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An arrangement for controlling the quantity of light for the exposure of photosensitive material for copying straight to the differential pressure the form of preparation
An arrangement for controlling the quantity of light for the exposure of photosensitive material for copying straight to the differential pressure the form of preparation
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机译:一种用于控制光量的装置,用于曝光光敏材料,以直接复制到压差形式的制剂
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摘要
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 2ROOT 2:1.
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