Patent ID: 6295247
Filing Date: 2001-09-25
Classification: B06B,H03H

Abstract:
A capacitive ultrasonic transducer comprising:a) a support structure comprising:i) a substrate having a conductive back electrode; andii) a support material on said substrate, said support material having support regions having a height h.sub.s, a thickness t.sub.s, and at least two extended parallel edges;b) a membrane fixed to said support regions above said parallel edges and supported above said substrate to define an elongated gap between said membrane, said substrate, and said support regions, said membrane having a thickness t.sub.m and capable of vibrating above said elongated gap at a predetermined frequency, wherein h.sub.s, t.sub.s, and t.sub.m are chosen to couple energy of said membrane vibrating at said predetermined frequency to a particular acoustic mode of said support structure; andc) a conductive film in communication with said membrane above said elongated gap.