| 摘要 |
PURPOSE:To permit easy formation of different sets of light information by charging the surface of a photoreceptor electrostatically uniformly to potential of a prescribed polarity, irradiating the 1st light information thereto with prescribed light intensity and irradiating the 2nd light information with prescribed light intensity. CONSTITUTION:The surface A of a photoreceptor is charged electrostatically uniformly with a corona discharger C which is applied with voltage of a prescribed polarity from an electric power source E1. Thereafter, light is irradiated to the surface of the photoreceptor charged uniformly with an original O1. Different light information is irradiated thereto with an original O2. At this time, the light intensity in the irradiation of the light information is such voltage at which the potential in the bright part of the photoreceptor surface can be developed thoroughly with reversal development. A developer T1 charged to a negative polarity is supplied onto the surface A of the photoreceptor by a developing device D1 and a developer T2 charged to a positive polarity is supplied to the surface of the photoreceptor with a developing device D2. Two colors of the developed images are obtained by differing the colors of the developers. |
