Patent ID: 8368153
Filing Date: 2013-02-05
Classification: B81B,B81C,H01L,H04R,Y10T

Abstract:
1. A wafer level package of micro electromechanical system (MEMS) microphone, comprising: a substrate; a plurality of dielectric layers stacked on the substrate; a MEMS diaphragm disposed between two adjacent dielectric layers of the dielectric layers, and a first chamber being formed between the MEMS diaphragm and the substrate; a plurality of supporting rings disposed in some of the dielectric layers respectively and stacked with each other, and the supporting rings surrounding the MEMS diaphragm; a protective layer disposed on the upmost supporting ring and above the MEMS diaphragm, a second chamber being formed between the MEMS diaphragm and the protective layer, and the protective layer defining a plurality of first through holes for exposing the MEMS diaphragm therefrom; and a guard ring, wherein the guard ring is located in some of the dielectric layers under the MEMS diaphragm and surrounds the first chamber.