Unidirectional electret microphone
US4456796A · kind A · utility
74Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1982 |
| Grant date | Jun 26, 1984 |
| Priority date | — |
| Expiry date | Mar 18, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R19/016
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A partition wall is held in contact with a back electrode on the opposite side from a diaphragm, and a fine acoustic path is formed in at least one of the contact surfaces of the partition wall and the back electrode. The acoustic path communicates with a sound hole made in the back electrode and a sound hole made in the partition wall. The velocity component of sound reaching the back of the diaphragm is controlled by the fine acoustic path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.