element. The plurality of three or more electrical contacts define a plurality of three or more continuous heater element portions that are actuatable with sufficient independence so as to control jet steering. The number of the continuous heater element portions equals the number of electrical contacts. A liquid is provided under a pressure sufficient to eject a jet of liquid through the nozzle. A waveform is applied to at least one of the plurality of three or more electrical contacts using a controller to affect at least one of the plurality of independently actuatable continuous heater element portions to control the jet of liquid.08-01-2013
20130194332APPARATUS AND METHOD FOR TREATMENT OF PRINTED INK IMAGES - An inkjet printer ejects ink drops onto a surface of a print medium to form an ink image. A fluid emitter sprays fluid onto the ink image. The fluid sprayed on the ink image reduces or eliminates an offset of ink from the ink image during additional processing of the print medium after the ink image is printed on the print medium.08-01-2013

Patent applications in class Drive waveform

Patent applications in all subclasses Drive waveform