Electromechanical transducers
US4250415A · kind A · utility
34Cited by
2References
16Claims
0Family size
Inventors
Key dates
| Filing date | Jun 29, 1978 |
| Grant date | Feb 10, 1981 |
| Priority date | — |
| Expiry date | Jun 29, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N1/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to electromechanical transducers comprising an electret 4 between two electricity conducting electrodes 1 and 2. A solid intermediate layer 7 having a different deformability from that of the electret is placed between said electret and an electrode, the material forming said layer having an electrical resistivity higher than 10.sup.15 ohms.cm (for instance a silicone elastomer) and said layer having a smooth and continuous face in intimate contact with the whole of the useful area of the charged face of the electret.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.