Patent ID: 7703896
Filing Date: 2010-04-27
Classification: B41J

Abstract:
1. A liquid-droplet jetting apparatus which jets liquid droplets, the apparatus comprising: a channel unit which includes a pressure chamber communicating with a nozzle; and a piezoelectric actuator which changes a volume of the pressure chamber to apply a pressure to a liquid in the pressure chamber, and which includes a plate arranged on one surface of the channel unit so as to cover the pressure chamber; a piezoelectric layer arranged at an area, of the plate, overlapping with the pressure chamber such that the piezoelectric layer covers one edge of the pressure chamber in a predetermined direction and the piezoelectric layer is extended in the predetermined direction from a position overlapping with the one edge of the pressure chamber, the area being on a surface of the plate on a side opposite to the pressure chamber; an individual electrode arranged on one surface of the piezoelectric layer; and a common electrode arranged on the other surface of the piezoelectric layer; wherein a length in the predetermined direction of a portion, of the piezoelectric layer, which faces the pressure chamber is shorter than half a length of the pressure chamber in the predetermined direction.