Focus detector having light deflector near image forming plane

Details Focus detector having light deflector near image forming plane Focus detector having light deflector near image forming plane

1998-01-08

1999-12-14

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

396114, G01J 120, G03B 300

Patent

active

060021217

ABSTRACT:
To perform accurate focus detection using a wide range of injected luminous flux from a photographic lens, a deflecting plate, which deflects the injected luminous flux of the photographic optical system in the vertical direction with respect to the direction of a pair of entrance pupils of a focus detecting optical system, is provided at, or near, a predetermined image forming plane of the photographic optical system. By this structure, the entrance pupils of the focus detecting optical system can be spread in a direction vertical to the focus detecting direction, and the focus detecting accuracy can be improved by using a wider range of the injected luminous flux of the focus detecting optical system.

REFERENCES:
patent: 4659917 (1987-04-01), Suzuki et al.
patent: 4992818 (1991-02-01), Karasaki et al.
patent: 5212514 (1993-05-01), Goto
patent: 5678097 (1997-10-01), Suda
patent: 5839001 (1998-11-01), Ohtaka et al.

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