1992-10-20
1993-11-02
Gellner, Michael L.
G03B 300
Patent
active
052588017
ABSTRACT:
A focus detecting device comprises an image forming optical system, a device for detecting the defocus amount with respect to a predetermined plane of a plurality of images, formed by the image forming optical system, of fields corresponding to a plurality of detection areas which are set beforehand, a device for classifying the plurality of detection areas into a plurality of groups on the basis of the defocus amount, a device for selecting one optimum group from the plurality of groups, and a device for determining one final defocus amount on the basis of the defocus amount corresponding to detection areas belonging to the optimum group.
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Kusaka Yosuke
Kuwata Chiyuki
Uchiyama Shigeyuki
Utagawa Ken
Yamano Shozo
Gellner Michael L.
Nikon Corporation
Spyrow Cassandra C.
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