A droplet discharge head includes a plurality of nozzles, first liquid chambers communicating with the nozzles, a first inflow path for supplying a liquid to the first liquid chambers, a first actuator that individually changes pressures of the first liquid chambers, and a second actuator that changes pressures of a plurality of first liquid chambers in common, in which an expansion/contraction amount of the second actuator is larger than that of the first actuator.

First and second individual flow paths coupling a first common liquid chamber to a second common liquid chamber are arranged side by side, and each individual flow path is provided with first and second pressure chambers. At least a part of the first individual flow path is provided in a space overlapping a region between the adjacent second pressure chambers when viewed in a Z axis direction, the space not overlapping the second pressure chamber when viewed in a Y axis direction.

A printing head for inkjet printing comprises: a manifold having a channel for holding material formulation therein; and an array of controllable nozzles fluidly connected to the channel for dispensing the material formulation by inkjet technology. In an embodiment, the array of nozzles is characterized by a pitch that varies along the array. In an embodiment, the nozzles are arranged over a curved line engaging a horizontal plane.

A liquid discharging head includes: a first individual channel array constructed of individual channels aligned in a first direction; and a second individual channel array constructed of individual channels aligned in the first direction. The second individual channel array is arranged side by side to the first individual channel array in a second direction orthogonal to the first direction. Each of the individual channels includes: a nozzle, at least two pressure chambers communicating with the nozzle and arranged in the first direction, and a connecting channel connecting the nozzle and the at least two pressure chambers. The connecting channel has one end in a third direction communicating with the at least two pressure chambers, and the other end in the third direction communicating with the nozzle.

Wall surfaces of the nozzle channel include a first wall surface which extends in the first direction and in which the nozzle is provided and a second wall surface which extends in the first direction and is opposite to the first wall surface, wall surfaces of the first communication channel include a third wall surface which extends in the second direction and a distance from which to the nozzle in the first direction is longest and a fourth wall surface which extends in the second direction and is opposite to the third wall surface, and a fifth wall surface which extends in a third direction set between the first direction and the second direction is provided between the second wall surface and the fourth wall surface.

A liquid ejecting head includes a liquid ejecting section, a first-valve-unit adjusting a pressure of liquid to be supplied to the liquid ejecting section, and a housing accommodating the liquid ejecting section and the first-valve-unit, in which the first-valve-unit includes a first-flow-path communicating with the liquid ejecting section, a first flexible film that has a first-inner-surface defining a part of the first-flow-path and a first-outer-surface being opposite from the first inner surface, and is configured to displace in a first-direction from the first-outer-surface toward the first-inner-surface and in a second-direction opposite to the first-direction, and a first-valve-body that is moved between an opening position and a closing position, due to displacement of the first flexible film, and the housing has a first-opening-portion facing at least a part of the first-outer-surface.

There is provided a head chip including: a first-nozzle; a second-nozzle; a first-pressure-chamber communicating with the first-nozzle; a second-pressure-chamber communicating with the first-nozzle; a third-pressure-chamber communicating with the second-nozzle; a fourth-pressure-chamber communicating with the second-nozzle; a first-piezoelectric-body generating a pressure in the first-pressure-chamber; a second-piezoelectric-body generating a pressure in the second-pressure-chamber; a third-piezoelectric-body generating a pressure in the third-pressure-chamber; a fourth-piezoelectric-body generating a pressure in the fourth-pressure-chamber; a first0individual-electrode coupled to the first-piezoelectric-body; a second-individual-electrode coupled to the second-piezoelectric-body; a third-individual electrode coupled to the third-piezoelectric-body; a fourth-individual-electrode coupled to the fourth-piezoelectric-body; a first-common-electrode commonly coupled to the first-piezoelectric-body and the third-piezoelectric-body; and a second-common-electrode that is independent of the first-common-electrode and is commonly coupled to the second-piezoelectric-body and the fourth-piezoelectric-body.

Printheads for a jetting apparatus. In one embodiment, a printhead comprises a plurality of flow-through jetting channels each configured to jet a print fluid out of a nozzle. The printhead further includes a supply manifold fluidly coupled to the flow-through jetting channels, a return manifold fluidly coupled to the flow-through jetting channels, and one or more bypass manifolds fluidly coupled between the supply manifold and the return manifold.

A pressure variation suppressor includes: a liquid flow chamber through which liquid flows, the liquid flow chamber having an inlet through which the liquid flows in and an outlet through which the liquid flows out; and a flexible film that partitions the liquid flow chamber into a storage chamber in which the liquid is stored and a non-storage chamber in which the liquid is not stored, wherein the flexible film is slack in a state where the liquid flows through the liquid flow chamber.

A liquid ejecting apparatus includes a liquid ejection head, a circulation control section that controls a circulation operation of circulating the liquid in the first individual flow path, and a minute vibration control section that supplies a drive signal having a first waveform to the first piezoelectric element so as to control a minute vibration operation of causing the liquid in the first nozzle to vibrate to such a degree that the liquid is not ejected from the first nozzle. The circulation control section starts the circulation operation at a first time, and the minute vibration control section starts the minute vibration operation at a second time later than the first time.