发明名称 |
Loudspeaker with burning resistant diaphragm |
摘要 |
The invention discloses a loudspeaker with a diaphragm made of pulp fibers treated with a chemical condensation product of an ammonium salt of a polyphosphoric acid having a high degree of condensation with polyethyleneimine. The diaphragm has burning resistance, and the deterioration of acoustic characteristics may be prevented.
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申请公布号 |
US4086449(A) |
申请公布日期 |
1978.04.25 |
申请号 |
US19760739141 |
申请日期 |
1976.11.05 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
TAKANO, KAZURO |
分类号 |
H04R7/02;H04R7/12;(IPC1-7):H04R7/00;G10K13/00;C09K3/28 |
主分类号 |
H04R7/02 |
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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