A liquid discharge head is provided which comprises a head body, a casing and a thermal insulator. The head body comprises a surface having one or more holes configured to discharge liquids therethrough. The casing, disposed on the head body, comprises a heat generator configured to generate heat and a heat sink configured to dissipate the heat. The thermal insulator is between the heat sink and the head body.

A liquid ejection head is provided which comprises a channel member and a housing. The channel member comprises a first surface, which includes one or more ejection ports configured to eject liquid from the first channel member, and a second surface different from the first surface. The housing is disposed on the second surface and comprises one or more electric circuits. The second surface of the channel member comprises a first opening located outside of the housing and is configured to receive the liquid supplied to the one or more ejection ports.

A liquid discharge head includes: individual channels including nozzles respectively; first supply channels through which liquid is supplied to the individual channels; first discharge channels through which the liquid is discharged from the individual channels; a second supply channel through which the liquid is supplied to the first supply channels; a second discharge channel to which the liquid is discharged from the first discharge channels; supply connection openings positioned between the first supply channels and the second supply channel and connecting the first supply channels and the second supply channel; discharge connection openings positioned between the first discharge channels and the second discharge channel and connecting the first discharge channels and the second discharge channel; a supply opening through which the liquid is supplied to the second supply channel; and a discharge opening to which the liquid is discharged from the second discharge channel.

A liquid discharge head according to the present disclosure includes a plurality of discharge holes, a plurality of pressure applying chambers, a flow path member including a plurality of common flow paths, and a plurality of pressure applying modules. Adjacent discharge hole groups have a part in which, when a discharge hole A is positioned in an n column in one of the discharge hole groups, a discharge hole B in the discharge hole group located adjacent with the common flow path interposed therebetween is positioned in an n1 column. A discharge hole C in the discharge hole group located at a center in a second direction is positioned in an n column, while a non-carry discharge hole is positioned in an n1 column.

A printhead module includes a plurality of rows of printhead nozzles, at least some of the rows including at least one displaced row portion, the displacement of the row portion including a component in a direction normal to that of a pagewidth to be printed, wherein the displaced row portions of at least some of the rows are different in length than the displaced row portions of at least some of the other rows.

A liquid discharge head includes: a first flow path member that discharges a liquid; a second flow path member including a supply flow path for sending the liquid to the first flow path member, and a collecting flow path for collecting the liquid from the first flow path member. The supply flow path includes a supply branch flow path that branches out at a center portion of the second flow path member in the first direction and extends in a first direction and in a third direction opposite thereto. The collecting flow path includes a collecting branch flow path that branches out at the center portion of the second flow path member in the first direction and extends in the first direction and in the third direction. When viewed in plan, the supply branch flow path and the collecting branch flow path overlap each other.

A piezoelectric actuator is provided, including a vibration plate, a piezoelectric layer, a plurality of individual electrodes arranged in two arrays, first and second common electrodes which have first and second facing portions facing parts of the individual electrodes and first and second connecting portions connecting the first and second facing portions respectively, and first and second wiring portions which are arranged on the vibration plate and which are connected to the first and second common electrodes respectively via first and second connecting wirings, wherein one of the first connecting wirings connects the first connecting portion and one of the first wiring portion while striding over the second connecting portion.

The present application provides a coater and a coating method for enhancing the coating quality by improving smoothness of a mixed part where the coating position in the previous scan overlaps the coating position in the next scan. The coater includes a robot arm configured to move a nozzle head unit by driving arms via an arm driving mechanism and a coating control unit configured to control driving of the nozzle driving mechanism and driving of the arm driving mechanism to execute coating on the coating object; the coating control unit performs coating by forming, in segmented coating surfaces formed by each scanning of the nozzle head unit, a normal coating region coated with a target coating film thickness and an overlapping coating region coated with a spray amount of the paint less than the normal coating region; and the coating control unit performs a overlapping coating control by mixing the overlapping coating region in the previous and next scans and taking the coating film thickness of the mixed overlapping coating region as the target coating film thickness to perform coating.

A liquid discharge head includes: first and second common channels extending in a first direction; and individual channels including pressure chambers and nozzles. Each of the individual channels includes: a supply portion; a descender portion extending in a second direction; and a return portion extending in a third direction. The return portion includes: a throttle portion; and a wide portion. Each of the nozzles overlaps with the wide portion. A relationship of L2>L1 is satisfied, wherein L1 is a distance in the third direction from a center of each of the nozzles to a throttle starting position, and L2 is a distance in the third direction passing through a center in a cross section of the descender portion and ranging from a center line parallel to the second direction to the center of each of the nozzles.

A liquid jetting apparatus includes a nozzle plate having a nozzle, and a channel unit having a first surface facing and joined with the nozzle plate. The channel unit has a first channel member having the first surface, and a second channel member having a second surface facing and joined with the first channel member. The second channel member is formed with a first pressure chamber, a second pressure chamber, a first opening and a second opening defined by the second surface, a first connecting channel connecting the first pressure chamber and the first opening, and a second connecting channel connecting the second pressure chamber and the second opening. The first channel member is formed with a third connecting channel connecting the first pressure chamber and the second pressure chamber.