Focus detecting device for photographic camera

Details Focus detecting device for photographic camera Focus detecting device for photographic camera

1979-08-27

1981-11-03

Gellner, Michael L.

354 31, G03B 310

Patent

active

042982596

ABSTRACT:
A focusing system for a camera using an array of photoelectric elements to sense the level of light at points in the image plane of an objective lens. The output of the elements are scanned in sequence to form a train of pulses whose amplitudes correspond to the level of light at the respective elements as they are scanned. The pulse train is split into two pulse trains of alternate pulses. The two pulse trains are separately converted to two analog signals and applied to a differential amplifier. The difference output is clamped to a reference potential and applied to a peak detector. When the objective is in focus, the output of the peak detector is at a maximum.

REFERENCES:
patent: 4047022 (1977-09-01), Holle
patent: 4171155 (1979-10-01), Jyojiki et al.
patent: 4178098 (1979-12-01), Asano et al.
patent: 4183642 (1980-01-01), Fukuoka

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