发明名称 |
Micro electro-mechanical system (MEMS) microphone device with multi-sensitivity outputs and circuit with the MEMS device |
摘要 |
A MEMS device includes substrate having a cavity. A dielectric layer is disposed on a second side of substrate at periphery of the cavity. A backplate structure is formed with the dielectric layer on a first side of the substrate and exposed by the cavity. The backplate structure includes at least a first backplate and a second backplate. The first backplate and the second backplate are electric disconnected and have venting holes to connect the cavity and the chamber. A diaphragm is disposed above the backplate structure by a distance, so as to form a chamber between the backplate structure and the diaphragm. A periphery of the diaphragm is embedded in the dielectric layer. The diaphragm serves as a common electrode. 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. |
申请公布号 |
US8934649(B1) |
申请公布日期 |
2015.01.13 |
申请号 |
US201314013049 |
申请日期 |
2013.08.29 |
申请人 |
Solid State System Co., Ltd. |
发明人 |
Lee Chien-Hsing;Hsieh Tsung-Min;Liou Jhyy-Cheng |
分类号 |
H04R25/00;H04R17/02;H04R3/00 |
主分类号 |
H04R25/00 |
代理机构 |
Jianq Chyun IP Office |
代理人 |
Jianq Chyun IP Office |
主权项 |
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. |
地址 |
Hsinchu TW |