发明名称 |
AKUSTISK OMVANDLARE INNEFATTANDE EN ELEKTRETFOLIE OCH EN MOTELEKTRODPLATTA MED EN METALLYTA |
摘要 |
An electret transducer for producing a directional response, electret foil (92) and a backplate (94) with the actual air gap thickness therebetween varying in accordance with a predetermined relationship. The sensitivity of the electret transducer varies inversely as the actual air gap thickness. In one embodiment the actual air gap thickness is realized by a plurality of posts (90) having heights varying according to the aforesaid relationship. In another embodiment, the actual air gap thickness is realized by varying the thickness of the aforesaid backplate. |
申请公布号 |
SE454124(B) |
申请公布日期 |
1988.03.28 |
申请号 |
SE19820006382 |
申请日期 |
1982.11.10 |
申请人 |
WESTERN ELECTRIC COMPANY INCORPORATED |
发明人 |
I J * BUSCH-VISHNIAC;R L * WALLACE JR;J E * WEST |
分类号 |
H04R19/00;G01H11/06;H04R19/01;(IPC1-7):H04R19/01 |
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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