Speaker diaphragm and its manufacturing method
US8851228B2 · kind B2 · utility
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5References
6Claims
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Key dates
| Filing date | Jul 11, 2013 |
| Grant date | Oct 7, 2014 |
| Priority date | — |
| Expiry date | Jul 11, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2307/023
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker diaphragm structure includes a speaker diaphragm and a coating formed on the speaker diaphragm and is composed of at least one dense layer and relatively porous layer alternately arranged with respect to the at least one dense layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.