Focusing controlling device

Details Focusing controlling device Focusing controlling device

1983-11-18

1986-03-04

Hix, L. T.

G03B 310

Patent

active

045737835

ABSTRACT:
A focusing control for a camera which uses a reflected beam of light to control extension of the lens. The reflected light beam is received by a photodetector having two aligned photodetectors which are movable with the camera lens. The circuitry controlling the lens movement processes the photo-detector signal by producing integrated sum and differences signals from the two detectors and using these signals to provide indications of the direction and amount of extension of the lens necessary to be in focus. The processor uses comparators, a counter for measuring extension and a memory for remembering the direction of misfocus.

REFERENCES:
patent: 3906389 (1975-09-01), Matsumoto et al.
patent: 4251145 (1981-02-01), Cocron et al.
patent: 4470681 (1984-09-01), Johnson

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