Exposure control device for photographic copier

Details Exposure control device for photographic copier Exposure control device for photographic copier

G - Physics

03

B

95/28

G03B 27/72 (2006.01) G03B 27/80 (2006.01) G03F 7/20 (2006.01)

Patent

CA 1068146

Abstract of the Disclosure This invention relates to a control device, suitable for use to control the exposure of a light-sensitive material in a copying appara- tus for the preparation of a printing plate, which comprises program store means for predetermining a basic exposure, input line means for connection to a photocell for measuring the luminous intensity of a light source in the copying apparatus, comparator means having its input connected to an output of the program store means and connected by a transmission path means to the input line means, the output of the com- parator means being connectable to a control switch for the light source, and the transmission characteristics of the path being variable in steps, adjacent pairs of which have transmissivities in the ratio Image .

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