| 发明名称 |
Automatic focusing device |
| 摘要 |
In the disclosed automatic focusing device for a zoom lens the in-focus position for a particular object distance varies with changes in the focal length. The device detects the amount of variation of the focal length of the zoom lens, and continuously drives the focusing lens.
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| 申请公布号 |
US4705380(A) |
申请公布日期 |
1987.11.10 |
| 申请号 |
US19860910342 |
申请日期 |
1986.09.19 |
| 申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
YAMAMOTO, HIROSHI;AKASHI, AKIRA |
| 分类号 |
G02B7/08;G02B7/10;G02B7/28;G02B15/14;G02B15/22;G03B13/36;(IPC1-7):G03B3/10 |
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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