| 摘要 |
PURPOSE:To permit easy formation of sharp toner images and display of plural colors by using the developer consisting of at least two components of the 1st particles of a certain color, conductivity and magnetism and the 2nd particles having insulation characteristic, electrostatic chargeability by friction and a color differing from that of the 1st particles. CONSTITUTION:The developer held on a developing sleeve 5 having magnets inside is the developer contg. conductive magnetic particles 6a and particles 6b having different color from said particles and insulation characteristic and friction chargeability. Relatively high DC bias 4 is applied between the sleeve 5 and a conductive substrate 2 of a photoreceptor and picture light is exposed to the position where the mixed developer and the photoreceptor contact. By this exposure, the surface of the photoreceptor is made selectively non-stickable in the bright part and only the particels 6b having insulation characteristic are stuck on these parts. The conductive particles 6a and the particels 6b are stuck on the parts except the selectively non-stickable parts to obtain the toner images like image patterns. |
