Automatic focussing system for photographic cameras

Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means

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250204, 354 31, 354195, G03B 708

Patent

active

039887472

ABSTRACT:
A prism positioned behind the objective rotates at a predetermined frequency. The pulsed light beam produced thereby is split into a first and second pulsed beam, each falling on a photoelectric transducer element. The first photoelectric transducer element is positioned at a distance from the objective which is less than the distance between the film plane and the objective plane by a predetermined distance. The second photoelectric transducer is positioned away from the objective by a distance exceeding the distance between the film plane and the objective plane by the same predetermined distance. The first and second electrical signals produced by the first and second photoelectric transducer are differentiated and stored. The so-stored signals are compared and a control signal for driving a motor in a first or second direction is furnished corresponding to the difference therebetween. The motor drives the objective either closer to or away from the film plane in response to the control signal.

REFERENCES:
patent: 3610934 (1971-10-01), Turner
patent: 3860935 (1975-01-01), Stauffer
patent: 3937950 (1976-02-01), Hosoe et al.
Frosch et al., IBM Technical Disclosure Bulletin, vol. 15, No. 2, p. 504, July 1972.

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