Automatic focus control device for use in a camera system

Details Automatic focus control device for use in a camera system Automatic focus control device for use in a camera system

1989-07-05

1990-02-13

Adams, Russell E.

354406, G03B 300

Patent

active

049011014

ABSTRACT:
In an automatic focus detection device for use in a camera, a focus condition detecting unit detects a focus condition of a photographic lens in a camera based on the output of a light receiving device and calculates the amount of defocus of the photographic lens. An auxiliary light emitting device emits auxiliary light and comparator compares the stored output of memory and the output of the light receiving device under the ambient light; and then the detected defocus amount under the auxiliary light emission is corrected in accordance with the result of comparison so as to eliminate the bad effect of the color aberration of the lens of the camera, whereby a correct focus position can be detected.

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