Speaker
US8139811B2 · kind B2 · utility
3Cited by
1References
14Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 17, 2006 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Dec 5, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R7/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker 1 includes: a frame 4; a magnetic circuit 2; and a vibrating unit 3. The magnetic circuit 2 is attached to the frame 4. The vibrating unit 3 is received in the frame 4, and includes a drive cone 14 and a diaphragm 15 vibrated by the magnetic circuit 2. A space surrounded by the drive cone 14, the diaphragm 15 and the frame 4 is sealed. An edge unit 17 is attached to an outer edge of the drive cone 14. The edge unit 17 is in an arc sectional shape, and integrally includes two roll parts 47 arranged coaxially to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.