发明名称 |
Objective lens driving device capable of holding an objective lens at a specific neutral point |
摘要 |
An objective lens driving device includes drive coils mounted on one of a lens holder bearing an objective lens and a stationary member; magnets mounted on the other in such a manner that said drive coils are confronted with the magnets, and the lens holder is moved in a focusing direction and a tracking direction by application of current to the drive coils; and magnetic pieces arranged in magnetic circuits including the magnets, so that magnetic attraction forces acting on the magnetic pieces produce restoring forces two-dimensionally in the focusing direction and in the tracking direction to hold the objective lens at a neutral point. The magnetic pieces are so arranged that, at the neutral point, the drive coils are confronted straightly with the magnets.
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申请公布号 |
US5844881(A) |
申请公布日期 |
1998.12.01 |
申请号 |
US19950494224 |
申请日期 |
1995.06.23 |
申请人 |
KABUSHIKI KAISHA SANKYO SEIKI SEISAKUSHO |
发明人 |
KASUGA, IKUO;KOBAYASHI, FUMIO;KAMADA, TORU;OKUMURA, AKIHIKO |
分类号 |
G11B7/09;(IPC1-7):G02B7/02;G11B21/10 |
主分类号 |
G11B7/09 |
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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