Patent application number | Description | Published |
20080239007 | PRINT HEAD - The present invention provides a print head that allows the characteristics of ejected ink to be adjusted for each ejection port in spite of a variation in the distance from an ink supply port to the heating element. In the print head according to the present invention, the area of the heating element decreases with increasing distance from the ink supply port and increases with decreasing distance from the ink supply port. The heating element is shaped like a rectangle that is longer in a direction orthogonal to a direction in which the plurality of ejection ports are arranged than in the direction in which the plurality of ejection ports are arranged. The aspect ratio of the heating element depends on the length of an ink channel through which ink is introduced into the bubbling chamber. | 10-02-2008 |
20080239011 | INK JET RECORDING HEAD AND LIQUID JETTING METHOD - A liquid recording head includes thermal energy generating means, having a flat plate configuration, for generating a bubble by thermal energy; a pressure chamber in which said thermal energy generating means is provided; a flow path for introducing liquid into said pressure chamber; a supply port in fluid communication with said flow path; and an ejection outlet provided at a position opposing said thermal energy generating means in fluid communication with said pressure chamber, wherein said thermal energy generating means includes a first major surface facing said ejection outlet and a second major surface opposite said first major surface, and wherein a distance between said first major surface and ceiling surface of said pressure chamber in which said ejection outlet is formed is shorter than a distance between said second major surface and a bottom surface of said pressure chamber. | 10-02-2008 |
20090058933 | INK JET PRINT HEAD - An object of the present invention is to provide an ink jet print head having plural types of nozzles arranged on the same substrate and through which ink droplets of different sizes are ejected, the ink jet print head exhibiting acceptable ejection performance regardless of the type of the nozzle. Thus, according to the present invention, each of the plural types of nozzles includes a bubbling chamber having an ejection energy generating element allowing an ink droplet to be ejected to a position located opposite an ejection port and an ejection port portion allowing the ejection port and the bubbling chamber to communicate with each other. Ratio of opening area of the ejection port portion at a position where the ejection port portion and the bubbling chamber communicate with each other, to the opening area of the ejection port is higher for the nozzle with a smaller ejection amount. | 03-05-2009 |
20090058949 | LIQUID EJECTION HEAD, INKJET PRINTING APPARATUS AND LIQUID EJECTING METHOD - Provided are a printing head and an inkjet printing apparatus, which eject liquid droplets without leaving behind any bubble in each nozzle, thus having an enhanced durability. An ejection port of the printing head includes a first ejection port part communicating with the atmosphere and a second ejection port part having a cross-section orthogonal to an ejection direction being larger than a cross-section of the first ejection port part orthogonal to the ejection direction, and being formed between the energy effect chamber and the first ejection port part. In addition, the second ejection port part is formed to be eccentric to an electrothermal transducing element in an ink supply direction in which ink is supplied from an ink supplying port to the bubbling chamber. | 03-05-2009 |
20090066752 | LIQUID JET HEAD - A liquid ejecting head includes a plurality of nozzles each including an ejection outlet for ejecting a droplet, an ejection energy generating element, disposed at a position opposing the ejection outlet, for generating energy for ejecting a droplet, a pressure chamber provided with the ejection energy generating element and fluidly communicating with the ejection outlet, and a supply passage for supplying the liquid to the pressure chamber, wherein the nozzles include a first nozzle and a second nozzle which are connected with respective ones of the supply passages having lengths different from each other, wherein the first nozzle and the second nozzle are, disposed at one end portion with respect to a widthwise direction of an elongated supply chamber for supplying the liquid to the first nozzle, wherein the supply passage for the first nozzle extends in a direction perpendicular to a direction of liquid ejection from the ejection outlet and fluidly communicates with the supply chamber, and wherein the supply passage for the first nozzle extends in a direction parallel with the direction of liquid ejection. | 03-12-2009 |
20090147050 | LIQUID EJECTING HEAD AND MANUFACTURING DIMENSION CONTROL METHOD - A liquid ejecting head includes a substrate, a nozzle forming member for forming on a principal surface of the substrate a nozzle comprising a flow passage of liquid and an orifice for ejecting the liquid, and a dummy pattern. The dummy pattern has substantially the same dimension as at least a part of the nozzle and is formed so that a cross section of the dummy pattern is exposed at an end surface of the nozzle forming member. | 06-11-2009 |
20090147056 | INKJET PRINT HEAD - The landing precision of ink drops is improved to improve the image quality and increase the printing speed. An inkjet print head ejects ink supplied from an ink supply port from a plurality of ejection ports respectively connecting to ink paths having different flow resistances by using energy generated by a plurality of electrothermal transducer elements respectively corresponding to the plurality of the ejection ports, wherein each of the plurality of the ejection ports connected to the ink paths having a low ink flow resistance is arranged so that the center of each of the plurality of the ejection ports is positioned farther away from the ink supply port to the center of the corresponding electrothermal transducer element than each of the plurality of the ejection ports connected to the ink paths having a high ink flow resistance. | 06-11-2009 |
20090153624 | LIQUID EJECTION HEAD AND PRINTING APPARATUS - The present invention provides a reliable print head with improved reliability which is inhibited from being damaged by possible cavitation in ink inside a bubbling chamber, as well as a printing apparatus using the print head. A plurality of ink supply paths through which the ink is supplied to the bubbling chamber are connected to the bubbling chamber. Communication positions where the plurality of ink supply paths communicate with the energy acting chamber are formed such that distanced from a heater formation surface of the communication positions are different from each other along a direction orthogonal to the heater formation surface. | 06-18-2009 |
20090201343 | LIQUID EJECTION HEAD AND MANUFACTURING METHOD OF LIQUID EJECTION HEAD - The present invention provides a liquid ejection head for which the peeling of an orifice plate from a substrate seldom occurs, even in a structure such that the walls that define each energy application chamber are narrowed toward a ejection port. The walls that define a first pressure chamber are inclined inward within the first pressure chamber, so that the first pressure chamber is narrowed, toward an ejection port, along a direction perpendicular to the heater formation face on which heaters are arranged. Further, the walls that define each ink flow path are inclined in the ink ejection direction. Furthermore, the angle at which the walls that define the ink flow path are inclined relative to the ink ejection direction is smaller than the angle at which the walls that define the first pressure chamber are inclined inward, within the first pressure chamber. | 08-13-2009 |
20090251509 | PRINTHEAD SUBSTRATE, PRINTHEAD, HEAD CARTRIDGE, AND PRINTING APPARATUS - This invention is directed to a head substrate capable of high-quality printing even when the environmental temperature, print duty, and printhead itself change, a printhead, a head cartridge, and a printing apparatus using the printhead. The head substrate includes a plurality of heaters, a constant electric current source which generates a constant electric current used to drive the heaters, and a reference current generation circuit which generates a reference current for generating the constant electric current. The head substrate also includes a MOSFET which drives the heaters by the constant electric current obtained by driving the constant electric current source in accordance with the reference current, and a switch which determines the time for which the reference current is generated. The open-close time of the switch can be externally controlled. | 10-08-2009 |
20090315945 | PRINT HEAD - A present invention improves the impact accuracy of ejected droplets, the quality of printed images, and print speed. A print head according to the present invention has an ink channel for which the width thereof in a direction orthogonal to an ink supply direction in which ink is supplied from an ink supply port to a pressure chamber is smaller than that of a pressure chamber. In the print head, the center of a heater along the ink supply direction is offset from the center of the pressure chamber along the ink supply direction, toward the side of the pressure chamber far from the ink supply port in the ink supply direction. | 12-24-2009 |
20100045719 | INK JET PRINT HEAD, INK JET PRINTING APPARATUS AND INK JET PRINTING METHOD - While the print head is reduced in size, the adverse effect of air flows produced by ink droplets as they are ejected from a small number of ejection opening arrays is minimized. A small number of first ejection opening arrays eject one of three primary colors—cyan, magenta and yellow—, and a large number of second and third ejection opening arrays eject the remaining two primary colors. A fourth ejection opening array, disposed between the first ejection opening array and second or third ejection opening array. | 02-25-2010 |
20100053277 | LIQUID EJECTION HEAD - A present invention provides a print head improving an ink refill speed to reduce the time from the end of ejection of ink droplets until the beginning of next ejection of ink droplets and maintaining the high quality of images obtained by printing. An ink jet print head has an ejection port portion | 03-04-2010 |
20100091067 | LIQUID RECORDING HEAD - A liquid recording head includes an element substrate on which ejection energy generating elements for generating energy for ejecting droplets of liquid are provided in a staggered arrangement; ejection outlets provided opposed to the ejection energy generating elements; ejection energy generation chambers enclosing the ejection energy generating elements; and a flow path constituting member constituting first and second nozzles for supplying the liquid into the ejection energy generation chamber, wherein the second nozzles have flow path lengths shorter than those of the first nozzle, and the first and second nozzles are arranged alternately, wherein an average height of the path of the first nozzles is larger than that of the second nozzles. | 04-15-2010 |
20100188465 | INK JET PRINT HEAD - An object of the present invention is to provide an ink jet print head having plural types of nozzles arranged on the same substrate and through which ink droplets of different sizes are ejected, the ink jet print head exhibiting acceptable ejection performance regardless of the type of the nozzle. Thus, according to the present invention, each of the plural types of nozzles includes a bubbling chamber having an ejection energy generating element allowing an ink droplet to be ejected to a position located opposite an ejection port and an ejection port portion allowing the ejection port and the bubbling chamber to communicate with each other. Ratio of opening area of the ejection port portion at a position where the ejection port portion and the bubbling chamber communicate with each other, to the opening area of the ejection port is higher for the nozzle with a smaller ejection amount. | 07-29-2010 |
20100289843 | PRINTING APPARATUS AND CONTROL METHOD THEREFOR - A printing apparatus prints on a printing medium by scanning a printhead having a plurality of nozzle arrays in a first direction and a second direction opposite to the first direction, and has a structure in which an air flow entering the nozzle array in the scan of the printhead in the first direction becomes larger than an air flow entering the nozzle array in the scan of the printhead in the second direction. The apparatus increases, in scanning in the second direction, discharge speed of ink discharged from at least one nozzle array arranged leeward in the scanning direction of the printhead from a predetermined position on the printhead in the scanning direction to be higher than or equal to the discharge speed of ink discharged from at least one nozzle array arranged windward in the scanning direction of the printhead from the predetermined position. | 11-18-2010 |
20100328384 | INKJET PRINTING APPARATUS AND INKJET PRINTING METHOD - An inkjet printing apparatus and an inkjet printing method are provided which can minimize air current disturbances that occur between the print head and the print medium and also minimize density unevenness caused by mask patterns. For this purpose, the 2-pass printing is performed such that the high printing ratio region and the low printing ratio region are alternated every pixel in the nozzle-arrayed direction and that adjoining groups of high printing ratio regions are separated from one another by a group of low printing ratio regions that forms a passage wide enough for air currents to pass through. | 12-30-2010 |
20110074884 | INKJET HEAD - To provide an inkjet head which includes high-density nozzle rows and which does not easily cause an ejection failure due to adhesion of ink mist around ejection orifices when a high-density image of a secondary color is printed with a small number of paths. An inkjet head includes at least two or more types of nozzle rows that eject different amounts of ink. When A is the cross section, with respect to an ink supplying direction, of an ink supply path from each ejection orifice to a supply port and L is the length of the ink supply path, the value of A/L differs between the two or more types of nozzle rows. The nozzle row of which the value of A/L is small is disposed outside an area between the nozzle rows that eject a largest amount of ink and that are arranged next to each other. | 03-31-2011 |
20110084999 | INKJET PRINT APPARATUS AND INKJET PRINT METHOD - An objective is to provide an inkjet print apparatus and an inkjet print method capable of a print without concentration unevenness. To achieve the objective, in a multiple-pass print using mask patterns each having low-print-percentage areas and high-print-percentage areas, the print-percentage difference between high-print-percentage areas and low-print-percentage areas is cancelled out in left-edge and right-edge parts of an image to be printed. | 04-14-2011 |
20130076835 | LIQUID DISCHARGE HEAD - A liquid discharge head includes a plurality of discharge ports configured to discharge liquid, a supply port configured to retain the liquid to be discharged from the plurality of discharge ports, a first pressure chamber including a first energy generation element to discharge a predetermined amount of liquid droplets, a second pressure chamber including a second energy generation element to discharge an amount of liquid droplets greater than the predetermined amount, a first flow path through which the supply port and the first pressure chamber communicate with each other, and a second flow path through which the first pressure chamber and the second pressure chamber communicate with each other. | 03-28-2013 |
20130286096 | LIQUID DISCHARGE HEAD AND LIQUID DISCHARGE APPARATUS USING THE SAME - A liquid discharge head includes: a substrate including an element that generates energy to discharge liquid and a liquid supply port; a flow path forming member on the substrate which forms a space therebetween with the substrate and has a discharge port therein, the space constituting a pressure chamber, and a flow path causing the pressure chamber and the liquid supply port to communicate; an interlayer provided between the substrate and the flow path forming member; and a protection layer including metal for protection, wherein the interlayer is disposed so as to avoid a first region corresponding to the element, a second region corresponding to a region of the flow path on a pressure chamber side, and a portion corresponding to a boundary between the first region and the second region, and wherein at least apart of the portion is covered with the protection layer. | 10-31-2013 |
20130307889 | INKJET PRINTING APPARATUS AND CONTROL METHOD THEREOF - There is provided an inkjet printing apparatus which can perform stable ejection also in successive printing at high speed even in a case of performing printing in use of a print head provided with an ejection opening surface having hydrophilic properties. The inkjet printing apparatus comprises an inkjet print head wherein the control unit controls the print head such that, in a case where the ejection number of the ink ejected from the print head after removing the ink on the ejection opening surface by the ink removal unit is equal to or more than a threshold, a drive energy amount that is supplied for the preliminary ejection operation is larger than a drive energy amount that is supplied for the preliminary ejection operation in a case where the ejection number is less than the threshold. | 11-21-2013 |
20140125737 | PRINT HEAD AND INKJET PRINTING APPARATUS - The print head includes an energy generating element, a chamber for accommodating liquid, and an ejection opening arranged in a position corresponding to the energy generating element. The ejection opening includes at least one projection projecting inside of the ejection opening, the ejection opening having a first region between a front end of the projection and an inner wall of the ejection opening positioned at the shortest distance from the front end, and second regions positioned in both sides of the projection and different from the first region, and when a width of the projection at a chamber-side opening face is represented as a | 05-08-2014 |
20140152725 | PRINTING APPARATUS AND AGING METHOD - An embodiment of this invention is directed to preventing a decrease in the number of media printable with ink in an ink tank owing to an increase in waste ink in aging processing, and an increase in aging processing time. According to the embodiment, aging processing is executed as follows in a printing apparatus in which a printhead including a plurality of nozzles and a nozzle array formed from these nozzles and discharge ink is reciprocally scanned in a direction different from the direction of the nozzle array, and an image is printed by forward printing and backward printing. The aging processing is performed by changing the count at which the aging processing is performed, between nozzles at the edge side portion of the nozzle array and nozzles at the center side portion of the nozzle array. | 06-05-2014 |
20140198157 | PROCESS FOR PRODUCING CHIP - A process for producing a chip in which plural ejection orifice arrays are arranged including conducting reduction projection exposure plural times to a wafer having a substrate and a photosensitive resin layer formed thereon while relatively moving positions of the wafer and a reticle to form ejection orifice array patterns in the resin layer, developing the patterns to form ejection orifice arrays in the resin layer, and dividing the wafer to form plural chips in which the plural ejection orifice arrays are arranged. The exposure is conducted once to form in the resin layer a first ejection orifice array pattern corresponding to partial ejection orifice arrays in an arranging direction thereof in one chip, a second ejection orifice array pattern corresponding to all ejection orifice arrays in one chip and a third ejection orifice array pattern corresponding to partial ejection orifice arrays in an arranging direction thereof in one chip. | 07-17-2014 |
20140199633 | PROCESS FOR PRODUCING LIQUID EJECTION HEAD - A process for producing a liquid ejection head by providing, in one chip, a liquid ejection head having a portion for ejection in which an ejection orifice array is arranged and a side portion having no ejection orifice array, these portions being provided with a member of a photosensitive material, arranging the chip on a common substrate in such a chip array that these two portions are alternately arranged, and separating each chip from the substrate, the process including the steps of relatively moving a reticle of an aligner along the chip array for a photosensitive material on the substrate to expose each chip, and developing the material to obtain the member. A first reticle for forming the portion for ejection and a second reticle for forming only the side portion are used. The exposure includes a first and a second exposure treatment respectively by the first and second reticles. | 07-17-2014 |
20140307028 | LIQUID DISCHARGE HEAD AND METHOD OF MAKING THE SAME - A liquid discharge head includes a substrate including an energy generating element that generates energy used to discharge liquid and a discharge port member having a discharge port surface with a discharge port line including discharge ports, through which the liquid is discharged, arrayed in a first direction. The discharge port surface includes a groove portion disposed between the discharge port line and a first end of the discharge port member in a second direction intersecting the first direction. The groove portion extends along the discharge port line. The discharge port surface further includes an inclined surface disposed between an end of the discharge port line and a second end of the discharge port member in the first direction. The inclined surface is inclined toward the second end. | 10-16-2014 |