There is provided a liquid jetting head including: a supply manifold configured to define a first circulation channel through which a liquid in the supply manifold circulates; descenders that communicate with the supply manifold, and which is configured to guide the liquid to nozzles, respectively; and a second circulation channel configured to guide the liquid not discharged from the nozzles to the supply manifold. The second circulation channel includes a return manifold that extends to communicate with the descenders, and a return channel that communicates with the return manifold and communicates with the supply manifold via a return port. A first end of the first circulation channel in the supply manifold is an outflow port and a second end of the first circulation channel in the supply manifold is an inflow port. In the supply manifold, the return port is closer to the inflow port than to the outflow port.

There is provided a liquid jetting head including: a supply manifold configured to define a first circulation channel through which a liquid in the supply manifold circulates; descenders that communicate with the supply manifold, and which is configured to guide the liquid to nozzles, respectively; and a second circulation channel configured to guide the liquid not discharged from the nozzles to the supply manifold. The second circulation channel includes a return manifold that extends to communicate with the descenders, and a return channel that communicates with the return manifold and communicates with the supply manifold via a return port. A first end of the first circulation channel in the supply manifold is an outflow port and a second end of the first circulation channel in the supply manifold is an inflow port. In the supply manifold, the return port is closer to the outflow port than to the inflow port.

There are provided a head chip and so on capable of improving the print image quality while suppressing the manufacturing cost. The head chip according to an embodiment of the present disclosure includes an actuator plate having a plurality of ejection grooves, a nozzle plate having a plurality of nozzle holes, and a cover plate having a first through hole, a second through hole, and a wall part. The plurality of nozzle holes includes a plurality of first nozzle holes arranged so as to be shifted toward the first through hole, and a plurality of second nozzle holes arranged so as to be shifted toward the second through hole. In a first ejection groove communicated with the first nozzle hole, a first cross-sectional area of a part communicated with the first through hole is smaller than a second cross-sectional area of a part communicated with the second through hole. In a second ejection groove communicated with the second nozzle hole, the second cross-sectional area is smaller than the first cross-sectional area. A first expansion flow channel part is formed in the vicinity of the first nozzle hole, and a second expansion flow channel part is formed in the vicinity of the second nozzle hole. A central position of the first expansion flow channel part coincides with a first central position of the first nozzle hole, or is shifted toward the first through hole. A central position of the second expansion flow channel part coincides with a second central position of the second nozzle hole, or is shifted toward the second through hole.

There is provided a liquid discharge head including: a communication plate formed with a descender connected to a nozzle, a pressure chamber plate including a plurality of pressure chambers aligning in an array direction, a piezoelectric element, and a discharge common channel. The discharge common channel extends in the array direction, is connected to the plurality of pressure chambers, and has a first discharge portion and a second discharge portion. The discharge common channel is configured to discharge liquid toward one side in the array direction. The second discharge portion includes an expansion portion to expand beyond the first discharge portion in a width direction orthogonal to the stacking direction and to the array direction.

Described herein is an inkjet ink composition and an inkjet cartridge comprising an inkjet ink composition and an ink ejection device comprising a recirculation system. The inkjet ink composition may comprise a latex polymer and an ink vehicle. The ink vehicle comprising water and a co-solvent comprising a solvent having a boiling point in the range of about 170° C. to about 215° C. and a solvent having a boiling point of about 220° C. or more.

A liquid ejection head includes: a substrate in which a supply path which opens on a first surface and supplies an ejection liquid is formed; an insulating layer provided on the first surface of the substrate; an energy generating element provided on a surface of the insulating layer; an electric wiring layer electrically connected to the energy generating element and electrically insulated from the ejection liquid by the insulating layer; and an ejection orifice member which forms an ejection orifice and forms a flow path of the ejection liquid from an opening of the supply path to a formation position of the energy generating element. In the vicinity of the opening of the supply path, the insulating layer forms a recessed region by being dented closer to the substrate than the surface on which the energy generating element is provided or by being removed.

A liquid discharge head includes nozzles, pressure chambers, a common supply channel, a common collection channel, and an air chamber. The nozzles are configured to discharge liquid. The pressure chambers are communicated with the nozzles, respectively. The common supply channel is communicated with the pressure chambers. The common supply channel includes a displaceable first region in a part of a wall of the common supply channel. The common collection channel is communicated with the pressure chambers. The common collection channel includes a displaceable second region in a part of a wall of the common collection channel. The air chamber faces a surface of the first region and a surface of the second region. The surface of the first region is opposite the wall of the common supply channel. The surface of the second region is opposite the wall of the common collection channel.

A fluid ejection device includes a fluid ejection die to eject drops of fluid and a body to support the fluid ejection die, with the fluid ejection die including a fluid ejection chamber, a drop ejecting element within the fluid ejection chamber, and a fluid feed hole communicated with the fluid ejection chamber, and with the body including a fluid feed slot communicated with the fluid feed hole of the fluid ejection die. The fluid ejection device includes a micro-recirculation system to recirculate fluid within the fluid ejection die through the fluid ejection chamber, and a macro-recirculation system to recirculate fluid within the body through the fluid feed slot across the fluid feed hole of the fluid ejection die.

A fluid ejection unit may include a fluid supply passage, a fluid circulation loop having a first segment extending from the fluid supply passage, a second segment extending from the fluid supply passage and a bend connecting the first segment and the second segment, a fluid ejector along the second segment, the fluid ejector comprising a fluid ejection orifice and a fluid actuator and a fluid bypass spaced from the fluid actuator and in parallel with the bend to connect the first segment and the second segment.

There is provided a liquid discharge head including: a communication plate formed with a descender connected to a nozzle, a pressure chamber plate including a plurality of pressure chambers aligning in an array direction, a piezoelectric element, and a discharge common channel. The discharge common channel extends in the array direction, is connected to the plurality of pressure chambers, and has a first discharge portion and a second discharge portion. The discharge common channel is configured to discharge liquid toward one side in the array direction. The second discharge portion includes an expansion portion to expand beyond the first discharge portion in a width direction orthogonal to the stacking direction and to the array direction.