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 liquid ejecting head includes a chamber forming portion in which a pressure chamber is formed, the pressure chamber being provided with a supply port for supplying a liquid thereto and a nozzle for ejecting the liquid therefrom, an diaphragm that has a first surface being a wall surface of the pressure chamber and a second surface opposite to the first surface and that oscillates and thereby applies pressure to the pressure chamber, support walls that are disposed so as to be in contact with the second surface and so as to protrude in a direction intersecting the second surface, and piezoelectric elements that are disposed at the diaphragm and that oscillates the diaphragm. The support walls and the piezoelectric elements are provided so as to serve for the pressure chamber, and longitudinal directions of the support walls are parallel to respective longitudinal directions of the piezoelectric elements.

There is provided a liquid discharge head including: a plurality of pressure chambers including pressure chambers aligned in a first direction orthogonal to a vertical direction so as to form a first pressure chamber group, and pressure chambers aligned in the first direction so as to form a second pressure chamber group arranged side to side relative to the first pressure chamber group in a second direction; a return channel extending in the first direction; and return connecting channels each connecting the return channel and one of the plurality of pressure chambers to each other, wherein a height of an upper surface of each of the return connecting channels is not less than a height of an upper surface of one of the plurality of pressure chambers which is connected to the return channel by each of the return connecting channels.

There is provided a liquid discharge head which includes a plurality of individual channels, each individual channel including a nozzle and a pressure chamber, an actuator, a supply channel, and a return channel. For each individual channel of the plurality of individual channels, with respect to the nozzle, the return channel and the pressure chamber are disposed at one side in the array direction, and the supply channel is disposed at the other side in the array direction. An end portion of the pressure chamber at the one side in the array direction is positioned between the nozzle and an end portion of the return channel at the one side in the array direction. A center of the return channel in the array direction is positioned between the nozzle and the outlet port.

A liquid discharge head includes: an individual channel having an inlet and an outlet, the individual channel including: a nozzle, an upstream-side pressure chamber arranged between the inlet and the nozzle, a downstream-side pressure chamber arranged between the outlet and the nozzle, an upstream-side throttle channel connecting the inlet and the upstream-side pressure chamber, and a downstream-side throttle channel connecting the outlet and the downstream-side pressure chamber; a supply channel connected to the inlet and configured to supply liquid to the individual channel; a recovery channel connected to the outlet and configured to recover the liquid from the individual channel; an upstream-side actuator configured to apply pressure to the liquid inside the upstream-side pressure chamber; and a downstream-side actuator configured to apply the pressure to the liquid inside the downstream-side pressure chamber. The channel resistance of the downstream-side throttle channel is smaller than that of the upstream-side throttle channel.

A liquid discharge head includes: individual channels; a supply channel connected to inlets of the individual channels and through which liquid is supplied to the individual channels; and a recovery channel connected to outlets of the induvial channels and through which the liquid is recovered from the individual channels. Each of the induvial channels includes: a nozzle; an upstream-side pressure chamber disposed between the nozzle and the supply channel; a downstream-side pressure chamber disposed between the nozzle and the recovery channel; an upstream-side throttle channel connecting the supply channel and the upstream-side pressure chamber; and a downstream-side throttle channel connecting the recovery channel and the downstream-side pressure chamber. A channel resistance of the upstream-side throttle channel is smaller than a channel resistance of the downstream-side throttle channel.

Provided is a liquid ejection head including: a liquid ejection part including a pressure chamber, a nozzle, and a liquid discharge flow path; a liquid storage part including a supply liquid chamber and a discharge liquid chamber; and a flow path part including an intermediate supply flow path and an intermediate discharge flow path. The intermediate supply flow path and the intermediate discharge flow path are formed such that a minimum distance between an opening of the intermediate supply flow path on a side facing the liquid storage part and an opening of the intermediate discharge flow path on the side facing the liquid storage part is greater than a minimum distance between a liquid inlet and a liquid discharge outlet on a predetermined first opening forming surface.

A driving method is provided which enables a liquid feeding apparatus using a driving element in a membrane shape to feed a liquid at high liquid feeding accuracy. To this end, a voltage applied to the driving element is controlled in such a way as to repeat a first period in which a first voltage is applied and a second period which is a longer period than the first period and used to effect a change between the first voltage and a second voltage lower than the first voltage, and in such a way as to switch between application and non-application of the first voltage during the first period.

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 droplet discharge head each includes a first liquid chamber formed on a flow path forming substrate, a nozzle communicating with the first liquid chamber, and a first inflow path for supplying a liquid to the first liquid chamber, and a first actuator that individually changes a pressure in the first liquid chamber, a second actuator that changes pressures in a plurality of first liquid chambers in common, in which an amount of expansion/contraction of the second actuator is larger than that of the first actuator.