| 摘要 |
PURPOSE:To adjust green and red on the basis of blue to simply execute color compensation in a color copying device having plural photosensitive bodies by arranging a light quantity detecting sensor on the optical path of original image light and impressing the output of the sensor to a liquid crystal filter. CONSTITUTION:Original image light is led through a mirror and a lens, blue light is reflected, transmitted green and red light beams are divided, respective latent images are formed on respective photosensitive bodies, and their complements are developed. In said constitution, respective photodiodes are arranged on blue, green and red optical paths and a threshold determining blue as a reference is set up from the output values of the photodiodes and light source elements. The threshold is compared with green and red outputs, their output signals H, L are integrated, the voltage is boosted by a non- inversional amplifier and inverted, and a liquid crystal filter is driven by a 2-channel analog switch to be controlled by a clock oscillator. Even if a light source voltage is changed, the total reaction value of the blue, green and red photosensitive bodies is uniformed and the quantity of light in each color can be optionally adjusted.
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