Abstract: With an appropriate signal transmission form, a drive pulse output circuit is mounted to an ink jet head, so that waveform distortion of an actuator drive pulse for jet of ink drops is inhibited or prevented. Modulated signal data in memory is read to output a modulated signal, which is power-amplified by a digital power amplifier. The amplified digital signal is smoothed to be output to an actuator as a drive pulse. As a result, the digital power amplifier having high amplification efficiency efficiently amplifies the power of the modulated signal, thereby eliminating the need to use a cooling unit. The drive pulse output circuit can be mounted to the ink jet heads, thereby shortening the transmission path of an actuator drive pulse, which inhibits or prevents any waveform distortion of the drive pulse. The transmission of the modulated signal data DATA is implemented with a low frequency.

Abstract: 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.

Abstract: 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.

Abstract: A method of projecting liquid as jets or droplets from a nozzle provided on a transducer formed by a region of a material layer, the method comprising the steps of: supplying liquid to an inner end of the nozzle; exciting the nozzle to cause movement of the nozzle in a direction substantially aligned with the nozzle axis in order to project liquid as a droplet from an outer face of the nozzle; wherein the step of exciting the nozzle comprises sequentially driving the transducer with a first rising voltage change, a first falling voltage change, a second rising voltage change and a second falling voltage change; and wherein the first rising voltage change and the first falling voltage change are timed so that they enhance the movement of the material layer, and the second rising voltage change and the second falling voltage change are timed so that they substantially cancel the movement of the material layer.

Abstract: Provided is an ink jet head driving apparatus which can highly accurately control jetting timing separately for each of a plurality of nozzles of a head without increasing the number of signal lines and can change the jetting timing for each jetting cycle.

Abstract: Apparatus and methods for producing a drop from a Drop on demand (DOD) dispenser, the drop having a radius that is much smaller than the radius of the nozzle that expels the drop. Generally, the Ohnesorge number is less than about 0.1. Various embodiments of the invention are found within a four dimensional space defined in terms of the Ohnesorge number, the Weber number, the actuation frequency, and the initial conditions.

Abstract: For a temperature adjustment process that uses high viscosity ink and is based on a first table, in a low temperature environment, an ink refill failure may occur and lower density may appear in high duty printing. Also for a temperature adjustment process that uses high viscosity ink and is based on second and third tables, in a low temperature environment, an ink refill failure may occur and lower density may appear. On the other hand, for a temperature adjustment process that employs a fourth table, a smaller pre-heat pulse width than that for the first table, for the conventional temperature adjustment, is employed in the same low temperature environment. Therefore, an ink refill failure does not occur, and horizontal or vertical gaps do not appear during high duty printing.

Abstract: An element substrate capable of obtaining a high-quality printed image for a long period. The element substrate has a plurality of heaters, driving elements each of which is provided in correspondence with each of the plurality of heaters to selectively drive the plurality of heaters, an input terminal to receive a driving mode selection signal, and a block selection circuit which time-divisionally drives, in blocks of different timings, heaters in each of a plurality of groups each including a predetermined number of heaters and driving elements. The element substrate includes a logic circuit which time-divisionally drives the heaters in the group when the selection signal input from the input terminal is a signal for selecting a first driving mode, and simultaneously drives all heaters in the group when the selection signal is a signal for selecting a second driving mode.

Abstract: While a conveying error of a roller depends on the eccentricity of the roller, the amount and the state of the eccentricity sometimes makes the roller have different conveying errors from one point in the longitudinal direction of the roller to another. There is provided a construction for obtaining a correction value that is suitable for the correction of the conveying error even in such a case as described above. To this end, plural test patterns are formed in the longitudinal direction of the roller. Then, a suitable correction value for correcting the conveying error that depends on the eccentricity of the roller is obtained on the basis of these test patterns.

Abstract: A signal generating device to be installed in a liquid ejecting apparatus which comprises a liquid ejector operable to eject liquid and a carriage operable to carry the liquid ejector, the signal generating device comprising: a first generator to generate first pulse signals at first intervals corresponding to a velocity of the carriage; an estimator to estimate an interval of the first pulse signals which will be generated by the first generator based on a variation of an acceleration of the carriage as a second interval; a second generator to generate second pulse signals at third intervals which are obtained by dividing the second interval; and a third timing signal generator to generate a timing signal determining a timing at which the liquid is ejected from the liquid ejector, based on the second pulse signals.

Abstract: A liquid ejecting apparatus includes: a liquid ejecting head which includes nozzles, pressure generating chambers communicating with the nozzles, and pressure generating elements causing a pressure change in a liquid of the pressure generating chambers and which ejects the liquid from the nozzles in response to an operation of the pressure generating elements; and a driving signal generating unit which drives the pressure generating elements to repeatedly generate a driving signal containing an ejection driving pulse used to eject the liquid from the nozzles.

Abstract: A printing apparatus is provided with a line-type ink jet head having a plurality of blocks on each of which a set of ink ejection elements are arranged. A drive signal generating unit is configured to generate a drive voltage signal including a prepulse to be applied to the set of the ink ejection elements for each block, based on data indicating a number of times of ejecting ink to each pixel; and a first storage unit is configured to store a drive signal adjustment value to adjust a set of a voltage value of the drive voltage signal and a width of the prepulse for each block. The drive signal generating unit generates the drive voltage signal for each block, based on the drive signal adjustment value for each block read out from the first storage unit.

Abstract: A method for discharging a liquid material includes performing a scan by moving a discharge target having a film formation area and a plurality of nozzles forming a nozzle row, and discharging a liquid material containing a functional material from the nozzles onto the film formation area by selectively applying one of drive waveforms generated using time division to an energy generation element in synchronization with the scan. The method includes applying a first drive waveform to a first nozzle and a second drive waveform having a different discharge timing to a second nozzle with the second nozzle being adjacent to the first nozzle, and setting the combination of the first and second drive waveforms so that the number of the energy generation elements to which the first drive waveform is applied is the same as the number of the energy generation elements to which the second waveform is applied.

Abstract: A contraction portion of a vibration pulse includes a first contraction element which occurs subsequent to an expansion portion, a contraction maintaining element which follows the first contraction element, and a second contraction element which follows the contraction maintaining element, and when a time from a start point time of the expansion portion to an end point time of the expansion portion is set as t1, a time from the end point time of the expansion portion to a start point time of the contraction portion is set as t2, and a natural vibration period of ink in an ink flow path including a pressure chamber is set as Tc, the start point time (t1+t2) of the contraction portion is set to be in the range of any one of the following expressions (1) and (2).

Abstract: A recording apparatus includes a calculator, a predictor, and a head controller. Assuming that first ejection signals are supplied to a recording head, the calculator calculates variations in total amount of liquid to be ejected, for respective constant periods of time. The predictor predicts, based on one or more calculated variations, whether a pressure difference between the atmosphere and liquid falls below a threshold value, the atmosphere and the liquid sandwiching a meniscus formed in one of the ejection openings. When the predictor predicts that the pressure difference falls below the threshold value, the head controller controls signal supply to the recording head so that second ejection signals are supplied to the recording head, the second ejection signals having a lower frequency than first ejection signals.

Abstract: An image recording apparatus includes: a recording head having plural recording elements; a characteristics information acquisition device; a correction calculation device which corrects image data using recording point positional deviation information within acquired characteristics information, and generates image data suppressing a non-uniformity streak in an output image; a nearest recording point specifying device specifying, when image density is outside an output image density range, a second recording element concerning a recording position nearest to a recording position of a first recording element corresponding to first image data outside the output image density range; a sum density calculation device calculating sum density of the first image data and second image data; an image data modification device which preserves the calculated slim density; and a drive control device controlling driving of the recording head in accordance with the corrected image data and modified image data.

Abstract: The printing method includes the following steps of: preparing a printing apparatus that includes an element that is driven in order to form a dot, a first drive signal generation section that generates drive signals for driving the element, and a second drive signal generation section that generates drive signals for driving the element; at a certain timing, forming a dot of a predetermined size by generating a first drive signal with the first drive signal generation section and by generating a second drive signal that is different from the first drive signal with the second drive signal generation section; and at a separate timing, forming a dot of the predetermined size by generating the first drive signal with the second drive signal generation section. With this printing method, the first drive signal generation section and the second drive signal generation section can be made to generate an equal amount of heat.

Abstract: A liquid droplet ejection head comprises an ejector, a liquid viscosity-increase prevention structure and a liquid viscosity-increase prevention controller. The ejector includes a nozzle for ejecting a liquid droplet, a pressure chamber communicating with the nozzle through a communication path, and an actuator for applying pressure to a liquid in the pressure chamber. The liquid viscosity-increase prevention structure prevents an increase of viscosity of the liquid in the ejector. The liquid viscosity-increase prevention controller changes the operation frequency of the liquid viscosity-increase prevention structure between when the liquid droplet is ejected from the nozzle and when ejection of the liquid droplet is paused and no liquid droplet is being ejected from the nozzle.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An object of this invention is to decrease the amount of ink mist while keeping the image quality high in inkjet printing. To achieve this object, printing is performed by time-divisionally driving, for each block, a plurality of nozzles for discharging ink. In preliminary discharge, the nozzles are so driven as to set the driving time interval between neighboring nozzles to the first time interval. In printing, the nozzles are so driven as to set the driving time interval between neighboring nozzles to the second time interval longer than the first time interval.

Abstract: A printhead is provided having a plurality of rows of nozzles, with the nozzles in each row being grouped into fire groups, and a controller configured to fire the nozzles of each fire group by outputting firing pulses to the nozzles. The controller sets the number of fire groups in each row based on the width of the firing pulses and a predetermined length of time for firing all of the nozzles of that row.

Abstract: A method for discharging a liquid material includes performing a scan by moving a discharge target having a film formation area and a plurality of nozzles forming a nozzle row with respect to each other, and discharging a liquid material as droplets from the nozzles onto the film formation area by selectively applying one of drive waveforms generated using time division to an energy generation element of each of the nozzles in synchronization with the scan. The discharging of the liquid material includes applying a first drive waveform to a first nozzle of the nozzle row and a second drive waveform having a different discharge timing from the first drive waveform to a second nozzle of the nozzle row with the second nozzle being adjacent to the first nozzle, and changing a combination of the first and second drive waveforms selected from the drive waveforms at least once.

Abstract: 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.

Abstract: A recording apparatus for discharging ink from a recording head arraying a plurality of nozzles to execute recording of an image includes a drive unit configured to form a group with a defined number of nozzles so as to include an adjacent nozzle in a different block and to execute time-division driving of the block according to a driving order corresponding to a recording mode, and a recording control unit configured to execute scan recording to a recording medium in a first recording mode or a second recording mode. Each pass of scan recording in the second recording mode is executed using nozzles smaller in number than a number of nozzles used to execute each pass of scan recording in the first recording mode.

Abstract: Aspects of the disclosure relate to 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. A high-quality image can be formed by controlling nozzles ejecting an ink droplet landing at a position where the pitch of adjacent landing droplets is larger than a predetermined pitch such that the area of a landing droplet formed by the nozzles is larger, thereby reducing the gap between landing droplet trains by the landing droplet train for ink droplets corresponding to print data.

Abstract: 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.

Abstract: 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.

Abstract: In an ink-jet printer, as a liquid-droplet jetting apparatus, when a predetermined condition is satisfied during an printing operation, a non-jetting drive pulse is applied to an actuator to impart vibration to an ink meniscus of an ink in the vicinity of nozzles without jetting the ink from the nozzles, while a carriage is moving along a width direction of a recording paper. This makes it possible to prevent the drying of the ink in the nozzles without performing flushing operation frequently. Accordingly, the occurrence of printing failure can be lowered and the printing time can be shortened.

Abstract: A liquid ejecting apparatus includes a liquid ejecting head with a pressure chamber communicating with a nozzle opening and a pressure generator capable of causing a pressure fluctuation to liquid in the pressure chamber. The liquid ejecting head discharges liquid droplets by operating the pressure generator. The drive signal generator generates a drive signal including a drive pulse which includes a first expanding element that expands the pressure chamber, a first discharging element that contracts the pressure chamber expanded by the first expanding element in order to discharge a liquid droplet, a second expanding element that expands the pressure chamber, and a second contracting element that contracts the pressure chamber. The time from the beginning of the first discharging element to the end of the second contracting element is set to ½ to 1 of the natural vibration period of the liquid in the pressure chamber.

Abstract: 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.

Abstract: A liquid ejection apparatus includes an element that is charged and discharged so as to perform an operation to eject a liquid, an analog signal generating unit that generates an analog signal having a voltage change pattern for determining the operation of the element, a charging transistor that amplifies a current of the analog signal while the element is charged, and pushes the amplified current toward the element, the charging transistor having a current source terminal, to which a current source is connected, and a push terminal for pushing the current, and a current source connector that selects at least one current source from among a plurality of current sources according to a voltage of the analog signal, and connects the selected current source to the current source terminal.

Abstract: 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.

Abstract: A method of modulating a peak power requirement of a modular printhead is provided. Each module of the printhead has respective segments of each of a plurality of rows of inkjet nozzles so that each nozzle row is comprised in a respective color channel. In the method each of the modules fires a respective segment within a predetermined segment-time such that at least one of the fired segments is contained in a different color channel from at least one of the other fired segments.

Abstract: 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.

Abstract: The liquid ejection head comprises: a nozzle from which liquid is ejected; a pressure chamber which accommodates the liquid to be ejected from the nozzle; a pressurizing device which deforms to pressurize the liquid in the pressure chamber to eject the liquid from the nozzle; and a nozzle flow channel through which the pressurized liquid flows from the pressure chamber to the nozzle, the nozzle flow channel having at least a portion in which forces acting toward an axis of the nozzle flow channel onto the liquid flowing inside the nozzle flow channel are not uniform within a cross-section perpendicular to the axis.

Abstract: 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.

Abstract: 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.

Abstract: A nozzle assembly for an inkjet printhead is disclosed. The nozzle assembly includes an inkjet nozzle having an actuator for ejecting an ink droplet from the inkjet nozzle when a resistive element of the actuator is heated by an electrical current, a shift register comprising a plurality of successive registers, the shift register receives input data in a first register, and shifts the input data to successive registers upon receipt of a shift signal, a transfer register for latching data in one of the registers of the shift register; a control gate for outputting a control pulse in response to data in the transfer register, and a drive transistor for providing an energy pulse to the resistive element of the actuator upon receipt of the control pulse. The nozzle is spaced from other nozzles ejecting ink of a same color by less than 32 microns in a direction transverse to the direction of movement of a print media upon which ink is ejected.

Abstract: 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.

Abstract: Provided is an ink-jet head and an ink-jet type recording apparatus for improving an impact position accuracy of ink droplets by eliminating a discharge speed difference of ink droplets when an ink volume is changed gradually in a plurality of steps to perform gradation expression. Among discharge pulse signals to be applied a plurality of times for gradually changing and discharging the ink droplet volume, a signal waveform of a final drive pulse and a signal waveform of an initial drive pulse to be operated at least once before the final drive pulse, are varied from each other so as to establish a predetermined relation therebetween.

Abstract: An imaging apparatus is provided that includes a liquid discharge head configured to discharge recording liquid as one or more recording liquid droplets; a drive waveform generating unit configured to generate a drive waveform including at least two drive signals within one printing period; a drive unit configured to input tone data, select a relevant drive signal from the drive waveform via a switch that switches on/off according to the tone data, and apply the selected drive signal to the liquid discharge head; and a transmitting unit configured to transmit the tone data to the drive unit plural times within one printing period, the tone data being configured at a plurality of bits per channel.

Abstract: 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.

Abstract: 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.

Abstract: A droplet ejecting component of the present invention includes an ejecting component having a charge and discharge characteristic, an applying component being provided with a transistor, and an increasing component. The ejecting component ejects a droplet. When a control signal is inputted, the applying component applies an application voltage to the ejecting component, and the increasing component increases the impedance of the transistor.

Abstract: The inkjet recording apparatus includes: an inkjet recording head which includes a nozzle through which liquid is ejected; a pressure regulating unit which includes a liquid chamber that communicates with the nozzle and a gas chamber that is partitioned from the liquid chamber by a flexible film; and a liquid chamber pressure controlling device which controls a pressure of the liquid chamber to a predetermined negative pressure when carrying out back pressure control in which back pressure is applied to the liquid inside the nozzle, wherein: the flexible film causes change in the pressure of the liquid chamber when the liquid is supplied for at least a predetermined supply amount to the liquid chamber in a state where the gas chamber is open to air; and the liquid chamber pressure controlling device carries out the back pressure control after controlling the pressure of the liquid chamber to a predetermined value of positive pressure by supplying the liquid of at least the predetermined supply amount to the l

Abstract: A droplet ejecting component of the present invention includes an ejecting component having a charge and discharge characteristic, an applying component being provided with a transistor, and an increasing component. The ejecting component ejects a droplet. When a control signal is inputted, the applying component applies an application voltage to the ejecting component, and the increasing component increases the impedance of the transistor.

Abstract: 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.

Abstract: The invention provides for an inkjet printhead having a plurality of micro-electromechanical vapor bubble generators. Each bubble generator includes a nozzle in fluid communication with an ink chamber, and a heater positioned in thermal contact with ink in the chamber. Each generator also includes drive circuitry configured to provide a modulated pulse to the heater to generate a vapor bubble in the ink in said chamber, the pulse comprising a pre-heat series of a predetermined number of pulses separated by a predetermined period, followed by a trigger pulse of a period twice that of said predetermined period.