Electromagnetic transducer having multiple magnetic air gaps whose magnetic flux is in a same direction
US6917690B2 · kind B2 · utility
4Cited by
2References
31Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 9, 2004 |
| Grant date | Jul 12, 2005 |
| Priority date | — |
| Expiry date | Sep 9, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2209/022
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electromagnetic transducer such as an audio speaker exhibiting highly linear performance over a greatly extended excursion. The motor structure includes a stack of two or more magnet and plate pairs, with the magnets polarized in the same orientation such that the magnetic flux flows in the same direction over all of the magnetic air gaps. The voice coil is handed off from gap to gap with a configuration providing a substantially constant BL over an end-to-end distance at least as large as the thickness of one plate plus twice the thickness of one magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.