| 摘要 |
PURPOSE:To inexpensively and simply prevent color mixing on printing by forming a full exposure means having the light of wavelength with a low toner transmission ratio to an already formed image between a developing process and the succeeding electrostatic charging process. CONSTITUTION:A photosensitive body 1 is rotated in a direction A and charged 2, red information is exposed 3 and the 1st electrostatic latent image is formed. The latent image is inversely developed 4 and red toner adheres to an optically attenuated part. When the whole surface of the photosensitive body 1 is exposed by a red destaticizing lamp 5, only a non-image part is exposed because the red toner acts as a mask. The photosensitive part 1 is charged 6 again and the red toner part is lowered. Then, black image information is exposed 7, the 2nd electrostatic latent image is formed and the latent image is inversely developed 8 to form a black toner developed image. Thus, two red and black toner developed images are transferred 9 to paper S. The residual transfer toner on the photosensitive body 1 is scraped by a cleaning brush 11 and the whole surface of the photosensitive body 1 is exposed by a destaticizing lamp 12. Thus, color mixing on printing can be prevented.
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