Abstract: A recording apparatus includes a liquid ejection head, a relative displacement unit configured to cause the liquid ejection head and a recording medium to relatively displace in a relative displacement direction, and a controller. The liquid ejection head has two head units each having nozzles arranged in a nozzle arrangement direction intersecting with the relative displacement direction. The two head units are arranged such that some of the nozzles of the two head units overlap with each other in the relative displacement direction. When a recording command instructing to record an image on a recording medium is an instruction to record a specific image whose length in the nozzle arrangement direction is equal to or less than an arrangement range of the nozzles of the head unit, the controller controls the two head units to cause only one of the two head units to record the specific image.

Abstract: A liquid discharging head includes: individual channels; a first common liquid chamber provided commonly for the individual channels; and a second common liquid chamber provided commonly for the individual channels. Liquid is supplied from the first common liquid chamber to the individual channels and the liquid flows into the second common liquid chamber from the individual channels. Each of the individual channels has: a pressure chamber; a first channel; a nozzle connected to the first channel and configured to discharge the liquid; a second channel separated from the nozzle in a first direction and connecting the pressure chamber and the first channel; and a third channel connected to the first channel on a side opposite to the second channel in the first direction with the nozzle sandwiched between the third channel and the second channel.

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: There is provided a liquid discharge head comprising a channel-forming body. The channel-forming body includes a nozzle surface in which there open a plurality of nozzles arranged in a line. The channel-forming body has formed therein a supply manifold, a return manifold, and a plurality of individual channels. Each individual channel includes a pressure chamber, a descender, a return throttling path, and an interposing channel that interposes between the return throttling path and the descender and communicates with the nozzle. The return throttling path extends in a second direction differing from a first direction being a direction that the interposing channel extends. A cross-sectional area of the return throttling path is smaller than a cross-sectional area of the interposing channel.

Abstract: A liquid discharge head is provided, the liquid discharge head comprising a plurality of individual channels, a first manifold connected to the plurality of individual channels, a second manifold connected to the plurality of individual channels, and a bypass channel connecting the first manifold and the second manifold and being distinct from the individual channels. A flow channel resistance Rct brought about by the plurality of individual channels, a flow channel resistance Rbp of the bypass channel, a bending loss ?P provided when the liquid flows from the first manifold via the bypass channel to the second manifold, and a flow rate Q of the liquid flowing through the bypass channel fulfill a relationship of: 0.5<[Rct/(Rbp+(?P/Q))]<2.0.

Abstract: There is provided a liquid discharge head including: a plurality of first individual channels; a first supply manifold; a first return manifold; a plurality of second individual channels; a second supply manifold; a second return manifold; and a first bypass channel communicating the first supply manifold and the second return manifold. The first bypass channel includes: a first supply connecting channel, a first return connecting channel, and a first connecting channel. Channel resistance in one of the first supply connecting channel and the first return connecting channel is greater than channel resistance in the first connecting channel.

Abstract: A liquid discharge head includes: nozzles aligned on a nozzle surface; a supply manifold configured that a liquid is supplied therein from the outside of the liquid discharge head; a return manifold which is arranged between the nozzle surface and the supply manifold in a first direction, which is configured that the liquid is flown out therefrom to the outside of the liquid discharge head, and which is provided with a return damper part; and individual flow channels each of which corresponds to one of the nozzles. Each of the individual flow channels has a return throttle channel communicating the corresponding nozzle with the return manifold and being arranged between the return manifold and the nozzle surface in the first direction. The return manifold has a compliance larger than a compliance of the supply manifold.

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 includes an individual channel, a first manifold, a filter, a second manifold, and a bypass path. The individual channel has a nozzle. The first manifold is in fluid communication with the individual channel. The filter is disposed in the first manifold. The second manifold is in fluid communication with the individual channel. The bypass path is positioned between the individual channel and the filter in a direction in which liquid flows. The bypass path extends from the first manifold. The bypass path provides fluid communication between the first manifold and the second manifold not via the individual channel.

Abstract: A liquid discharging apparatus includes: a channel member formed with an individual channel, the individual channel including a nozzle and a pressure chamber; a piezoelectric element arranged in the channel member and facing the pressure chamber, the piezoelectric element being configured to apply pressure to liquid in the individual channel; and a driver configured to apply a driving signal to the piezoelectric element, the driving signal being constructed of a plurality of pulse waveforms, wherein the piezoelectric element is driven in a pull-strike system by one piece of the pulse waveforms such that the pressure chamber is depressurized and then pressurized.

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: There is provided a liquid discharge head, including: a first channel member including individual channel rows and first common channels that correspond to the respective individual channel rows; a second channel member including a second common channel provided in common to the first common channels; and a third channel member including at least parts of connection channels connected to the second common channel. One of the connection channels is connected to an end in a longitudinal direction of the second common channel. The liquid discharge head further comprises a communication opening disposed at any other part of the second common channel except the end in the longitudinal direction, the second common channel communicating with the outside through the communication opening.

Abstract: A liquid discharging head includes: individual channels; a first common channel; and a second common channel Each of the plurality of individual channels includes: a pressure chamber, a nozzle, a connecting channel, a first communicating channel, and two second communicating channels. A first vector of the first communicating channel has an orientation from one end to the other end of the first communicating channel. Respective second vectors of the two second communicating channels have orientations, each of the orientations being from one end to the other end of one of the two second communicating channels along an extending direction of the two second communicating channels. The first communicating channel is arranged, with respect to the nozzle, on one side in a second direction orthogonal to the first direction, and the two second communicating channels are arranged, with respect to the nozzle, on the other side in the second direction.

Abstract: There is provided a liquid discharging head including: a plurality of supply manifolds configured to receive a liquid to be discharged from a plurality of nozzles and provided side by side with each other; a supply integration channel arranged on a first side in a longitudinal direction of the supply manifolds; a first connecting channel connecting the supply integration channel and a first supply manifold of the supply manifolds; and a second connecting channel connecting the supply integration channel and a second supply manifold, of the supply manifolds, being adjacent to the first supply manifold in a short direction of the first supply manifold. An outlet of the first connecting channel is arranged on the first side in the longitudinal direction of the supply manifolds; and an outlet of the second connecting channel is arranged on a second side in the longitudinal direction of the supply manifolds.

Abstract: A liquid discharging head is provided with: individual channels; a first common channel; and a second common channel. The individual channels include: first individual channels which have first pressure chambers and which are aligned in a second direction to form a first individual channel array, and second individual channels which have second pressure chambers and which are aligned in the second direction to form a second individual channel array; the first individual channel array and the second individual channel array are arranged in a third direction. The first common channel communicates with both of the first individual channels and the second individual channels; and the first pressure chambers and the second pressure chambers do not overlap with the second common channel in a first direction, and do not overlap with each other in the second direction.

Abstract: There is provided a liquid discharge head, including: a nozzle member formed having nozzle rows extending in a first direction, the nozzle rows being arranged in a second direction; driving elements; a first channel member disposed at one side of the nozzle member in a third direction; a second channel member disposed at the one side of the first channel member in the third direction; and a third channel member disposed at the one side of the second channel member in the third direction.

Abstract: There is provided liquid discharging head including: supply manifolds; supply integration channel which extends linearly along an arrangement direction crossing a longitudinal direction of the supply manifolds; return manifolds; and return integration channel which extends linearly along the arrangement direction. The supply integration channel has supply port arranged apart from the supply manifolds, being configured to supply the liquid to the supply integration channel via the supply port, and at least a part of the supply port being overlapped, in a plan view, with a pressure chamber-arranging area in which a plurality of pressure chambers communicating with nozzles is arranged. The return integration channel has return port arranged apart from the return manifolds, being configured to drain the liquid from the return integration channel via the return port, and at least a part of the return port being overlapped, in the plan view, with the pressure chamber-arranging area.

Abstract: There is provided a liquid discharge head including: a nozzle member; a first common channel member including first common channels; an actuator member including pressure chambers and driving elements; a driver IC; a second common channel member including a second common channel; and a chiller configured to chill the driver IC.

Abstract: There is provided a liquid discharging head including: a pressure chamber configured to apply a pressure to a liquid so as to discharge the liquid from a nozzle; a descender arranged to overlap, in a plan view, with the nozzle and communicating the pressure chamber and the nozzle with each other; at least one return throttle channel connected to the descender; and a return manifold which communicates with the at least one return throttle channel and which is configured to receive the liquid not having been discharged from the nozzle. A cross section of the descender orthogonal to a depth direction of the descender is a non-circular shape having a major axis and a minor axis. The at least one return throttle channel is connected to at least one of a first end side of the minor axis and a second end side of the minor axis.