Instantaneous exposure control for vesicular film copier

G - Physics – 03 – D

Patent

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95/28

G03D 7/00 (2006.01) G03B 27/80 (2006.01) G03C 5/08 (2006.01)

Patent

CA 1066103

INSTANTANEOUS EXPOSURE CONTROL FOR VESICULAR FILM COPIER Abstract of the Disclosure The exposure of film which changes its transmissivity as a function of the quantum of light to which it is sub- jected is controlled by sensing the intensity of the light transmitted through the film. From the sensed light the change in the light transmissivity of the film is determined and when that change has reached the desired level the exposure of the film is terminated. The exposure is instant- aneously controlled and terminated only after and in response to a predetermined change in the light transmissivity of the film and the desired exposure level has been reached irrespective of the time required.

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