Electroacoustic transducer
US6373959B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2001 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Aug 13, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electroacoustic transducer 1 is provided with a diaphragm 20 which is made of a magnetic material, and to which a magnetic piece 21 is fixed; a magnetic core 22 which is placed in proximity to the diaphragm 20; a coil 23 which supplies an oscillating magnetic field to the magnetic core 22; a housing 10 which accommodates the diaphragm 20, the magnetic core 22, and the coil 23, and which has a sound release opening 11 in a top plate opposed to the diaphragm 20, the sound release opening being larger than the magnetic piece 21. A beam portion 12 is formed integrally with the housing 10 which extends from a peripheral portion of the sound release opening 11 to another peripheral portion passing above the magnetic piece 21. A gap Ga between the diaphragm 20 and the magnetic core 22, and a gap Gb between the magnetic piece 21 and the beam portion 12 satisfy relationships of Ga≦Gb≦5Ga.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.