Abstract: A liquid discharge device includes a liquid discharge head including a plurality of liquid chambers respectively communicating with a plurality of nozzles and circulating liquid therethrough. Each liquid chamber is provided with a pressure generator for discharging the liquid from a corresponding nozzle. The liquid discharge device further includes a waveform data memory to store drive waveform data including discharge drive waveform data for discharging the liquid according to image data and micro-vibration drive waveform data for causing a micro vibration of a meniscus of the liquid discharge head. The liquid discharge device further includes circuitry configured to generate a drive waveform based on the drive waveform data; apply, to the pressure generator, a discharge drive waveform based on the discharge drive waveform data, in a printing area; and apply, to the pressure generator, a micro-vibration drive waveform based on the micro-vibration drive waveform data, in a non-print area.

Abstract: A printing system and method for forming an ink droplet through the use of a multi-pulse driving signal to increase the printing frequency without reducing the droplet size by applying a multi-pulse driving signal to a small nozzle and to increase the inkjet printing speed by using a smaller nozzle to produce the same-size droplet using a multi-pulse driving signal, which allow for higher printing frequency due to the smaller nozzle size as dictated by the fundamental droplet formation dynamics.

Abstract: An element substrate provided in a printhead includes a heater configured to heat ink and discharge the ink from a nozzle, a temperature sensor provided in correspondence with the heater, an electric current source configured to energize the temperature sensor with an electric current based on an electric current value specified by an externally input first signal, and a determination circuit configured to determine an ink discharge status of the nozzle based on a voltage output from the temperature sensor energized with the electric current and a threshold voltage specified by an externally input second signal, and output a determination result signal.

Abstract: A liquid discharge apparatus that includes a liquid discharge head including a nozzle discharging liquid onto a recording medium and a pressure generating unit generating pressure by a change in a drive waveform of the liquid, a drive waveform generating unit generating the drive waveform applied to the pressure generating unit, and a waveform selection unit selectively masking a part of the drive waveform and selecting a pulse of the drive waveform, wherein the drive waveform includes at least one discharge pulse and a micro-drive pulse for causing a change in meniscus so that the liquid is not discharged at a point where the liquid is not discharged on the recording medium, wherein the micro-drive pulse is disposed at a head of a discharge cycle of the drive waveform, and wherein the micro-drive pulse is disposed at an integer multiple of a natural vibration cycle Tc of the liquid chamber.

Abstract: A liquid discharge head according to the present disclosure includes a plurality of discharge holes, a plurality of pressure applying chambers, a flow path member including a plurality of common flow paths, and a plurality of pressure applying modules. Adjacent discharge hole groups have a part in which, when a discharge hole A is positioned in an n column in one of the discharge hole groups, a discharge hole B in the discharge hole group located adjacent with the common flow path interposed therebetween is positioned in an n±1 column. A discharge hole C in the discharge hole group located at a center in a second direction is positioned in an n column, while a non-carry discharge hole is positioned in an n±1 column.

Abstract: A liquid ejecting apparatus is provided with pressure generating units for pressure chambers one of which is provided for each of a plurality of nozzles and drives the pressure generating units corresponding to liquid ejection requests which request liquid ejection from the nozzles while achieving supplying of a liquid to the pressure chambers and collection of the liquid which has passed through the pressure chambers. Accordingly, the liquid is ejected from the nozzles. Meanwhile, an occurrence of a fault in the liquid ejection is determined using a vibration transition of a residual vibration which occurs in the liquid of the pressure chambers according to a pressure change accompanying driving of the pressure generating units, and driving of the pressure generating unit of an ejection fault pressure chamber in which it is determined that a fault occurs in the liquid ejection is stopped spanning at least a fixed stopping period.

Abstract: A system and method for programmably operating a DC load connected to a DC outlet. A power line communication (PLC) client at the outlet measures actual and desired DC voltage at the load. A remotely located DC power server is connected between a DC power source and the outlet. The power server has a PLC master in bidirectional feedback communication with the PLC client to determine the actual and desired DC voltage at the load. An adjustable DC voltage module at the power server is controlled by the PLC master to supply an adjustable DC voltage. The power server adjusts the DC voltage supplied by the voltage module to the load based on the bidirectional feedback communication between the PLC master and the PLC client.

Abstract: There is provided a driving circuit that drives a piezoelectric element, the driving circuit including an integrated circuit, in which the integrated circuit includes a first register that holds an operating state data, a second register that holds an abnormality detection data, an abnormality detection circuit that determines the presence or absence of an abnormality of the operating state data based on the abnormality detection data, and an output control circuit that controls supply of a first voltage signal to the piezoelectric element and supply of a power source voltage to the switch circuit, and in which the output control circuit delays stop of the supply of the power source voltage to the switch circuit with respect to stop of the supply of the first voltage signal to the piezoelectric element when the abnormality detection circuit determines that the operating state data is abnormal.

Abstract: There is provided a driving circuit including: an integrated circuit, in which the integrated circuit includes an amplification control signal generation circuit that generates an amplification control signal, a first register that holds an operating state data indicating an operating state of the driving circuit, a second register that holds an abnormality detection data for determining the presence or absence of an abnormality in the operating state data, an abnormality detection circuit that determines whether or not the operating state data is abnormal based on the abnormality detection data, and generates an abnormality detection signal indicating the determination result; and an abnormality detection signal output control circuit that controls whether or not the abnormality detection signal is output, in which the abnormality detection signal output control circuit does not output the abnormality detection signal in a first mode to be shifted after power is turned on.

Abstract: A liquid ejecting head including a head unit including a mounting surface on which a plurality of first terminals, to which a signal to eject ink from a nozzle is supplied, are formed, and a flexible wiring substrate including a plurality of second terminals that supply the signal to the head unit, the flexible wiring substrate bonded to the head unit with nonconductive paste while the second terminals and the first terminals are in an electrically coupled state, in which the plurality of second terminals are arranged at pitches of 50 ?m or less, and in which protrusions in contact with surfaces of the first terminals are formed on surfaces of the second terminals, the protrusions protruding at a height exceeding a surface roughness of the second terminals.

Abstract: A liquid discharging apparatus has: a first driving signal creation circuit that has a first transistor and a first integrated circuit; a second driving signal creation circuit that has a second transistor and a second integrated circuit; a third driving signal creation circuit that has a third transistor and a third integrated circuit; and a circuit board having a first side, a second side opposite to the first side, a third side, and a fourth side opposite to the third side. The first integrated circuit and first transistor are positioned on the circuit board side by side in a direction away from the first side and toward the second side. The third integrated circuit and third transistor are positioned on the circuit board side by side in a direction away from the third side and toward the fourth side.

Abstract: There is a provided a drive circuit in which a first drive signal output circuit includes a first control circuit that controls an output of a first drive signal, and a first abnormality detection circuit that detects an abnormality in a first drive signal output circuit, a second drive signal output circuit includes a second control circuit that controls an output of a second drive signal, and a second abnormality detection circuit that detects an abnormality in a second drive signal output circuit, the first drive signal output circuit transmits an occurrence of abnormality to the second drive signal output circuit, when the first abnormality detection circuit detects the abnormality, and the second drive signal output circuit transmits an occurrence of abnormality to the first drive signal output circuit, when the second abnormality detection circuit detects the abnormality.

Abstract: In a droplet discharge head, in an initial state in which a tip of the actuator has contact with the vibrating plate, and the actuator pushes the vibrating plate toward the first direction, based on a drive signal from the control section, the tip of the actuator displaces the vibrating plate toward the second direction in a state of having contact with the vibrating plate to thereby pull in a meniscus in the nozzle toward the liquid chamber, then, the tip of the actuator is separated from the vibrating plate to further displace the vibrating plate toward the second direction, and then, the tip of the actuator collides with the vibrating plate to thereby displace the vibrating plate toward the first direction to discharge the liquid from the nozzle.

Abstract: An example printer includes an actuator selection engine. The actuator selection engine is to determine, for an array including a plurality of fluidic actuators, which fluidic actuators to fire. The printer also includes a balancing engine. The balancing engine is to analyze the determined fluidic actuators to identify a large set of fluidic actuators scheduled to fire substantially simultaneously. The balancing engine is also to schedule the large set of fluidic actuators among a plurality of fire pulse groups. Each fire pulse group may include a subset of the large set of fluidic actuators to be fired at a time distinct from another subset.

Abstract: Techniques are presented for digital ink jet printing upon a substrate with a significant third dimension. Droplets in the range of 120 pL to 200 pL have been found suitable for substrates with variability, in the third dimension, of up to approximately 4 cm. A larger droplet can be generated by utilizing a plurality of drive pulses, each of which generates a smaller droplet, and having the plurality of smaller droplets combine in mid-air. The data to be printed can be derived from a 3D model and such 3D model can also be used to guide shaping of the substrate. The 3D model can be produced from 2D image data. If the 2D image data is a two-dimensional portrait photograph, a result, of using the present invention, can be a realistic portrait in the form of a bas-relief sculpture.

Abstract: A printing system includes a controller and a thermal printing head including multiple driving elements and an integrated transmission control interface. The thermal printing head is coupled to the controller. The driving elements are configured to print. The integrated transmission control interface coupled to the controller and driving elements is configured to receive from the controller at least one of a compensation data, a printing data, a clock signal, a data signal, a latch signal or a start-heating signal, and send to driving elements the at least one of the compensation data, the printing data, the clock signal, the data signal, the latch signal or the start-heating signal.

Abstract: An image processing device configured to: determine whether a specific condition indicating ink supplied from an ink supplier to a printing head may be delayed; generate dot data by using image data, including: generating first dot data when the specific condition is not satisfied; and generating second dot data when the specific condition is satisfied, a ratio of first/second type of dots included in an image based on specific second dot data generated using specific image data being greater/smaller than that included in an image based on specific first dot data generated using the specific image data, and total number of dots included in the image based on the specific second dot data being larger that included in the image based on the specific first dot data; and output printing data based on the dot data.

Abstract: Ink stabilizing material is applied to rotatable panels within a cap of an inkjet cartridge resting structure. The rotatable panels then rotate to contact an inkjet printhead when the printhead contacts the cap. Continuous periodic flushing of the printhead is performed while the rotatable panels are contacting the printhead by periodically and repeatedly alternating between ejecting a mixture of the ink stabilizing material and ink from the nozzles, and drawing the mixture of the ink stabilizing material and the ink back into the nozzles.

Abstract: There is provided a droplet deposition apparatus comprising: control circuitry configured to generate a common drive waveform; storage to store data, wherein the storage comprises a buffer to store scheduled image data relating to one or more pixels; a droplet deposition head having one or more actuator elements configured to be driven in response to drive pulses derived from the common drive waveform; and wherein the common drive waveform comprises a plurality of pixel periods comprising a firing phase and a non-firing phase, each firing phase comprising a firing pulse and each non-firing phase comprising a non-firing pulse, wherein the characteristics of each non-firing pulse are defined in response to the data in storage, and wherein, the firing pulse of a first pixel period is applied as a drive pulse to an actuator element based on the scheduled image data relating to a first pixel, and wherein the non-firing pulse of the first pixel period is applied as a drive pulse to the actuator element based on pas

Abstract: Provided is a print head including: multiple discharging sections, each of which discharges liquid based on a drive signal; and a data management section that includes a first data retention section and manages first control data that controls a state of each of the multiple discharging sections, and inspection target discharging-section designation data that designates the discharging section which is to be inspected, which is among the multiple discharging sections; and a drive waveform selection section that selects a waveform of the drive signal for each of the multiple discharging sections, in which the data management section has a first transfer mode in which the first control data is parallelly transferred to the first data retention section, and a second transfer mode in which the first data retention section is caused to operate as a shift register that serially transfers the inspection target discharging-section designation data.

Abstract: A liquid discharge apparatus includes a liquid discharge head and processing circuitry. The liquid discharge head is configured to discharge, to a foamable medium, liquid having a function of suppressing foaming of the medium to form irregularities. The processing circuitry is configured to hold condition information indicating a content defined by each of a plurality of conditions related to image formation at a time when the liquid forms a predetermined pattern image on the medium; and generate and output, for each condition of the plurality of conditions, an evaluation medium on which irregularities corresponding to the predetermined pattern image formed according to the condition are formed.

Abstract: According to one embodiment, an inkjet head includes a pressure chamber connected to a nozzle, an actuator corresponding to the pressure chamber and configured to change a volume of the pressure chamber, and a drive circuit configured to drive the actuator causing two or more ink droplets to be consecutively discharged from the nozzle. The drive circuit applies in sequence a first drive waveform for expanding the pressure chamber, a second drive waveform having a first pulse width, a third drive waveform for releasing the pressure chamber from an expanded state, a fourth drive waveform having a second pulse width, and a fifth drive waveform for contracting the pressure chamber.

Abstract: An image recording apparatus includes a carriage which reciprocatingly moves in a scanning direction, a head mounted on the carriage to jet liquid, a speed sensor which acquires speed data related to speed of the carriage, and a controller configured to: record an image by executing a recording pass in which the liquid is jetted from the head toward a recording medium while moving the carriage once toward one side in the scanning direction; determine whether the speed indicated by the speed data is lower than a threshold value during the recording pass; and based on determination that the speed indicated by the speed data is lower than the threshold value at a first point of time in the recording pass, determine whether to suspend or continue the recording pass by referring to the speed data acquired after a predetermined time since the first point of time.

Abstract: A liquid ejection head includes a manifold configured to store liquid therein, a plurality of ejection channels, and a dummy channel. Each ejection channel communicates with the manifold and is configured to receive liquid from the manifold and eject liquid through a corresponding nozzle thereof open to a nozzle surface. The dummy channel communicates with the manifold and includes a dummy nozzle open to the nozzle surface. The dummy channel further includes a pressure chamber, an actuator configured to apply pressure to liquid in the pressure chamber, a communication passage connecting the manifold to the pressure chamber, and a circulation passage through which the pressure chamber communicates with the manifold. The circulation passage is different from the communication passage and located between the dummy nozzle and the manifold.

Abstract: A first flow path member of a liquid ejection head includes a plurality of pressurizing chambers respectively connected to a plurality of ejection holes, a plurality of first individual flow paths and a plurality of second individual flow paths which are respectively connected to the plurality of pressurizing chambers, and a first common flow path connected in common to the plurality of first individual flow paths and the plurality of second individual flow paths. The pressurizing chamber, the first individual flow path, the first common flow path, and the second individual flow path configure an annular flow path. When T0 denotes a resonance period of the pressurizing chamber and T1 denotes a time required for a pressure wave to circulate once around the annular flow path, a decimal place value of T1/T0 is ? to ?.

Abstract: A circuit or a droplet deposition apparatus, the circuit configured to generate a drive waveform having a drive pulse, a first non-ejection pulse and a second non-ejection pulse, and wherein the first non-ejection pulse is inverted with respect to the second non-ejection pulse.

Abstract: There is provided an image recording apparatus including a carriage, a head, a velocity sensor, and a controller. The controller obtains velocity data of the carriage from the velocity sensor, determines a threshold value based on the velocity data, records an image on a recording medium, and suspends a recording pass when the controller has determined that a velocity indicated by the velocity data is lower than a velocity corresponding to the threshold value. The controller can execute a first recording mode and a second recording mode in which the velocity of the carriage is faster than that of the first recording mode. The velocity data for the first recording mode is obtained in a warm-up time after a recording command is received until recording of the image is started. The velocity data for the second recording mode is obtained in other time other than the warm-up time.

Abstract: A liquid ejecting apparatus includes an ejection unit that ejects a liquid by a piezoelectric element being driven, a drive signal generation unit that generates a drive signal for driving the piezoelectric element, a residual vibration detection unit that detects a residual vibration of the ejection unit after the drive signal is applied to the piezoelectric element, and an inspection control signal generation unit that generates an inspection control signal for instructing start of detection of the residual vibration by the residual vibration detection unit. The inspection control signal when a temperature of the ejection unit is a first temperature differs from the inspection control signal when the temperature of the ejection unit is a second temperature lower than the first temperature.

Abstract: Disclosed is a liquid ejecting head including a flow passage forming section in which a pressure chamber which communicates with a nozzle ejecting liquid and a circulation liquid chamber which communicates with the pressure chamber to circulate the liquid are formed, a driving element that generates pressure change in the pressure chamber, a circuit board for driving the driving element, and a connecting terminal that electrically connects the driving element with the circuit board, in which the connecting terminal overlaps the circulation liquid chamber in a plan view.

Abstract: A method of operating an inkjet printer that forms textual data with non-absorbing media ink on non-absorbing media forms the characters with structure that improves the integrity of the edges of the characters over previously known systems. The method includes modifying character pixels in image data used to generate firing signals for operating inkjets in a print head of an inkjet imaging device, generating firing signals for operating the inkjets from the modified character pixels, and operating the inkjets in the print head with the generated firing signals to eject drops of non-absorbing media ink onto non-absorbing media to form characters on the non-absorbing media. The character pixel modification reduces a number of character pixels in a connecting zone of a character that have a value that corresponds to a firing signal that activates an inkjet.

Abstract: Disclosed is a method of providing adjustment data for a droplet deposition head (such as a printhead), or a data processing component therefor. The method makes use of test data, which has been collected by operating the droplet deposition head (or a test droplet deposition head of substantially the same construction, e.g from the same batch), using a set of test waveforms, at a number of frequencies within a test range, and by recording the volume and velocity of the thus-ejected droplets, with these recorded values (volr, velr) being represented within the test data. Each of the set of test waveforms includes a basic drive waveform and a number of adjusted drive waveforms, each of which corresponds to the basic drive waveform, but with a particular waveform parameter adjusted by a corresponding amount. This waveform parameter is a continuous variable, such as pulse width or pulse amplitude.

Abstract: In accordance with an embodiment, a liquid discharge head comprises an actuator and a controller. The actuator drives a pressure chamber, which is filled with liquid and communicates with a nozzle in which a meniscus of the liquid is formed. The controller applies an acceleration pulse for accelerating vibration of the meniscus to the actuator after applying a discharge pulse for discharging the liquid in the pressure chamber from the nozzle.

Abstract: Exemplary printing apparatuses include, among other components, a printhead structure that includes nozzles adapted to eject liquid ink, a carriage assembly having positioning structures, and one or more printhead caps or cups within the carriage assembly. The carriage assembly is shaped to latch to the printhead structure. The printhead includes corresponding structures and the positioning structures engage with the corresponding structures when the carriage assembly is latched to the printhead structure. Also, the printhead caps are positioned within the carriage assembly so as to cover the nozzles when the carriage assembly is connected to the printhead structure.

Abstract: A liquid ejecting apparatus includes a nozzle for ejecting liquid, a pressure chamber communicating with the nozzle, a first individual flow path communicating with the pressure chamber, a second individual flow path communicating with the pressure chamber, a pressure generating unit changing a pressure of the liquid in the pressure chamber, and a control unit for driving the pressure generating unit. In the liquid ejecting apparatus, the liquid is supplied into the pressure chamber via one of the first individual flow path and the second individual flow path, and at least a part of the liquid supplied into the pressure chamber is discharged via the other. The control unit introduces air into the pressure chamber via the nozzle by driving the pressure generating unit, during a period in which the liquid is not ejected from the nozzle.

Abstract: A driving system includes a voltage conversion module, a switching module, a detecting module, a voltage dividing module and a microcontroller. The voltage conversion module converts a first DC voltage into a second DC voltage. The switching module converts the second DC voltage into an AC voltage so as to drive a piezoelectric actuator of a piezoelectric pump. The detecting module includes a feedback circuit and a gas pressure sensor, wherein the feedback circuit detects an electric power reference value of the switching module, and the gas pressure sensor detects the gas pressure value of the piezoelectric pump. The microcontroller acquires a working frequency according to the electric power reference value so as to operate the piezoelectric actuator at the working frequency. The microcontroller controls the voltage conversion module to adjust the output voltage. Consequently, a gas pressure in the piezoelectric pump is correspondingly adjusted.

Abstract: A head voltage correcting method for inkjet printing apparatus which perform printing with a head having a plurality of head modules includes the following steps: a testing chart printing step for printing testing charts which includes a lowest density head module check pattern, satellite check patterns, band-by-band density variable patterns, and in-band density variable patterns; a lowest density head module determining step for determining a lowest density head module; a satellite-free drive voltage determining step; and a new reference voltage determining step for determining a drive voltage of the band-by-band density variable patterns of the adjacent head module to be a new reference voltage for the adjacent head module.

Abstract: An inkjet recording apparatus has a head, a first board, and a second board. The head has a plurality of nozzles and a plurality of driving elements. The first board includes a control circuit and a sensing circuit unit. The second board includes a driving voltage generator and a driver circuit. The driver circuit makes ink ejected. The driving voltage generator and the driver circuit are connected together via a first power supply line. The sensing circuit unit is connected to the first power supply line and outputs a first sensing signal. Based on the first sensing signal, the control circuit senses an abnormality in power supply on the second board.

Abstract: A liquid discharge apparatus includes: a signal line supplied with a print data signal including first data and second data; a discharge head including a plurality of nozzles including a first nozzle and a second nozzle that discharge liquid in accordance with the print data signal; a first register that is connected to the signal line, captures the first data corresponding to the first nozzle, and holds the first data; a second register that is connected to the signal line, captures the second data corresponding to the second nozzle, and holds the second data; and a register selection circuit that exclusively selects either capturing the first data by the first register or capturing the second data by the second register based on register selection data.

Abstract: A liquid discharge device includes a liquid discharge head to discharge liquid and circuitry configured to generate a drive waveform to drive the liquid discharge head. The circuitry converts, to an analog signal, drive waveform voltage data being a source of the drive waveform; amplifies in voltage the analog signal to generate a drive waveform voltage signal; amplifies in current the drive waveform voltage signal to generate the drive waveform; monitors the drive waveform to detect an abnormality of the drive waveform; controls an operation of the liquid discharge device based on a result of detection of the abnormality of the drive waveform; compares an output of the voltage amplifier and an output of the current amplifier to output a difference between the output of the voltage amplifier and the output of the current amplifier; and outputs a binarized signal based on the difference.

Abstract: A print head includes a drive module having 600 or more piezoelectric elements aligned at a density of 300 or more per inch for ejecting liquid, and a sensor substrate on which a temperature sensor is mounted and which is attached to the drive module, in which the sensor substrate is formed by laminating a conductive metal for transmitting an output signal of the temperature sensor and a liquid crystal polymer which is a nonconductive resin.

Abstract: A method for detecting defective printing nozzles in an inkjet printing machine includes printing a multi-row printing nozzle test chart formed of horizontal rows of equidistant vertical lines periodically underneath one another, with only printing nozzles in a print head contributing to every row of the test chart corresponding to the horizontal rows. An area coverage element geometrically associated with the test chart is printed, both elements are recorded by an image sensor and analyzed by the computer. The computer analyzes the recorded area coverage element to detect print defects and allocates defects to a region of geometrically close printing nozzles. An analysis of the test chart in the region identifies nozzles causing the defect. Defective printing nozzles are detected based on thresholds, the detected printing nozzles are then compensated, and in the analysis of the recorded area coverage element, influences of the sensor are eliminated by shading correction.

Abstract: Reduction of the size of the droplet in 1-drop ejection is easily performed. A liquid jet head according to an example of the disclosure includes a nozzle adapted to jet a liquid, a piezoelectric actuator having a pressure chamber communicated with the nozzle and filled with the liquid, and adapted to vary a capacity of the pressure chamber, and a control section adapted to apply a pulse signal to the piezoelectric actuator to thereby expand and contract the capacity of the pressure chamber so as to jet the liquid filling the pressure chamber. The control section applies the pulse signal adapted to expand the capacity in the pressure chamber when jetting 1 drop of the liquid so as to include a first pulse signal having a pulse width one of equal to or shorter than an on-pulse peak, and a second pulse signal disposed with a predetermined time interval from the first pulse signal.

Abstract: There is provided a liquid discharge device including: a printing head; and a head driving circuit that is connected to the printing head via an FFC and outputs a driving signal, in which the driving circuit includes a signal output unit which outputs an analog signal, a transistor pair which is connected to the signal output unit and the FFC and driven with the analog signal output from the signal output unit to output the driving signal to the FFC, a return path which is connected to the FFC and feeds back the driving signal output from the transistor pair to the signal output unit, and an oscillation suppression unit which suppresses oscillation of input from the return path to the signal output unit.

Abstract: A semiconductor device used for a liquid discharge head includes first heaters configured to apply energy to a liquid, second heaters whose resistance values are to be measured, switch elements, and first and second lines. Each of the second heaters is connected in series with a corresponding one of the switch elements between the first line and the second line. The second heaters have shapes different in at least one of length or width. A connection destination of at least one of two terminals of each of the first heaters is different from connection destinations of two terminals of each of the second heaters.

Abstract: A liquid ejection head includes an element substrate for ejecting a liquid, an integrated circuit board outputting a control signal for controlling the element substrate, and an electrical wiring board connected electrically to the element substrate. The electrical wiring board has a signal line connector to which control signals are inputted and electrical wiring board connectors to which an electric signal for driving the liquid ejection head is inputted. The signal line connector and the electrical wiring board connectors are disposed on opposite sides to each other relative to a center line extending orthogonally to a longitudinal direction of the electrical wiring board.

Abstract: First electronics may determine a count of bubble jet resistors to be fired by a fire pulse group. A fire pulse generator may generate a fire pulse train for bubble jet resistors, the fire pulse train comprising a precursor pulse and a firing pulse separated by a dead time. Second electronics may adjust a width of the fire pulse for the bubble jet resistors of the fire pulse group by maintaining a first edge of the fire pulse relative to the precursor pulse and adjusting a second edge of the fire pulse relative to the precursor pulse based upon the determined count for the fire pulse group.

Abstract: An inkjet recording apparatus and an inkjet recording method which enable changing a droplet amount without changing a droplet speed of an ink discharged from the same nozzle, and including an inkjet head which expands and contracts a capacity of a pressure chamber by applying a driving signal to an actuator and a driving circuit which applies the driving signal to the actuator, the driving signal including a first expansion pulse which starts from a reference potential and expands the capacity of the pressure chamber, a first contraction pulse which contracts the capacity of the pressure chamber to discharge the ink from the nozzle, a second expansion pulse which expands the capacity of the pressure chamber, and a second contraction pulse which contracts the capacity of the pressure chamber and returns to the reference potential in the mentioned order, the driving circuit being configured to enable discharging different droplet amounts of the ink from the same nozzle by changing a potential difference betwee

Abstract: A printhead circuit for providing pulses for driving two or more actuating elements, the circuit comprising a cold switch drive circuit, for driving an actuating element for a first phase of a first pulse, the cold switch drive circuit having a cold drive switch for selectively coupling a drive waveform to the actuating element during the first phase according to a print signal; and a hot switch drive circuit, for driving the actuating element for a second phase of the first pulse, wherein the hot switch drive circuit is configured to drive the actuating element during the second phase according to an actuating element compensation indication signal.

Abstract: A fluid ejection device includes a fluid slot, a fluid ejection chamber communicated with the fluid slot, a drop ejecting element within the fluid ejection chamber, a fluid circulation channel communicated at one end with the fluid slot and communicated at another end with the fluid ejection chamber, a fluid circulating element within the fluid circulation channel, and a channel wall separating the fluid ejection chamber and the fluid circulation channel. The fluid circulation channel includes a channel loop, and a width of the channel wall is based on a width of the channel loop and a width of the fluid ejection chamber.

Abstract: According to one embodiment, a waveform generating device includes a head driver configured to apply a driving signal to an actuator to discharge ink from a pressure chamber connected to a nozzle, the driving signal including a first portion for reducing an ink pressure in the pressure chamber and a second portion for increasing the ink pressure in the pressure chamber. The second portion is increased in potential by a first potential increase when ink pressure in the pressure chamber is at a maxima and the second portion is further increased in potential by a second potential increase when the ink pressure of the pressure chamber is at a negative value after the first potential increase.