Patent ID: 7585417
Filing Date: 2009-09-08
Classification: H04R

Abstract:
1. A method of fabricating a diaphragm of a capacitive microphone device, comprising: providing a substrate, and forming a dielectric layer on a first surface of the substrate; forming a plurality of silicon spacers on a surface of the dielectric layer; patterning the dielectric layer to form a plurality of dielectric bumps; forming a diaphragm layer on a surface of the silicon spacers, a surface of the dielectric bumps, and the first surface of the substrate so that the diaphragm layer has a corrugate structure by virtue of the dielectric bumps; forming a planarization layer on the diaphragm layer, and etching a second surface of the substrate to form a plurality of openings corresponding to the corrugate structure; removing the dielectric bumps exposed through the openings; and removing the planarization layer.