A liquid discharge head according to the present invention includes a flow passage member and a plurality of pressurizing sections. The flow passage member includes a plurality of discharge holes, a plurality of pressurizing chambers respectively connected to the plurality of the discharge holes, a plurality of first flow passages respectively connected to the plurality of the pressurizing chambers to supply liquid to the plurality of the pressurizing chambers, a plurality of second flow passages respectively connected to the plurality of the pressurizing chambers to collect the liquid from the plurality of the pressurizing chambers, and a plurality of third flow passages respectively connected to the pressurizing chambers to supply the liquid to the pressurizing chambers. A plurality of the pressurizing sections respectively pressurizes the plurality of the pressurizing chambers.

Provided are a painting robot system that may perform painting well not only on a forward path but also on a backward path, and a painting method. An image processing portion (210) included in a painting robot system (11) creates image data for a forward path in a state of having first strip image data of a strip shape corresponding to nozzles (54A) in a first nozzle column (55A) and second strip image data of a strip shape corresponding to nozzles (54B) in a second nozzle column (55B), the image processing portion (210) creates the second strip image data as image data for a backward path in a state of deviating relative to the first strip image data, and the amount of position deviation is set as the following position: the Pth nozzle (54B) in the second nozzle column (54B) lands first relative to the Pth nozzle (54A) in the first nozzle column (54A) with an adjacent landing position at a distance of multiplying the number (N) by twice of the distance (L1).

A liquid ejecting head includes a first compression chamber row 11A on other side of a sub-manifold 5a, which extends in one direction, in other direction, and a second compression chamber row 11B on one side of the sub-manifold 5a in the other direction. First restricting-portion bodies 6Aa and second restricting-portion bodies 6Ba extend in a direction that crosses the one direction, and are alternately arranged in the one direction. First inlets 6Ab are on the one side of the second outlets 6Bc in the other direction. The first inlets 6Ab have an opening width greater than an opening width of the second outlets 6Bc. Channels of the second restricting portions 6B have a similar configuration.

A printhead module includes: a monolithic substrate having alternate longitudinal slots and longitudinal ink supply channels defined through a thickness of the substrate and extending parallel with each other along a length of the substrate; and a plurality of rows of print chips mounted on a front face of the substrate, each row of print chips receiving ink only from a respective one of the ink supply channels. Each one of the longitudinal slots is configured to supply power and data only to a respective one of the rows of print chips.

Provided is a liquid ejection device capable of ejecting a minute liquid droplet with stability, in which a capacity of a pressure chamber facing a second partition portion increases, and a capacity of the pressure chamber facing a first partition portion decreases, at a time when a voltage is applied so that a potential of a first electrode becomes lower than a potential of a second electrode, compared to a time when a voltage is applied so that the potential of the first electrode becomes the same as the potential of the second electrode, the first electrode and the second electrode being included in an electrode formed on each of both side surfaces of partitions.

An ink jet head includes first side walls including two piezoelectric elements, second side walls, a first electrode, a second electrode, an ink chamber containing conductive ink, and a control unit. The second side walls alternate with the first side walls to provide side surfaces for driving pressure chambers and dummy pressure chambers. On one of the first side walls, the first electrode is on the side wall surface of a driving pressure chamber and a second electrode is on the side wall surface of a dummy pressure chamber. The control unit applies a voltage having a first waveform to the first electrode, and a voltage having a second waveform, a portion of which is inverted with respect to the first waveform, to the second electrode to cause ink to be ejected, and cause the second electrode to electrically float such that ink is not ejected.

An ink jet head includes a base, walls attached to the base and defining flow paths between the walls, the flow paths including first and second flow paths alternating with one another, a nozzle plate comprising openings, each of which communicates with one of the first flow paths, an ink supply unit fluidly coupled to the first flow paths, electrodes on side surfaces of the walls, first and second wirings, each extending along the base and each being individually connected to one of the electrodes, a plurality of first protective layers on the base, the first wiring extending between a first pair of the first protective layers and the second wiring extending between a second pair of the first protective layers, and a second protective layer comprising an electrically insulating layer covering the first protective layers and the first and second wirings.

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 connection method includes softening a resin film of a thermosetting resin by heating an element electrode of a piezoelectric body and a substrate electrode of a flexible cable to be connected to the piezoelectric body with the element electrode and the substrate electrode being pressed into contact with each other via the resin film; partially pushing out the molten resin film from an opposing position of the element electrode and the substrate electrode so as to bring a solder layer provided on the substrate electrode into contact with the element electrode; curing the resin film and melting solder in the solder layer by further raising a heating temperature; discharging excess solder in a direction defined by the cured resin film; and then solidifying the solder in the solder layer so as to solder the element electrode and the substrate electrode together.

The head has a passage member having a nozzle and a pressurizing chamber which is communicated with the nozzle and is positioned on the side opposite to the side where the nozzle is opened, a piezoelectric actuator substrate which is superimposed on the passage member so as to cover the pressurizing chamber, and a flexible printed circuit which faces the piezoelectric actuator substrate from the opposite side to the passage member. The piezoelectric actuator substrate has a piezoelectric body which is exposed on the flexible printed circuit side. The piezoelectric body has a via hole opened toward the flexible printed circuit and has a projection portion at the edge part of the via hole which projects to the flexible printed circuit side.