Patent ID: 8276254
Filing Date: 2012-10-02
Classification: H04R,Y10T

Abstract:
1. A method of forming a miniature, surface micromachined, differential microphone, the steps comprising: a) depositing a sacrificial layer on a top surface of a silicon wafer; b) depositing a diaphragm material on an upper surface of said sacrificial layer; c) etching said diaphragm material layer to isolate a diaphragm therein; and d) removing at least a portion of said sacrificial layer from a region beneath said defined diaphragm, further comprising at least one of: forming comb sense fingers along at least a portion of a perimeter of said diaphragm as a sub-step of etching step (c); and forming a conductive layer intermediate said top surface of said silicon wafer and said sacrificial layer.