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 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 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.

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 discharge head includes: first and second common channels extending in a first direction; and individual channels including pressure chambers and nozzles. Each of the individual channels includes: a supply portion; a descender portion extending in a second direction; and a return portion extending in a third direction. The return portion includes: a throttle portion; and a wide portion. Each of the nozzles overlaps with the wide portion. A relationship of L2>L1 is satisfied, wherein L1 is a distance in the third direction from a center of each of the nozzles to a throttle starting position, and L2 is a distance in the third direction passing through a center in a cross section of the descender portion and ranging from a center line parallel to the second direction to the center of each of the nozzles.

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 apparatus includes: an ejection module; a supply chamber connected to the ejection module and to a tank configured to store liquid; and a damper chamber connected to the supply chamber. The supply chamber has: a first opening communicating with the damper chamber; and a second opening communicating with the tank.

Abstract: A liquid discharge head includes an individual channel, a supply channel in communication with an inlet of the individual channel, and a return channel in communication with an outlet of the individual channel. The supply channel extends in a channel longitudinal direction, and communicates with a retaining chamber for retaining liquid via a supply port provided at one side with respect to the individual channel in the channel longitudinal direction. The return channel extends in the channel longitudinal direction, and communicates with the retaining chamber via a return port provided at the one side with respect to the individual channel in the channel longitudinal direction. The inlet and the outlet are located at the same position in the channel longitudinal direction.

Abstract: A liquid discharge head includes: individual channels; a supply channel connected to inlets of the individual channels and through which liquid is supplied to the individual channels; and a recovery channel connected to outlets of the induvial channels and through which the liquid is recovered from the individual channels. Each of the induvial channels includes: a nozzle; an upstream-side pressure chamber disposed between the nozzle and the supply channel; a downstream-side pressure chamber disposed between the nozzle and the recovery channel; an upstream-side throttle channel connecting the supply channel and the upstream-side pressure chamber; and a downstream-side throttle channel connecting the recovery channel and the downstream-side pressure chamber. A channel resistance of the upstream-side throttle channel is smaller than a channel resistance of the downstream-side throttle channel.

Abstract: A liquid ejection head includes a nozzle, a pressure chamber configured to receive a pressure to eject liquid from the nozzle, a descender, and a communication channel. The descender has a first end and a second end opposite to each other. The first end is connected to the pressure chamber. The communication channel is connected to the second end and extends from a connection with the second end in an X direction. A first direction in which the descender extends from the second end toward the first end is inclined toward the communication channel relative to a Y direction orthogonal to the X direction.

Abstract: There is provided a liquid discharge head including a channel member and a temperature sensor. The channel member includes: a plurality of individual channels aligned in a first direction; a first common channel extending in the first direction and communicating with the plurality of individual channels; a second common channel extending in the first direction, communicating with the plurality of individual channels and arranged side by side to the first common channel in a second direction crossing the first direction; and a connecting channel extending in the second direction and connecting an end in the first direction of the first common channel and an end in the first direction of the second common channel. The temperature sensor overlaps with the connecting channel in the second direction.