Multifunction acoustic device
US6766034B2 · kind B2 · utility
4Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2001 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Jul 16, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2400/03
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker vibrating plate having a voice coil secured thereto is provided in a frame, a rotor having an annular side yoke is rotatably supported in the frame, and a stator having poles is provided in the frame. A first permanent magnet is provided on the rotor at a central portion thereof, and an annular second permanent magnet is mounted on the rotor outside the side yoke for forming a magnetic circuit passing through the rotor and the stator, and a stator coil is provided in the stator. A driving circuit is provided for energizing the stator coil for rotating the rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.