发明授权
- 专利标题： Electromagnetic transducer and portable communicating device
- 专利标题（中）： 电磁换能器和便携式通讯装置
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申请号： US09980995申请日： 2001-11-07
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公开(公告)号： US06658133B1公开(公告)日： 2003-12-02
- 发明人: Sawako Usuki , Shuji Saiki
- 申请人： Sawako Usuki , Shuji Saiki
- 优先权： JP11-133813 19990514; JP11-347129 19991207
- 主分类号： H04R2500
- IPC分类号： H04R2500
摘要：
An electromagnetic transducer according to the present invention includes: a first diaphragm disposed so as to be capable of vibration; a second diaphragm disposed in a central portion of the first diaphragm, the second diaphragm being made of a magnetic material; a yoke disposed so as to oppose the first diaphragm; a center pole disposed between the yoke and the first diaphragm; a coil disposed so as to surround the center pole; a first magnet disposed so as to surround the coil; and a second magnet disposed on an opposite side of the first diaphragm from the center pole.
信息查询
