Electret microphone with simplified electrical connections by printed circuit board mounting
US4188513A · kind A · utility
15Cited by
0References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1978 |
| Grant date | Feb 12, 1980 |
| Priority date | — |
| Expiry date | Nov 3, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R19/016
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A telephone transmitter sub-assembly has an electret clamped between a pair of printed circuit boards. The electret conducting surface and printed circuit patterns on the boards have an overlapping arrangement at a planar junction. The arrangement connects a capacitor, of which the electret forms part, into an amplifying circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.