Patent application number | Description | Published |
20110285771 | LIQUID EJECTION DEVICE AND LIQUID TESTING METHOD - A liquid ejection device includes a plurality of nozzles and a common ejection testing portion. The nozzles are arranged to eject a liquid. The common ejection testing portion is provided in common to the nozzles, the common ejection testing portion being arranged to perform ejection testing of each of the nozzles during printing. At least one of the nozzles is selected to be tested using the common ejection testing portion when the liquid is ejected from the nozzles based on print data. The nozzles that eject liquid being identified based on the print data, and one of the nozzles, which have not been tested, having low ejection frequency based on the print data being selected as the at least one of the nozzles to be tested. | 11-24-2011 |
20110285772 | LIQUID 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 |
20110285773 | LIQUID 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 |
20110285775 | LIQUID EJECTION DEVICE AND LIQUID TESTING METHOD - A liquid ejection device includes a plurality of nozzles, an ejection testing portion and a controller. The nozzles are arranged to eject a liquid. The ejection testing portion is arranged to perform ejection testing of the liquid from each of the nozzles. The controller is arranged to eject the liquid from the nozzles to print an image onto a medium, and to perform a flushing operation when printing on the medium is not being performed. The ejection testing portion is arranged to perform the ejection testing of each of the nozzles during the flushing operation. The controller is arranged to terminate the flushing operation in midcourse when results of the ejection testing for the nozzles are normal. | 11-24-2011 |
20120206518 | LIQUID 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 |
20120223983 | LIQUID EJECTION DEVICE, INSPECTION METHOD, AND PROGRAM - A liquid ejection device comprising a plurality of ejection parts for ejecting liquid in cavities, an inspection part for inspecting the ejection parts. The ejection parts are classified into a plurality of ranks according to the characteristics of individual ejection parts. The inspection part performs inspection in accordance with a determination reference corresponding to the ranks. The inspection is performed consecutively on those among the plurality of ejection parts that are classified in the same rank. | 09-06-2012 |
20120262511 | LIQUID 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 |
20120320120 | LIQUID DISCHARGE DEVICE, TESTING METHOD, AND MEDIUM WITH RECORDED PROGRAM - There is provided a technique with which an abnormal discharge state in a discharge component can be determined on the basis of residual vibration. A printer includes a discharge component that discharges ink, a detector that detects residual vibration in the discharge component, and a tester that tests the discharge component on the basis of the change in the period of the residual vibration. | 12-20-2012 |
20130141484 | LIQUID EJECTION INSPECTION DEVICE AND LIQUID EJECTION INSPECTION METHOD - A liquid ejection device includes a head, a first sensor, a second sensor, a recovery unit, and a controller. The head is configured to eject liquid on a medium. The first sensor is configured to detect liquid ejection of the head by using a first principle. The second sensor is configured to detect the liquid ejection by using a second principle being different from the first principle. The recovery unit is configured to recover the liquid ejection of the head. The controller is configured to control the first sensor and the second sensor, and control the recovery unit based on a first detection result by the first sensor and a second detection result by the second detector. | 06-06-2013 |
20130293610 | LIQUID EJECTING APPARATUS, INSPECTION METHOD, AND PROGRAM - A liquid ejecting apparatus includes a head having a first ejecting unit including a first liquid ejecting nozzle, a first pressure chamber communicating with the nozzle, and a first drive element, and a second ejecting unit including a second liquid ejecting nozzle, a second pressure chamber communicating with the nozzle, and a second drive element. The first nozzle ejects liquid by applying a drive signal to the first drive element, and the second nozzle ejects liquid by applying the drive signal to the second drive element. The first nozzle state is determined using a first detection signal obtained by applying a first drive signal to the first drive element and a second drive signal to the second drive element, and a second detection signal obtained by applying the first drive signal to the first drive element and a third drive signal to the second drive element. | 11-07-2013 |
20130307896 | LIQUID EMISSION APPARATUS AND METHOD FOR LIQUID EMISSION - A liquid emission apparatus having a head provided with a plurality of nozzles which each emits liquid, the liquid emission apparatus being configured to emit liquid from the nozzles by applying a driving signal to the driver elements, the liquid emission apparatus being configured to apply the driving signal to the driver elements so as to obtain a plurality of detected signals, to decide whether one of the nozzles corresponding to one of the driver elements is causing a malfunction in liquid emission on the basis of one of detected signals, to drive the driver element corresponding to the nozzle again upon the nozzle having caused a malfunction in liquid emission, and to omit to drive the driver element corresponding to the nozzle upon the nozzle having caused no malfunction in liquid emission. | 11-21-2013 |
20140327712 | LIQUID DISCHARGE DEVICE, TESTING METHOD, AND MEDIUM WITH RECORDED PROGRAM - There is provided a technique with which an abnormal discharge state in a discharge component can be determined on the basis of residual vibration. A printer includes a discharge component that discharges ink, a detector that detects residual vibration in the discharge component, and a tester that tests the discharge component on the basis of the change in the period of the residual vibration. | 11-06-2014 |
20150054876 | LIQUID DISCHARGING APPARATUS - An ink jet printer is provided with a piezoelectric element which is provided corresponding to a pressure chamber in order to discharge liquid droplets, a driving signal generating section which generates a driving signal, a residual vibration detecting section which detects changes in an electromotive force of the piezoelectric element in accordance with the residual vibration inside the pressure chamber which occur after the driving signal is applied, a first switch which switches whether or not a driving signal is applied to the piezoelectric element, and a second switch which switches whether or not a change in the electromotive force is supplied to a first high-pass filter, where the second switch and the residual vibration detecting section are connected via a first capacitor of the first high-pass filter. | 02-26-2015 |
20150070420 | PRINTING APPARATUS AND METHOD OF CONTROLLING PRINTING APPARATUS - A printing apparatus includes an ejection unit including a piezoelectric element that is displaced according to a driving signal, and a nozzle capable of ejecting the liquid; a driving signal supply unit that supplies the driving signal; a detection unit that detects change of an electromotive force of the piezoelectric element; a determination unit that determines an ejection state of the liquid in the ejection unit based on the detection result of the detection unit; and a decision unit that is capable of performing a first process of deciding a waveform of the driving signal for inspection such that the liquid is not ejected from the nozzle when the driving signal for inspection is supplied to the piezoelectric element and a second process of correcting the waveform decided in the first process and deciding the corrected waveform as a waveform of the driving signal for inspection. | 03-12-2015 |