| 摘要 |
PURPOSE:To enable expression of the black image of an original in white to the ground of red or other colors with addition of simple constitution by inserting freely removably a red filter into an optical path for red exposing light. CONSTITUTION:The respective latent images of a photosensitive body 11 for a red image in the exposing part of which the latent image in the red part of an original is formed and a photosensitive body 12 for a black image in the dark part of which the latent image in the black part of the original is formed in the stage of exposing are developed by a red toner and a black toner and are superposedly transferred, by which a two-color copy is formed. The original drawn with black and red on the white ground is used and a freely removable red filter 101 is inserted into an optical path for red exposing light for the body 11. When a surprint mode is set after the drum 12 system is put into the non-operating state, the white light corresponding to the white ground forms red light to the body 11. The copy in which the white ground part and red image part of the original are the red ground part and the black image part is the white image is formed by addition of the simple constitution. The similar copy is formed from the single black colored original image having the white ground. |
