Electretization method and apparatus
US8073166B2 · kind B2 · utility
3Cited by
1References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2007 |
| Grant date | Dec 6, 2011 |
| Priority date | — |
| Expiry date | Oct 6, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/3025
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
While a dielectric film is set to have a ground potential, a fixed electrode is set to have a different potential from the ground potential. Thereafter, ions produced by corona discharge are allowed to pass through a plurality of acoustic holes formed in the fixed electrode and reach the dielectric film, thereby electretizing the dielectric film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.