Abstract: A pattern film formation method includes: discharging liquid from at least one first discharge head toward a first pattern film formation region on a substrate; and discharging liquid from a plurality of second discharge heads toward a second pattern film formation region that is narrower than the first pattern film formation region. A number of the second discharge heads is greater than a number of the at least one first discharge head.

Abstract: A liquid discharge recording head includes: a recording element substrate including a plurality of recording elements and discharge ports for discharging liquid; an electric wiring board including an opening for disposing the recording element substrate, and a plurality of electrode terminals disposed at an edge of the opening and electrically connected to a plurality of electrodes provided at an edge of the recording element substrate; a supporting plate supporting the recording element substrate and the electric wiring board and including a material having a linear expansion coefficient lower than the linear expansion coefficient of the electric wiring board; and a cover plate including a material having a linear expansion coefficient lower than the linear expansion coefficient of the electric wiring board, stacked on the electric wiring board on the supporting plate and fixed to both the supporting plate and the electric wiring board.

Abstract: The present invention provides a recording apparatus including recording heads each including a plurality of nozzle arrays that are arranged so as to overlap, wherein overlapping portions of the recording heads for two different colors are separated from each other with a distance therebetween in an array direction of nozzles.

Abstract: A system and method for mounting a fluid droplet ejection module to a frame is disclosed, where the fluid ejection module includes a mounting component having a mounting surface. A connector is configured to detachably attach to the frame and is positioned between the frame and the mounting surface of the fluid ejection module. A portion of a mating surface of the connector is positioned adjacent the mounting surface of a corresponding fluid ejection module and is in direct contact with the mounting surface. One or more recesses are formed in at least one of either the mounting surface of the fluid ejection module or the mating surface of the connector. The one or more recesses have a substantially uniform thickness and are filled with an adhesive. The adhesive is cured after aligning the fluid ejection module to the frame.

Abstract: A method for arranging liquid droplet ejection heads includes: arranging and fixing a plurality of inkjet liquid droplet ejection heads, ejecting a common functional liquid, on a common carriage plate, based on the amount of liquid droplets ejected from a number of ejecting nozzles in a nozzle row that each of the liquid droplet ejection heads has, with the heads shifted in a direction of the nozzle row, the heads being so arranged and fixed that in the heads closely aligned in the direction of the nozzle row, a difference between the amounts of liquid droplets ejected from two ejection nozzles located at each innermost end of the heads is within a predetermined range of tolerance, and the amounts of liquid droplets ejected from two ejection nozzles located at the outermost ends in the direction of the nozzle row are within a predetermined range of a reference amount.

Abstract: A liquid discharge head substrate includes an external terminal, a diode, a first conductive layer, a second conductive layer, and a third conductive layer. The external terminal is configured to connect to an external. The first conductive layer is connected to the external terminal for causing an input current to flow from the external terminal, and the diode includes an anode and a cathode. The second conductive layer is connected to the first conductive layer and one electrode of the anode and cathode, and causes a surge current generated when a surge voltage is applied from the external terminal, to flow from the first conductive layer to the one electrode. The third conductive layer is connected to the other electrode of the anode and the cathode and passes the surge current flowing from the one electrode to the other electrode.

Abstract: There is provided an inkjet recording apparatus including: plural jetting heads that jet respectively different types of photocurable color inks onto a conveyed recording medium and which, when layer-jetting the different types of photocurable color inks onto the recording medium, first jet the photocurable color ink having the largest light blocking effect among the plural photocurable color inks that the plural jetting heads layer-jet; and an irradiation device that applies light to the photocurable color inks that have been jetted onto the recording medium.

Abstract: An ink jet recording method includes a first process in which a coloring ink is recorded on a recording medium using an ink jet head so as to form a first image, a second process in which a background ink is recorded using the ink jet head so as to form a background image that covers the first image, and a third process in which a coloring ink is recorded using the ink jet head so as to form a second image, and a drying process is included between the first process and the third process.

Abstract: Among other things, in one aspect, an apparatus comprises features to enable mounting first and second jetting assemblies on a frame. The features comprise first and second alignment datums pre-fixed with respect to the frame for establishing respective positions of the first and second jetting assemblies, when mounted, so that at least some of the nozzles along a length of one of the jetting assemblies have predetermined offsets relative to at least some of the nozzles along a length of the other of the jetting assemblies, and an opening exposing all of the nozzles along the lengths of the first and second jetting assemblies are exposed to permit jetting of a fluid onto a substrate.

Abstract: Disclosed is an inkjet printhead that includes a plurality of fluid ejecting chips arranged in a plurality of rows. The plurality of fluid ejecting chips includes a first set of fluid ejecting chips arranged in a first row of the plurality of rows. The plurality of fluid ejecting chips includes a second set of fluid ejecting chips arranged in a second row parallel to the first row of the plurality of rows. Each fluid ejecting chip of the second set of fluid ejecting chips is configured between two consecutive fluid ejecting chips of the first set of fluid ejecting chips in a predetermined orientation. The inkjet printhead further includes a plurality of fluid vias and a plurality of bond pads. Further disclosed are fluid ejecting chips for being used in an inkjet printhead.

Abstract: In a method for manufacturing a dispersion which includes a dispersion medium and particles dispersed therein, the method includes bringing at least two types of liquids into contact with each other to form a reaction product comprising the particles, wherein the liquids are ejected from respective nozzles to be brought into contact with each other and then to flow in an integrated manner while forming a spiral flow.

Abstract: A liquid ejection head according to the present invention includes a plurality of ejection openings arranged in a first direction and a plurality of electro-thermal transducers for ejecting liquid from the ejection openings, the liquid ejection head and a printing medium being subjected to the relative movement, wherein an arrangement pitch of the ejection openings forming an end group located in the respective opposite end section along the first direction is longer than an arrangement pitch of the ejection openings forming a central group located in the central section along the first direction. According to the present invention, it is possible to eliminate white streaks which may generate in a solid printing.

Abstract: To provide an inkjet recording apparatus capable of preventing nozzle clogging, capable of aligning the nozzle positions of line heads precisely and easily, and capable of adjusting the number of the line heads. The present invention is an inkjet recording apparatus 10 including a first plate 20a having a plurality of line heads 11a aligned thereon, a coupling portion 21 jointed to the first plate 20a, a drive device 30 sliding the first plate 20a via the coupling portion 21 from a waiting position P1 in which the line heads wait to a recording position P2 in which recording is performed on a recording medium 1, and a second plate 20b having at least one line head 11b thereon and being attachable to and detachable from the coupling portion 21, wherein only the first plate 20a is slidable when the second plate 20b is detached from the coupling portion 21, and the first plate 20a and the second plate 20b are integrally slidable when the second plate 20b is attached to the coupling portion 21.

Abstract: A method for forming an ink jet printhead subassembly can include the use of a sacrificial form to fabricate a printhead subassembly having a plurality of ink channels therethrough. The sacrificial form can be manufactured using one or more described techniques. The completed printhead subassembly can include a single solid structure manufactured from a single material, or can include more than one solid structures assembled together. A printhead subassembly according to the present teachings can have a reduced number of parts and cost, simplified manufacture, and increased yields and lifetime compared to some other printhead subassemblies.

Abstract: An inkjet ink set containing a first pigment ink and a second pigment ink. The first pigment ink includes an anionic self-emulsification ether polyurethane, and the second pigment ink includes a styrene acrylic resin emulsion.

Abstract: According to one embodiment, an inkjet head includes a nozzle plate, a base member, a frame-like member, an ink chamber, a supply channel and a discharge channel. The nozzle plate includes nozzles. The base member includes driving elements that cause the ink to be ejected from the nozzles, and is opposed to the nozzle plate. The frame-like member is interposed between the nozzle plate and the base member and includes first opening parts and a second opening part extending over all the first opening parts. The ink chamber is provided inside the frame-like member and communicates with the ink chamber. The supply channel is provided in the base member and communicates with the ink chamber to supply ink. The discharge channel is provided in the base member, communicates with the ink chamber to discharge ink, and is connected to the first opening parts through the second opening parts.

Abstract: A sub-carriage includes a first head mounting portion and a second head mounting portion. The second head mounting portion includes at least a portion of constitution members of an adjustment mechanism which adjusts a position of the second head, a first recording head of one side of the same set is fixed in a state of being positioned to the first head mounting portion so that the nozzles are disposed in a defined position, and a second recording head of the other side is fixed to the second head mounting portion in a state where the relative position to the first recording head is defined by the adjustment mechanism based on a landing position in a recording medium of ink ejected from predetermined nozzles of the second recording head with respect to a landing position in a recording medium of ink ejected from predetermined nozzles of the first head.

Abstract: A structure for an inkjet printhead is disclosed. The printhead structure has an elongate support structure for supporting a printhead integrated circuit, and ink conduits formed in the elongate support structure for supplying ink to an array of nozzles of the printhead integrated circuit. Each ink conduit includes cavities distributed along a roof of the ink conduit. An opening to each cavity has an upstream edge and a downstream edge. The upstream edge contacts the ink before the downstream edge during initial priming of the ink conduits from an ink supply. The upstream edge has a transition face between the ink conduit and the cavity interior, the transition face being configured to inhibit ink from filling the cavity by capillary action during initial priming of the ink conduit. This causes gas to be trapped within the cavity. The gas acts to compress pressure pulses in the ink.

Abstract: A micro-fluid ejection head for a printer is disclosed. The micro-fluid ejection head comprises a plurality of printhead modules. Each of the plurality of printhead modules comprises an ejection chip for ejecting fluid. The micro-fluid ejection head further comprises a support frame to mount the plurality of printhead modules for creating a lengthy array of the plurality of printhead modules. The support frame is electrically coupled with the plurality of printhead modules for allowing the plurality of printhead modules to receive data and electrical power.

Abstract: An ink-jet recording apparatus includes a recording head which jets inks, and a cable which is connected to the recording head and which is provided with a driving circuit for applying a driving voltage of the recording head. The recording head is formed with nozzle arrays for jetting an ink of a dark color and an ink of a light color respectively. The nozzle array, which jets the ink of the dark color, is disposed farther from the driving circuit than the nozzle array which jets the ink of the light color. The nozzle array, which jets the ink of the dark color, is hardly affected by the heat from the driving circuit. Therefore, the deterioration of the recording quality, which would be otherwise caused by the disturbance of ink discharge from nozzles, is suppressed.

Abstract: A liquid ejecting head unit includes a liquid ejecting head having a nozzle forming surface provided with nozzle rows consisting of several rows of nozzles for ejecting liquid; and a head fixing member to which the liquid ejecting head is fixed with an intermediate member therebetween. The liquid ejecting head has an intermediate-member fixing portion to which the intermediate member is fixed. The intermediate member has a head-fixing-member bonding surface to be securely bonded to an intermediate-member bonding surface of the head fixing member with adhesive. The head-fixing-member bonding surface has a chamfered portion along at least a portion of an outer edge thereof, the chamfered portion being provided such that the distance from the intermediate-member bonding surface gradually increases from the inner side toward the outer side of the head-fixing-member bonding surface.

Abstract: According to one feature of the present invention, a method of manufacturing a porous catcher includes providing a catcher face material layer; forming pores in the catcher face material layer using a first etching process that is controlled by a first photolithographic mask; providing a reinforcing structure material layer that is in mechanical contact with the porous catcher face; forming openings in the reinforcing structure material layer using a second etching process that is controlled by a second photolithographic mask; and fluidically connecting the openings in the reinforcing structure and the pores of the catcher face using a material removal process.

Abstract: A method for printing an image, the method includes the steps of defining a media support surface; advancing a print medium onto the support surface; emitting light from a first side of the print medium toward the defined surface; moving a sensor on a second side of the print medium along a scan direction; monitoring the position of the sensor as it moves along the scan direction; sensing the light on the second side of the print medium which is opposite the first side as the light passes through the print medium to a sensor; providing memory for storing patterns representing particular media types; providing a processor for comparing signals from the sensor to patterns stored in the memory in order to identify media type; identifying the print medium type; selecting a print mode based on the identified print medium type; processing an image according to the selected print mode; and printing the image on the print medium.

Abstract: Disclosed is a liquid ejecting head, including two nozzle sequences, each nozzle sequence including nozzles for ejecting a liquid drop, separate liquid chambers communicating with the nozzles, and two common liquid chambers for supplying a liquid to the separate liquid chambers and correspond to the two nozzle sequences, each common liquid chamber including a supply port for supplying a liquid thereto, an aperture, a cross-section thereof in a second direction orthogonal to a first direction of arrangement of the plural nozzles decreasing toward an end portion thereof in the first direction, wherein the supply port and aperture of one of the two common liquid chambers are provided at one end portion and the other end portion in the first direction, respectively, and the supply port and aperture of another one are provided at the other end portion and the one end portion in the first direction, respectively.

Abstract: An ink-jet head includes: a first nozzle group; a second nozzle group; a first common ink chamber; and a second common ink chamber. With respect to a first direction, nozzles constituting the first nozzle group and nozzles constituting the second nozzle group are arranged alternately to complement each other, the first nozzle group includes a first nozzle and a second nozzle which deviates from the first nozzle with respect to a second direction perpendicular to the first direction, the second nozzle group includes a third nozzle arranged adjacent to the first nozzle with respect to the first direction and a fourth nozzle arranged adjacent to the second nozzle with respect to the first direction, and with respect to the second direction, the fourth nozzle deviates from the third nozzle in a direction opposite to a direction in which the second nozzle deviates from the first nozzle.

Abstract: A method for forming an image includes providing a media support adapted to receive media; providing a recording head comprising a plurality of recording channels, wherein each recording channel is adapted to form an image pixel column while scanning over the media; providing an image data file comprising one or more arrangements of image data columns; assigning first image data from a single image data column to a first recording channel of the recording head; operating the first recording channel to form a first image pixel column solely in accordance with the assigned first image data; assigning second image data from each image data column of a plurality of the image data columns to a second recording channel of the recording head; operating the second recording channel to form a second image pixel column in accordance with the assigned second image data; and operating the recording head to form the image.

Abstract: A liquid droplet ejecting head is disclosed which includes at least one or more nozzles which eject liquid droplets; one or more dedicated liquid chambers which are communicatively connected to the nozzle; a common liquid chamber which is communicatively connected to the dedicated liquid chamber; and an energy generating unit which generates energy provided to the dedicated liquid chamber, wherein at least one wall face of the common liquid chamber includes a flexible wall, which has flexibility; a buffer chamber is included in an opposing area via the flexible wall and the common liquid chamber; and wherein the buffer chamber is communicatively connected to an external space in an area not opposing the common liquid chamber.

Abstract: A liquid ejection head includes: a first and a second common liquid chamber formed in a substrate; a first nozzle array in which short and long nozzles are connected to the first common liquid chamber and alternately arranged on one side of the chamber; a second nozzle array in which short and long nozzles are connected to the first common liquid chamber and alternately arranged on the other side; a third nozzle array in which short and long nozzles are connected to the second common liquid chamber and alternately arranged on one side of the chamber; and a fourth nozzle array in which short and long nozzles are connected to the second common liquid chamber and alternately arranged on the other side; wherein the long and short nozzles formed on the one side and the long and short nozzles formed on the other side are disposed within a pitch P.

Abstract: A circuit apparatus includes an output circuit that outputs a signal to a host apparatus via a bus, and an output control circuit that controls the output circuit. The output circuit has a first conductive transistor provided between an output node and a first power source node, and a second conductive transistor provided between the output node and a second power source node. In a first output mode, the output control circuit controls one of the first conductive transistor and the second conductive transistor to go to off and controls the other transistor to go to on/off, whereas in a second output mode, the output control circuit controls the first conductive transistor to go to on and the second conductive transistor to go to off or vice versa.

Abstract: A method for fabricating a fluid nozzle array includes forming a circuitry layer onto a substrate, the substrate comprising a stopping layer disposed between a membrane layer and a handle layer, forming a fluid feedhole extending from a surface of the membrane layer to the stopping layer, and forming a fluid supply trench extending from a surface of the handle layer to the stopping layer. A fluid nozzle array includes a substrate including a membrane layer, a stopping layer adjacent to the membrane layer, a handle layer adjacent to the stopping layer, and a set of fluid chambers disposed on a surface of the membrane layer above and along a width of a fluid supply trench extending from a surface of the handle layer to the stopping layer.

Abstract: A liquid ejection head, including a plurality of pressure chambers respectively communicating with a plurality of ejection orifices for ejecting a liquid, for storing the liquid to be ejected from the plurality of ejection orifices, at least a part of a wall portion forming each of the plurality of pressure chambers being formed of a piezoelectric member, the plurality of pressure chambers causing the plurality of ejection orifices to eject the liquid by deformation of the piezoelectric member; and a plurality of space portions arranged in parallel to the plurality of pressure chambers at intervals with respect to the plurality of pressure chambers, some of the plurality of space portions being decompressable, wherein a gas permeable member is provided between the pressure chambers and the decompressable space portions so that a gas inside the pressure chambers is exhausted via the decompressable space portions.

Abstract: According to an aspect of the present invention, the function expressing the relationship between the temporary recording element number and the line positions for each line block is obtained, and adequacy of the temporary recording element number is determined based on consistency between the line blocks having the characteristics expressed by the functions. For the line blocks that have different characteristics from the rest of the line blocks, it is determined that the temporary recording element numbers of such line blocks have errors, and these temporary recording element numbers are corrected. Thus, the correspondence relation between each recording element number and each line position can be defined so that the characteristics of the line blocks become consistent with one another.

Abstract: An image forming apparatus includes plural heads each having a nozzle configured to discharge a droplet of a recording fluid; a distributing member to which the plural heads are attached, the distributing member having an inlet portion, a supply channel portion, and a common fluid chamber communicated with the inlet portion and configured to supply the recording fluid to the plural heads; and a fluid containing unit configured to supply the recording fluid to the distributing member via the inlet portion and the supply channel portion. The distributing member includes a flow-directing wall disposed between the supply channel portion and the common fluid chamber.

Abstract: A recording head includes flange portions to which spacers are anchored on both sides of the recording head with a head case therebetween. Spacer attachment holes are provided in the flange portions in the center of the width direction orthogonal to a nozzle row in the recording head, and a round hole and an oblong hole relative to the spacers are provided in the flange portions in positions that are distanced from a center line in the width direction. Positioning holes for the flange portions are provided in the spacers in positions that correspond to the round hole and the oblong hole in the flange portions, and the spacers are anchored to the flange portions on both sides so as to be oriented symmetrically to each other, in a positioned state in which the positions of the positioning holes are aligned with the round hole and the oblong hole.

Abstract: A flexible circuit substrate has an integrated circuit mounted on the substrate, a first set of traces arranged to connect between a first voltage source and a first set of connectors on the integrated circuit, a second set of traces arranged to connect between a second voltage source and a second set of connectors on the integrated circuit, and a gap in the flexible circuit substrate between the first and second set of traces, the gap of sufficient width to stop an electrical arc-tracking between the first set of traces and the second set of traces. The substrate may have a second gap between the first gap and other traces.

Abstract: There is provided a method of printing a regular array of rows of subpixels on a workpiece. The subpixels have c different colors and have a subpixel pitch s. A printing head has z nozzles arranged in a row with a spacing p, where z=n1(c) and p=(c?1)(s), the printhead being at a first position relative to the workpiece. There are c different printing inks, one for each of the c colors, and each of the printing inks is supplied to the nozzles in a regular alternating pattern. The method includes steps of printing a first set of z rows of subpixels with the printing head; moving the workpiece laterally relative to the printing head by a distance d1, where d1=z(s); printing a second set of z rows of subpixels with the printing head; repeating the printing steps n2 times for a total of n2+2 sets of z rows of subpixels. Variables include: c, an integer greater than 1; n1, an integer greater than 0, with the proviso that when c is an odd number, then n1 is an odd number; and n2, an integer greater than 0.

Abstract: A printhead includes a chamber layer and at least two orifice layers. A first orifice layer is disposed on the chamber layer, and a second orifice layer is disposed on the first orifice layer. The second orifice layer has at least one counterbore formed therein. A first nozzle is formed through both orifice layers and produces droplets of a first drop weight. A second nozzle is formed through the first orifice layer, coincident with the counterbore, and produces droplets of a second drop weight that is different than the first drop weight. In one embodiment, the printhead is used in a stand-alone fluid-dispensing device.

Abstract: An image data signal value conversion is performed such that the volume of ink applied to image areas on a print medium to be printed by the overlapping portions of the printing element substrates is smaller than that applied to image areas on the print medium to be printed by portions other than the overlapping portions. Alternatively, the image data signal value conversion is performed such that the volume of ink applied to overlapping areas on the print medium to be printed by two consecutive printing main scans is smaller than that applied to areas other than the overlapping areas. For this reason, even when forming photographic images by using an elongate “joining head”, high-quality images with no density unevenness between overlapping areas and other areas on a print medium can be produced. Also in a serial type printing apparatus, uniform images with no seam stripes can be produced.

Abstract: An image processing apparatus is provided. A density conversion component converts a density of a transparent color material so that a total amount of a plurality of color materials is smaller than a predetermined first amount when it is determined that the total amount of the plurality of color materials is larger than the predetermined first amount and when the transparent color material is included in the plurality of color materials. A density ratio calculation component calculates a ratio between a density before converting the density of the transparent color material and a density after converting the density of the transparent material. A reporting component reports that the ratio of the density is smaller than a predetermined second amount when determining that the ratio of the density is smaller than the predetermined second amount.

Abstract: There is provided a liquid ejecting apparatus including: a main tank, a sub tank, a liquid ejecting head, a first supply channel member, a second supply channel member, and a pump device. The first liquid supply channel includes an upstream-side supply channel, and a downstream-side supply channel The pump device includes a first chamber, a second chamber, and a transfer-force applying section. The first chamber inlet is connected to a downstream-side end portion of the upstream-side supply channel. The first chamber outlet and the second chamber inlet are connected to the transfer-force applying section. The second chamber outlet is connected to the downstream-side supply channel. The first chamber outlet is provided to an upper-end portion of the first chamber. The second chamber outlet is provided to an upper-end portion of the second chamber.

Abstract: An image forming apparatus includes a common array base member; and plural head modules each formed of a module base member and plural heads configured to discharge droplets arranged in an array on the module base member. The plural head modules are attached on the common array base member. The heads of at least two of the head modules discharge liquid droplets of the same color. The at least two of the head modules are positioned relative to a same reference point provided by a reference member on the common array base member.

Abstract: The present invention relates to a fluid ejection assembly that includes an injection-molded mounting substrate that is formed by a two-shot injection molding process, wherein a housing portion of the mounting substrate is formed by a first shot molding, and a die-attach portion of the mounting substrate is formed within the housing portion by a second shot molding.

Abstract: A method of printing an image comprises sending a data stream representing the image to a printer driver, generating a stream of print instructions at the printer driver, forwarding the stream of print instructions to a printer, and printing the image in accordance with the print instructions. The data stream or stream of print instructions is intercepted and processed so that the printer uses less ink to print the image than it would if the processing was not performed.

Abstract: A printhead assembly includes an ink manifold having a plurality of ink outlets defined in a manifold bonding surface; one or more printhead integrated circuits, each printhead integrated circuit having a plurality of ink inlets defined in a printhead bonding surface; and an adhesive film sandwiched between said manifold bonding surface and said one or more printhead bonding surfaces, said film having a plurality of ink supply holes defined therein, each ink supply hole being aligned with an ink outlet and an ink inlet. The adhesive film is a laminated film comprising a central polymeric film sandwiched between a first adhesive layer and a second adhesive layer, the first adhesive layer has a melt temperature lower than that of the second adhesive layer.

Abstract: A printing method etc. capable of suppressing degradation in image quality of border sections between regions respectively printed by a plurality of nozzle rows that eject ink droplets is achieved.

Abstract: This aims to provide an inkjet recording apparatus which prevents a beading or a color bleeding in a recording system using a line head, and an inkjet recording method. The inkjet recording apparatus comprises an ink line head equipped with nozzle rows having a plurality of nozzles arranged at a predetermined pitch for discharging inks containing coloring materials, and a fixing liquid line head equipped with nozzle rows having a plurality of nozzles arranged at a predetermined pitch for discharging fixing liquids to enhance the fixtures of the inks to a recording medium. The inkjet recording apparatus performs the records by discharging the inks and the fixing liquids from the individual line heads to the recording medium while moving the recording medium and the individual line heads relatively in predetermined directions.

Abstract: A printing apparatus includes a line head which includes first and second basic heads each having a plurality of nozzles in a predetermined direction and in which the first and second basic heads are arranged in the predetermined direction so as to form an overlapping section in the predetermined direction and a controller which controls the first and second basic heads when at least one of a print medium and the line head moves in a direction intersecting the predetermined direction and which controls the first and second basic heads so as to print the contour of a character or a line image by using only one of the first and second basic heads when the character or the line image is contained in an image printable by the overlapping section.

Abstract: One of the two flow passages branches from one of two ink cartridges to one of the two discharging portions and one of the two individual discharging portions. The other flow passage branches from the other ink cartridge to the other discharging portion and the other individual discharging portion. A ratio of frequency of use of each of the discharging portions, Ra, and frequency of use of each of the individual discharging portions, Rb, satisfies Ra:Rb=1:1/2.

Abstract: A plurality of liquid ejection heads is attached to a head attachment member with respect to a support drum for supporting an ejection-receiving medium and rotating about a rotation shaft. The head attachment member includes a plurality of attachment surfaces to which a plurality of head groups each including a plurality of liquid ejection heads is attached. Each of the attachment surfaces is arranged so as to be parallel to a tangent line which is tangent to a peripheral surface of the support drum at an intersection point of a line segment which connects the center of the support drum and the center on the first attachment surface between the head groups attached to the first attachment surface. The attachment surfaces are integrally and continuously formed.

Abstract: A micro-fluid ejection head conveys fluid to firing elements at differing heights in differing layers. The ejection head includes a base substrate. The firing elements are configured on the substrate to eject fluid upon activation. Individual elements are arrayed closer or farther to a common fluid via. A multiple-layer covering on the substrate defines nozzles openings corresponding to each firing element. A lower layer of the covering directs fluid to either the closer or farther elements while a higher layer directs fluid to the other elements. The lower and higher layers define channels to direct the fluid from the fluid via. The higher layer covers the channels in the lower layer, while a topmost layer covers the channels in the higher layer. Also, the topmost layer defines the nozzle openings in large and small opening sizes. Holes in the underlying layers register with the nozzle openings, but are oppositely sized.