发明名称 |
Electret capacitor microphone |
摘要 |
To provide an electret capacitor microphone in which change of sensitivity characteristic caused by thermal deformation of an electret layer can be prevented even in the case where a reflow process is carried out. An electret capacitor microphone includes: an electret capacitor portion including a diaphragm, and a back electrode plate disposed opposite to the diaphragm through a spacer; an electrically insulating bush for electrically insulating/supporting an outer circumferential edge portion of the back electrode plate; a metal cover in which the electret capacitor portion and the electrically insulating bush are stored; and a gate spring having a pressing function for elastically pressing the back electrode plate toward the diaphragm to form a predetermined gap between the electrically insulating bush and an inner surface of a rear wall of the metal cover. Consequently, collapse of a spacer-abutting portion of an electret layer is prevented from being caused by thermal expansion.
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申请公布号 |
US2005002538(A1) |
申请公布日期 |
2005.01.06 |
申请号 |
US20040882290 |
申请日期 |
2004.07.02 |
申请人 |
STAR MICRONICS CO., LTD. |
发明人 |
YONEHARA KENTARO;ITO MOTOAKI;FUJINAMI HIROSHI;IMAHORI YOSHIO |
分类号 |
H04R19/01;(IPC1-7):H04R9/08;H04R21/02;H04R25/00 |
主分类号 |
H04R19/01 |
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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