发明名称 |
Electromagnetic transducer and portable communication device |
摘要 |
An electromagnetic transducer includes: a first diaphragm; a second diaphragm provided in a central portion of the first diaphragm, the second diaphragm comprising a magnetic material having a first opening in a central portion thereof; a yoke disposed so as to oppose the first diaphragm; a center pole disposed between the yoke and the first diaphragm, wherein the center pole has a shape which allows insertion into the first opening; a coil disposed so as to surround the center pole; and a first magnet disposed so as to surround the coil.
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申请公布号 |
US6920230(B2) |
申请公布日期 |
2005.07.19 |
申请号 |
US20010980325 |
申请日期 |
2001.11.30 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
USUKI SAWAKO;SAIKI SHUJI |
分类号 |
H04R13/02;(IPC1-7):H04R25/00 |
主分类号 |
H04R13/02 |
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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