Speaker containing dual coil
US5832096A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 1997 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Sep 4, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A loudspeaker including a voice coil and a counter coil connected in series to receive speaker signals. The counter coil is wrapped on the pole pieces in an opposite direction to the voice coil such that a first magnetic field generated by the voice coil is reduced by a second magnetic field generated by the counter coil. In addition, a stiffened and/or elongated voice coil support is provided to reduce distortion caused by a bowing effect of the voice coil due to a warped stationary magnetic field located in the air gap. An acoustically-transparent basket is also provided which minimizes reflected sound waves to further reduce distortion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.