JPS55101955A - Electrophotographic recording device - Google Patents

Abstract

PURPOSE: To speed up the operation of an electrophotographic recording device of multicolor print, by forming three potential images on the surface of a latent image forming medium, and developing continuously with toners of different colors.

CONSTITUTION: When the outer circumference of a photosensitive drum 10 passes through a primary charger 20, the surface of an insulation layer 13 is uniformly charged negatively. In succession, when passing through a secondary charger 30 and a first exposure unit 40, the part P subjected to exposure by furst negative image is positively charged on the surface. Then, when passing through a second exposure unit 50, the surface negative potential decreases only in the part M subjected to exposure by second negative image. After passing through a third exposure unit 60, the full surface is exposed. By adjusting the exposure at this time, the surface potential of unexposed part Z is set to an intermediate potential between the potential of the first negative image part P and that of the second negative image part M. Thereafter, the images are continuously developed by developing devices 70, 80 using toners of different colors and different polarity of charging, then transfer can be finished at a time in a transfer device 100.

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