Control device and copier

Details Control device and copier Control device and copier

1976-06-23

1979-03-13

Hix, L. T.

Photocopying

Contact printing

Light monitoring exposure control

355 68, G03B 2778

Patent

active

041439686

ABSTRACT:
This invention relates to a control device, suitable for use to control the exposure of a light-sensitive material in a copying apparatus 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 comparator 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 .sqroot.2:1.

REFERENCES:
patent: 3790789 (1974-02-01), Takahashi et al.
patent: 3795444 (1974-03-01), Glidden et al.

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