发明名称 |
Lens drive control apparatus |
摘要 |
A lens drive control apparatus includes a movable lens which is movable along the optical axis; a lens driver; a code plate having two limit positions respectively serving as mechanical movement limit positions of the movable lens, the code plate including first and second codes; a code detector which moves together with the movable lens; a pulse generator which generates pulses according to the movement of the movable lens; a pulse counter; and a position determining device which determines an absolute position of the first code detected by the code detector, based on the number of pulses counted by the pulse counter from the time when the code detector detects the first or second code until the time when the code detector detects the subsequent other of the second code or first code.
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申请公布号 |
US2002025151(A1) |
申请公布日期 |
2002.02.28 |
申请号 |
US20010939564 |
申请日期 |
2001.08.28 |
申请人 |
ASAHI KOGAKU KOGYO KABUSHIKI |
发明人 |
NUMAKO NORIO;NAKAHARA NAOTO |
分类号 |
G02B7/08;G03B17/00;(IPC1-7):G03B17/00 |
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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