Patent ID: 7854498
Filing Date: 2010-12-21
Classification: B41J,H01L

Abstract:
1. A piezoelectric actuator comprising: a vibration plate; a first piezoelectric layer which is formed on one surface of the vibration plate; a second piezoelectric layer which is formed on a surface of the first piezoelectric layer, the surface being on a side not facing the vibration plate; a plurality of individual electrodes which are formed on a surface, of the second piezoelectric layer, on a side not facing the first piezoelectric layer and which are arranged in a predetermined direction; a first common electrode which is formed between the first piezoelectric layer and the second piezoelectric layer, and which has a plurality of first electrodes arranged in the predetermined direction to face the individual electrodes respectively, and a first wire electrically connecting all of the first electrodes; and a second common electrode which is formed between the vibration plate and the first piezoelectric layer, and which has a plurality of second electrodes arranged in the predetermined direction to face the individual electrodes respectively, and a second wire electrically connecting all of the second electrodes; wherein the first wire and the second wire extend in the predetermined direction, and are arranged not to overlap with each other in a stacking direction of the first piezoelectric layer and the second piezoelectric layer.