Motion picture camera with variable aperture control rate

Details Motion picture camera with variable aperture control rate Motion picture camera with variable aperture control rate

1975-12-10

1978-01-03

Adams, Russell E.

Optics: motion pictures

With automatic diaphragm control

354 23D, 354 44, 354 60A, 354271, G03B 708

Patent

active

040663477

ABSTRACT:
The pulse repetition rate of a pulse generator furnishing pulses to a stepmotor which opens and closes the aperture in response to signals indicating that the quantity of light falling on the film is too little or too much respectively, is varied so that the aperture size is changed more rapidly when the difference between the desired and the actual quantity of light falling on the film is great, and is changed more slowly as the quantity of light falling on the film approaches the desired light quantity.

REFERENCES:
patent: 3328658 (1967-06-01), Thompson
patent: 3813680 (1974-05-01), Wagensonner et al.

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