Patent ID: 7768178
Filing Date: 2010-08-03
Classification: B41J,H01L

Abstract:
1. A piezoelectric device comprising: a substrate; a first electrode formed above a surface of said substrate; a first piezoelectric film formed above said first electrode; a second piezoelectric film formed above said first piezoelectric film; a second electrode formed above said second piezoelectric film; and an intermediate electrode arranged between said first piezoelectric film and said second piezoelectric film; wherein each of said first piezoelectric film and said second piezoelectric film has a thickness of 10 micrometers or smaller, and has a first surface facing toward said substrate and a second surface opposite to the first surface, and at least one of the first surface and the second surface has an arithmetic average surface roughness (Ra) of 0.5 micrometers or smaller; and the first piezoelectric film and the second piezoelectric film are formed by vapor phase deposition, and have upward polarization in the as-deposited state.