Solid state condenser and microphone devices
US5490220A · kind A · utility
184Cited by
9References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 5, 1994 |
| Grant date | Feb 6, 1996 |
| Priority date | — |
| Expiry date | May 5, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/604
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A solid state miniature condenser and condenser microphone of good sensitivity is disclosed. The microphone comprises a fixed perforated backplate that constitutes a fixed electrode in a parallel plate condenser, a diaphragm sensitive to incident sound pressure waves that constitutes a moveable plate in the parallel plate condenser, keepers to position the diaphragm in relationship to the backplate without applying appreciable tension to the diaphragm, and FET circuitry which provides an output proportional to the change in capacitance of the condenser when the diaphragm moves in relationship to the backplate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.