发明名称 |
Light measuring device |
摘要 |
A light measuring device in which the field of a photometric system is divided into a plurality of areas, and the outputs of these areas are computed based on the one of various formulae which is selected depending on the relative size of the subject image to the total field as the focal length of a photographic lens varies, to obtain an exposure value.
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申请公布号 |
US4912495(A) |
申请公布日期 |
1990.03.27 |
申请号 |
US19880198650 |
申请日期 |
1988.05.24 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
ISHIKAWA, MASANORI;YAMADA, AKIRA;KIYOHARA, SHUICHI;SHIMIZU, MASAO;AIHARA, YOSHIHIKO |
分类号 |
G03B7/091;G03B7/099;G03B7/20;G03B7/28 |
主分类号 |
G03B7/091 |
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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