Induction speaker
US5062140A · kind A · utility
27Cited by
7References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1989 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | Apr 18, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2209/043
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a speaker which comprises a diaphragm having a vibrating portion and an annular conductive portion, a current feeding coil facing the conductive portion with a predetermined gap therebetween, and a magnetic circuit including a top plate, a magnet and a yoke plate to which the current feeding coil is attached; the diaphragm is formed so that an electrical resistance of its conductive portion is lower than an electrical resistance of its vibrating portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.