Patent ID: 7849583
Filing Date: 2010-12-14
Classification: H04R,Y10T

Abstract:
1. A microphone manufacturing method comprising the steps of: forming an etching protective film on a surface of a semiconductor substrate, and then opening an etching window through said etching protective film; forming a sacrifice layer in said etching window and on an upper face of said etching protective film; forming a vibration film above said sacrifice layer; starting an etching process of said sacrifice layer through a preformed port at a location wherein said sacrifice layer is sandwiched by said vibration film and said etching protective film and wherein said port is located at a position apart from said etching window, by using an etchant to which said etching protective film is resistant, so that said etching window is opened; and crystal anisotropically etching said semiconductor substrate through said port and said etching window by using an etchant to which said etching protective film is resistant so that a cavity is formed on the surface side of said semiconductor substrate.