Abstract: A liquid ejection head includes a supply manifold, a plurality of supply throttle channels, a plurality of pressure chambers, and a plurality of nozzles. The supply manifold includes a supply opening through which liquid is supplied from an exterior. The supply manifold extends in a first direction. Each of the supply throttle channels is connected, at one end thereof, to the supply manifold, and extends in a second direction. Each of the pressure chambers is connected to the other end of a corresponding one of the supply throttle channels, and extends in a third direction different from the first direction. Each of the nozzles communicates with a corresponding one of the pressure chambers. The second direction in which each of the supply throttle channels extends has a component of the first direction and a component of the third direction.

Abstract: A liquid discharge head, includes an individual channel, and first and second common channels. The individual channel includes: a nozzle; a pressure chamber; a connection channel; a first communication channel; and a second communication channel. A first vector is defined such that a starting point and ending point are located on the connection channel, and a second vector is defined such that a starting point and an ending point are located on the second communication channel. A first angle formed by a projection vector of the first vector onto the first plane and a projection vector of the second vector onto the first plane is less than 90°. A second angle formed by a projection vector of the first vector onto the second plane and the second vector is less than 90°.

Abstract: A head module includes first individual channels each including a first nozzle orifice; a first supply manifold being in fluid communication with the first individual channels and configured to allow liquid to flow into the first individual channels therefrom; a first return manifold being in fluid communication with the first individual channels and configured to allow liquid not ejected from the first nozzle orifices to flow thereinto; second individual channels each including a second nozzle orifice; a second supply manifold being in fluid communication with the second individual channels and configured to allow liquid to flow into the second individual channels therefrom; a second return manifold being in fluid communication with the second individual channels and configured to allow liquid not ejected from the second nozzle orifices to flow thereinto; and a first bypass path providing fluid communication between the first supply manifold and the second return manifold.

Abstract: There is provided a liquid discharge apparatus configured to discharge a liquid, including a channel member for the liquid. The channel member is formed to include: a pressure chamber configured to contain the liquid; a nozzle configured to discharge the liquid; a connection channel connecting the pressure chamber and the nozzle; and a discharge channel which is connected to the connection channel so as to discharge the liquid in the connection channel or connected to the pressure chamber so as to discharge the liquid in the pressure chamber. An intersection line between an orthogonal plane orthogonal to an extending direction of the discharge channel and an upper surface of the discharge channel defining an upper portion of the discharge channel has an arc-like shape protruding upwardly.

Abstract: A liquid ejection apparatus includes a supply manifold, a return manifold, and a plurality of individual channels. The supply manifold and the return manifold are elongate and vertically overlap each other, and liquid flows therein. Each individual channel connects the supply manifold and the return manifold and includes a supply throttle connected, at a supply-manifold-side opening thereof, to the supply manifold, a return throttle connected, at a return-manifold-side opening thereof, to the return manifold, a nozzle from which liquid is ejected, and a descender connecting the supply throttle and the return throttle, and connected to the nozzle. The supply-manifold-side opening of the supply throttle is positioned to vertically overlap a central area of the supply manifold in a width direction, and the return-manifold-side opening of the return throttle is positioned to vertically overlap a central area of the return manifold in the width direction.

Abstract: A liquid discharge head includes an individual channel which includes: a nozzle; a pressure chamber; a descender of which one end in the first direction is nearer to the nozzle than the other end; and a second connecting channel connecting a second common channel and the one end of the descender. A central axis of the nozzle is positioned between the second common channel and a central axis of the descender in the second direction. The descender includes a first portion including the one end and a second portion positioned between the pressure chamber and the first portion in the first direction. In an end, of the descender, opposite to the second connecting channel in the second direction, an inner wall defining the one end of the first portion protrudes toward the second connecting channel in the second direction beyond an inner wall defining the second portion.

Abstract: A head module includes a pressure chamber, a piezoelectric member, a supply manifold, a return manifold, and a damper portion. The pressure chamber is configured to hold liquid therein and in fluid communication with a nozzle orifice. The piezoelectric member is configured to apply pressure to liquid held in the pressure chamber. The supply manifold is in fluid communication with the pressure chamber and configured to allow liquid to flow into the pressure chamber therefrom. The return manifold is in fluid communication with the pressure chamber and configured to allow liquid not ejected from the nozzle orifice to flow thereinto. The damper portion is positioned between the supply manifold and the return manifold when viewed in plan from a nozzle surface of the head module. The nozzle surface has the nozzle orifice defined therein. The damper portion includes a particular plate having a particular recessed portion.

Abstract: A liquid ejection head includes a stack structure including plates stacked and bonded with an adhesive agent, individual channels formed in the stack structure, dummy channels formed in the stack structure separately from the individual channels, and a first relief groove formed in the stack structure separately from the individual channels and configured to trap therein an excessive adhesive agent. Each individual channel includes a pressure chamber to which pressure is applied for liquid ejection form a nozzle, a supply throttle channel connected to the pressure chamber, and a return throttle channel communicating with the pressure chamber. The supply throttle channel and the return throttle channel each have a smaller cross-sectional area than the pressure chamber. The dummy channels include dummy chambers arranged laterally to an array of the pressure chambers arranged in an array direction. The first relief groove is connected to the dummy channels.

Abstract: There is provided a head unit including: head modules; a plurality of first tubes; and a plurality of second tubes. Each of the head modules includes: energy-applying mechanisms; supply buffer chambers; and return buffer chambers. The supply buffer chambers of the plurality of head module are connected in series via the plurality of first tubes. The return buffer chambers of the plurality of head modules are connected in series via the plurality of second tubes.

Abstract: There is provided a head unit including: at least two head modules, and at least one head module. The head unit further includes: a tank; a first and second tubes; and a joint unit including at least one first joint which includes a first port connected to the first tube and a second port connected to the second tube, and which relays the first tube and the second tube to each other. The first port of the at least one first joint extends in one side in a third direction orthogonal to the first direction and the second direction.

Abstract: There is provided a head module including: a liquid discharging head; a driver IC; a heat sink; and a fan. The head module includes: a channel unit; and an energy-applying mechanism. The heat sink includes: a base part; and a plurality of fins including: a first fin, a second fin, and a third fin. A plane direction of a plane in which the first fin expands crosses a plane direction of a plane in which the second fin expands, and crosses a plane direction of a plane in which the third fin expands. The fan is arranged at a position at which the fan overlaps with the base part in the first direction, and in a space surrounded by the first fin, the second fin, the third fin and the base part.

Abstract: There is provided a liquid discharge head including: first and second common channels extending in a first direction; and a plurality of individual channels each including: a supplying part, a descender part, and a returning part. The returning part includes: a throttle part and a wide part. Each of a plurality of nozzles is located at a position at which each of the plurality of nozzles overlaps with the wide part in a second direction. At a throttle-starting position which is a boundary between the throttle part and the wide part, a length in the second direction of the throttle part and a length in the second direction of the wide part are same.

Abstract: A liquid discharging apparatus includes: a nozzle surface having a nozzle; a pressure chamber communicating with the nozzle and configured to store liquid; a piezoelectric body configured to apply pressure to the liquid inside the pressure chamber; a supply manifold configured to supply the liquid to the pressure chamber; a return manifold arranged to overlap with the supply manifold and configured to allow the liquid, which is not discharged from the nozzle, to flow therethrough; a pair of elastically deformable portions provided between the supply manifold and the return manifold; a damper space formed between the elastically deformable portions; and a shielding plate configured to separate the damper space into a first damper space and a second damper space, wherein Young's modulus of the shielding plate is greater than Young's modulus of each of the elastically deformable portions.

Abstract: A liquid discharging head includes: a pressure chamber; a descender extending from the pressure chamber in a first direction; a communicating channel extending from the descender in a second direction crossing the first direction; a first return channel and a second return channel connecting the communicating channel and a return manifold; and a nozzle connected to the communicating channel. The first return channel and the second return channel are connected, with respect to the communicating channel, at facing positions, respectively, the facing positions facing each other in a direction orthogonal to the second direction; and the nozzle is provided, in the communicating channel, at a position which is offset from an axis of the descender, and which is sandwiched between a connecting location of the first return channel with respect the communicating channel and a connecting location of the second return channel with respect to the communicating channel.

Abstract: There is provided a liquid discharge head including a channel unit that includes plates stacked on top of each other in a first direction and is formed having individual channels, a first common channel, and a second common channel. The first and second common channels communicate with the individual channels. Each individual channel includes a nozzle, a pressure chamber, a descender, a first throttle channel, and a second throttle channel. The plates include a nozzle plate, a pressure chamber plate, and a first plate formed having a first through hole that constitutes part of the descender. A center portion of the nozzle is positioned at a side opposite to the second throttle channel in the second direction with respect to a center portion of the descender.

Abstract: A liquid ejection head, including: a first head unit; a second head unit shifted with respect to the first head unit in both of a first direction in which nozzles of the head units are arranged and a second direction orthogonal to the first direction and disposed so as to overlap the first head unit in the second direction; and a first wiring member having flexibility and drawn from the second head unit in the second direction toward the first head unit, wherein the first wiring member includes a large-width portion on which a drive circuit is mounted and a small-width portion having a width in the first direction smaller than a width of the large-width portion in the first direction, and wherein the small-width portion passes through a space existing next to the first head unit in the first direction and extends in the second direction.

Abstract: A liquid ejection head, including: a first head unit; a second head unit shifted with respect to the first head unit in both of a first direction in which nozzles of the head units are arranged and a second direction orthogonal to the first direction and disposed so as to overlap the first head unit in the second direction; and a first wiring member having flexibility and drawn from the second head unit in the second direction toward the first head unit, wherein the first wiring member includes a large-width portion on which a drive circuit is mounted and a small-width portion having a width in the first direction smaller than a width of the large-width portion in the first direction, and wherein the small-width portion passes through a space existing next to the first head unit in the first direction and extends in the second direction.

Abstract: A liquid ejection head includes: head units arranged in a first direction; first individual heat dissipators each corresponding to one of the head units and disposed on a first side of the head unit in a second direction; and a first common heat dissipator disposed on the first side of the head units in the second direction. The first common heat dissipator extends in the first direction and shared among the head units. Each head unit includes: a unit body including an actuator; and a first driver integrated circuit disposed on the first side of the unit body in the second direction. Each of the first individual heat dissipators is disposed between the first driver integrated circuit and the first common heat dissipator of the head unit so as to be in thermal contact with the first driver integrated circuit and the first common heat dissipator.

Abstract: A liquid jetting apparatus jetting a liquid onto a recording medium conveyed in a first direction includes head units arranged in a second direction orthogonal to the first direction. One head unit includes nozzle chips; one nozzle chip has a nozzle arrangement area wherein nozzles are aligned in a third direction crossing the first and second directions. The nozzle chip is arranged to be shifted relative to another nozzle chip in a direction crossing the first and second directions and different from the third direction. The head unit has a first overlapping portion wherein nozzle arrangement areas of first and second nozzle chips included in the nozzle chips partially overlap with each other in the first direction. The liquid jetting apparatus has a second overlapping portion wherein nozzle arrangement areas of third and fourth nozzle chips included in the head units partially overlap with each other in the first direction.

Abstract: A liquid discharge head includes: an individual channel having an inlet and an outlet, the individual channel including: a nozzle, an upstream-side pressure chamber arranged between the inlet and the nozzle, a downstream-side pressure chamber arranged between the outlet and the nozzle, an upstream-side throttle channel connecting the inlet and the upstream-side pressure chamber, and a downstream-side throttle channel connecting the outlet and the downstream-side pressure chamber; a supply channel connected to the inlet and configured to supply liquid to the individual channel; a recovery channel connected to the outlet and configured to recover the liquid from the individual channel; an upstream-side actuator configured to apply pressure to the liquid inside the upstream-side pressure chamber; and a downstream-side actuator configured to apply the pressure to the liquid inside the downstream-side pressure chamber.