Loud speaker with minimized magnetic leakage
US4421956A · kind A · utility
4Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1981 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Sep 29, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2209/022
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A loudspeaker is provided which has a novel integrally formed back plate and pole-piece. The back plate and pole-piece has an annular portion and a toroidal portion. The result is a marked reduction in magnetic leakage caused by reluctance due to interfaces and corners.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.