发明名称 |
Electret microphone with simplified electrical connections by printed circuit board mounting |
摘要 |
A telephone transmitter sub-assembly has an electret clamped between a pair of printed circuit boards. The electret conducting surface and printed circuit patterns on the boards have an overlapping arrangement at a planar junction. The arrangement connects a capacitor, of which the electret forms part, into an amplifying circuit.
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申请公布号 |
US4188513(A) |
申请公布日期 |
1980.02.12 |
申请号 |
US19780957539 |
申请日期 |
1978.11.03 |
申请人 |
NORTHERN TELECOM LTD |
发明人 |
DRAGUNEVICIUS, ALGIRDAS J;GUMB, BEVERLEY W;MORRELL, RONALD J |
分类号 |
H04R19/00;H04R19/01;H05K1/14;(IPC1-7):H04R19/04 |
主分类号 |
H04R19/00 |
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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