Multifunction acoustic device
US6621911B2 · kind B2 · utility
3Cited by
1References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2001 |
| Grant date | Sep 16, 2003 |
| Priority date | — |
| Expiry date | Dec 4, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2400/03
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker diaphragm having a voice coil secured thereto is provided in a frame, a rotor having a permanent magnet is rotatably supported in the frame, and a stator having poles is provided in the frame. The permanent magnet provided on the rotor is provided 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.