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 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 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 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: There is provided a liquid discharge head including a channel unit including: individual channels aligned in a first direction, and first and second common channels extending in the first direction. Each of the individual channels includes: a nozzle, a pressure chamber, first and second communicating channels. The channel unit further includes a linking channel linking two pieces of the second communicating channel to each other.

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.

Abstract: A liquid discharging head includes: individual channels aligned in a first direction; and a first common channel and a second common channel extending in the first direction. Each of the individual channels includes a nozzle, a first pressure chamber and second pressure chamber arranged side by side in the first direction, and a connecting channel connecting the nozzle, the first pressure chamber and the second pressure chamber to one another. A first actuator and a second actuator are provided on the first pressure chamber and the second pressure chamber, respectively.

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: A liquid discharge head includes: individual channels arranged in a first direction; and first and second common channels each extending in the first direction. An opening of the first common channel and an opening of the second common channel are arranged at the same side with respect to the individual channels in the first direction. Each of the individual channels includes: a first communicating channel and a second communicating channel communicating with the first common channel, and a third communicating channel communicating with the second common channel.

Abstract: A liquid discharging head includes: a first member having a surface in which first openings are formed, the first openings arranged in a first direction and communicating with individual channels; a second member disposed at one side in a second direction with respect to the first member, the second member having: a space extending in the first direction and communicating with the first openings; and a second opening disposed at the first side in the second direction with respect to the space and communicating with the space; and a third member disposed between the first member and the second member in the second direction and having a communicating hole extending in the first direction and allowing the first openings to communicate with the space. The third member has a wall dividing the communicating hole into partial holes separated from each other in the first direction.

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: A liquid ejection head includes a supply manifold, a return manifold, and individual channels each connected, at its upstream end, to the supply manifold and, at its downstream end, to the return manifold. Each of the individual channels communicates with a corresponding one of nozzles arranged in an array on a nozzle surface. The supply manifold and the return manifold extend in an extending direction along the nozzle array. The return manifold includes a lower portion located below the supply manifold to overlap the supply manifold in plan view orthogonal to the nozzle surface, and a standing portion located at at least one of opposite ends of the lower portion in the extending direction to be outside the supply manifold in plan view. The standing portion has a height to cover at least a portion of an end of the supply manifold when viewed in the extending direction.

Abstract: A liquid jetting apparatus includes a nozzle plate having a nozzle, and a channel unit having a first surface facing and joined with the nozzle plate. The channel unit has a first channel member having the first surface, and a second channel member having a second surface facing and joined with the first channel member. The second channel member is formed with a first pressure chamber, a second pressure chamber, a first opening and a second opening defined by the second surface, a first connecting channel connecting the first pressure chamber and the first opening, and a second connecting channel connecting the second pressure chamber and the second opening. The first channel member is formed with a third connecting channel connecting the first pressure chamber and the second pressure chamber.

Abstract: A liquid ejection head includes a supply manifold, a return manifold, a plurality of individual channels, and a connecting throttle channel. The supply manifold includes a supply port through which liquid is supplied from an exterior. The return manifold includes a return port through which liquid is discharged to the exterior. Each individual channel is connected, at an upstream end thereof, to the supply manifold and, at a downstream end thereof, to the return manifold. Each individual channel communicates with a corresponding one of nozzles and includes an individual throttle channel. Through the connecting throttle channel, adjacent ones of the individual throttle channels communicate with each other. The connecting throttle channel has a channel resistance less than or equal to a channel resistance of each individual throttle channel.

Abstract: A liquid ejection head includes: a first head unit; a second head unit disposed adjacent to the first head unit in a first direction and located on a first side of the first head unit in a second direction; and a heat uniforming unit shared by the first head unit and the second head unit. Each of the first head unit and the second 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. The heat uniforming unit includes a first heat uniforming member disposed on the first side of the first head unit and the second head unit in the second direction. The first heat uniforming member includes a first protrusion located next to the second head unit in the first direction and protruding toward the first head unit.

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 jetting apparatus includes a nozzle plate having a nozzle, and a channel unit having a first surface facing and joined with the nozzle plate. The channel unit has a first channel member having the first surface, and a second channel member having a second surface facing and joined with the first channel member. The second channel member is formed with a first pressure chamber, a second pressure chamber, a first opening and a second opening defined by the second surface, a first connecting channel connecting the first pressure chamber and the first opening, and a second connecting channel connecting the second pressure chamber and the second opening. The first channel member is formed with a third connecting channel connecting the first pressure chamber and the second pressure chamber.

Abstract: A liquid discharge head includes: a channel member having a nozzle surface and a back surface disposed separately from the nozzle surface, the channel member formed having nozzles arranged in the nozzle surface, individual channels connected to the nozzles, first and second common channels connected to the individual channels, a first opening that is opened in the back surface and communicates with an end of the first common channel, and a second opening that is opened in the back surface and communicates with an end of the second common channel, and a filter member disposed on the back surface and having a filter that covers the first opening. The second opening is not covered with the filter, and an area of the first opening is larger than an area of the second opening.