JPS54116234A - Rhotoreceptor for electrophotography - Google Patents

Abstract

PURPOSE: To enable always distinct two color copied images to be obtained and enable the production of the photoreceptor itself to be readily performed by laminating two kinds of specific photoconductive layers on a conductive substrate.

CONSTITUTION: A first photoconductive layer 12 composed of photoconductive ZnO, a sensitizer and a binder and a second photoconductive layer 13 such as CdS-resin dispersion layer are laminated on a conductive substrate 11. Negative charges are applied from a charger 2 to this photoreceptor 1 under the even radiation of light hυA of a color A. The light hυA transmits through the layer 13 and is absorbed in the layer 12 to turn this conductive, by which positive charges are induced at the boundary of the layers 12,13. Next, positive charges are applied by a charger 3, after which white color images are exposed. In the portions corresponding to the white ground of the original, the light hυA₊B is radiated and the layers 12, 13 are respectively turned conductive, then their surface potentials become nearly 0. One the other hand, the positive surface potentials are maintained in the unexposed parts and negative potentials appear in the portions corresponding to the color A of the original. These latent images are developed by developers TA, TB of opposite polarities

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