发明名称 |
Multi-point autofocus system |
摘要 |
Amulti-point autofocus system includes a focus detection device which can calculate a defocus amount for each of a plurality of focus detection zones in a picture plane; a selecting device for manually selecting a focus detection zone from the plurality of focus detection zones for which the defocus amount is to be calculated by the focus detection device; and a determining device for determining a valid focus detection zone by which a valid defocus amount can be calculated out of at least one of the plurality of focus detection zones other than the manually-selected focus detection zone, in such a manner that a higher priority is given to a focus detection zone than another focus detection zone of the plurality of focus detection zones in the case where the result of a calculation of the defocus amount of the manually-selected focus detection zone is invalid.
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申请公布号 |
US2002021897(A1) |
申请公布日期 |
2002.02.21 |
申请号 |
US20010897950 |
申请日期 |
2001.07.05 |
申请人 |
ASAHI KOGAKU KOGYO KABUSHIKI KAISHA OF |
发明人 |
NAKATA MASAHIRO |
分类号 |
G02B7/28;G02B7/34;G03B13/36;(IPC1-7):G03B13/34 |
主分类号 |
G02B7/28 |
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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