Abstract: A method of forming an electrical connection for a fluid ejection device including a fluid channel communicating with a first side and a second side of the fluid ejection device and an array of drop ejecting elements formed on the first side of the fluid ejection device includes forming a trench in the second side of the fluid ejection device, depositing a conductive material in the trench, forming a first opening in the fluid ejection device between the first side of the fluid ejection device and the conductive material in the trench, depositing a conductive material in the first opening, and forming a conductive path between the conductive material in the first opening and a wiring line of one of the drop ejecting elements.

Abstract: To provide a driving method of an ink jet recording head and an ink jet recording apparatus capable of maintaining a satellite at the time of ejecting a big droplet always in a good flying condition without regard to a change in environment temperature, and also speeding up refill operation after ejecting the big droplet.

Abstract: A head is provided with a driving signal line having a driving terminal for receiving a driving signal sent from an apparatus to the head, and an identification terminal. The driving signal line is electrically connected to the identification terminal. With the use of the driving signal line and the identification terminal, the head is identified.

Abstract: An inkjet printhead assembly includes at least one inkjet printhead including N primitives and an address having M possible address values. Each primitive includes a group of at most M drop generators. The address is cycled through all M address values to control a sequence of which one drop generator in the primitive is fired at a given time. One drop generator in the primitive can be fired simultaneously with one drop generator in each of the other primitives. A primitive to address ratio (N/M) of the printhead is at least 10 to 1.

Abstract: A dynamic memory based integrated circuit ink jet firing cell that includes a heater resistor, a drive transistor, and a dynamic memory circuit for storing firing data only for such heater resistor. Also disclosed is an integrated circuit firing array that includes a plurality of dynamic memory based firing cells divided into a plurality of fire groups of firing cells, each fire group having a plurality of subgroups; data lines for providing energizing data to the firing cells; control lines for providing control information to the firing cells wherein all firing cells within a subgroup are connected to a common subset of the control lines so as to be controlled to concurrently store energizing data; and a plurality fire lines for supplying energizing energy to the firing cells, wherein all firing cells of a fire group receive energizing energy from only one fire line.

Abstract: A dynamic memory based integrated circuit ink jet firing cell that includes a heater resistor, a drive transistor, and a dynamic memory circuit for storing firing data only for such heater resistor. Also disclosed is an integrated circuit firing array that includes a plurality of dynamic memory based firing cells divided into a plurality of fire groups of firing cells, each fire group having a plurality of subgroups; data lines for providing energizing data to the firing cells; control lines for providing control information to the firing cells wherein all firing cells within a subgroup are connected to a common subset of the control lines so as to be controlled to concurrently store energizing data; and a plurality fire lines for supplying energizing energy to the firing cells, wherein all firing cells of a fire group receive energizing energy from only one fire line.

Abstract: A recording head is provided with a pressure chamber communicated with a nozzle orifice. A pressure generating element generates pressure fluctuation in ink contained in the pressure chamber. A drive signal generator generates a drive signal for driving the pressure generating element such that a main ink droplet and a satellite ink droplet accompanied with the main ink droplet are ejected to form an ink dot on a recording medium. The main ink droplet has a first volume, and the satellite ink droplet has a second volume which is larger than the first volume. Alternatively, the main ink droplet is ejected with a first speed, and the satellite ink droplet is ejected a second speed which is faster than the first speed.

Abstract: A recording head provided with a plurality of nozzles, a plurality of pressure chambers, each communicated with one nozzle, and a plurality of pressure generating elements, each associated with one pressure chamber and actuated to eject ink from one associated nozzle. An ejection controller specifies a nozzle from which an ink droplet having the least weight is ejected as a reference nozzle. A driving signal generator generates a driving signal applied to the respective pressure generating elements. The drive signal has a driving voltage determined such that an ink droplet ejected from the reference nozzle has a predetermined flight velocity or more.

Abstract: A printhead having a high electrostatic tolerance, in particular, having an improved tolerance to an electric insulation breakdown in an interlayer film that is a characteristic electrostatic breakdown in a printhead, is provided without increasing the cost of a printing apparatus main unit or the printhead and the size of the printhead. Also provided is a printing apparatus employing said printhead. A protection circuit for protecting the printing element is formed between a signal input pad of the printing element and an inverter. The first protection function comprising two diodes, which is included in the protection circuit, enables quick dissipation of a high-voltage electrostatic surge, applied to the input pad, to a power supply or base line having a large capacity.

Abstract: Thermal ink jet defect tolerant resistor designs are described. In one embodiment, a thermal ink jet resistor structure comprises a first resistor element and at least one other resistor element. The resistor elements are connected in parallel and have substantially the same resistances. The resistor elements are configured for redundancy such that if one of the resistor elements fails, one or more remaining resistor elements can function to effectuate ink ejection. In another embodiment, a thermal ink jet printer comprises multiple ink reservoirs configured for holding and ejecting ink toward a print medium. At least one resistor array is disposed within each ink reservoir. Each resistor array comprises multiple, redundant resistor elements that are connected in parallel with one another such that failure of any one resistor element will not render its associated ink reservoir inoperative.

Abstract: An ink jet printing apparatus which performs printing by using a print head. The print head has at least a predetermined number of nozzles to eject ink. The apparatus includes first prefiring means for causing the print head to perform a prefiring operation to eject ink from nozzles of the print head for maintaining printing quality after a first time interval during a printing operation. The apparatus also includes driving means for driving nozzles of the print head based on data to be printed, and second prefiring means for causing the print head to perform the prefiring operation in a case where a number of the nozzles to be driven is changed. Preferably, the apparatus further includes shifting means for causing the driving means to drive the nozzles of the print head based on the first time interval during the printing operation so as to enhance a power of ejecting ink and continue the printing operation after the first time interval without performing the prefiring operation.

Abstract: A drop emitting device that includes a plurality of nozzle openings and a plurality of grooves in the vicinity of the nozzle openings.

Abstract: A digital encoder control method of a digital control apparatus has a driving unit, a frequency signal generating unit for generating a pulse signal of a frequency according to a driving velocity of a driven member which is driven by the driving unit, an edge detecting unit for detecting a rising-up edge and a falling-down edge of the pulse signal, and a period data detecting unit for counting period data between edges detected by the edge detecting unit. Each time the edges are detected by the edge detecting unit, the period data between the same edges as the detected edges is outputted as control velocity data of the driving unit.

Abstract: An ink jet head includes a head body (11) which is provided with a plurality of nozzles and a plurality of pressure chambers and actuators (14) respectively corresponding to the nozzles. Input terminals (37) of the actuators (14) are arranged locally between left-side and right-side central actuator columns (14A, 14A). A driver IC (13) is mounted on the head body (11) by flip chip bonding.

Abstract: A printhead mainly includes at least two ink supply holes on a single semiconductor substrate, a first signal processing circuit laid out at least at one corner of the semiconductor substrate to arbitrarily select a heater for heating the ink, and a second signal processing circuit, other than the first signal processing circuit for arbitrarily selecting a heater, that realizes a function without dividing an arrangement. The lengths of signal lines are minimized to realize a printhead free from any malfunction.

Abstract: An ink jet recording head and an ink jet recording apparatus which can be manufactured at low cost and with a continuous length by using nonlinear elements having MIM-type electrical characteristics to drive heat generating members having a bubble jet recording system so as to prevent the nonlinear elements from being destroyed by a heat generation of the nonlinear elements.

Abstract: Printhead substrate for inputting a data signal (DATA) in synchronization with a clock signal (CLK). The printhead substrate comprises: input terminals inputting the clock signal and data signal; shift registers inputting and maintaining the data signal in synchronization with the clock signal inputted from the input terminals; and a time lag adjuster arranged between an input terminal and the shift register to adjust a time lag of at least one of the clock signal or data signal. By virtue of adjusting the time lag by the time lag adjuster, setup time and hold time between the clock signal and the data signal inputted to the shift register is ensured.

Abstract: An ink jet printer uses an actuator and an oscillating pressured ink supply. A shutter is located between the ink supply and an ink ejection port, normally blocking the ink ejection port. An actuator is provided for moving the shutter mechanism on demand away from the ink ejection port so as to allow for the ejection of ink on demand from the ink ejection port. The actuator includes a thermal actuator in a coiled form constructed primarily from polytetrafluorethylene. The coil is uncoiled upon heating. The actuator includes a serpentine heater element encased in a material having a high coefficient of thermal expansion. The serpentine heater takes a concertina form upon heating and a thick return trace returns the actuator to its original position upon cooling.

Abstract: A printing apparatus and a printing control method. After an odd-numbered block designation signal to select an odd-numbered block among a plurality of blocks of the printhead is generated and outputted to the printhead, and an even-numbered block designation signal to select an even-numbered block is generated and outputted to the printhead, these signals are output-controlled such that drive to the odd-numbered block and drive to the even-numbered block are started alternately. On the other hand, when an odd-numbered block HB heat signal to drive HBs included in the odd-numbered block is generated and outputted to the printhead, and an even-numbered block HB heat signal to drive HBs included in the even-numbered block is generated and outputted to the printhead, these heat signals are output-controlled such that output of the even-numbered block HB heat signal is started prior to completion of output of the odd-numbered block HB heat signal.

Abstract: A substrate having plural recording elements and electrical leads for supplying electric signals to the recording elements includes electrical contacts for external electrical connection for reception of image signals used for driving the recording elements; and a processing circuit for converting signals which are serially supplied to the connecting contact to parallel signals to be applied to the recording elements.

Abstract: A driving condition setting method of an ink jet recording head enables stable discharge of an ink drop irrespective of a difference in a channel volume. In a thermal ink jet recording head, the displacement of a distance (channel volume) from a heating element to a nozzle surface is stored as data into a memory. The ink jet recording head is mounted on an ink jet recording device. A control unit of the ink jet recording device reads the data so as to set a driving condition (the number of pre-pulses) of the heating element based on the data. Therefore, even when the channel volume is displaced by a production error, an ink discharge state can be almost constant, and stable printing performance can be ensured.

Abstract: By effectively executing ejection recovery and aging process of an ink-jet printing head having a plurality of electrothermal transducers in an ink passage, ejecting characteristics including the ejecting speed and ejecting quantity of ink are more stably kept under the printing operation for ejecting the ink by driving the electrothermal transducers. For that purpose, shift values of application timings of driving pulses to be applied to heaters in the ink passage of the ink-jet printing head are changed under the ejection recovery after the ink-jet printing head is set to a printing apparatus and/or the aging process when the ink-jet printing head is fabricated.

Abstract: A drive unit for a liquid ejection head in which shrinkage of a pressure chamber and ejection of the liquid are caused by the application of a voltage to a piezoelectric body, wherein: (A) a drive pulse with an electric field exceeding the coercive electric field of the piezoelectric body is applied to the piezoelectric body during the liquid ejection operation such as printing, and (B) a pulse that eliminates polarization remaining in the piezoelectric body is applied to the piezoelectric body when no liquid ejection operation is conducted. As a result, a difference between the elements can be prevented even as time elapses, and a stable ejection characteristic can be obtained.

Abstract: Disclosed is a printhead capable of outputting information about the state of the printhead at a proper speed while increasing the printing data input speed. In a printing data transfer/discharge sequence of supplying clock signals CLK having a first frequency and a second frequency lower than the first frequency from a printing apparatus main body, and inputting printing data DATA which influences an increase in printing speed, printing data is transferred in synchronism with a first clock signal. In a data read sequence of outputting information MEM_OUT and TMP_OUT about the state of the printhead after the printing data input period, information is output in synchronism with a second clock signal.

Abstract: In ink jet printing by ejecting ink drops, a deviation in droplet ejection is corrected to less than one dot width. A delay value is determined from a deviation amount of dots formed by each nozzle array, and drive timing of an ejection heater is delayed in four steps in each of block units according to the delay value so as to adjust the ejection timing of an ink drop. Exact superposition of printing dots of ink and treatment liquid ejected from each nozzle array is thereby simply achieved.

Abstract: Disclosed is a piezo bending transducer drop-on-demand print head and a method of actuating it. Each of the piezo bending transducers of a piezo bending transducer drop-on-demand print head is subjected to a sequence, corresponding to the desired print image, of triggering pulses each effecting a drop discharge movement and, assigned to each triggering pulse, each piezo bending transducer neighboring the piezo bending transducer triggered by the triggering pulse is subjected to a compensating pulse deflecting it. The piezo bending transducer drop-on-demand print head has a nozzle plate with nozzles arranged in series. Respectively assigned to each nozzle is a piezo bending transducer which can be subjected to a triggering pulse accompanied by a drop being discharged from the respective nozzle. There is a control device by which each of the piezo bending transducers can be subjected to triggering pulses and compensating pulses in accordance with the method of the invention.

Abstract: A narrow ink jet printhead having three columnar arrays of ink drop generators configured for multi-pass color printing at a print resolution having a media axis dot spacing that is less than the columnar nozzle spacing of the ink drop generators. The ink jet printhead more particularly includes high resistance heater resistors and efficient FET drive circuits that are configured to compensate for variation in parasitic resistance presented by power traces.

Abstract: The invention relates to a droplet deposition apparatus comprising an actuator (100) having a plurality of spaced piezoelectric walls defining channels, said walls having opposed sides; said opposed sides being provided with electrodes being adapted to receive electric signals to deform said walls to cause liquid in said channels to be ejected therefrom; said signals having wave forms; and a control unit (130) for defining the wave forms of said electric signals; wherein the control unit comprises means (500, 514) for providing an individually adapted signal slope of the wave form to selected electrodes (E) so as to compensate for individual channel deviations.

Abstract: A printhead for an acoustic ink printer includes at least one acoustic generator for producing acoustic sound waves. The printhead also includes at least one lens. Each lens corresponds to one of the acoustic generators. A fluid is positioned over the at least one lens. A cover is positioned over the fluid. The cover includes at least one aperture. Each of the apertures corresponds to one of the lenses. An edge portion of each aperture contacts the fluid, thereby forming a corresponding meniscus in the fluid. Each lens focuses the acoustic sound waves produced by the respective acoustic generator to an ejection point on the corresponding meniscus. A droplet of the fluid is ejected from each of the ejection points. Directions of each of the acoustic sound waves are at respective oblique angles with respect to the corresponding meniscus. A direction at which each droplet is ejected from each ejection point is a function of a duration of the acoustic sound wave generated by the acoustic generator.

Abstract: An electrical interconnect for an inkjet printhead comprising an ink-ejecting semiconductor die is described. The ink-ejecting die further comprises a substrate having an opposing upper surface, lower surface, and a thin film stack. The upper surface of the substrate is beveled on at least one edge such that a lower portion of the bevel is below an upper portion of the bevel. A conductive material trace is disposed on top of at least a portion of the upper surface and the thin film stack and on the bevel towards the lower portion of the bevel. An electrical conductor is coupled to the conductive material trace at a predetermined location below the upper portion of the bevel.

Abstract: A liquid discharge head comprises discharge ports for discharging liquid; electrothermal transducing elements arranged to face the discharge ports; and a layer covering the electrothermal transducing elements. The gap between the discharge ports and the covering layer is 34 &mgr;m or less, and the thickness of the covering layer is 6,300 Å or less. One of the electrothermal transducing elements generates thermal energy of 0.0027 &mgr;J/&mgr;m2 or less by the application of a single driving pulse of 1.2 &mgr;s or less to produce film boiling to discharge liquid from the corresponding discharge port.

Abstract: An ink jet printing apparatus capable of forming a high quality multivalued image without using a plurality of print heads and suited for a size reduction is provided. In an ink jet printing apparatus in which the electrothermal transducers are heated by a drive pulse to generate bubbles in ink and in which the pressure of the bubbles is used to eject ink droplets from nozzles onto a print medium to print an image, the drive voltage and the drive pulse width for the print head are changed simultaneously in accordance with print data. For example, when ejecting small droplets, the drive voltage for the nozzles is increased and the drive pulse width shortened. When ejecting large droplets, the drive voltage is lowered and the drive pulse width elongated.

Abstract: A dynamic memory based integrated circuit ink jet firing cell that includes a heater resistor, a drive transistor, and a dynamic memory circuit for storing firing data only for such heater resistor. Also disclosed is an integrated circuit firing array that includes a plurality of dynamic memory based firing cells divided into a plurality of fire groups of firing cells, each fire group having a plurality of subgroups; data lines for providing energizing data to the firing cells; control lines for providing control information to the firing cells wherein all firing cells within a subgroup are connected to a common subset of the control lines so as to be controlled to concurrently store energizing data; and a plurality fire lines for supplying energizing energy to the firing cells, wherein all firing cells of a fire group receive energizing energy from only one fire line.

Abstract: A driving condition setting method of an ink jet recording head enables stable discharge of an ink drop irrespective of a difference in a channel volume. In a thermal ink jet recording head, the displacement of a distance (channel volume) from a heating element to a nozzle surface is stored as data into a memory. The ink jet recording head is mounted on an ink jet recording device. A control unit of the ink jet recording device reads the data so as to set a driving condition (the number of pre-pulses) of the heating element based on the data. Therefore, even when the channel volume is displaced by a production error, an ink discharge state can be almost constant, and stable printing performance can be ensured.

Abstract: The present invention corrects variations in characteristics of each printing element of a printing head to print high-grade images. To achieve this, the present invention provides an ink jet printing head that uses thermal energy generated by a heat-generating resistor to eject an ink from an ink ejection opening, wherein a plurality of wirings with different wiring resistances are connected to the heat-generating resistor. A transistor selected one of the plurality of wirings to conduct current through the heat-generating resistor.

Abstract: A fluid ejection device has a first set of primitives within a first region of a substrate of the device, and a second set of primitives within a second region of the substrate. The second set of primitives is electrically isolated from said first set of primitives. The number of primitives of said first set of primitives is different from the number of primitives of said second set of primitives.

Abstract: The invention provides a printhead for an ink jet printer and a method for making a printhead for an ink jet printer. The printhead includes a printhead body having a chip surface side, an ink surface side opposite the chip surface side and a first coefficient of thermal expansion (CTE). A semiconductor chip containing ink ejector devices is adhesively attached to the chip surface side of the printhead body. A stiffener is adhesively attached to the ink surface side to provide body stiffening during curing of the adhesive. The semiconductor chip has a second CTE and the stiffener has a third CTE wherein the second and third CTE's have a similar value. The invention provides an improved structure for printheads which resist warpage and/or breakage of the semiconductor chips during the manufacturing process used to make the printheads.

Abstract: A compact thermal ink jet printhead including a printhead substrate, a plurality of side by side columnar arrays of drop generators formed in the printhead substrate, and drive circuits formed in the printhead substrate for energizing each ink drop generator. The printhead substrate has an ink drop generator packing density of at least 10.43 ink drop generators per square millimeter.

Abstract: The functions of an ink-jet print head drive transistor and ink-ejecting heat transducer (resistor) are combined into a single component, a high-temperature transistor. The transistor is turned on when an ink drop is required, and the resultant heat generated by the transistor is used for creating the vapor bubble for ejecting the ink drop. The drop-ejector transistor is a silicon carbide transistor.

Abstract: The present disclosure relates to an inkjet printhead having a plurality of drop generators that selectively eject ink in response to activation. The inkjet printhead includes first and second drop generators disposed on the printhead. Each of the first and second drop generators are configured for connection to a source of drive current. The inkjet printhead also includes a control device configured for connection to a periodic address signal and first and second periodic enable signals. The control device is responsive to the first periodic enable signal and periodic address signal for enabling the first drop generator for activation in response to drive current. The control device is responsive to the second periodic enable signal and periodic address signal for enabling the second drop generator for activation in response to drive current.

Abstract: An ink jet print head is controllable based at least in part on q number of first control signals and p number of second control signals. The print head includes a print head integrated circuit chip having ink-heating resistors for generating heat when activated. The print head chip also has a switching circuit for receiving the first and second control signals, and for selectively activating the resistors by allowing electrical current to flow through selected resistors based at least in part on the first and second control signals. The switching circuit is operable in either a first operating mode or a second operating mode, where q is equivalent to q1 in the first operating mode, and is equivalent to q2 in the second operating mode, and where q1 is twice q2. In the first operating mode, p is equivalent to p1, and in the second operating mode, p is equivalent to p2, where p2 is twice p1. The product of q1 multiplied by p1 is equivalent to the product of q2 multiplied by p2.

Abstract: An accelerated illuminate response system controls a light emitting diode (“LED”), for instance, in an optical sensor system that monitors ink droplets on a print media in an inkjet printing mechanism to adjust future printing for optimal images. A printhead carriage scans an optical sensor across the printed media to determine droplet location, color and hue. The sensor uses an LED to illuminate the media in response to an LED drive signal, and a photodetector to receive light reflected from the media. The LED drive signal first applies a low level pre-warming current, then a high current pulse for a selected duration, and thereafter a normal drive current during a secondary illuminate response until the LED reaches a selected illumination value at or near steady-state conditions. An inkjet printing mechanism having such an optical sensor system is also provided, along with a method of illuminating an LED.

Abstract: A printing head is intended to achieve high reliability and a production method of the printing head is intended to achieve high yield at low cost. A liquid ejecting printing head employs a base body, in which an electrothermal transducer element, a driving functional element for driving the electrothermal transducer element, a wiring electrode connecting between the electrothermal transducer element and the driving functional element, and an insulation layer provided on the wiring electrode are formed on a substrate. The electrothermal transducer element has a heat generating resistor formed of a material selected from the group consisting TaN, HfB2, Poly-Si, Ta—Al, Ta—Ir, Au and Ag. A protective layer above the heat generating body is formed of an insulative compound deposited to be low density to high density in order.

Abstract: A recording unit is provided which comprises an ink housing part for housing an ink containing a coloring material and an aqueous medium, and an ink jet head part for discharging an ink droplet of the ink, wherein at least one color of the ink is a polyvalent metal salt containing ink further containing a polyvalent metal salt; the ink Jet head part for discharging at least the polyvalent metal salt containing ink has a configuration comprised of a substrate having on a base body, a heat-generating resistor member forming a heat-generating part, an electrode wire electrically connected to the heat-generating resistor member, and a cavitation resistant film provided on the heat-generating resistor member and the electrode wire via an insulating protection layer, and a liquid flow path communicating with a discharge port for discharging an ink droplet provided corresponding to the heat-generating part; and the cavitation resistant film comprises a layer comprised of an amorphous alloy containing Ta and a layer

Abstract: A dynamic memory based integrated circuit ink jet firing cell that includes a heater resistor, a drive transistor, and a dynamic memory circuit for storing firing data only for such heater resistor. Also disclosed is an integrated circuit firing array that includes a plurality of dynamic memory based firing cells divided into a plurality of fire groups of firing cells, each fire group having a plurality of subgroups; data line for providing energizing data to the firing cells; control lines for providing control information to the firing cells wherein all firing cells within a subgroup are connected to a common subset of the control lines so as to be controlled to concurrently store energizing data; and a plurality fire lines for supplying energizing energy to the firing cells, wherein all firing cells of a fire group receive energizing energy from only one fire line.

Abstract: An ink-jet recording method for recording on a recording medium, includes the steps of preparing an ink-jet recording head which has a plurality of electro-thermal conversion elements that can be independently driven in an ink channel communicating with an ejection orifice, and ejects ink from the ejection orifice by bubbling the ink upon driving the electro-thermal conversion elements and ejecting the ink from the ejection orifice by relatively shifting the bubbling timings defined upon driving of at least two electro-thermal conversion elements within the range in which the ejection characteristics of the ink do not deteriorate as compared to those obtained when the ink is bubbled by simultaneously driving the at least two electro-thermal conversion elements, when the ink is bubbled by driving the at least two electro-thermal conversion elements. Also, an ink-jet recording head using the ink-jet recording method, and an ink-jet recording apparatus using the ink-jet recording head are disclosed.

Abstract: A method and a structure for measuring the temperature of heating elements of an ink-jet printhead are provided, wherein an extra metal layer or semiconductor layer is formed on the ink-jet chip having driving elements to precisely measure the temperature of each individual heating element. The structure includes: an ink-jet device including a heating element for heating liquid ink; a transistor driver for driving a transistor to control heating of the heating element; and a temperature-sensing layer located between the ink-jet device and the transistor driver and under the heating element, the temperature-sensing layer having two terminals, one connecting to the transistor and the other connecting to an electrode terminal connected to a printer, wherein the ink-jet device connects to the transistor driver through the temperature-sensing layer.

Abstract: A recording head for recording data on a recording medium includes a heat generating resistor layer and an electrode layer formed on an element substrate, the heat generating resistor layer and the electrode layer constituting an electrothermal converter for generating heat energy, a driver element built in the element substrate for driving the electrothermal converter and an element built in the element substrate for detecting the characteristics of the driver element.

Abstract: An ink jet head includes ink ejection outlet for ejecting ink, a plurality of heat generating resistors for generating thermal energy contributable to ejecting the ink, and ink flow path comprising the plurality of the heat generating resistors and being in fluid communication with the ejection outlet, the heat generating resistors generating the thermal energy upon receiving a driving signal, so that a bubble is generated in the ink within the ink flow path to eject the ink through the ink ejection outlet; wherein the plurality of the heat generating resistors are arranged in parallel, relative to the ink ejecting direction, in the ink flow path, and the distances from the heat generating centers of the heat generating resistors to the ejection outlet are different.

Abstract: A liquid discharge method for discharging liquid by use of a liquid discharge head provided with liquid discharge nozzles having a plurality of electrothermal converting members capable of forming bubbles for discharging a liquid droplets comprises the step of using a driving condition in a range where the discharge speed of droplets is made substantially constant, while the amount of droplet is made changeable with the timing difference of driving when droplets are discharged by driving a plurality of the electrothermal converting members one after another. With the adoption of the method thus structured, high quality prints can be obtained without deviation of impact positions irrespective of the dot diameters, larger or smaller, for a significant enhancement of image representation.