Patent ID: 9144967
Filing Date: 2015-09-29
Classification: B41J,H01L

Abstract:
1. A piezoelectric actuator, comprising: a ceramic substrate being long in a first direction, a plurality of individual electrodes, and a plurality of first surface electrodes, wherein the ceramic substrate comprises a vibrating plate, a common electrode disposed on the vibrating plate, and a piezoelectric ceramic layer disposed on the common electrode and having a surface, the piezoelectric ceramic layer has a plurality of first through holes connected to the surface and the common electrode, a plurality of the individual electrodes are disposed in a region of the surface of the piezoelectric ceramic layer opposed to the common electrode, a plurality of the first surface electrodes have a part disposed inside a plurality of the first through holes in the piezoelectric ceramic layer and a part disposed on a circumference of a plurality of the first through holes on the surface of the piezoelectric ceramic layer, the surface of the piezoelectric layer has a second direction orthogonal to the first direction, a plurality of the first through holes are arranged along the first direction at a central part of the ceramic substrate in the second direction when viewing the surface, and the first surface electrodes located on the surface of the piezoelectric ceramic layer are long in the first direction.