Patent ID: 7784920

Claim:
A liquid-droplet jetting apparatus which jets a liquid in a form of liquid droplets, comprising: a channel unit which includes a plurality of nozzles, a plurality of pressure chambers arranged on a plane, and which communicates with the nozzles respectively, and a common liquid chamber which communicates with the pressure chambers; and a piezoelectric actuator which changes selectively a volume of the pressure chambers to apply a pressure to the liquid in the pressure chambers; the piezoelectric actuator including: a plate arranged on a surface of the channel unit such that the plate covers the pressure chambers, a piezoelectric layer arranged on a surface of the plate at an area facing the pressure chambers, the surface being on a side opposite to the pressure chambers, a plurality of individual electrodes arranged on one surface of the piezoelectric layer, at areas each of which faces one of the pressure chambers, and a common electrode arranged on other surface of the piezoelectric layer; wherein a portion of the common liquid chamber and the pressure chambers are arranged adjacently on said plane such that there is no overlapping area between the portion and the pressure chambers in the plane; the plate is extended from an area facing the pressure chambers up to an area facing the portion of the common liquid chamber; and a recess is formed in a portion of the plate facing the portion of the common liquid chamber.