Magnetic circuit for loudspeaker, and loudspeaker using same
US9277304B2 · kind B2 · utility
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23Claims
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Key dates
| Filing date | Aug 7, 2014 |
| Grant date | Mar 1, 2016 |
| Priority date | — |
| Expiry date | Aug 7, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2209/024
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The loudspeaker magnetic circuit is an external-magnet type, and has a magnet, an upper plate, and a lower plate. The magnet is sandwiched between the upper plate and the lower plate. At least one of the lower plate and the upper plate is formed of magnetic powder or a mixture of a magnetic powder and resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.