| 摘要 |
PURPOSE:To reproduce a copy emphasized the desired portion in a complexed original image, by impregnating on a photoreceptor, dividing the charge voltage and developing bias voltage into plural modes, using a compounded photoreceptor. CONSTITUTION:The surface of a compounded photoreceptor 12 is charged in negative by a primary charger and is charged in positive by a secondary charger. A part of negative charge on the surface of the compounded photoreceptor 12 is neutralized and negative charge is induced to a conductive substrate 8. Consequently, the surface of the compounded photoreceptor 12 is changed to positive electric potential. Next, an original image with two colors of red and black is exposed and imaging on this surface. A area (a) corresponds to the black image, a area (b) corresponds to red image and a area (c) corresponds to the original base color. These become electric potential of the surface corresponding to the respective color. After this, image is developed by positive charged black toner and negative charged red toner to make it visible and then, it is transferred on the transferring paper. By means of this, two colored copy can be obtained. Partial by emphasis of the original can be performed by changing the visible condition of red and black of two colored copy, by combining control of charged voltage and developing bias voltage. |
