Electroacoustic converter having a recessed step on the center pole
US4752963A · kind A · utility
20Cited by
11References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1986 |
| Grant date | Jun 21, 1988 |
| Priority date | — |
| Expiry date | Jun 9, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/025
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an electroacoustic converter, center pole and top plate which constitute a magnetic circuit are mechanically abutted against each other by interposing an air gap defining member therebetween. The air gap defining member is a projection provided on the center pole or top plate, otherwise non-magnetic ring-like sleeve covered on the center pole or top plate. An air gap in the magnetic circuit can be precisely defined by the air gap defining member without using any alignment tool in its assemble process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.