Focus state detecting system

Details Focus state detecting system Focus state detecting system

1985-09-20

1987-08-25

Perkey, W. B.

G03B 300

Patent

active

046889205

ABSTRACT:
A system for detecting the focus of an imaging lens relative to an object includes re-imaging means disposed on the imaging side of the imaging lens and having pupil dividing means for dividing the pupil of the imaging lens into a plurality of areas, the re-imaging means forming a secondary object image of the object from a light beam passed through the plurality of divided areas, an optical system disposed near the predetermined imaging plane of the imaging lens and having a reflecting surface for directing a primary object image of the object to the re-imaging means, and light-receiving means on which the secondary object image by the re-imaging means is formed.

REFERENCES:
patent: 3860935 (1975-01-01), Stauffer
patent: 4357086 (1982-11-01), Shimomura et al.
patent: 4552445 (1985-11-01), Mukai et al.

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