| 摘要 |
PURPOSE:To reproduce a black image always sharply unaffected by color mackle accompanied by slip of register, by enabling the black image to be reproduced with a black toner alone in executing color image copying by the color separation method. CONSTITUTION:A black-omitted color image in a state freed of a part corresponding to the black image part BL of an original image O, as shown in a figure (d) is synthetically copied on the face of a copying material P. The surface of the first photoreceptor 1 is cleaned, and it is exposed to the light as a dark pattern of the original image O without interposing a color filter. A latent image having charge substantially remaining only on the part 1BL of the photoreceptor 1 corresponding to the black image part BL of the image O is formed by somewhat intensifying its exposure as shown in (e), and its latent image is developed with a black toner TBL. This black toner image TBL is overlaid on the material P surface to transfer the image. The color copy in which the part BL of the image O is reproduced with a single black toner layer TBL as shown in (f) is formed. The toner image on the copying material P is fixed to its surface to obtain a final copy. |
