Brother Kogyo Kabushiki-kaisha

Masashi Ono

Yasuhiro Sekiguchi

Atsushi Ito

Shohei Koide

Masatomo Kojima

Naoki Katayama

Keiji Kura

Yoshitsugu Morita

Shigeru Suzuki

Koichiro Hara

A liquid droplet discharge head includes a plurality of discharge unit parts, each of which extends in a first direction. The discharge unit parts are arranged in a second direction intersecting with the first direction. Each of the discharge unit parts includes: a nozzle column configured by a plurality of nozzles; a liquid droplet discharge surface; a common flow path; a plurality of pressure chambers; a damper chamber extending in the first direction; a damper wall arranged between the damper chamber and the common flow path; and a pillar part connecting the damper wall and a separate wall that is different from the damper wall in the damper chamber. A position of the pillar part of at least one discharge unit part of the discharge unit parts in the first direction is deviated from a position of the pillar part in the other discharge unit part.

Liquid droplet discharge head

A piezoelectric actuator includes piezoelectric material layers, individual electrodes corresponding to pressure chambers, a first common constant electric potential electrode corresponding to outer peripheral portions of the pressure chambers, and a second common constant electric potential electrode corresponding to central portions of the individual electrodes. A plurality of first active portions is formed in areas of the piezoelectric material layers sandwiched between the individual electrodes and the second common constant electric potential electrode, and a plurality of second active portions is formed in areas of the piezoelectric material layers sandwiched between the individual electrodes and the first common constant electric potential electrode. Since the second common constant electric potential electrode has a mesh-shaped form, it is possible to reduce an impedance thereof.

Liquid droplet jetting apparatus and liquid droplet jetting head

A piezoelectric actuator includes first active portions corresponding to center portions in a row direction of pressure chambers and second active portions corresponding to left and right portions on outer peripheral sides which are more outside than the center portions of the pressure chambers. When applying voltage to the first active portions, the first active portions deform to project toward pressure chambers. At this time, the second active portions do not deform and the influence of deformation of the first active portions does not reach the adjacent pressure chambers. Accordingly, effect of suppressing crosstalk is exhibited.

Liquid-droplet jetting apparatus and liquid-droplet jetting head

In a liquid droplet jetting mode of jetting liquid droplets, a controller controls a piezoelectric actuator to perform a liquid droplet jetting operation in which volume of a pressure chamber is decreased to a decreased volume smaller than a predetermined volume, and then the volume of the pressure chamber is increased to an increased volume greater than the predetermined volume, and the volume of the pressure chamber is again decreased to the decreased volume. On the other hand, in a warm-up mode of heating the liquid in the pressure chamber, the controller controls the piezoelectric actuator to perform at least one of a first warm-up operation in which the volume of the pressure chamber is changed repeatedly between the predetermined volume and the increased volume, and a second warm-up operation in which the volume of the pressure chamber is changed repeatedly between the predetermined volume and the decreased volume.

Growing community of inventors

Okazaki, Japan

Masashi Ono