| 摘要 |
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.
|
