Vorrichtung zur Steuerung der Belichtung eines Kopiermaterials

摘要

An arrangement for controlling and shortening the exposure times of copying apparatus adapted to two colors on an original or master to be copied. The light source in the copier transmits light of the two colors along a path into which blocking filters may be selectively inserted. One blocking filter is provided for each one of the colors. Two adjustable timing generators control the insertion of the blocking filters into the light path so that the blocking filter for the one color requiring shorter exposure is inserted into the light path at either the beginning or the end of the exposure. Operational amplifiers with capacitor feedback operate in conjunction with potentiometers for generating the appropriate time intervals for the exposure.