Electro-acoustic transducer
US9154884B2 · kind B2 · utility
5Cited by
16References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 2014 |
| Grant date | Oct 6, 2015 |
| Priority date | — |
| Expiry date | Jul 30, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2400/03
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electro-acoustic transducer includes a frame, a magnet circuit unit accommodated in the frame, and a vibration unit engaging with the frame. The magnetic circuit unit includes a lower plate, a main magnet positioned centrally on the lower plate, a pair of auxiliary magnets positioned spaced from the main magnet for forming a magnetic gap, and a pair of upper plates attached to the auxiliary magnets, respectively. Each upper plate includes a base body integrated with the frame, and a restricting part extending from the base body and engaging with an inner surface of the auxiliary magnet facing the main magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.