Abstract: In some examples, a print cartridge comprises a printhead die that includes a die sliver molded into a molding. The die sliver includes a front surface exposed outside the molding to dispense fluid, and a back surface exposed outside the molding and flush with the molding to receive fluid. Edges of the die sliver contact the molding to form a joint between the die sliver and the molding.

Abstract: There are provided a head chip, a liquid jet head, and a liquid jet recording device capable of enhancing the reliability. The head chip according to an embodiment of the disclosure includes a first plate having a plurality of pressure chambers adapted to apply pressure to a liquid, a second plate having a plurality of nozzle holes adapted to jet the liquid in response to application of the pressure, and a third plate disposed between the first and second plates, and provided with a plurality of through holes individually communicated with the plurality of pressure chambers and the plurality of nozzle holes, respectively. In the through hole, a second opening region opposed to the second plate is larger than a first opening region opposed to the first plate.

Abstract: An ink jet recording method capable of recording a high-quality image in which occurrence of fine unevenness is decreased. The ink jet recording method includes recording an image by ejecting ink from a recording head including an ejection orifice for ejecting the ink, an ejection element generating energy for ejecting the ink, and first and second flow paths that communicate between the ejection orifice and the ejection element and in which the ink flows. The ink jet recording method includes an ejection step of ejecting the ink from the ejection orifice, and a flow step of flowing the ink from the first flow path to the second flow path separately from the ejection step. The ink is an aqueous ink having a dynamic surface tension of 35 mN/m or more to 48 mN/m or less at 10 milliseconds.

Abstract: A liquid ejecting head (recording head) includes a structure (flow path member) having a plurality of stacked plates (a nozzle plate, a flow path plate, and a diaphragm) in which end surfaces at both sides in one direction are aligned. At least two plates of the plates (the nozzle plate, the flow path plate, and the diaphragm) have different coefficients of linear expansion in the one direction, and holding members are fixed to the end surfaces of the structure (flow path member) at both sides in the one direction, the holding members having stiffness higher than stiffness of a plate having the highest coefficient of linear expansion in the one direction among the plates (the nozzle plate, the flow path plate, and the diaphragm).

Abstract: A liquid ejecting apparatus RIM which ejects liquid onto a medium includes a carriage which includes a control substrate which configures at least a part of a control unit which controls driving of the entire liquid ejecting apparatus, a plurality of ejecting units which eject the liquid, a plurality of driving substrates which are connected to the control substrate, connected to the plurality of ejecting units in one-to-one correspondence, and drives the ejecting unit, an ejecting unit-driving substrate accommodating unit which accommodates the ejecting unit and the driving substrate, and a control substrate accommodating unit which accommodates the control substrate, in which the plurality of driving substrates are connected to the control substrate.

Abstract: A liquid discharging apparatus includes: a liquid discharging head having nozzles forming a nozzle row along a first direction, and having a nozzle surface in which the nozzles are formed; and a relative movement device configured to relatively move a recording medium and the liquid discharging head in a second direction orthogonal to the first direction. The nozzle surface is formed with first recesses arranged on both sides of the nozzle row in the second direction, and forming two first recess rows each of which is along the nozzle row. The first recesses are separated from each other in the first direction by partition walls, respectively; and a length of an opening of each of the first recesses in the first direction is longer than a length of an end surface of each of the partition walls in the first direction.

Abstract: In one example, a molded printhead includes a printhead die in a molding having a channel therein through which fluid may pass directly to a back part of the die. The front part of the die is exposed outside the molding surrounding the die. Electrical connections are made between terminals at the front part of the die and contacts to connect to circuitry external to the printhead.

Abstract: The disclosure discloses a printed-matter producing device including a cutting device, and a controller. The cutting device is disposed downstream of a thermal head at a predetermined separation distance. The controller is configured to execute a coordination control process, a data acquisition process, and a data shift process. In the coordination control process, a feeder, the thermal head, and the cutting device are controlled in coordination with each other to form a print while feeding a print-receiving medium, to stop the feeding after feeding by a first feeding distance corresponding to the separation distance and to execute a cutting process, and to subsequently resume the feeding to produce a printed matter. In the data shift process, a facing position on the print data corresponding to a position at which the thermal head faces the print-receiving medium is shifted.

Abstract: An inkjet printer includes a table for a recording medium, an injection head including nozzles arrayed in a first direction, the injection head injecting ink toward the recording medium, a movement mechanism moving, in the first direction, one of the table and the injection head with respect to the other of the table and the injection head, and a controller communicably connected with the injection head and the movement mechanism, the controller driving the injection head and the movement mechanism. The controller includes a printing controller printing an image by using portion of the plurality of nozzles, the portion being selected based on a nozzle check to determine if any of the nozzles has an injection defect.

Abstract: A method of printing an image using a printing system having first and second overlapping printhead segments. The method includes the steps of: (i) identifying a strip of the image to be printed in an overlap region of the first and second printhead segments; (ii) identifying a foreground image and a background image for image content contained in the strip; (iii) determining a seam in the foreground image; (iv) printing the foreground image using only nozzles from the first printhead segment at one side of the seam and only nozzles from the second printhead segment at the other side of the seam; and (v) printing the background image using nozzles from both the first and second printhead segments across the overlap region.

Abstract: An apparatus includes a reservoir and a printhead. The printhead includes a support structure including a deformable portion defining at least a top surface of a pumping chamber, a flow path extending from the reservoir to the pumping chamber to transfer fluid from the reservoir to the pumping chamber, and an actuator disposed on the deformable portion of the support structure. A trench is defined in a top surface of the actuator. Application of a voltage to the actuator causes the actuator to deform along the trench, thereby causing deformation of the deformable portion of the support structure to eject a drop of fluid from the pumping chamber.

Abstract: Provided is a print bar. The print bar comprises a reference element to align the print bar with a mounting structure of a printer. The print bar further comprises a flat elongate sheet metal portion with constant height whose length is larger than its width and whose width is larger than its height. Moreover, the print bar comprises a plurality of plastic members detachably mounted to a mounting surface of the flat elongate sheet metal portion. The plurality of plastic members is spaced apart from each other in the length direction.

Abstract: The methods and apparatuses relate to digitally printing a substrate using first and second printheads. The first printhead includes a first printhead width and the second printhead includes a second printhead width. The first printhead overlaps with the second printhead such that the first printhead width overlaps with the second printhead width in a cross direction. The overlapping first and second printheads form a first print zone, an overlapping print zone, and a second print zone. The first printhead may deposit droplets onto the substrate in the first print zone and/or the overlapping zone. The second printhead may deposit droplets onto the substrate in the overlapping print zone and/or the second print zone. The droplets deposited in the overlapping print zone may unite to illustrate multiple colors and/or may remain ununited. By using overlapping printheads, various colors may be illustrated and the width of the substrate may be printed on.

Abstract: A controller controls printing heads to print a page information mark with black ink to perform line flushing. The printing heads each have a plurality of inkjet nozzles for discharging ink being disposed in parallel in a width direction of web paper. Upon printing the mark, when an overlap region is present in which a mark printable region overlaps a line flushing region with ink other than the black ink, the controller performs control to decrease an ink discharge amount per unit area in the overlap region in the mark printable region to be smaller than that in the mark printable region except for the overlap region and the line flushing region. This causes a decreased total ink discharge amount in the overlap region.

Abstract: A method of printing an image using a printing system having first and second overlapping printhead segments. The method includes the steps of: (i) identifying a strip of the image to be printed in an overlap region of the first and second printhead segments; (ii) determining a continuous seam in the strip based on a cost function, the cost function including a parameter selected from the group consisting of: (a) minimizing a density of printed ink along the seam; and (b) maximizing a luminance along the seam; and (iii) printing the image using the first and second printhead segments, the printing including stitching the first and second printhead segments across the seam. The strip contains variable image content and the seam has a varying position within the strip.

Abstract: A flexible probe card according to the present invention includes a compression layer; a transport layer coupled to the compression layer; and a contact layer coupled to the transport layer. The compression layer is formed of encapsulated closed cell polyurethane foam. The transport layer includes connectors for coupling the flexible probe card to a tester. The contact interface layer includes embedded conductive wires placed in a fixed grid pattern in a silicon rubber layer, without a specific connector pattern associated either with the transport layer or a device under test.

Abstract: A liquid discharge head includes a plurality of nozzles to discharge liquid, a plurality of individual liquid chambers communicating with the plurality of nozzles, respectively, a common liquid chamber to supply the liquid to the plurality of individual liquid chambers, and a liquid supply member including a liquid supply channel to supply the liquid to the common liquid chamber. The liquid supply member includes a first member including a part of the liquid supply channel, a second member including a gas chamber, and an elastic member disposed between the first member and the second member and forming a wall of the liquid supply channel of the first member and a wall of the gas chamber of the second member. The gas chamber of the second member is disposed opposite the liquid supply channel of the first member via the elastic member.

Abstract: A liquid discharge head which discharges a liquid, includes, a substrate on which plural heaters configured to generate heat for discharging a liquid are provided, an electroconductive protective film configured to cover the plural heaters and define a group consisting of the covered plural heaters in the substrate, a discrete wiring connected with the protective film for each group in the substrate, a common wiring connected with the discrete wiring for each group in common, and a terminal connected with the common wiring and configured to electrically connect the common wiring with an outside of the substrate, wherein electrical resistance of the discrete wiring is higher than electrical resistance of the common wiring.

Abstract: An inkjet head comprises a drive section, a nozzle plate, a substrate and a wiring section. The drive section comprises two integral piezoelectric members of which polarization directions are opposite with respect to the longitudinal direction of the piezoelectric member, wherein a plurality of grooves arranged from one piezoelectric member to the middle of the other piezoelectric member and a plurality of holes arranged across the two piezoelectric members are alternately arranged along the longitudinal direction of the piezoelectric member. The nozzle plate is fixed on one main surface of the one piezoelectric member and comprises a plurality of nozzle holes facing the plurality of the grooves. The substrate is fixed with the other main surface of the other piezoelectric member. The wiring section is arranged on an inner surface of the hole and at a position facing the hole of the substrate.

Abstract: A liquid ejection head includes a substrate in which at least four inlets to which a liquid is supplied are arranged, and an ejection port forming member provided with an ejection port from which the liquid supplied to the inlets is ejected and provided in the substrate. The inlets are each formed along a first direction and are arranged in a second direction which crosses the first direction. A plurality of inter-inlet areas sandwiched between the inlets adjacent to each other has at least two types of areas different in distance between the inlets adjacent to each other, and, among the inter-inlet areas, an area positioned on each of both ends of the substrate is different from an area in which the distance between the inlets is the shortest.

Abstract: In one example, a print bar structure includes a beam having two flanges connected by a web and a planar surface along a longitudinal edge of each flange, a printhead mounting structure attached to the beam along the planar surfaces to mount a printhead, and a fluid flow structure positioned between the flanges to carry printing fluid to the printhead mounting structure.

Abstract: A discharge port array is inclined to a second direction B at an angle ? that satisfies a relation of tan ?=d2/(N×d1), where d1 is a distance between discharge ports within the discharge port array in the second direction B, and d2 is a distance between two adjacent discharge ports within each group in a first direction.

Abstract: Method for manufacturing panels having a decorative surface, wherein the panels at least comprise a substrate and a top layer, wherein the top layer comprises a paper layer having a printed pattern, and wherein the method at least comprises the step of providing the paper layer with thermosetting resin by transporting the paper layer through a resin application device in a resin application direction, and the step of providing the paper layer with at least a portion of the printed pattern by means of a digital inkjet printer, wherein the printed pattern comprises a wood motif having wood nerves extending generally in a nerve direction substantially corresponding to the resin application direction.

Abstract: A printer is disclosed. One printer includes a first head unit being elongate in a longitudinal direction. The first head unit has a first nozzle group having a plurality of first nozzles arrayed with a first pitch along the longitudinal direction. The printer includes a second head unit being elongate in the longitudinal direction. The second head unit has a second nozzle group having a plurality of second nozzles arrayed along the longitudinal direction. The second nozzle group includes a plurality of nozzle sets. Each of the plurality of the nozzle sets includes some of the plurality of second nozzles. The second nozzles in each of the plurality of the nozzle sets arrayed with the first pitch along the longitudinal direction. The plurality of the nozzle sets are arrayed with a second pitch along the longitudinal direction. The second pitch is different from the first pitch.

Abstract: An ink discharge device including an ink, an ink discharge head, and a negative pressure generator is provided. The ink comprises water, a colorant, an organic solvent X having a solubility parameter of from 8.9 to 12.0 and comprising no glycol ether compound, and a copolymer comprising a structural unit represented by the following formula (1): where R1 represents a hydrogen atom or methyl group and Y represents an alkylene group having 2 to 18 carbon atoms. The ink discharge head includes a nozzle to discharge the ink, a plurality of individual liquid chambers in communication with the nozzle, a flow-in channel to let the ink flow into the individual liquid chambers, and a flow-out channel to let the ink flow out from the individual liquid chambers. The negative pressure generator is configured to generate a negative pressure that lets the ink flow out from the individual liquid chambers.

Abstract: A dot recording apparatus executes recording of dots that are included in a common region using a plurality of main scan passes, and, in each main scan pass, executes a first recording, which records a supercell, which is a mass of dot groups in which at least a portion of a boundary line is not parallel to either the main scanning direction or the sub-scanning direction, and a second recording, which records dots so as to be smaller than the supercell, which is recorded in the first recording, in positions in the main scanning direction that differ from positions in the main scanning direction, which the first recording executed.

Abstract: Tubular polymeric structures are formed by creating a convex mold conforming to a fluid pathway design, depositing a coating of polymer over the mold, and in situ removing the mold without drawing it against the polymer.

Abstract: A printer is disclosed. The printer has a print engine that mounts a first printhead and a second printhead adjacent to the first printhead in a staggered line of overlapping printheads. Each printhead has at least one row of nozzles. The blending nozzles in the first printhead overlap with blending nozzles in the second printhead. When printing, the non-overlapping nozzles in the first printhead use a default ink modulation amount and the blending nozzles in both printheads use a scaled ink modulation amount.

Abstract: A liquid discharge head includes a first recording element substrate, a second recording element substrate, and a third recording element substrate successively arranged in a longer direction of the liquid discharge head, the first, second, and third recording element substrates each including a discharge port configured to discharge a liquid and an energy-generating element configured to generate energy used for discharging the liquid; a first support member supporting an end part of the first recording element substrate on a side of the second recording element substrate and an end part of the second recording element substrate on a side of the first recording element substrate; and a second support member supporting an end part of the second recording element substrate on a side of the third recording element substrate and an end part of the third recording element substrate on a side of the second recording element substrate.

Abstract: A liquid discharge head includes a recording element substrate for discharging a liquid and a housing with the recording element substrate attached thereto. A plurality of holes having openings on a back side of an attachment surface of the housing to be attached to the carriage, are juxtaposed in a direction intersecting with a vertical direction in a state where the liquid discharge head is attached to the carriage. Two positioning bosses, on the attachment surface, are formed above two holes at both end sides of a plurality of the juxtaposed holes or above portions on an inner side than the two holes, and configured to contact the carriage to determine a position of the liquid discharge head on the carriage.

Abstract: According to one embodiment, a method for manufacturing an inkjet head includes attaching a piezoelectric body facing the substrate, forming slanting side surfaces on the piezoelectric body, the slanting side surfaces extending between a first surface and a second surface of the piezoelectric body such that first surface has a remaining area that is less that a remaining area of second surface, forming a groove in the piezoelectric body from the first surface towards the second surface, the groove passing through two slanting side surfaces on opposite sides of the piezoelectric body, forming a conductive film on an inner surface of the groove, trimming portions of the conductive film proximate to the first surface and the slanting side surfaces such that the conductive film is separated from the first surface and the slanting side surfaces at outer edges of the groove, and forming an insulating film over the conductive film.

Abstract: A modular print engine unit for a media-wide array printer includes multiple printhead modules, each printhead module having printing dies, and each printing die having multiple nozzles. The modular print engine unit is independently operable relative to another modular print engine unit within the media-wide array printer.

Abstract: A printing unit includes: a line feed plate moving with a carriage in a line feed operation area; and guide members provided on a unit frame, engaging with the line feed plate, and guiding the carriage and the line feed plate toward one side in a left-right direction as the carriage and the line feed plate move toward one side in a front-back direction in the line feed operation area. Each guide member includes: a line feed guide extending toward one side in the left-right direction as it goes toward one side in the front-back direction and guiding the carriage toward one side in the left-right direction as the carriage moves toward one side in the front-back direction in the line feed operation area; and regulating sections continuing at least to one end in the front-back direction of the line feed guide and regulating the movement of the carriage in the left-right direction.

Abstract: A mounting structure for a plurality of print head units includes a frame; a rigid support mounted on the frame, the support having a plurality of mounting sites each of which is adapted to hold an individual print head unit; and an adjusting system for positional adjustment of the print head units relative to the frame. Each mounting site has at least one adjusting mechanism for individually adjusting, in at least one degree of freedom, a position of the print head unit that is held in that mounting site.

Abstract: To provide an inkjet printer and a printing method that can print a new pattern to be printed at an appropriate position relative to an existing pattern. An inkjet printer newly prints a new pattern to be printed, that is different from an existing pattern, on an outer surface of a spherical print object on which the existing pattern is printed. The inkjet printer includes a retainer that retains the print object, a carriage, and a projector. The carriage prints the new pattern to be printed on the outer surface of the print object. The projector projects at least a part of the existing pattern and the new pattern to be printed together on the outer surface of the print object retained by the retainer.

Abstract: An ultraviolet curing ink can be sufficiently leveled, and attachment of, for example, dust can be prevented. In an ink-jet printer, a carriage capable of reciprocating in a scanning direction is mounted with an ink-jet head for ejecting a color ink and a clear ink and ultraviolet irradiation devices for emitting ultraviolet rays. A control unit performs control so that in the forward movement of the carriage, a color ink is ejected and applied to a medium, and in the backward movement of the carriage, ultraviolet rays are irradiated to the color ink deposited on the medium and the color ink is cured. Subsequently, the medium is fed in a feed direction, and the clear ink is ejected and applied to the surface of the cured color ink in the forward movement of the carriage. In the backward movement of the carriage, the clear ink applied to the medium is irradiated by ultraviolet rays and is cured.

Abstract: A discharge port array unit including discharge ports having a small discharge port diameter is not arranged in a position adjacent to a discharge port array unit generating a strong airflow, and a discharge port array unit including discharge port array having not a small discharge port diameter is arranged in the position adjacent to the discharge port array unit generating a strong airflow.

Abstract: In one example, a printhead assembly module includes an upstream row of printheads and a downstream row of printheads. The upstream and downstream rows of printheads are offset from one another such that a printhead in the upstream row extends past the downstream row at one end of the module and a printhead in the downstream row extends past the upstream row at the other end of the module.

Abstract: Disclosed are an ink-jet printing head, an ink-jet printing method using the ink-jet printing head and an ink-jet printing device including the ink-jet printing head. The ink-jet printing head includes a chamber for accommodating ink and nozzle sets provided on a sidewall of the chamber where ink is sprayed. The nozzle sets are used for ink-jet printing on pixels at different positions, respectively. Each of nozzle sets includes sub-nozzles and the sub-nozzles in each nozzle set can spray different volumes of ink. In the printing head, by providing sub-nozzles having different ink spraying volumes in each nozzle set, ink droplets having desirable volumes can be sprayed from nozzle sets such that total volumes of ink droplets sprayed at different positions from nozzle sets could be more accurate. Therefore, a thickness of a film layer formed by ink-jet printing can be flexibly controlled and adjusted, while having a significantly improved accuracy.

Abstract: An inkjet material dispenser system includes a printhead member. According to one exemplary embodiment, the printhead member includes at least one drop ejector including an insulating stack layer and a top orifice surface defining an orifice, wherein a ratio of a diameter of the orifice to a height of the insulating stack layer (O/L ratio) is at least 1.0.

Abstract: A printhead assembly including an ink cartridge body made of a material selected from the group of materials consisting of: nylon, polyethersulfone, polypropylene, polyethylene, polyoxymethylene and other materials that are compatible with ketone, acetate and alcohol based inks, an ink reservoir disposed within the ink cartridge body and adapted to receive and contain ink, and a printhead chip provided on the ink cartridge body and in fluid communication with the ink reservoir so as to receive ink from the ink reservoir for ejection of the ink onto a print medium.

Abstract: In an inkjet printer, from one side of a main scanning direction, first through fourth ultraviolet irradiation devices arrayed in the main scanning direction at least partially overlap first and second recording heads. A distance in the main scanning direction between a middle position in the main scanning direction of the first recording head and a middle position in the main scanning direction of the first ultraviolet irradiation device is equal to a distance in the main scanning direction between the middle position of the first recording head and a middle position in the main scanning direction of the second ultraviolet irradiation device.

Abstract: A liquid droplet discharging device includes a liquid droplet discharging head including a nozzle hole, a pressurized liquid chamber communicating with the nozzle hole, a vibration plate constituting a side of the pressurized liquid chamber, a control device, and a thin film piezoelectric substance to vibrate the vibration plate by a drive voltage to discharge liquid droplets and a voltage application device to apply a voltage waveform having a voltage equal to or greater than the drive voltage between when the main power is activated and when first print starts.

Abstract: There are provided a liquid ejecting head, an ejecting element substrate and a liquid ejecting apparatus that can suppress degradation in print quality. Therefore in an ejecting element substrate arranged the closest to the center of a support member, a flow resistance of a flow passage corresponding to an ejection opening of an ejection opening array arranged the closest to the center of the ejecting element substrate is made high.

Abstract: An organic electroluminescent device includes first and second substrates, first and second electrodes, an insulating layer, an organic light emitting layer, and an intermediate layer. The first electrode is provided on the first substrate. The insulating layer is provided on the first electrode. The insulating layer includes first and second openings. The second electrode includes first and second conductive parts. The first conductive part covers the first opening. The second conductive part covers the second opening. The organic light emitting layer includes first and second light emitting parts. The first light emitting part is provided between the first electrode and the first conductive part. The second light emitting part is provided between the first electrode and the second conductive part. The second substrate is provided on a stacked body including above. The intermediate layer is provided between the stacked body and the second substrate.

Abstract: A dot recording apparatus performs multi-pass recording through which recording of dots is terminated in main scanning passes of N times (N is an integer equal to or greater than two) on a main scanning line, the multi-pass recording is performed for respective supercell regions defined as a region including pixel positions on which recording of dots is performed in each main pass, a first supercell region recorded in a first pass in the supercell regions is configured with a first concave polygon having a concave portion and a convex portion, a second supercell region recorded in a second pass in the supercell regions is configured with a second concave polygon having a concave portion and a convex portion, and shapes of the first concave polygon and the second concave polygon are inversely symmetrical shapes in the main scanning direction.

Abstract: A fluid ejection head and a method of making a fluid ejection head. The method includes providing a semiconductor substrate containing a plurality fluid ejection actuators on a device surface thereof. The substrate is reactive ion etched to form one or more fluid supply vias therein. A flow feature layer is laminated to the substrate and is exposed to ultra violet (UV) radiation through a photo mask to provide UV exposed areas of the flow feature layer. The flow feature layer is heated to cross-link material in the UV exposed areas. A nozzle plate layer is laminated to the flow feature layer and exposed to UV radiation through a photo mask to provide UV exposed areas for nozzle holes. The nozzle plate layer is cross-linked with heat and the flow feature layer and nozzle plate layer are developed to form the flow features and nozzle holes in the respective layers.

Abstract: A laminated nozzle assembly includes a first end plate having first and second fluid inlets, a second end plate, and a plurality of nozzle plates positioned between the first and second end plates. A first fluid conduit is fluidically connected to the first fluid inlet. The first fluid conduit has a reservoir and one or more first openings. A second fluid conduit is fluidically connected to the second fluid inlet. The second fluid conduit has an inlet channel, a connecting channel and one or more second openings. An orifice assembly includes a first orifice fluidically connected to the first opening and a second orifice fluidically connected to the second opening. The first and second orifices are disposed in the same plate of the plurality of nozzle plates and are coplanar.

Abstract: A printing control apparatus, which controls printing of a printing area including an overlapping area on which printing is performed through a plurality of scanning operations, includes a printing data generation section that generates sets of printing data each associated with a corresponding one of the plurality of scanning operations in the overlapping area on the basis of an image data targeted for printing. The printing data generation section performs correction in accordance with a color density of the overlapping area in the image data.

Abstract: A liquid-ejecting head includes a nozzle plate having a nozzle opening that serves for liquid ejection; a channel-forming substrate including pressure-generating chambers that are in communication with the nozzle opening; a pressure generator that serves to generate pressure change in a liquid in the pressure-generating chambers; and a communication plate provided between the nozzle plate and the channel-forming substrate, the communication plate having a communication channel that forms a communication between the pressure-generating chambers and the nozzle opening. The communication plate has a circulation channel that is in communication with a common liquid chamber through the communication channel, the common liquid chamber being in communication with a plurality of the pressure-generating chambers in common.