| 摘要 |
PURPOSE:To perform dichroic printing efficiently by using a photoreceptor formed by stacking the 1st photoconductive layer (N type), the 2nd photoconductive layer (P type), and an insulating layer on a conductive base body, and carrying out electrostatic charge, exposure, and development in specific methods. CONSTITUTION:The 1st photoconductive layer 12 made of an N type semiconductor, the 2nd photoconductive layer 12 made of a P type semiconductor, and the insulating layer 13 are laminated successively to form the photoreceptor 1. Then, while the surface of the photoreceptor 1 is charged electrostatically positively, a positive image of picture information in the 1st color is formed by the 1st optical image exposure L1 (i); and while the surface of the photoreceptor 1 is charged by an alternating current (or electrified negatively) (ii), a positive image of picture information in the 2nd color is formed by the 2nd optical image exposure L2 and the photoreceptor surface is exposed entirely (iii) to form latent images with surface potentials corresponding to the 1st optical image exposure part, the 2nd optical image exposure part, and an exposed part. Then, the images are developed with the 1st and the 2nd toner materials charged to the opposite polarities at a specific bias voltage (iv), and transferred to obtain dichroic print. |
