Patent ID: 6229251
Filing Date: 2001-05-08
Classification: H01L

Abstract:
A monolithic piezoelectric transformer, comprising:a piezoelectric substrate having a laminated body including a plurality of piezoelectric ceramic members, said piezoelectric substrate including a drive portion and a power generation portion which are arranged adjacent to each other in the longitudinal direction of said piezoelectric substrate;said drive portion being polarized in the thickness direction of said piezoelectric substrate and including an input electrode, said input electrode including internal electrodes provided in said drive portion and external electrodes provided on a top and bottom surface of said drive portion such that said internal and external electrodes extend in the longitudinal direction of said piezoelectric substrate; andsaid power generation portion being polarized in the longitudinal direction of said piezoelectric substrate and including an output electrode associated with said power generation;wherein the length of the external electrodes in the longitudinal direction of the piezoelectric substrate is different from that of the internal electrodes and the length of said internal electrodes is about 55% to about 70% of the length of said piezoelectric substrate, and the lengths of said internal electrodes are substantially parallel to the lengths of said external electrodes.