Semiconductor electret capacitor microphone
US6870938B2 · kind B2 · utility
8Cited by
4References
9Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 19, 2001 |
| Grant date | Mar 22, 2005 |
| Priority date | — |
| Expiry date | May 20, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R19/016
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A semiconductor electret capacitor microphone includes a vibration membrane, a semiconductor chip on which are formed a necessary electronic circuit, a fixed electrode, a spacer for preserving a predetermined space between the fixed electrode and the vibration membrane, and a case for enclosing the semiconductor chip and the vibration membrane in such a configuration that the fixed electrode is connected to the ground and the vibration membrane is connected to an input electrode of the semiconductor chip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.