Patent ID: 8288192
Filing Date: 2012-10-16
Classification: B06B,B81B,B81C

Abstract:
1. A method of manufacturing a capacitive electromechanical transducer, comprising: forming a first electrode on a substrate; forming an insulating layer on the first electrode, the insulating layer having an opening that leads to the first electrode; forming a sacrificial layer on the insulating layer; forming a membrane on the sacrificial layer, the membrane having a second electrode; providing an aperture that leads to the sacrificial layer from outside as an etchant inlet; etching the sacrificial layer to form a cavity; and sealing the aperture that serves as the etchant inlet, wherein the etching is executed by electrolytic etching in which a current is caused to flow between the first electrode and an externally placed counter electrode through the opening, the sacrificial layer, and the aperture.