Automatic focus detection system

Details Automatic focus detection system Automatic focus detection system

1987-09-22

1989-06-27

Adams, Russell E.

Optics: measuring and testing

Range or remote distance finding

With photodetection

3541951, 356 1, G03B 300

Patent

active

048434159

ABSTRACT:
An automatic focus detection system for use in a camera system comprises focus detecting unit having one light receiving element corresponding to, in an objective field, a focus detection area whose center is deviated from the optical axis of the objective lens, the position of the focus detection area being changed in accordance with the change of the focal length of the objective lens; and a light projecting unit for projecting light towards the object field so that the region of the projected light covers the focus detection area, if the position of the focus detection area is changed in accordance with the change of the focal length of the objective lens.

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