Patent ID: 8934649
Filing Date: 2015-01-13
Classification: H04R

Abstract:
1. A micro electro-mechanical system (MEMS) microphone device, comprising: a substrate, having a first side and a second side, wherein a cavity is formed at the second side; a backplate structure, formed over the first side of the substrate, wherein the backplate structure includes at least a first backplate and a second backplate, wherein the first backplate and the second backplate are electric disconnected and have venting holes; a diaphragm, formed over the first side of the substrate against the backplate structure by a distance, so as to form a chamber between the backplate structure and the diaphragm, wherein the diaphragm serves as a common electrode, wherein the first backplate and the second backplate respectively serve as a first electrode unit and a second electrode unit in conjugation with the diaphragm to form separate two capacitors, the two capacitors are exposed by the cavity.