Electret transducer with variably charged electret foil
US4429191A · kind A · utility
5Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1981 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | Nov 20, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49226
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electret transducer for producting a highly directional response characteristic comprises a backplate (18) and, superimposed thereon, an electrostatically charged electret foil (10). The electrostatic charge varies according to a predetermined relationship. The sensitivity of the electret transducer, at any point thereon, is directly proportional to the electrostatic charge on the electret foil at that point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.