Focus detection device

Details Focus detection device Focus detection device

1986-06-24

1988-05-24

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354403, 250201, C03B 300

Patent

active

047469480

ABSTRACT:
A focus detection device for a camera, especially for a single lens reflex camera is disclosed.
The focus detection device provides a light measuring means for measuring the color temperature of light beams being incident thereinto and a correction means for correcting the color temperature of said incident light for focus detection so as to have a predetermined constant color temperature. This correction removes possible errors in focus detection due to the chromatic aberration of an objective lens.

REFERENCES:
patent: 4571047 (1986-02-01), Hirai
patent: 4634255 (1987-01-01), Suda et al.

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