发明名称 |
Objective lens driving apparatus |
摘要 |
From the start of descending of a disk-shaped recording medium in a direction of approaching an objective lens in the optical axis direction by a loading mechanism until it is set at a specified position with respect to a spindle motor, a DC current is supplied to an optical axis direction driving coil through an evading current feeding circuit in a direction for a movable part to depart from the disk-shaped recording medium, and the movable part is located at the remotest position from the disk-shaped recording medium due to an electromagnetic force generated by the DC current flowing in the optical axis direction driving coil and a permanent magnet, so that the disk-shaped recording medium and the objective lens will not collide against each other even if an objective lens with a short working distance is used.
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申请公布号 |
US5224083(A) |
申请公布日期 |
1993.06.29 |
申请号 |
US19900556000 |
申请日期 |
1990.07.16 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
WAKABAYASHI, KANJI;TOMITA, HIRONORI;NAKAMURA, TOHRU;KIKUCHI, NOBORU |
分类号 |
G11B7/085 |
主分类号 |
G11B7/085 |
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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