Exposure control system employing a blade position sensor

Details Exposure control system employing a blade position sensor Exposure control system employing a blade position sensor

1974-11-22

1976-08-24

Hix, L. T.

354 22, 354 44, G03B 714

Patent

active

039770125

ABSTRACT:
An exposure control system for photographic apparatus utilizing motor driven shutter-diaphragm blades in conjunction with a blade sensor which is selectively positioned along the path of blade travel in accordance with an exposure value and which provides a control signal for reversing the blade drive to terminate the exposure interval. In the illustrated embodiment, the sensor is coupled to a comparison photometer and moved along the path of travel of the blades in accordance with photometer setting. Upon initiation of an exposure cycle, the blades are driven from a blocking position through progressively enlarging aperture values until the sensor is actuated by the blades. At this time the control circuitry is triggered to reverse the motor operation thereby returning the blades to a light blocking condition which terminates the exposure interval.

REFERENCES:
patent: 3418903 (1968-12-01), Land et al.
patent: 3695158 (1972-10-01), Fahlenberg
patent: 3781099 (1973-12-01), Williams et al.
patent: 3832722 (1974-08-01), Douglas

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