发明名称 |
Optical element driving device having two permanent magnets and one magnetic substance |
摘要 |
Tracking coils are fixed on side surfaces of a lens holder and a magnetic substance of axisymmetric shape is fixed on a lower surface of the lens holder, being sandwiched by a focusing coil. Moreover, end portions of the magnetic substance are opposed to respective N-pole surfaces of permanent magnets serving as a focusing driving device and a tracking driving device together with the above coils. As a result, a neutral position holding system for an objective lens can be formed of these permanent magnets and the magnetic substance.
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申请公布号 |
US6839899(B2) |
申请公布日期 |
2005.01.04 |
申请号 |
US20020265251 |
申请日期 |
2002.10.07 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
TAKESHITA NOBUO;YABE MITORU |
分类号 |
G02B7/08;G11B7/09;G11B7/22;(IPC1-7):G11B7/09 |
主分类号 |
G02B7/08 |
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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