Abstract: A liquid discharging head includes a stacked body in which plates are adhered to each other by an adhesive. The stacked body is provided with: individual channels including nozzles and pressure chambers, respectively, and aligned in a predetermined aligning direction, the pressure chambers being configured to be pressurized to discharge liquid from the nozzles; a supply manifold being communicated with the individual channels and supplying the liquid to the individual channels; a return manifold being communicating with the individual channels and configured to allow the liquid, which flows in the individual channels and which is not discharged from the nozzles, to flow therethrough; and a dummy channel arranged side by side with the individual channels in the aligning direction. The dummy channel is positioned at outside with respect to an outermost individual channel in the aligning direction.

Abstract: There is provided liquid discharging head including individual channels, supply throttles, and return throttles formed in plates. The supply throttles are formed in first plate of the plates and the return throttles are formed in second plate of the plates. Each of the supply throttles has cross section which is rectangle having first and second sides. Each of the return throttles has cross section which is rectangle having first and second sides. The length of the first side of each of the supply throttles and the length of the first side of each of the return throttles are substantially identical. The length of the second side of each of the supply throttles and the length of the second side of each of the return throttles are substantially identical. Aspect ratio of each of the supply throttles and aspect ratio of each of the return throttles are substantially identical.

Abstract: A liquid discharge head includes a flow passage member, a sealing member, and an actuator member. The flow passage member is formed with individual flow passages each including a nozzle and a pressure chamber and the flow passage member has a surface on which the pressure chamber is open. The sealing member is arranged on the surface and seals the pressure chamber. The actuator member has a piezoelectric layer, a driving electrode, and a high electric potential portion. The piezoelectric layer is adhered to a first surface of the sealing member on a side opposite to the flow passage member, via a first adhesive having an insulating property. The driving electrode is arranged on a side opposite to the sealing member with respect to the piezoelectric layer at a position overlapped with the pressure chamber in a first direction orthogonal to the surface.

Abstract: There is provided liquid discharging head including; channel member which includes plates stacked in a first direction and adhered to each other via adhesive, and in which individual channels each including nozzle and pressure chamber communicated with the nozzle is formed. The plates include first plate and second plate adhered to adhesion surface of the first plate via the adhesive. Hollows each construct one of the individual channels are opened in the adhesion surface. The hollows are arranged side by side in second direction orthogonal to the first direction in the adhesion surface, and three or more grooves are formed in the adhesion surface between two of the hollows adjacent to each other in the second direction, each of the three or more grooves extending in third direction which is orthogonal to the first direction and which crosses the second 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: There is provided a liquid discharging head including: supply manifolds; a supply integration channel which extends linearly along an arrangement direction crossing a longitudinal direction of the supply manifolds; return manifolds; and a return integration channel which extends linearly along the arrangement direction. The supply integration channel has a supply port arranged apart from the supply manifolds, being configured to supply 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 pressure chambers communicating with nozzles are arranged. The return integration channel has a 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: 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: A liquid ejecting head includes a channel forming body including a plurality of individual channels, a first manifold and a second manifold. The plurality of individual channels includes: a nozzle; a pressure chamber which is arranged to be apart from the nozzle in a first direction; a descender communicating the pressure chamber and the nozzle with each other, and extending in the first direction; a return channel including a first return channel and a second return channel, extending in a direction crossing the first direction, and having one end connected to the descender; and a communicating channel including a first communicating channel, and connecting the other end of the return channel to the second manifold. The first communicating channel connects the first return channel to the second manifold and connects the second return channel to the second manifold.

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.