Electromagnetic transducer having a low reluctance return path
US7065225B2 · kind B2 · utility
10Cited by
2References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 13, 2005 |
| Grant date | Jun 20, 2006 |
| Priority date | — |
| Expiry date | Apr 13, 2025 |
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, includes a return path member which is a pole piece for external magnet geometries or a cup for internal magnet geometries. The magnetic flux return path for the primary drive magnet is through a first portion of the return path member. A first section of a low reluctance magnetic flux return path for a secondary drive magnet is through a second portion of the return path member. A magnetically conductive plate provides a second section of the low reluctance return path from the second portion of the return path member to the secondary drive magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.