发明名称 |
DÜNNER ELEKTROMAGNETISCHER WANDLER |
摘要 |
A thin electromagnetic transducer includes a permanent magnetic plate, a vibratory diaphragm disposed in opposing relation to the permanent magnetic plate, a resilient buffer member interposed between the vibratory diaphragm and the permanent magnetic plate, and a support member for regulating the position of the vibratory diaphragm relative to the permanent magnetic plate. The permanent magnetic plate is of rigid structure, having a parallel striped multipolar magnetized pattern and a plurality of air-discharge through-holes are arranged in neutral zones of the magnetized pattern. The vibratory diaphragm is formed of a thin and soft resin film on which a coil is formed by printing. A linear portion of the conductor pattern is disposed in a position corresponding to the neutral zones of the permanent magnetic plate, and the vibratory diaphragm is supported by such that the vibratory diaphragm can displace in a thickness-wise direction. The resilient buffer member is formed of generally same sized sheets as the vibratory diaphragm, which are soft and have high air-permeability. <IMAGE> |
申请公布号 |
DE69728170(D1) |
申请公布日期 |
2004.04.22 |
申请号 |
DE1997628170 |
申请日期 |
1997.11.13 |
申请人 |
A-PRO INTERNATIONAL LTD., HAMAMATSU |
发明人 |
A-PRO INTERNATIONAL LIMITED, HAMAMTSU CITY |
分类号 |
H04R13/00;H04R7/18;H04R9/00;H04R9/04 |
主分类号 |
H04R13/00 |
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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