Electret bistable system
US4205242A · kind A · utility
12Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1978 |
| Grant date | May 27, 1980 |
| Priority date | — |
| Expiry date | Jan 3, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2059/009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to electret bistable systems comprising two fixed electrodes forming a capacitor. A sheet of electret material is inserted for creating holding forces in two rest positions of a moving element located in the capacitor gap. In accordance with the invention, the electret sheet is separated from the corresponding fixed electrode by a layer of dielectric which can be an air gap. As a variant, the charge density of the electret sheet may be concentrated in islands for reducing the holding forces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.