1992-04-16
1995-03-28
Gellner, Michael L.
G03B 1336
Patent
active
054021987
ABSTRACT:
A focus detecting apparatus for detecting the focus of a photo-taking lens comprises a condenser lens disposed near the predetermined image plane of an object formed by the photo-taking lens, and a plurality of focus detection systems. Each of the focus detection systems comprises pupil dividing means disposed rearwardly of the condenser lens in the direction of the optical axis thereof and having at least one pair of openings for dividing the pupil of the photo-taking lens, at least one pair of re-imaging lenses disposed rearwardly of the pupil dividing means correspondingly to the at least one pair of openings for forming at least one pair of secondary images, and a photoelectric conversion element array having picture elements for detecting the amount of deviation of the relative position of the secondary images. The area of a picture element of the photoelectric conversion element array in each of the focus detection systems is determined in conformity with the area of the openings in the pupil dividing means in that focus detection system.
REFERENCES:
patent: 5029998 (1991-07-01), Utagawa et al.
patent: 5130735 (1992-07-01), Kusaka et al.
patent: 5160834 (1992-11-01), Moriyama
Gellner Michael L.
Nikon Corporation
Noh Jae N.
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