Electroacoustic transducer
US6804369B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2001 |
| Grant date | Oct 12, 2004 |
| Priority date | — |
| Expiry date | Oct 23, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electroacoustic transducer 1 includes a base 24 made of a magnetic material; a magnetic core 22 made of a magnetic material and upstanding on the base 24; a diaphragm 20 made of a magnetic material and spaced from a leading end of the magnetic core; a magnetic field generating member 25 cooperating with the base 24, the magnetic core 22 and the diaphragm 20 to constitute a magnetic circuit, for supplying a static magnetic field; a coil 23 placed around the magnetic core, for supplying an oscillating magnetic field to the magnetic circuit. The magnetic field generating member 25 constitutes a multiplex ring structure in which a magnet 25a and a support ring 26 are integrated together, whose faces opposing the diaphragm 20 have respectively magnetic poles of the same polarity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.