Patent ID: 7173602
Filing Date: 2007-02-06
Classification: B06B,G02F,G09G,H01L,Y10T

Abstract:
1. A thin film piezoelectric transducer comprising: a supporting base having a cavity formed therein; a diaphragm disposed on said supporting base; a piezoelectric film layer located above said cavity, said piezoelectric film layer having: a first electrode layer and a second electrode layer disposed on said diaphragm; a third electrode layer disposed on said piezoelectric film layer; wherein said second electrode layer and said third electrode layer are spaced apart along said upper surface of said piezoelectric film layer; said first electrode layer, said second electrode layer, and said third electrode layer independently contact said piezoelectric film layer; and only a part of said first electrode layer of said three electrode layers is disposed between said diaphragm and said piezoelectric film layer.