Camera having an automatic focus control apparatus

Details Camera having an automatic focus control apparatus Camera having an automatic focus control apparatus

1978-09-07

1980-08-12

Gellner, Michael L.

G03B 300

Patent

active

042170435

ABSTRACT:
An automatic focus control apparatus for a camera lens which includes a fixed and a movable optical system, each adapted to form an image of an object to be photographed on a respective photosensitive means. The movable optical system includes a rotatable mirror movable successively in opposite directions, in the first direction at a high rate of speed, and in the second direction at a low rate of speed simultaneously with lens adjustment. Signal processing means compares the signals provided by the photosensitive means and stops the lens and operates a camera shutter during movement of the mirror in the second direction when a maximum or minimum output signal compares with a selected maximum or minimum output signal generated during movement of the mirror in the first direction.

REFERENCES:
patent: 4075639 (1978-02-01), Peterson

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