发明名称 |
Electro-acoustic transducer having a diaphragm comprising a layer of polymethacrylimide foam. |
摘要 |
<p>An electro-acoustic transducer has a diaphragm which comprises a layer of a polymethacrylimide foam having a modulus of elasticity between 15.106 and 120.106 N/m2 and a density between 10 and 80 kg/m3. If the diaphragm is of a sandwich construction, the core layer is made of said polymethacrylimide foam and the skin layers are made of glass fibres, carbon fibres, cellulose fibres or polyaramide fibres. This results in a transducer having a higher efficiency and a lower distortion.</p> |
申请公布号 |
EP0087177(A1) |
申请公布日期 |
1983.08.31 |
申请号 |
EP19830200138 |
申请日期 |
1983.01.27 |
申请人 |
N.V. PHILIPS' GLOEILAMPENFABRIEKEN |
发明人 |
GOOSSENS, URBANUS PAUL MARGUERITE |
分类号 |
H04R9/04;B32B3/26;H04R7/02;H04R7/08;H04R7/10;(IPC1-7):04R7/02;04R7/10 |
主分类号 |
H04R9/04 |
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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