发明名称 |
Electret transducer with variable electret foil thickness |
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.
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申请公布号 |
US4429192(A) |
申请公布日期 |
1984.01.31 |
申请号 |
US19810323696 |
申请日期 |
1981.11.20 |
申请人 |
BELL TELEPHONE LABORATORIES, INCORPORATED |
发明人 |
BUSCH-VISHNIAC, ILENE J.;WALLACE, JR., ROBERT L.;WEST, JAMES E. |
分类号 |
H04R19/00;G01H11/06;G10K11/32;H04R19/01;(IPC1-7):H04R19/00 |
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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