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: 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: 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 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 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 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 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 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.

Abstract: A liquid jetting head includes individual channels, a first common channel and a second common channel being return channels for returning liquid from the individual channels to a storage chamber for storing the liquid, and a third common channel being a supply channel for supplying the liquid from the storage chamber to the individual channels. The first to third common channels are arranged in an arrangement direction. The third common channel is arranged between the first and second common channels in the arrangement direction and extends in an extending direction. The individual channels include: first individual channels which connect the first common channel and the third common channel; and second individual channels which connect the second common channel and the third common channel, and each of the individual channels has a nozzle, and a communicating channel that runs directly above the nozzle.

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 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: There is provide a liquid discharge head including: a supply manifold; a feedback manifold; and a plurality of individual flow channels having: a supply portion, a descender portion, and a feedback portion. The supply manifold has a plurality of supply ports, and the feedback manifold has a plurality of feedback ports. At least part of the supply manifold overlaps with the feedback manifold in the second direction. The plurality of pressure chambers have first pressure chambers forming a first pressure chamber array and second pressure chambers forming a second pressure chamber array. The first pressure chamber array is arranged at one side, of the supply manifold, in a third direction and the second pressure chamber array is arranged at the other side, of the supply manifold, in the third direction. The first pressure chamber array and the second pressure chamber array are connected to the supply manifold.

Abstract: There is provide a liquid discharge head including: a supply manifold; a feedback manifold; and a plurality of individual flow channels. Each of the individual flow channels includes: a supply portion, a descender portion, and a feedback portion. The supply manifold has a plurality of supply ports, and the feedback manifold has a plurality of feedback ports. A distance between the center of the supply manifold in a third direction and the plurality of supply ports of the supply manifold is longer than ¼ of the width of the supply manifold in the third direction, and a distance in the third direction between the center of the feedback manifold in the third direction and the plurality of feedback ports of the feedback manifold is shorter than ¼ of the width of the feedback manifold in the third direction.

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: In a liquid ejection head, an ejection pressure is applied to a pressure chamber for liquid ejection from a nozzle. A descender extends in a first direction and includes a first end connected to the pressure chamber and a second end. A communication passage is connected to the second end, extends in a second direction crossing the first direction, and has a first dimension in the first direction. The nozzle is positioned at the communication passage such that a shortest distance between an outer periphery thereof and a center of the second end is greater than 0.5 times a second dimension of the second end in the second direction. When viewed in the first direction, the center of the second end and a center of a cross-section defined by the nozzle to be orthogonal to an extending direction of the nozzle intersect an axis of the communication passage.

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.