Patent ID: 6362559
Filing Date: 2002-03-26
Classification: H01L

Abstract:
A piezoelectric transformer, comprising:a piezoelectric ceramic disk having a radius, a circumference, a thickness and first and second opposing major faces; said piezoelectric ceramic disc being polarized in the thickness direction such that upon application of a first voltage across said first and second opposing major faces, said piezoelectric ceramic disk deforms in a radial direction along said radius and in a tangential direction along said circumference; at least three electrodes segments, each said electrode segments being in the shape of a sector of said first major face; at least one solid dielectric material on said first major face of said piezoelectric ceramic layer between each of said spaced apart electrode segments in said plurality of spaced apart electrode segments; and an electrode on said second major face of said piezoelectric ceramic layer; said electrode being in opposing relation to said electrode segments on said first major face of said piezoelectric ceramic disk; wherein upon application of a first voltage across said electrode and a first electrode segment in opposing relation to said electrode, said piezoelectric ceramic disk deforms in said radial and tangential directions between said electrode and said first electrode segment; and wherein said deformation of said piezoelectric ceramic layer between said electrode and said first electrode segment deforms said piezoelectric ceramic layer adjacent said first electrode segment; and wherein said deformation of said piezoelectric ceramic layer adjacent said first electrode segment generates a second voltage between said electrode and a second electrode segment in opposing relation to said electrode.