Entries |
Document | Title | Date |
20080198192 | Ink ejection method and inkjet ejection device - An ink ejecting device includes a plurality of nozzles, a plurality of pressure chambers respectively corresponding to the plurality of nozzles, an actuator capable of changing capacity of each of the plurality of pressure chambers. A first drive pulse signal is selected in accordance with dot information indicating dots to be formed on a recording medium successively. When the dot information for the current ejection cycle and the dot information for the succeeding ejection cycle indicate a first condition where ejection of a large amount of ink drop and no ejection of an ink drop, respectively, driving pulse signals for the current ejection cycle and the succeeding ejection cycle are selected, respectively. The driving pulse signals for the current ejection cycle and the succeeding ejection cycle are then output in the current ejection cycle and within the succeeding ejection cycle, respectively. | 08-21-2008 |
20080204493 | Fluid ejection device - A fluid ejection device having firing cells, signal lines configured to receive a series of pulses, and an address generator configured to receive pulses from the series of pulses and generate a set of address signals in response to the received pulses, wherein the set of address signals is adapted to enable the firing cells for activation. | 08-28-2008 |
20080238966 | Inkjet Recording Device And Controller, Control Program, And Control Method For Inkjet Recording Device - [PROBLEMS] To provide a controller, control program, and control method for an inkjet recording device, and an inkjet recording device capable of forming a high-quality image by making positional shift of a landing ink droplet inconspicuous through simple control. | 10-02-2008 |
20080238967 | PRINT HEAD PULSING TECHNIQUES FOR MULTICOLOR PRINTERS - In one aspect of the invention there is disclosed a multicolor thermal imaging system wherein different heating elements on a thermal print head can print on different color-forming layers of a multicolor thermal imaging member in a single pass. The line-printing time is divided into segments, each of which is divided into a plurality of subintervals. All of the pulses within the segments have the same energy. In one embodiment, every pulse has the same amplitude and duration. Different colors are selected for printing during the different segments by varying the fraction of subintervals that contain pulses. This technique allows multiple colors to be printed using a thermal print head with a single strobe signal line. Pulsing patterns may be chosen to reduce the coincidence of pulses provided to multiple print head elements, thereby reducing the peak power requirements of the print head. | 10-02-2008 |
20080252672 | INKJET HEAD DRIVING APPARATUS AND DRIVING METHOD - An inkjet head driving apparatus which drives an inkjet head for use in gradation printing which is performed to cause a capacity of each of a plurality of pressure chambers filled with ink to be changed by a drive pulse applied to an actuator, an ink drop to be emitted onto a recording medium from a nozzle communicating with the corresponding pressure chamber, and the number of ink drops emitted to be controlled according to the number of drive pulses, the driving apparatus including a drive signal generating section which applies a deboost pulse to decrease pressure in the pressure chamber before the drive pulse for emitting a first drop of ink is applied, wherein the deboost pulse includes a pulse applied to expand or contract the capacity of the pressure chamber for a predetermined length of time, and a quiescent time following the pulse. | 10-16-2008 |
20080316241 | NOZZLE ASSEMBLY FOR 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 is also included. 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 latches data in one of the registers of the shift register. A control gate outputs a control pulse in response to data in the transfer register. A drive transistor provides an energy pulse to the resistive element of the actuator upon receipt of the control pulse. | 12-25-2008 |
20080316242 | 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 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. Each energy pulse has a pulse voltage of less than 10 Volt. | 12-25-2008 |
20090002415 | RECORDING 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. | 01-01-2009 |
20090002416 | Fluid Ejection Device - A fluid ejection device comprising firing cells including a first group of firing cells and a second group of firing cells and control circuitry. The control circuitry is configured to respond to the control signal to selectively initiate a first sequence adapted to enable the first group of firing cells for activation and a second sequence adapted to enable the second group of firing cells for activation. | 01-01-2009 |
20090021545 | IMAGE FORMING APPARATUS AND METHOD OF GENERATING OUTPUT SIGNAL THEREOF - An image forming apparatus includes a clock generation unit to generate a plurality of unit pulse signals having frequencies which are multiples of a reference clock signal when print data having a higher resolution than a reference resolution is inputted to the image forming apparatus; and an output signal generation unit to divide the print data into plural units by applying the plurality of unit pulse signals to the print data, to detect successive pixels neighboring each other at a boundary between two of the respective units of print data, and to generate an output signal so that the successive pixels detected at the boundary form one dot. | 01-22-2009 |
20090027432 | Image Processing Apparatus, Image Processing Method and Computer-Readable Recording Medium of Image Processing Method - An image forming apparatus includes an image process control unit processing an image data and generating a control signal, and a drive pattern generation unit to generate a drive pattern to drive a recording head, based on the control signal, the drive pattern generation unit generating at least a first drive pattern and a second drive pattern which is different from the first drive pattern. The drive pattern generation unit sets a reference potential of the second drive pattern as a target reference potential and applying a pattern end of the first drive pattern to one of a pull-up pattern and a pull-down pattern operation before the second drive pattern is performed, wherein the drive pattern generation unit generates one of the pull-up pattern and the pull-down pattern based on a slope value obtained by comparing the target reference potential and the end potential. | 01-29-2009 |
20090040253 | LIQUID MATERIAL DISCHARGE CONTROL METHOD AND DROPLET DISCHARGE DEVICE - In a liquid material discharge control method, timing signals generated periodically are used to control discharge timing for discharging a liquid material from a plurality of nozzles onto a workpiece during a scan in which the nozzles and the workpiece are moved relative to each other. The liquid material discharge control method includes calculating a first elapsed time in a relative movement between the nozzles and the workpiece by counting a first prescribed number of outputs of the timing signals that define the discharge timing, comparing the first elapsed time with a first predicted time at which the nozzles are predicted to reach intended discharge positions on the workpiece, and discharging the liquid material from the nozzles onto the workpiece upon the first predicted time having elapsed when the first elapsed time is at least shorter than the first predicted time. | 02-12-2009 |
20090046117 | Systems and Methods for Controlling Ink Jet Pens - A control circuit is provided for controlling ink jet pens having different numbers of internal select lines using external select lines that extend between the control circuit and the ink jet pens and that are shared by the ink jet pens. In one embodiment, the control circuit includes a register that store values, the values indicating whether a pulse is or is not to be sent as to each of the external select lines, a first control module configured to control select pulses sent on a first external select line after consultation of the register, and a second control module configured to control select pulses sent on a second external select line after consultation of the register. | 02-19-2009 |
20090058904 | PRINTHEAD AND PRINTING APPARATUS USING THE PRINTHEAD - The first and second selection signals for selecting one of print data and n pulse signals stored in a shift register are latched. The first or second selection signal is selected in accordance with an input selection information switching signal, and one of the n input pulse signals is selected based on the selected signal. A heat pulse selection circuit outputs the selected pulse signal as a heat pulse signal. The level of the selection information switching signal switches midway to switch the selected pulse signal. Parts of two pulse signals before and after switching are combined to generate a heat pulse signal. | 03-05-2009 |
20090066741 | LIQUID DISCHARGING APPARATUS AND METHOD OF CONTROLLING THE SAME - A liquid discharging apparatus includes a discharging device, a liquid receiving device, a voltage applying device, an electrical change detection device, a driving signal generating device, and a control device. The discharging device discharges liquid from a nozzle to a target on the basis of discharge data. At the time of discharging, the control device controls the discharging device so as to perform discharging on the basis of the discharge data using a generated discharge data driving signal. At the time of the nozzle testing, the control device controls the voltage applying device so as to apply a predetermined voltage between the discharging device and the liquid receiving device and controls the discharging device using a test driving signal to determine on the basis of an electrical change detected by the electrical change detection device whether the liquid is discharged to thereby perform the nozzle testing. | 03-12-2009 |
20090066742 | PRINTHEAD WITH INCREASING DRIVE PULSE TO COUNTER HEATER OXIDE GROWTH - An inkjet printer that has a printhead with an array of ejection devices for ejecting drops of liquid onto a media substrate. Each of the ejection devices having a chamber for holding liquid, a nozzle in fluid communication with the chamber and a heater positioned in the chamber for contact with the liquid such that resistive heating of the heater generates a vapour bubble that ejects a drop of the liquid through the nozzle. The printer also has a controller for receiving print data and generating drive pulses to energize the heaters in accordance with the print data. The controller increases the drive pulse energy during the printhead lifetime. | 03-12-2009 |
20090073207 | LIQUID DROPLET EJECTING APPARATUS AND LIQUID DROPLET EJECTING METHOD - A liquid droplet ejecting apparatus having: a liquid droplet ejecting head; and a drive pulse generating unit, wherein the head includes: a nozzle; a pressure chamber which communicates with the nozzle; and a pressure applying section which changes a pressure in the pressure chamber, wherein the generated drive pulse is applied to the pressure applying section so as to change the pressure in the pressure chamber to cause the liquid in the pressure chamber to be ejected from the nozzle, and wherein the drive pulse comprises a rectangular expansion pulse which causes expansion and then contraction of the volume of the pressure chamber and in which the pulse width PW of the expanding pulse is set so as to satisfy the following conditional equation, | 03-19-2009 |
20090073208 | LIQUID DISCHARGING APPARATUS, METHOD OF CONTROLLING THE SAME, AND PROGRAM THAT IMPLEMENTS THE METHOD - A liquid discharging apparatus includes a discharging device, a liquid receiving device, a voltage applying device, and a control device. The discharging discharges liquid from a nozzle to a target on the basis of discharge data, where it is received by a liquid receiving device. The voltage applying device applies a predetermined voltage between the discharging device and the liquid receiving device. When discharging on the basis of the discharge data, the control device controls the discharging device to discharge using a generated discharge data driving signal. When performing nozzle testing, the control device controls the voltage applying device to apply the predetermined voltage between the discharging device and the liquid receiving device and controls the discharging device using a generated test driving signal to discharge liquid from the nozzle to determine on the basis of a detected electrical change whether liquid is discharged from the nozzle. | 03-19-2009 |
20090079773 | FLUID EJECTING APPARATUS - A fluid ejecting apparatus including a pressure chamber filled with fluid, a pressure generating element that is provided on a surface of the pressure chamber that changes the volume of the pressure chamber, a nozzle that is in fluid communication with the pressure chamber that ejects the fluid, and a control unit that generates a maintenance drive pulse for discharging unnecessary bubbles together with fluid from the pressure chamber, wherein the maintenance drive pulse includes a first pulse portion that causes the pressure chamber to expand into an expanded state, a second pulse portion that maintains the expanded state for a predetermined period of time, and a third pulse portion that causes the pressure chamber to contract, wherein the pulse width of the first pulse portion is set to be equal to or smaller than half the Helmholtz resonance period of the fluid in the pressure chamber. | 03-26-2009 |
20090085946 | INKJET RECORDING HEAD AND INKJET RECORDING APPARATUS HAVING THE SAME - An inkjet recording head includes a passage communicating with a discharge port for discharging ink, a discharging heater provided in the passage for generating energy to discharge ink from the discharge port, and a detecting unit provided in the passage for detecting a temperature of ink that changes in accordance with heat energy generated by the detecting unit and a flow of ink in the passage. | 04-02-2009 |
20090096824 | METHODS AND APPARATUS FOR CONTROL OF A SIGNAL IN A PRINTING APPARATUS - A printing apparatus is provided that precisely control the transition of an electrical signal that causes a printing substance to be deposited. In particular, in some embodiments, a circuit is configured to control the application of a firing pulse to a printing element, and the printing element is configured to control the application of a printing substance. The circuit in this embodiment is co figured to condition or control the transition of the firing pulse from the first state to the second state such that current through the printing element dissipates to zero over a period of tine that is neither too fast nor too slow. | 04-16-2009 |
20090128592 | INK JET PRINTING APPARATUS AND INK EJECTION CONTROL METHOD - In an ink jet printing apparatus, preliminary ejection for a print head involving a plurality of distances from a common ink supply port to respective ejection openings is optimized. Specifically, for a first nozzle array and a second nozzle array with different distances from the ink supply port to the ejection opening, the ratio of a driving pulse width to a lower limit pulse width for the second nozzle array with the longer distance is set to be higher than the ratio for the first nozzle array with the shorter distance. This enables a reduction in the time required for preliminary ejection of the apparatus as a whole. | 05-21-2009 |
20090141058 | INKJET RECORDING APPARATUS - An inkjet recording apparatus has a head which includes, a plurality of nozzles each of which jets ink containing spacer beads dispersed therein on a substrate; a plurality of pressure chambers each of which communicates with each of the nozzles; and an plurality of electromechanical transducers which change a capacity of each of the pressure chambers by applying a voltage pulse, wherein the ink is jetted from each of the nozzles by applying to each of the electromechanical transducers the voltage pulse which includes a first pulse for increasing the capacity of the pressure chamber and then decreasing the capacity after a lapse of a predetermined time, wherein, when a half of an acoustic resonance period of a pressure wave in the pressure chambers is assumed as AL, a width of the first pulse is twice of the AL or more. | 06-04-2009 |
20090141059 | PRINTHEAD, PRINTING APPARATUS, AND PRINTHEAD DRIVING METHOD - A printhead includes a driving unit configured to drive a plurality of heaters, a register configured to input data of a plurality of bits corresponding to the number of heaters, a latch configured holding the data transferred from the register; a generation unit configured to generate a control signal of the driving unit for each heater based on a value of the data and a change in a level of an enable signal including a plurality of pulse signals; and an output unit outputting the control signal generated by the generation unit to the driving unit in synchronism with the pulse signals. | 06-04-2009 |
20090147036 | LIQUID 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. | 06-11-2009 |
20090160893 | METHODS AND APPARATUS FOR OPTIMIZING ENERGY SUPPLIED TO A PRINT HEAD HEATER - Methods and apparatuses for optimizing the energy supplied to a print head heater are disclosed. A resistance associated with the print head heater or actuator is determined. A range of fire pulse values is determined based at least in part on the determined resistance and a velocity optimization procedure is executed based at least in part on the determined range of fire pulse values. An optimal fire pulse for the print head heater is selected based at least in part on the results of the velocity optimization procedure. | 06-25-2009 |
20090174738 | LIQUID JET APPARATUS AND DRIVING METHOD FOR LIQUID 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 adjustment circuit adapted to adjust a modulation period of the pulse modulation of the modulator in accordance with a reset signal forming a basis of timing for driving the actuator. | 07-09-2009 |
20090207201 | METHOD 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. | 08-20-2009 |
20090219316 | PRINTING METHOD AND APPARATUS - A printing method and apparatus is disclosed wherein the printhead has a linear array of nozzles oriented in an axis, and drops of a liquid are printed at a particular location from first and second nozzles of the printhead at a first location. In an embodiment, the nozzles are arranged in groups, each group of nozzles being used to superpose spots of a particular liquid at a different location. A further method is described wherein the printhead is triggered by transferring printing triggers from a processing module to a printhead at print intervals representative of a plurality of fixed units of spatial displacement of the printhead. The present invention is particularly advantageous for the cycling of print nozzles, superposition of spots in linear arrays and fine control of spot positioning. The invention has particular application in the field of printing DNA microarrays. | 09-03-2009 |
20090231372 | LIQUID EJECTING APPARATUS AND METHOD OF SETTING SIGNAL FOR MICRO VIBRATION - A liquid ejecting apparatus includes liquid chambers in which a liquid is filled, nozzles communicating with the liquid chambers, a signal generator generating a signal of potential change, and elements operating in accordance with the potential of the signal to be applied to cause a change in pressure in the liquid chambers. The signal generator generates a signal for micro vibration of a free surface of the liquid to be exposed from the nozzles such that the liquid is not ejected. The signal for micro vibration has a first potential change portion at which a potential changes from a first potential to a medium potential between the first potential and a second potential, a subsequent constant potential portion at which the potential is maintained constant at the medium potential, and a subsequent second potential change portion at which the potential changes from the medium potential to the second potential. | 09-17-2009 |
20090231373 | CHARGE LEAKAGE PREVENTION FOR INKJET PRINTING - Charge leakage prevention and voltage drift prevention on a droplet ejection device for an inkjet printer. In one method to prevent charge leakage on a droplet ejection device with a switch and a piezoelectric actuator, the method includes controlling the switch to drive the piezoelectric actuator with the waveform input signal during a droplet firing period, and controlling the switch to drive the piezoelectric actuator with a constant voltage level during a non-firing period. | 09-17-2009 |
20090262156 | LIQUID DROPLET EJECTING HEAD AND IMAGE FORMING APPARATUS - A liquid droplet ejecting head includes: an ejector having a nozzle, a pressure chamber, and a drive element that applies pressure to a liquid inside the pressure chamber; and a controller that applies a drive waveform to the drive element. The controller vibrates a flow velocity of the liquid ejected from the nozzle in a first positive direction vibration mode for causing a leading end portion of the liquid droplet to be ejected from the nozzle toward the opposite side of the pressure chamber side; and a second positive direction vibration mode for adjusting the velocity of a trailing end portion of the liquid droplet. An interval between the first positive direction vibration mode and the second positive direction vibration mode is set so as to make the velocity of the trailing end portion of the columnar liquid droplet faster than the velocity of the leading end portion thereof. | 10-22-2009 |
20090267980 | IMAGE 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. | 10-29-2009 |
20090289981 | METHOD AND APPARATUS TO PROVIDE VARIABLE DROP SIZE EJECTION WITH A LOW POWER WAVEFORM - In one embodiment, a method for driving a droplet ejection device having an actuator includes applying a low power multi-pulse waveform having at least two drive pulses and at least one intermediate portion to the actuator. The method further includes alternately expanding and contracting a pumping chamber coupled to the actuator in response to the at least two drive pulses and the at least one intermediate portion. The method further includes causing the droplet ejection device to eject one or more droplets of a fluid in response to the pulses of the low power multi-pulse waveform. In some embodiments, at least one intermediate portion has a voltage level greater than zero and less than or equal to a threshold voltage level in order to reduce the power needed to operate the droplet ejection device. | 11-26-2009 |
20090289982 | PROCESS AND APPARATUS TO PROVIDE VARIABLE DROP SIZE EJECTION WITH AN EMBEDDED WAVEFORM - Described herein is a process and apparatus for driving a droplet ejection device with embedded multi-pulse waveforms. In one embodiment, the process includes generating a multi-pulse waveform that includes drive pulses in predetermined positions. Next, the process includes applying the drive pulses to the actuator and causing the droplet ejection device to eject a first droplet of a fluid. The process also includes applying a second multi-pulse waveform having at least one embedded pulse to the actuator and causing the droplet ejection device to eject a second droplet of the fluid. Each embedded pulse is embedded between predetermined positions of two drive pulses. In some embodiments, the first and second droplets have different droplet sizes and these droplets are ejected at substantially the same effective drop velocity. | 11-26-2009 |
20090289983 | METHOD AND APPARATUS TO PROVIDE VARIABLE DROP SIZE EJECTION BY DAMPENING PRESSURE INSIDE A PUMPING CHAMBER - Described herein is a method and apparatus for driving a droplet ejection device with multi-pulse waveforms. In one embodiment, a method for driving a droplet ejection device having an actuator includes applying a multi-pulse waveform having two or more drive pulses and a cancellation pulse to the actuator. The method further includes generating a pressure response wave in a pumping chamber in response to each pulse. The method further includes causing the droplet ejection device to eject a droplet of a fluid in response to the drive pulses of the multi-pulse waveform. The method further includes canceling the pressure response waves associated with the drive pulses with the pressure response wave associated with the cancellation pulse. | 11-26-2009 |
20090322812 | INKJET PRINTER UTILIZING SENSED FEEDBACK TO CONTROL TIMING OF FIRING PULSES - An inkjet printer comprises a printhead having a plurality of inkjet nozzles, a controller connected to the printhead for controlling a timing of firing pulses, and feedback lines for communicating sensed printhead feedback to the controller. The controller is configured to adjust the timing of the firing pulses in response to the feedback communicated to the controller from the printhead. | 12-31-2009 |
20090322813 | INKJET PRINTHEAD WITH VARIABLE DRIVE PULSE - An inkjet printhead with an array of nozzles | 12-31-2009 |
20100045718 | DRIVE POWER CONTROL DEVICE, LIQUID EJECTION APPARATUS, AND DRIVE POWER CONTROL METHOD - A drive power control device according to the present invention includes a transistor, which is input with a driving signal before current amplification into a base thereof, and which amplifies a current of the driving signal to drive an actuator; a switching element, which switches an input of a supply voltage to a collector of the transistor between on and off; and a voltage comparator, which compares a base voltage and a collector voltage of the transistor, and which controls the switching element such that the input of the supply voltage to the collector is turned off when a predetermined voltage difference occurs, and the input of the supply voltage to the collector is turned on when a predetermined voltage difference does not occur. | 02-25-2010 |
20100079521 | LIQUID 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 level-data setting unit for setting a selected level data from a plurality of level data, based on an ejecting data; a driving-signal generator for generating a first driving signal and a second driving signal; and a driving-pulse generator for generating a driving pulse based on the selected level data and the first driving signal and the second driving signal. The first driving signal and the second driving signal are periodical signals having a same period. The first driving signal includes a first large-drop pulse-wave and a third large-drop pulse-wave. The second driving signal includes a second large-drop pulse-wave. The first large-drop pulse-wave, the second large-drop pulse-wave and the third large-drop pulse-wave have a same waveform, and appear in that order at regular intervals. | 04-01-2010 |
20100091061 | LIQUID DISCHARGING DEVICE AND METHOD OF CONTROLLING THE SAME - A liquid discharging device includes a liquid discharging head which discharges liquid. A drive signal generator generates a drive pulse. A liquid receiving portion faces a nozzle-formed surface of the liquid discharging head and receives discharged liquid. Electrical change information is acquired by detecting change in an electrical characteristic between a conductive portion of the liquid discharging head and the liquid receiving portion when liquid is discharged. Correlation information shows correlation between the electrical change information and temperatures of discharged liquid. The drive signal generator generates an information acquiring drive pulse. The correlation information shows correlation between the electrical change information obtained when discharging the liquid using the information acquiring drive pulse and the temperatures of the liquid. Based on the correlation information, the temperature of the liquid corresponding to the electrical change information is estimated as an estimated liquid temperature and the drive pulse is thereby corrected. | 04-15-2010 |
20100110130 | Printer System For Providing Pre-Heat Signal To Printhead - A printer system for providing a pre-heat signal to a printhead. The system includes a printhead having a plurality of nozzles and a print engine controller for generating drive signals in accordance with print data defining a print job for the printhead. The system is configured for selectively providing nozzles actuators with a pre-heat signal derived from a combination of signals. One of the signals in the combination is the drive signal from the print engine controller. | 05-06-2010 |
20100134544 | INK JET PRINTING APPARATUS AND INK JET PRINTING METHOD - A voltage pulse that keeps the ejection volume within a specified range is selected for a plurality of print element columns, based on the heater rank and ink temperature information that influences the ejection volume during ink ejection. At this time, the voltage pulse is controlled so that the voltage value of the pulse is equal for a plurality of print element columns at any ink temperature and varies according to the ink temperature. This control process enables pulses of the same voltage value to be applied at all times to a plurality of nozzle columns even if these nozzle columns in the print head have different heater ranks. As a result, the ejection volumes of all nozzle columns can be kept within a specified range with high precision over a wide range of base temperature, without requiring complicated circuit configurations. | 06-03-2010 |
20100141698 | LIQUID DISCHARGING APPARATUS AND LIQUID DISCHARGING METHOD - A liquid discharging apparatus includes: a pressure chamber that is in communication with a nozzle; an element that operates to cause a pressure change in liquid retained in the pressure chamber; and a discharging pulse generating unit that generates a discharging pulse for operating the element to discharge the liquid from the nozzle, wherein the discharging pulse generating unit generates an anterior discharging pulse and a posterior discharging pulse in such a manner that a time period A from the end of the anterior discharging pulse to the start of the posterior discharging pulse satisfies the following formula (1). | 06-10-2010 |
20100149239 | PRINTHEAD IC WITH SUB EJECTION CONTROL - A printhead IC is provided having an array of ejection nozzles, sensing circuitry for sensing a temperature of the nozzle array which is de-activatable after a period of use, and drive circuitry for receiving print data and providing drive pulses to the nozzles to cause ejection in accordance with the print data. The drive circuitry is configured to set the duration of the drive pulses to a sub-ejection value for any nozzle which is not to eject in accordance with the print data. | 06-17-2010 |
20100165027 | IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND COMPUTER-READABLE MEDIUM STORING A PROGRAM - The present invention provides an image forming apparatus including: a rotating body that holds recording medias on a circumferential surface; an image forming section that forms an image; a generating section that generates a pulse and a reference pulse; a measuring section that measures the number of pulses; a computing section that each time when predetermined number of pulses from generation of the reference pulse has been measured, divides a pulse width of a pulse before predetermined number of pulses by a first value to compute a pulse division time; and a controlling section that each time when predetermined number of pulses are measured from generation of the reference pulse, multiplies the pulse division time by a second predetermined value, thereby obtaining a forming start time, and that controls to start image formation when the forming start time has elapsed from the measurement of predetermined number of pulses. | 07-01-2010 |
20100182362 | RECORDING APPARATUS - A recording apparatus includes a recording head having: a discharge port; an actuator; and a driving circuit that selectively supplies to the actuator a discharge driving signal which includes at least one of discharge pulse signals, and a non-discharge driving signal which includes at least one of non-discharge pulse signals. The recording apparatus further includes: a transport unit; an image recording control unit; a signal number calculating unit that calculates the number of non-discharge driving signals; and a non-discharge driving control unit that controls the driving circuit to supply the number of non-discharge driving signals calculated by the signal number calculating unit, wherein the signal number calculating unit calculates the number of non-discharge driving signals such that the sum of the number of correction pulses and the total number of non-discharge pulse signals supplied to the actuator within the predetermined period is equal to a predetermined value. | 07-22-2010 |
20100182363 | LIQUID DISCHARGING APPARATUS AND CONTROL METHOD THEREOF - A liquid discharging apparatus includes: a liquid discharging head which has a pressure generation chamber that is communicated with a nozzle orifice, and a pressure generation element that generates pressure variation in liquid in the pressure generation chamber, and which can discharge liquid from the nozzle orifice by the operation of the pressure generation element; and a driving signal generation section which generates a series of driving signals that includes a driving pulse which drives the pressure generation element, wherein the driving pulse which the driving signal generation section generates includes an expansion element which expands the pressure generation chamber, thereby drawing in the meniscus, a contraction element which varies voltage so as to contract the expanded pressure generation chamber, a re-expansion element which re-expands the pressure generation chamber after the contraction by the contraction element, thereby drawing in the meniscus, and a re-contraction element which varies voltage so as to contract the re-expanded pressure generation chamber, and the re-contraction element includes a first re-contraction element, and a second re-contraction element which contracts the re-expanded pressure generation chamber at a different rate of voltage change from that of the first re-contraction element. | 07-22-2010 |
20100188452 | LIQUID 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. | 07-29-2010 |
20100194804 | LIQUID DISCHARGING APPARATUS AND LIQUID DISCHARGING METHOD - A liquid discharging apparatus is provided, which including: a pressure chamber communicating with a liquid supply portion and each nozzle; an element that performs an operation for providing change of pressure to liquid within the pressure chamber; and a pulse generating section that generates a pulse of which a voltage is changed to operate the element. The pulse generating section generates a first discharge pulse that causes the element to perform an operation for discharging liquid droplets from the nozzles, a non-discharge pulse, generated later than the first discharge pulse, that produces pressure vibration of strength, by which the liquid droplets are not discharged from the nozzles, in the liquid within the pressure chamber, which has a phase different from pressure vibration produced in the liquid within the pressure chamber by applying the first discharge pulse to the element, and a second discharge pulse, generated later than the non-discharge pulse, that causes the element to perform the operation for discharging the liquid droplets from the nozzles, while using the pressure vibration produced in the liquid within the pressure chamber by applying the non-discharge pulse to the element. | 08-05-2010 |
20100214335 | LIQUID DISCHARGING APPARATUS, LIQUID DISCHARGING METHOD, AND DISCHARGE PULSE SETTING METHOD - A liquid discharging apparatus includes: a pressure chamber communicated with a nozzle; an element which performs the operation of imparting a pressure change to liquid in the pressure chamber; and a pulse generation section which generates a preceding discharge pulse and a following discharge pulse that operate the element, and determines a period from the end of the generation of the preceding discharge pulse to the start of the generation of the following discharge pulse in accordance with the liquid droplet amount which is discharged from the nozzle. | 08-26-2010 |
20100328381 | INKJET RECORDING APPARATUS - An inkjet recording apparatus including a recording head having a nozzle, a pressure chamber, and a pressure generation section; and a drive signal generator which generates a drive signal for applying at least one drive pulse, wherein the apparatus ejects the ink droplet from the nozzle by applying the drive signal to activate the pressure generation section, wherein the drive signal generator generates the drive signal within one pixel period in chronological order including a first expansion pulse to expand the volume of the pressure chamber, a contraction pulse, and a second expansion pulse, and wherein a contraction pulse width is 0.1 AL through 0.5AL, where AL represents a half of an acoustic resonance period of the pressure chamber, and |Von|/|Voff| is 1.3 through 10, where Von and Voff respectively represent drive voltages of the first expansion pulse and the contraction pulse. | 12-30-2010 |
20100328382 | INKJET RECORDING APPARATUS AND DRIVE METHOD OF INKJET RECORDING HEAD - An inkjet recording apparatus having: a recording head including a pressure generation section, a pressure chamber, and a nozzle; and a drive signal generator which generates the drive signal including a first expansion pulse, a contraction pulse, and a second expansion pulse, wherein the pulses are generated to satisfy that: a peak value position P | 12-30-2010 |
20110025741 | CONTINUOUS PRINTING USING TEMPERATURE LOWERING PULSES - A printer includes a printhead and a source of liquid. The printhead includes a nozzle bore. The liquid is under pressure sufficient to eject a column of the liquid through the nozzle bore. The liquid has a temperature. A thermal modulator is associated with the nozzle bore. The thermal modulator is operable to transiently lower the temperature of the liquid as the liquid is ejected through the nozzle bore. An electrical pulse source is in electrical communication with the thermal modulator. The electrical pulse source is operable to provide a series of pulses to the thermal modulator that control the transient temperature lowering of the liquid. The series of pulses includes a first pulse applied at a first power level for transferring heat to the liquid, a second pulse applied at a second power level for transferring heat to the liquid, and a third pulse applied at a third power level for transferring heat to the liquid. The third power level is in between the first power level and the second power level. | 02-03-2011 |
20110037797 | 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 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. Each energy pulse has a pulse voltage of less than 10 Volt. | 02-17-2011 |
20110037798 | LIQUID EJECTING APPARATUS AND METHOD OF SETTING SIGNAL FOR MICRO VIBRATION - A liquid ejecting apparatus includes liquid chambers in which a liquid is filled, nozzles communicating with the liquid chambers, a signal generator generating a signal of potential change, and elements operating in accordance with the potential of the signal to be applied to cause a change in pressure in the liquid chambers. The signal generator generates a signal for micro vibration of a free surface of the liquid to be exposed from the nozzles such that the liquid is not ejected. The signal for micro vibration has a first potential change portion at which a potential changes from a first potential to a medium potential between the first potential and a second potential, a subsequent constant potential portion at which the potential is maintained constant at the medium potential, and a subsequent second potential change portion at which the potential changes from the medium potential to the second potential. | 02-17-2011 |
20110050770 | LIQUID EJECTING APPARATUS AND MANUFACTURING METHOD THEREOF - A liquid ejecting apparatus includes liquid ejecting heads, each ejecting a liquid from a nozzle by driving a pressurizing unit that causes the volume of a pressure chamber that communicates with the nozzle to change. A driving pulse generation unit generates driving pulses that drive the respective pressurizing units. A controller controls the ejection of the liquids by the liquid ejecting heads. Each driving pulse includes an ejection element that causes the pressure chamber to constrict, thereby ejecting liquid from the nozzle, and a retraction element that retracts a meniscus at the nozzle toward the pressure chamber by causing the pressure chamber constricted by the ejection element to expand. The controller sets the ending potential of the retraction element on the liquid ejecting head-by-liquid ejecting head basis so that the shapes of dots formed on a ejection target are made uniform throughout the liquid ejecting heads. | 03-03-2011 |
20110063350 | INK JET APPARATUS AND METHOD OF REDUCING CROSSTALK - When ink is ejected from any one of a plurality of pressure chambers, an electric field pulse, which corresponds to an electric field pulse to be applied to a partition wall of the pressure chamber which is to eject the ink, and has at least one square wave, which is in a direction opposite to that of the electric field pulse and has a pulse width corresponding to the electric field pulse, is applied to a partition wall adjacent to the partition wall of the pressure chamber which is to eject the ink. | 03-17-2011 |
20110063351 | IMAGE FORMING APPARATUS - An image forming apparatus includes a recording head having nozzles ejecting liquid droplets, a liquid chamber in communication with the nozzles, a pressure generator unit generating pressure inside the liquid chamber, and a head drive control unit to generate a drive waveform having plural drive pulses arranged in time series, each of the drive pulses having waveform components, to form an ejecting pulse for ejecting the liquid droplets by selecting one or more of the plural drive pulses based on a corresponding one of liquid droplet sizes and supply the formed ejecting pulse to the pressure generator unit. In the image forming apparatus, when the ejecting pulse is formed by selecting one or more of the plural drive pulses, shapes of the waveform components of the selected plural drive pulses are partially changed based on the corresponding one of the liquid droplet sizes. | 03-17-2011 |
20110080444 | LIQUID 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 V | 04-07-2011 |
20110096114 | METHOD AND APPARATUS TO EJECT DROPS HAVING STRAIGHT TRAJECTORIES - Described herein is a method and apparatus for driving a drop ejection device to produce drops having straight trajectories. In one embodiment, a method for driving a drop ejection device having an actuator includes building a drop of a fluid with at least one drive pulse by applying a multi-pulse waveform having the at least one drive pulse and a straightening pulse to the actuator. Next, the method includes causing the drop ejection device to eject the drop with a straight trajectory in response to the pulses of the multi-pulse waveform. The straightening pulse is designed to ensure that the drop is ejected without a drop trajectory error. | 04-28-2011 |
20110109675 | PHASE SHIFTS FOR PRINTING AT TWO SPEEDS - The method includes forming first size drops by applying drop forming pulses during a unit time period τ | 05-12-2011 |
20110109676 | LIQUID EJECTING APPARATUS AND CONTROL METHOD THEREOF - A driving pulse for air bubble removal flushing which is a first maintenance pulse is a driving pulse which removes air bubbles in an ink flow path of a recording head, a driving pulse for thickened ink discharge flushing which is a second maintenance pulse is a driving pulse which removes thickened ink, thereby stabilizing a meniscus, and in a maintenance process which restores ejection capability of the recording head, after an air bubble removal flushing process is executed by using the driving pulse for air bubble removal flushing, a thickened ink discharge flushing process is executed by using the driving pulse for thickened ink discharge flushing. | 05-12-2011 |
20110141172 | SEPARATION OF DRIVE PULSES FOR FLUID EJECTOR - A method for causing fluid to be ejected from a fluid chamber of a jet in a printhead. An actuator is actuated with a first energy imparting pulse to push fluid away from the actuator and toward a nozzle. Following a lapse of a first interval, the actuator is actuated with second energy imparting pulse to push fluid away from the actuator and toward the nozzle. Following a lapse of a second interval as measured from the second energy imparting pulse, the actuator is actuated with a break-off pulse to cause fluid extending out of an orifice of the nozzle to break off from fluid within the nozzle, wherein the second lapse is longer than the first lapse and is an inverse of the meniscus-jet mass frequency. | 06-16-2011 |
20110227977 | METHOD OF MODULATING PEAK POWER FLUCTUATIONS IN MULTI-COLORED PRINTHEAD HAVING RESPECTIVE POWER SUPPLY - A method of printing from a single multi-colored pagewidth inkjet printhead powered by a respective power supply. The printhead has transversely aligned color channels with first nozzles contained in a first color channel and second nozzles contained in a second channel supplied with a same colored ink as the first color channel. The first and second nozzles are configured in sets, such that each nozzle in a set is configurable to print a dot of ink onto a same position on a print medium. The method includes the steps of: (i) providing power sequentially to each nozzle row of the printhead from the power supply; and (ii) printing a line of dots across the print medium such some of the first nozzles and some of the second nozzles each contribute dots to the line. | 09-22-2011 |
20110279502 | INK JET HEAD AND DRIVING METHOD THEREOF - According to one embodiment, an ink jet head has a pressure room that is filled with liquid, a nozzle which ejects the liquid in the pressure room, an actuator which varies a volume of the pressure room, and a processor. The processor outputs a voltage having a waveform which sequentially includes an increasing pulse for increasing the volume of the pressure room, a first decreasing pulse for decreasing the volume of the pressure room, and a second decreasing pulse for decreasing the volume of the pressure room, to the actuator as a driving voltage. | 11-17-2011 |
20110292109 | PRINTHEAD FIRING - Printhead firing methods, apparatus and articles of manufacture are disclosed. An example printhead firing method disclosed herein comprises determining a position of a printer carriage corresponding to a location at which a first encoder strip is concatenated with a second encoder strip, and adjusting timing of printhead firing pulses when the printer carriage is determined to have reached the position as the printer carriage is moved. | 12-01-2011 |
20110298851 | Inkjet head driving apparatus - Disclosed herein is an inkjet head driving apparatus. The inkjet head driving apparatus includes a multi pulse generator that receives a trigger signal, and converts and outputs the trigger signal into a multi pulse signal; an amplifier that amplifies the multi pulse signal output from the multi pulse generator; and a controller that controls the number of pulses of the multi pulse signal generated from the multi pulse generator. | 12-08-2011 |
20110310149 | PRINTHEAD HAVING VARIABLE DRIVE PULSES FOR FLUID EJECTION - A printhead is provided having fluid ejection nozzles, heaters corresponding to each of the nozzles respectively, with each heater heating printing fluid to cause ejection of a drop of the printing fluid through the corresponding nozzle, and circuitry for generating electrical drive pulses having variable power and length for energizing the heaters. The drive pulses are generated to have less energy than the energy required to heat a volume of the printing fluid equivalent to the drop volume, from the temperature at which the printing fluid enters the printhead to the heterogeneous boiling point of the printing fluid. | 12-22-2011 |
20110316917 | LOGICAL AND VIRTUAL NOZZLE-FIRE-RESTART-LINE FOR FLUID-EJECTION DEVICE - A fluid-ejection device includes physical data lines, a controller, and a fluid-ejection mechanism. The physical data lines communicatively connect the controller and the fluid-ejection mechanism. The controller is to assert a logical and virtual nozzle-fire-restart line to denote that a first data sub-packet of a new data packet of nozzle data for a predetermined sequence of fluid-ejection nozzles of the fluid-ejection mechanism is being transmitted over the physical data lines. The fluid-ejection mechanism is to listen for the controller to assert the logical and virtual nozzle-fire-restart line, to discern that the first data sub-packet of the new data packet is being transmitted over the physical data lines. | 12-29-2011 |
20120038696 | SUB-THRESHOLD VOLTAGE PRIMING OF INKJET DEVICES TO MINIMIZE FIRST DROP DISSIMILARITY IN DROP ON DEMAND MODE - The establishment of a stable acoustic environment within the individual channels of an inkjet printing device functions to allow the inkjet printing device to precisely deposit the same amount of a particular substance at one or more locations on an object. This is particularly relevant when the inkjet printing device is operated in the on-demand mode of operation. | 02-16-2012 |
20120062633 | DRIVING APPARATUS AND DRIVING METHOD OF INKJET HEAD - According to one embodiment, a driving apparatus of an inkjet head includes a drive signal output unit, an ejection pulse number decision unit, a pulse addition determination unit, and a drive signal generation unit. The ejection pulse number decision unit decides the number of ejection pulses based on a gradation value of print data. When the pulse addition determination unit has determined that the control pulse is not to be added, the drive signal generation unit generates a drive signal including ejection pulses whose number has been decided by the ejection pulse number decision unit. When the pulse addition determination unit has determined that the control pulse is to be added, the drive signal generation unit generates a drive signal including ejection pulses whose number is smaller than the number decided by the ejection pulse number decision unit. | 03-15-2012 |
20120069071 | IMAGE FORMING APPARATUS SELECTING PULSES TO FORM DRIVE WAVEFORM - An image forming apparatus creates a drive waveform containing a first pulse to discharge the droplet and a second pulse to cause a liquid to flow within a recording head. A data creation part creates data to select a first or second droplet discharge pulse. The first droplet discharge pulse contains the first pulse and the second pulse. The second droplet discharge pulse does not contain the second pulse. When the first or second droplet discharge pulse is selected in a subsequent drive period and when neither the first nor second droplet discharge pulse is selected in a current drive period, the second pulse is selected in the current drive period when selecting the second droplet discharge pulse in the subsequent drive period, and the second pulse is not selected in the current drive period when selecting the first droplet discharge pulse in the subsequent drive period. | 03-22-2012 |
20120069072 | PRINTING DEVICE AND PRINTING METHOD - A printing device includes one or more engines that are attachable to and detachable from the printing device and print an image on a recording medium. Each engine includes a plurality of head modules each having a plurality of heads that eject ink, one or more data transfer control units that control an image data, pixel by pixel, the image data being subjected to print and being transferred from an upper level device, and an output control unit that requests the data transfer control unit to transfer the image data in a pixel order in accordance with an ink ejection order determined by the engine mounted on the printing device, transfers the image data having been transferred in the pixel order to the head module, in the same pixel order, that is subjected to eject ink, and make the head module eject the ink onto the recording medium. | 03-22-2012 |
20120139981 | Thermal Inkjet Printhead And Method - Methods of controllably ejecting liquid from a thermal inkjet printhead. A first pulse set sufficient to form a bubble to eject a drop of a liquid having a polymer phase dispersed in a colloidal suspension is applied to a firing resistor. The first pulse set forms a polymer residue on the firing resistor. After the first pulse set and before a collapse of the bubble, a second pulse insufficient to eject a drop of the liquid is applied to the firing resistor. The second pulse facilitates removal of at least a portion of the residue from the firing resistor. | 06-07-2012 |
20120194586 | INKJET RECORDING DEVICE AND PRINTING HEAD - In an inkjet recording device, nozzles are arranged orthogonally to a deflection direction of deflection electrodes. Ink jetted from each nozzle is charged by a pair of charging electrodes. Charged droplets are deflected by an electric field formed thereby. Voltages applied to each electrode and timings thereof can be independently adjusted. | 08-02-2012 |
20120206520 | RECORDING APPARATUS - A recording apparatus includes a recording head, a roller configured to convey a recording medium, an acquisition unit configured to acquire information about a conveyance amount for conveying the recording medium per a predetermined rotation amount of the roller, a recording timing generation unit configured to generate a plurality of timing signals for performing recording for one raster line according to a rotation of the roller during one rotation thereof, and a drive signal generation unit configured to generate a drive reference signal for performing the recording for the one raster line on the recording medium at a predetermined interval based on the conveyance amount information and the timing signal. | 08-16-2012 |
20120206521 | LIQUID EJECTING APPARATUS AND CONTROL METHOD THEREFOR - A liquid ejecting apparatus includes an ejection unit which includes a pressure chamber and a pressure generation element, and which ejects the liquid through a nozzle of the pressure chamber in accordance with the variation of the pressure inside the pressure chamber; a driving signal generation section; a driving section which causes the liquid to eject through the nozzle by supplying the pressure generation element with an ejection waveform included in the driving signal, and which transmits a slight vibration to the liquid contained in the pressure chamber a plurality of number of times during the driving period of time by supplying the pressure generation element with a plurality of slight vibration waveforms which is included during the driving period of time of the driving signal. | 08-16-2012 |
20120218334 | FIRE PULSE CIRCUIT AND METHOD OF USE - A fire pulse circuit for use in an inkjet printer includes an input control signal transmitted from a controller to a logic AND gate and to fire truncation logic; fire truncation logic adapted to truncate a pulse width of the input control signal to a maximum allowable pulse width if the duration of the pulse exceeds a maximum allowable time; a logic AND gate that receives inputs from both the input control signal and the fire truncation logic to produce an output fire pulse signal that operates to optimally fire an inkjet heater driver logic to heat the heater to nucleate ink from the print head. The circuit is formed from either a combination of digital and analog components or from exclusively digital components. A method of using the circuit to generate an output fire pulse to an inkjet heater driver logic is also disclosed. | 08-30-2012 |
20120242727 | LIQUID EJECTING APPARATUS - A time from a start end of a contraction portion of a first middle dot drive pulse of a first drive signal to a start end of the contraction portion of a second middle dot drive pulse of a second drive signal is set to Tc/2 or more and Tc or less in the same unit period. In addition, a time from a start end of a preliminary portion of a first small dot drive pulse to a start end of a preliminary portion of a second small dot drive pulse is set to Tc or more. Thus, while a piezoelectric vibrator corresponding to the other side of adjacent nozzles is driven by the second drive signal, a piezoelectric vibrator corresponding to one side of adjacent nozzles is driven by the first drive signal. | 09-27-2012 |
20120268513 | FLUID EJECTION USING MEMS COMPOSITE TRANSDUCER - A method of ejecting a drop of fluid includes providing a fluid ejector. The fluid ejector includes a substrate, a MEMS transducing member, a compliant membrane, walls, and a nozzle. The substrate includes a cavity and a fluidic feed. A first portion of the MEMS transducing member is anchored to the substrate. A second portion of the MEMS transducing member extends over at least a portion of the cavity and is free to move relative to the cavity. The compliant membrane is positioned in contact with the MEMS transducing member. A first portion of the compliant membrane covers the MEMS transducing member, A second portion of the compliant membrane being anchored to the substrate. Walls define a chamber that is fluidically connected to the fluidic feed. At least the second portion of the MEMS transducing member is enclosed within the chamber. A quantity of fluid is supplied to the chamber through the fluidic feed. An electrical pulse is applied to the MEMS transducing member to eject a drop of fluid through the nozzle. | 10-25-2012 |
20120274691 | METHOD FOR IMPROVING DROP MORPHOLOGY OF DROPS EJECTED FROM AN INJET DEVICE - A method for improving the morphology of drops ejected from inkjet dispensers results in a more accurate and repeatable process. The method involves shifting the dwell time from one corresponding to the first harmonic of the dispenser to a higher harmonic, for example, the third harmonic. | 11-01-2012 |
20120306953 | PRINTING APPARATUS AND DISCHARGE INSPECTION METHOD - A printing apparatus includes a control unit configured to perform control so as to apply a first driving voltage to a heat generation element to discharge ink from an orifice and then apply a second driving voltage to the heat generation element so as not to cause bubbling or discharging of ink. In this case, the control unit performs control to apply the second driving voltage before detection of a feature point on the waveform of a signal representing temperatures in a temperature drop process detected by the temperature detection element after application of the first driving voltage and along with the application of the first driving voltage based on a temperature detected by a temperature detection element. | 12-06-2012 |
20120306954 | DRIVING DEVICE FOR LIQUID DISCHARGING HEAD, LIQUID DISCHARGING APPARATUS, AND INK JET RECORDING APPARATUS - Present invention provide a driving device of a liquid discharging head, a liquid discharging apparatus, and an ink jet recording apparatus that are capable of realizing a desired dot shape by suppressing the generation of the meniscus without sacrificing the discharge efficiency or the landing accuracy. According to the present invention, in a case where discharging is performed a plurality of times in one recording period, and one pixel is recorded by using a plurality of droplets, by configuring the wave height change time of a rear-end side wave height change part of the final pulse of a plurality of discharge pulses to be equal to or longer than a quarter of the resonant period Tc and configuring the pulse width of the plurality of discharge pulses to be a half of the resonant period Tc. | 12-06-2012 |
20120320118 | METHOD OF CONTROLLING LIQUID EJECTION HEAD, AND LIQUID EJECTION DEVICE - A method of controlling a liquid ejection head controls a liquid ejection head including a liquid pressurizing chamber, nozzles communicating with the liquid pressurizing chamber, and a pressure generating device that generates pressure in the liquid pressurizing chamber based on a drive waveform. The method includes generating a preliminary ejection drive waveform with a predetermined number of successive drive pulses aligned in descending order of length of drive pulse intervals of the drive pulses, with each of the drive pulse intervals set to an integral multiple of a natural vibration period of the liquid pressurizing chamber, and applying the generated preliminary ejection drive waveform to the pressure generating device to cause the liquid ejection head to perform a preliminary ejecting operation. | 12-20-2012 |
20120327150 | METHOD AND DRIVE CIRCUIT FOR DRIVING PIEZOELECTRIC ELEMENT, AND LIQUID-DROPLET EJECTION HEAD - A method for driving a piezoelectric element of a head, including: a step of increasing a voltage of a power source to a reference voltage level; and a step of charging one electrode of two electrodes interposing the piezoelectric element to the reference voltage level by repeating source-connections and source-disconnections between the power source and the one electrode while keeping the voltage of the power source at the reference voltage level, such that a ratio of a connection time of each of at least one of second and subsequent connections of the source-connections to a disconnection time of a corresponding source-disconnection continued from each of the at least one of the second and subsequent connections is greater than a ratio of a connection time of a first connection of the source-connections to a disconnection time of a source-disconnection continued from the first connection. | 12-27-2012 |
20130063507 | IMAGE FORMING APPARATUS INCLUDING RECORDING HEAD FOR EJECTING LIQUID DROPLETS - An image forming apparatus includes a recording head, a head driving control unit, and a dummy ejection control unit. The dummy ejection control unit controls first dummy ejection operation to eject droplets to a continuous medium per a constant length and second dummy ejection operation to eject droplets not contributing to image formation to an image formation area. In the first dummy ejection operation, the head driving control unit applies a first non ejection pulse to a pressure generator corresponding to a non ejection nozzle. In the second dummy ejection operation, the head driving control unit applies a second non ejection pulse to the pressure generator corresponding to the non ejection nozzle. When the second non ejection pulse is applied, an amplitude or number of vibrations of a meniscus of liquid in the non ejection nozzle is greater than when the first non ejection pulse is applied. | 03-14-2013 |
20130063508 | DRIVING METHOD AND APPARATUS OF AN INK JET HEAD - According to one embodiment, a driving method of an ink jet head includes applying a first pulse for expanding volume of a pressure chamber in which an ink is accommodated to an actuator for applying oscillation to the pressure chamber and applying a second pulse for reducing volume of the pressure chamber to the actuator immediately before ink drops discharged from a nozzle which is communicated with the pressure chamber are separated from the nozzle. | 03-14-2013 |
20130063509 | LIQUID 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. | 03-14-2013 |
20130070010 | IMAGE FORMING APPARATUS WITH INK-JET PRINTING SYSTEM - An image forming apparatus comprises a printing head unit, a driving waveform generator that generates and outputs a driving waveform having four or more driving pulses in chronological order per driving cycle, and a selector that selects and applies one of multiple driving pulses to a pressure generator to cause a printing head unit to selectively discharge a liquid droplet of three or more different sizes. The driving waveform includes three or more driving pulses at least having a final driving pulse to collectively discharge the biggest liquid droplet. The driving waveform includes a micro-driving pulse for discharging a smallest droplet within a time period of from about 2×Tc to about 4×Tc after the driving waveform starts being outputted when Tc represents a natural vibration period of a separate liquid chamber of the printing head unit. | 03-21-2013 |
20130083109 | LIQUID EJECTION APPARATUS - A liquid ejection apparatus includes: a passage unit, a piezoelectric actuator, a drive signal generator, a driver, a voltage value changing unit, and an interval setting unit. The piezoelectric actuator applies energy to liquid in the passage unit. The drive signal generator generates a drive signal to be supplied to the piezoelectric actuator, based on a reference voltage value. The driver supplies the drive signal generated by the drive signal generator to the piezoelectric actuator. The voltage value changing unit changes the reference voltage value to a larger voltage value every time an accumulated time during which a voltage is applied between electrodes of the piezoelectric actuator satisfies a predetermined condition. The interval setting unit determines a new time interval to a next change of the reference voltage so that the new time interval is shorter than before, every time the reference voltage value is changed. | 04-04-2013 |
20130187966 | Liquid Ejecting Apparatus and Liquid Ejecting Method - A liquid ejecting apparatus which includes an origin drive signal generation unit which generates the origin drive signal; a signal modulation unit which modulates the origin drive signal, and sets as an origin modulation signal; a signal amplification unit which amplifies the origin modulation signal, and sets as a modulation signal; a signal conversion unit which converts the modulation signal to fire drive signal; and a liquid ejecting unit which ejects liquid according to the fire drive signal, in which a frequency of the origin modulation signal, or the fire modulation signal is set to a predetermined value when the origin drive signal is a first value or more, and a second value or less, and when the origin drive signal is other than that, the frequency is set to a value which is less than the predetermined value. | 07-25-2013 |
20130187967 | Liquid Ejecting Apparatus and Liquid Ejecting Method - A liquid ejecting apparatus which includes: an origin drive signal generation unit which generates an origin drive signal; a signal modulation unit which modulates the origin drive signal, and makes the origin drive signal as an origin modulation signal; a signal amplification unit which amplifies the origin modulation signal, and makes the origin modulation signal as a modulation signal; a signal conversion unit which converts the modulation signal to a fire drive signal, and a liquid ejecting unit which ejects liquid according to the fire drive signal, in which a frequency of the origin modulation signal, or the fire modulation signal becomes maximum when the origin drive signal is a predetermined value. | 07-25-2013 |
20130235103 | METHOD OF ADJUSTING DROP VOLUME - A method for operating a jetting module includes applying to a drop forming mechanism a sequence of drop formation waveforms in which a small-drop waveform applied after another identical small-drop waveform causes a small drop of volume Vs to be formed; applying a large-drop waveform after another identical large-drop waveform causes a large drop of volume V | 09-12-2013 |
20130235104 | INKJET PRINTING APPARATUS AND DRIVING METHOD - Provided are an inkjet printing apparatus, whereby pulse drive periods and a pause period can be adjusted so as to fall within predetermined periods, while the volume of ink to be ejected is ensured, and a heat generating element driving method therefor. For the inkjet printing apparatus, a pulse signal drive period for a pulse driven previously, a pulse signal drive period for a pulse driven subsequently and a pause period are set to perform ejection of ink droplets one time. When the ejection period exceeds the threshold value, the pulse signal drive period for the pulse driven subsequently and the pause period are reduced to adjust the ejection period to be equal to or lower than a threshold value. | 09-12-2013 |
20130249987 | Ring Electrode for Fluid Ejection - Methods, systems, and apparatus for drive a pumping chamber of a fluid ejection system are disclosed. In one implementation, the actuator for drive the pumping chamber includes a continuous piezoelectric layer between a pair of drive electrodes and a continuous reference electrode. The pair of drive electrodes includes an inner electrode and an outer electrode surrounding the inner electrode. The actuator is further coupled to a controller which, during a fluid ejection cycle, applies a negative voltage pulse differential to the outer electrode to expand the pumping chamber for a first time period, then applies another negative voltage pulse differential to the inner electrode during a second time period after the first time period to contract the pumping chamber to eject a fluid drop. | 09-26-2013 |
20130314465 | PRINTING SYSTEM AND RELATED METHODS - In one embodiment, a printing system includes a printhead module that has a printhead and a regulator chamber. The regulator chamber contains ink and a regulator air bag. The regulator air bag and the printhead are in fluid communication with the ink, and the printhead includes a plurality of ejection nozzles. The printing system includes a pressure source to inflate the air bag, thereby displacing an amount of ink sufficient to agitate menisci in the ejection nozzles without pushing ink out of the nozzles. | 11-28-2013 |
20140035979 | Liquid Ejecting Apparatus and control Method Thereof - A liquid ejecting apparatus includes a drive signal generation section which generates a drive signal and a liquid ejecting head. The drive signal is a periodic signal. One period of the drive signal has two durations of (i) a droplet ejection duration with a waveform part used to eject the droplet from the nozzle and (ii) a droplet non-ejection duration without the waveform part used to eject the droplet from the nozzle, and the droplet non-ejection duration is equal to or longer than the droplet ejection duration. | 02-06-2014 |
20140055513 | Liquid Ejection Apparatus And Control Method For Liquid Ejection Apparatus - A printer controller outputs plural drive signals including respective series of drive pulses, the timing points of which are different from one another, to a head control unit side, and outputs a multiplexed signal resulting from multiplexing change signals corresponding to the respective drive signals to a head control unit side, and the head control unit includes a control signal demultiplexing unit which demultiplexes the multiplexed signal into the change signals corresponding to respective nozzle rows, and an actuator control unit which, on the basis of each of the demultiplexed change signals, selects one of the drive pulses included in one of the drive signal which corresponds to the demultiplexed change signal, and applies the selected drive pulse to a piezoelectric element included in one of the nozzle rows which corresponds to the drive signal corresponding to the demultiplexed change signal. | 02-27-2014 |
20140111571 | LIQUID 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. | 04-24-2014 |
20140125722 | LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a piezoelectric element, a nozzle that ejects a liquid in association with the driving of the piezoelectric element, a driving signal generation unit that generates a driving signal for driving a plurality of the piezoelectric elements, and a residual vibration detection unit that detects residual vibration generated by the driving of the piezoelectric element. The driving signal includes an ejection pulse for ejecting a liquid, a first vibration damping pulse that suppresses residual vibration generated by the ejection pulse, a second vibration damping pulse which is a pulse different from the first vibration damping pulse and suppresses residual vibration generated by the ejection pulse, and an inspection pulse for detecting the residual vibration signal. | 05-08-2014 |
20140168300 | LIQUID EJECTING DEVICE, LIQUID EJECTING METHOD AND RECORDING MEDIUM STORING PROGRAMS FOR LIQUID EJECTING DEVICE - A liquid ejecting device has a liquid ejecting head to eject ink to a sheet-like object, a carriage mounting the liquid ejecting head, a conveying device which conveys the sheet-like object with holding the sheet-like object to have a corrugated shape having a corrugated cross-section in the scanning direction, a detecting unit which detects an end portion of the sheet-like object in the scanning direction, and a processor. The processor is configured to execute instructions to provide an ejection timing determining unit configured to determine an ejection timing at which the liquid is ejected from the liquid ejecting head in accordance with positional information representing the end portion detected by the detecting unit and reference information, and an ejection control unit configured to control the liquid ejecting head and the carriage to eject the liquid from the liquid ejecting head at the timing determined by the ejection timing determining unit. | 06-19-2014 |
20140184677 | INK JET PRINTING - In general, in one aspect, the invention features a method of driving an inkjet module having a plurality of ink jets. The method includes applying a voltage waveform to the inkjet module, the voltage waveform including a first pulse and a second pulse, activating one or more of the ink jets contemporaneously to applying the first pulse, wherein each activated ink jet ejects a fluid droplet in response to the first pulse, and activating all of the ink jets contemporaneously to applying the second pulse without ejecting a droplet. | 07-03-2014 |
20140218428 | IMAGE FORMING APPARATUS AND METHOD OF DRIVING LIQUID EJECTING HEAD - An image forming apparatus includes: a liquid ejecting head including a nozzle that ejects a droplet and a pressure producing unit that produces pressure to pressurize a pressure chamber communicating with the nozzle; and a head drive controlling unit that provides a driving signal to the pressure producing unit. The head drive controlling unit outputs the driving signal including at least a first driving pulse and a second driving pulse to eject droplets and a residual vibration suppressing pulse to suppress residual vibration in the pressure chamber without ejecting a droplet. The residual vibration suppressing pulse is output at such a timing that the residual vibration suppressing pulse has an opposite phase to a composite vibration Vab that is formed by superposition of a meniscus vibration Va generated by droplet ejection with the first driving pulse and a meniscus vibration Vb generated by droplet ejection with the second driving pulse. | 08-07-2014 |
20140240384 | IMAGE FORMING APPARATUS AND METHOD OF DRIVING AND CONTROLLING HEAD - An image forming apparatus includes a liquid ejection head including a pressure generation unit configured to generate a pressure for pressurizing a liquid in an individual liquid chamber communicating nozzles; and a head drive control unit configured to generate a drive waveform including pulses in time series, select one or more pulses from the drive waveform according to a droplet size, and provide the selected drive pulses to the pressure generation unit. The drive waveform includes a first pulse not including a waveform component that suppresses ejection bending, and allowing a droplet to be ejected, and a second pulse including the waveform component that suppresses ejection bending, and allowing a droplet to be ejected. An amount of the droplet ejected in the second pulse is larger than in the first pulse, and a speed of the droplet ejected in the second pulse is higher than that in the first pulse. | 08-28-2014 |
20140253619 | INK JET HEAD AND INK JET PRINTING APPARATUS WITH DRIVING CHANNELS AND DUMMY CHANNELS - An ink jet head includes a plurality of nozzles and a piezoelectric member provided with driving channels for storing ink. Each of the driving channels communicates a respective one of the nozzles. Dummy channels are alternately arranged with the driving channels. First side walls between the driving and dummy channels include a first driving channel side surface and a first dummy side surface. Second side walls between the driving channels and the dummy channels include a second driving channel side surface and a second dummy channel side surface. When a voltage is applied to electrodes on the first dummy channel side surfaces, the corresponding first side wall is deformed. When a voltage is applied to electrodes on the second dummy channel side surfaces, the second side wall is deformed. | 09-11-2014 |
20140253620 | IMAGE RECORDING APPARATUS, IMAGE RECORDING METHOD, AND RECORDING MEDIUM STORING A PROGRAM FOR RECORDING IMAGE - An image recording apparatus that includes a recording head controller that transfers image data and a driving waveform to a recording head in conjunction with position information of the recording head. The recording head controller includes a driving waveform storage unit that stores multiple driving waveform data, a number of driven nozzles calculator that calculates the number of nozzles driven simultaneously from the image data, and a driving waveform selector that selects one driving waveform data from the multiple driving waveform data based on the calculated number of driven nozzles and a predetermined threshold value of the number of driven nozzles. | 09-11-2014 |
20140267481 | METHOD, APPARATUS, AND SYSTEM TO PROVIDE DROPLETS WITH CONSISTENT ARRIVAL TIME ON A SUBSTRATE - Described herein is a method, apparatus, and system for driving a droplet ejection device with multi-pulse waveforms. In one embodiment, a method for driving a droplet ejection device having an actuator includes applying a first subset of a multi-pulse waveform to the actuator to cause the droplet ejection device to eject a first droplet of a fluid in response to the first subset. The method includes applying a second subset of the multi-pulse waveform to the actuator to cause the droplet ejection device to eject a second droplet of the fluid in response to the second subset. The first subset includes a drive pulse that is positioned in time near a beginning of a clock cycle of the first subset. The first droplet has a smaller volume than the second droplet. | 09-18-2014 |
20140285553 | LIQUID DISCHARGE APPARATUS - A liquid discharge apparatus includes first and second discharge sections, first and second connection paths and a voltage generation section. Each of the first and second discharge sections has a nozzle configured and arranged to discharge a liquid, a pressure chamber in communication with the nozzle, and a piezoelectric element. The first connection path selection section is arranged so as to correspond to the first discharge section and configured to selectively supply a plurality of voltages to the first discharge section. The second connection path selection section is arranged so as to correspond to the second discharge section and configured to selectively supply a plurality of voltages to the second discharge section. The voltage generation section is configured to generate and supply the voltages shared by the first connection path selection section and the second connection path selection section. | 09-25-2014 |
20140285554 | IMAGE FORMING APPARATUS AND HEAD DRIVE CONTROL METHOD - A head drive control unit generates and outputs a pulse formed of a first expansion waveform element to expand individual liquid chambers, a first contraction waveform element to contract the individual liquid chambers, a second expansion waveform element to expand the individual liquid chambers, and a second contraction waveform element to return the individual liquid chambers that have repeatedly expanded and contracted to an initial state. The first contraction waveform element serves as a waveform element that contracts the individual liquid chambers at a timing of resonance with a change in a pressure in the individual liquid chambers due to the first expansion waveform element. The second contraction waveform element serves as a waveform element that suppresses the change in the pressure in the individual liquid chambers. | 09-25-2014 |
20140285555 | Liquid Discharging Apparatus - Each of M head units of a print head includes a driving signal generator and a plurality of piezoelectric elements. A common control signal is supplied from a control signal supply portion of a control unit to the respective driving signal generators of the M head units. The driving signal generator of each head unit generates a driving signal from the control signal according to characteristics (for example, relationship of a deformation amount with respect to an applied voltage) of each latter stage piezoelectric element and supplies the driving signal to each piezoelectric element. | 09-25-2014 |
20140292856 | PROTECTIVE CIRCUIT FOR INKJET PRINTHEAD - An inkjet printhead includes an array of resistive heaters; an array of nozzles associated with the array of resistive heaters; a heater voltage input for providing a heater voltage; a fire control pulse input for providing a fire control pulse having a first pulsewidth for controlling a length of time that current from the heater voltage input is allowed to pass through at least one of the resistive heaters; and a protective circuit configured to receive the fire control pulse from the fire control pulse input, and to override the fire control pulse if the first pulsewidth is greater than or equal to a predetermined length of time. | 10-02-2014 |
20140292857 | METHOD FOR PROTECTING INKJET PRINTHEAD FROM LONG PULSES - A method of operating an inkjet printing system includes turning a heater voltage power source providing drop generation power to an inkjet printhead on or off under direction of a controller; providing a fire control pulse for setting a duration of passage of current from the heater voltage power source through one or more resistive heaters for generation of one or more drops of ink under direction of the controller; inputting the fire control pulse into a protective circuit; and overriding the fire control pulse in the setting of the duration of passage of current from the power source through the one or more resistive heaters if the pulsewidth of the fire control pulse is greater than or equal to a predetermined length of time. | 10-02-2014 |
20140327714 | IMAGE FORMING APPARATUS AND METHOD FOR CONTROLLING LIQUID DROPLET DISCHARGE HEAD - An image forming apparatus includes: a liquid droplet discharge head; a pressure generator; and a driving waveform generator configured to generate a driving waveform including a plurality of pulse units for driving the pressure generator for discharging a liquid droplet. The pulse unit includes one or more first pulses, and one or more second pulses arranged after the first pulses for discharging a liquid droplet. The second pulse has a pulse width that is set in advance to generate a resonance with the liquid droplet discharge head. The first pulse has a pulse width different from the pulse width of the second pulse. | 11-06-2014 |
20150049136 | METHOD, APPARATUS, AND SYSTEM TO PROVIDE MULTI-PULSE WAVEFORMS WITH MENISCUS CONTROL FOR DROPLET EJECTION - A method, apparatus, and system are described herein for driving a droplet ejection device with multi-pulse waveforms. In one embodiment, a method for driving a droplet ejection device having an actuator includes applying a multi-pulse waveform with a drop-firing portion having at least one drive pulse and a non-drop-firing portion to an actuator of the droplet ejection device. The non-drop-firing portion includes a jet straightening edge having a droplet straightening function and at least one cancellation edge having an energy canceling function. The at least drive pulse causes the droplet ejection device to eject a droplet of a fluid. | 02-19-2015 |
20150070425 | INKJET HEAD - An inkjet head includes a plurality of pressure chambers, each in communication with an ink supply, a plurality of piezoelectric members configured to deform to vary the volume of the pressure chambers, and drive unit that applies a driving signal to each of the piezoelectric members. The driving signal includes, in order, a first negative voltage over a first period having a predetermined length, a first positive voltage followed by a zero voltage over a second period having the same length, a second positive voltage over a third period having the same length, the zero voltage followed by a second negative voltage over a fourth period having the same length, and the zero voltage over a fifth period having the same length. The predetermined length is a half of an inherent vibration cycle of ink that is within the pressure chamber. | 03-12-2015 |
20150091962 | LIQUID DISCHARGE APPARATUS AND LIQUID DISCHARGE METHOD - A liquid discharge apparatus is provided, comprising a channel structure; a piezoelectric actuator which has a plurality of individual electrodes, a common electrode, and a piezoelectric layer sandwiched between the individual electrodes and the common electrode; and a driving device which drives the piezoelectric actuator. The driving device outputs an individual driving signal which causes a change of an electric potential of the individual electrode, to the individual electrode corresponding to the nozzle for discharging the liquid. Further, the driving device outputs a common driving signal which causes a change of an electric potential of the common electrode in synchronization with the change of the electric potential of the individual electrode into which the individual driving signal is inputted, to the common electrode. | 04-02-2015 |
20150116403 | INK JET HEAD - In accordance with one embodiment, an ink jet head comprises a driving signal generator configured to apply rectangular waveform electric field pulse to a partition wall forming a pressure chamber for ejecting ink; wherein the driving signal generator applies, to a second partition wall adjacent to a first partition wall forming the pressure chamber for ejecting ink and a third partition wall adjacent to the second partition wall, electric field pulse including at least one rectangular waveform which is a rectangular waveform opposite to the electric field pulse applied to the adjacent first partition wall and has a pulse width determined based on the electric field pulse at the timing corresponding to the electric field pulse applied to the first partition wall, in a case of ejecting ink from any of the plurality of pressure chambers. | 04-30-2015 |
20150367634 | ACCOUNTING FOR OSCILLATIONS WITH DROP EJECTION WAVEFORMS - Accounting for oscillations with drop ejection waveforms can include identifying a previous ejection waveform having a first plurality of parameters including a time interval from a final pulse of the previous ejection waveform. Accounting for oscillations with drop ejection waveforms can include determining a second plurality of parameters based on the first plurality of parameters, where the second plurality of parameters define a current ejection waveform that accounts for oscillations caused by the previous ejection waveform. Accounting for oscillations with drop ejection waveforms can include applying the current ejection waveform to cause an ejection nozzle of the printhead to generate a desired fluid drop. | 12-24-2015 |
20150375504 | IMAGE FORMING APPARATUS AND HEAD DRIVE METHOD - An image forming apparatus includes a liquid discharging head unit including multiple nozzles to discharge liquid droplets, individual liquid chambers communicated to the multiple nozzles, and pressure generating units to generate pressure applied to a liquid in the individual liquid chambers; and a head drive control unit to generate a common driving waveform including multiple discharging pulses arranged in time series within one driving cycle of discharging liquid droplets of the liquid, to select at least one of the multiple discharging pulses from the common driving waveform, and to apply the selected at least one of the discharging pulses to the pressure generating units. The common driving waveform, generated by the head drive control unit, include at least a first discharging pulse and a second discharging pulse for discharging liquid droplets of same size. | 12-31-2015 |
20160082722 | DRIVE METHOD AND DRIVE APPARATUS FOR INK JET HEAD - In accordance with an embodiment, a drive method for an ink jet head comprising: a drive pulse, applying a first pulse for increasing and then restoring the volume of a pressure chamber and giving pressure vibration to the chamber in which ink are accommodated, and then a second pulse for reducing and then restoring the volume of the pressure chamber to an actuator arranged corresponding to the pressure chamber; wherein the second pulse is turned on at first point of time causing the pressure vibration amplitude at second point of time to be the same with that of generated by the first pulse when the first pulse is turned on, wherein the second point of time is the time when flow velocity of the ink nearby the nozzle inside the pressure chamber becomes 0 after the first point of time, and the second pulse is turned off at the second point of time. | 03-24-2016 |
20160114578 | PRINTHEAD CALIBRATION AND PRINTING - The invention relates to a method of printing a two-dimensional bit-mapped image having a number of pixels per row, the printhead having a row of ejection channels and each ejection channel having associated ejection electrodes to which voltages are applied in use. During printing, in order to cause volumes of fluid to be ejected from selected ejection channels of the printhead for printing, voltage pulses having values of predetermined amplitude and duration as determined by respective image pixel bit values generated by a raster image processor are applied, at a given pulse period, to the electrodes of the selected ejection channels. The part of the raster image corresponding to an ejection channel is scanned to determine the number of adjacent non-printing pixel periods prior to a pixel to be printed and, immediately prior to the printing of said pixel, a voltage pulse, having a value predetermined in accordance with the time, measured in units of the given pixel period, between the last pixel to be printed and said pixel to be printed, is applied to the ejection electrode. | 04-28-2016 |
20160129688 | METHOD OF EJECTING INK DROPLETS HAVING VARIABLE DROPLET VOLUMES - A method of ejecting an ink droplet from an inkjet nozzle device having an actuator and a meniscus pinned across a nozzle opening. The method includes the steps of: delivering a sub-ejection pulse to the actuator for perturbing the meniscus from a quiescent state; and subsequently delivering an ejection pulse to the actuator at an instant when the meniscus is perturbed from its quiescent state, the ejection pulse ejecting the ink droplet from the nozzle opening. A time period between a trailing edge of the sub-ejection pulse and a leading edge of the ejection pulse controls a droplet volume of the ejected ink droplet. | 05-12-2016 |
20160375683 | LIQUID JETTING DEVICE - A liquid jetting device comprising a plurality of ejection units each of which is arranged to eject a droplet of a liquid and comprises a nozzle, a liquid duct connected to the nozzle and an electro-mechanical transducer arranged to create an acoustic pressure wave in the liquid in the duct, the device further comprising an electronic control system arranged to receive a pressure signal from at least one of the transducers and to generate a transducer control signal on the basis of the received pressure signal and to control the transducers of said plurality of ejection units to operate in a mode of operation selected from a variety of different modes of operation, wherein the control system is arranged to detect an acoustic property of the liquid of the basis of the received pressure signal and to select the mode of operation in accordance with the detected property, the control system being arranged to deliver transducer control signals to the transducers, which control signals are derived from a common basic waveform that is specified by mode parameters, each mode of operation of the device is specified by a different set of mode parameters, the waveform comprises a jetting pulse and quench pulse following on the jetting pulse, and one of the mode parameters is a time delay between the start of the jetting pulse and the start of the quench pulse. | 12-29-2016 |
20180022089 | DRIVE SIGNAL ADJUSTMENT METHOD OF LIQUID EJECTING HEAD AND LIQUID EJECTING APPARATUS | 01-25-2018 |