Microphone manufacturing method
First Claim
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.
3 Assignments
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Accused Products
Abstract
A microphone manufacturing method that includes forming an etching protective film on a surface of a semiconductor substrate, opening an etching window through the etching protective film, and forming a sacrifice layer in the etching window and also on an upper face of the etching protective film. The method includes forming a vibration film above said sacrifice layer and 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 the etching protective film and located apart from the etching window. The etching process uses an etchant to which the etching protective film is resistant, to open the etching window. The method includes crystal anisotropically etching said semiconductor substrate through the port and the etching window by using an etchant to which the etching protective film is resistant so that a cavity is formed.
7 Citations
9 Claims
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1. A microphone manufacturing method comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification