Focus detection device for a camera

Details Focus detection device for a camera Focus detection device for a camera

1986-06-24

1988-05-10

Adams, Russell E.

Optical: systems and elements

Prism

With reflecting surface

359407, G03B 300

Patent

active

047439327

ABSTRACT:
A focus detection system for a camera, especially for a single lens reflex camera, is disclosed.
The focus detection system comprises a light projection means for illuminating an object at the active AF and means for switching positions and/or sizes of iris apertures for focus detection according to the type, F-number, focal length, shift amount etc., of an interchangeable lens assembly in order to remove possible light beams such as flares and ghosts generated by surface reflections due to lenses comprising the interchangeable objective lens.

REFERENCES:
patent: 4357085 (1982-11-01), Niwa et al.
patent: 4511232 (1985-04-01), Yamada
patent: 4549802 (1985-10-01), Ohtaka
patent: 4561748 (1985-12-01), Omaki et al.
patent: 4571047 (1986-02-01), Hirai
patent: 4618235 (1986-10-01), Ishida et al.
patent: 4632532 (1986-12-01), Matsumura et al.
patent: 4690538 (1987-09-01), Matsui et al.

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