Multifunction acoustic device
US6834114B2 · kind B2 · utility
6Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2002 |
| Grant date | Dec 21, 2004 |
| Priority date | — |
| Expiry date | Nov 23, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R11/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A rotor having a yoke is rotatably supported in a frame, and a stator provided in the frame at a central portion of the frame. An annular first permanent magnet is provided on the yoke, and an annular second permanent magnet is provided on the yoke. A diaphragm is supported in the frame, and a voice coil is secured to the diaphragm and inserted in a gap formed by the first permanent magnet. At least two coils are provided on the stator for forming magnetic fluxes between the rotor and the stator so as to rotate the rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.