Electret transducer with variable electret foil thickness
US4429192A · kind A · utility
9Cited by
3References
10Claims
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 acoustic transducer for producing highly directional characteristics comprises a metalized backplate (130) facing the flat surface (134) of an electrostatically charged electret foil (132). The thickness of the electret foil varies along the length thereof according to a predetermined relationship. The sensitivity of the electret transducer varies directly with the thickness of the electret foil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.