发明名称 |
AKUSTISK OMVANDLARE MED ETT RIKTNINGSDIAGRAM INNEHALLANDE EN HUVUDLOB OCH ETT FLERTAL I HUVUDSAK VID EN FORUTBESTEMD TROSKELNIVA LIGGANDE SIDOLOBER |
摘要 |
An acoustic transducer for producing highly directional characteristics comprises a metalized backplate (130) facing the flat surface (134) of an electrostatically charged electret foil (132). The thickness of the electret foil varies along the length thereof according to a predetermined relationship. The sensitivity of the electret transducer varies directly with the thickness of the electret foil. |
申请公布号 |
SE453349(B) |
申请公布日期 |
1988.01.25 |
申请号 |
SE19820006383 |
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;G10K11/32;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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