Electro-acoustic transducer unit
US4949387A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1989 |
| Grant date | Aug 14, 1990 |
| Priority date | — |
| Expiry date | Jun 8, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/11
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electro-acoustic transducer unit for use either as a microphone, a receiver or a voice frequency ringing transducer has a transducer plate fastened between bearing members provided with a piezo-electric layer. By carefully dimensioning the resonator chambers in front of and behind the transducer plate and providing one resonator space with a neck closed by a covering, which is removable, the transducer may be used as a receiver or a microphone or, by removal of the covering, may be used as a voice frequency ringing transducer. The transducer unit is particularly applicable as an electro-acoustic transducer in telephone technology.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.