Device for automatic diaphragm setting in photographic cameras

Details Device for automatic diaphragm setting in photographic cameras Device for automatic diaphragm setting in photographic cameras

1975-04-21

1976-10-26

Adams, Jr., Russell E.

354 41, 354 42, 354 46, 354271, G03B 708

Patent

active

039887499

ABSTRACT:
An automatic diaphragm control for camera lenses having independent diaphragm and shutter speed rings in which a reversible motor is positioned to drive the diaphragm ring, and a gear engaging the diaphragm ring drives a potentiometer. A light-sensor is in circuit with the motor and the potentiometer to drive the diaphragm ring to cause the potentiometer to balance the light-sensor output. The position of the diaphragm ring and the potentiometer is adjustable for film speed and for the selected shutter speed.

REFERENCES:
patent: 2655086 (1953-10-01), Walker
patent: 2890641 (1959-06-01), Field
patent: 3533347 (1970-10-01), Auguste et al.
patent: 3541941 (1970-11-01), Barr et al.
patent: 3816841 (1974-06-01), Maronde et al.

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