发明名称 |
Piezoelectric electroacoustic transducer |
摘要 |
An electroacoustic transducer, such as a microphone or a telephone receiver, comprises a thermoplastic body with a central plateau surrounded by an annular recess from which an elastic ring projects slightly above the plateau to support a membrane in the form of sheet-metal foil carrying a piezoceramic layer. The body is overlain by a thermoplastic cover which has apertures for the passage of sound waves and is formed with an internal annular rib registering with the elastic ring to clamp the rim of the membrane therebetween. The body, the cover and a thermoplastic base are joined together by ultrasonic welding.
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申请公布号 |
US4063049(A) |
申请公布日期 |
1977.12.13 |
申请号 |
US19760755208 |
申请日期 |
1976.12.29 |
申请人 |
SOCIETA ITALIANA TELECOMUNICAZIONI SIEMENS S.P.A. |
发明人 |
PIPITONE, ROBERTO;GNOCCHI, COLOMBO |
分类号 |
H04R7/22;H04R17/00;(IPC1-7):H04R17/00 |
主分类号 |
H04R7/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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