Electret diaphragm and speaker using the same
US8503702B2 · kind B2 · utility
5Cited by
5References
21Claims
0Family size
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Inventors
Key dates
| Filing date | Oct 22, 2010 |
| Grant date | Aug 6, 2013 |
| Priority date | — |
| Expiry date | Aug 16, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/13
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electret diaphragm and a speaker using the same are provided. The electret diaphragm includes an electret layer, a bonding layer adhered to a surface of the electret layer, and an aluminum (Al) electrode layer adhered on the bonding layer. The electret layer at least includes ethylene group polymer. A material of the bonding layer is ethylene-ethyl-acrylate (EEA) or ethylene-vinyl acetate (EVA).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.