EXPOSURE CONTROL METHOD FOR ELECTROPHOTOGRAPHIC DEVICE

摘要

PROBLEM TO BE SOLVED: To realize such a printing action that a fringe is suppressed by making the reverse electric field of the periphery of an image part generating the fringe weak by using an exposure control means and suppressing the generation of fringe. SOLUTION: A latent image is exposed and formed on a photoreceptor drum by an exposure control means and developed by the toner of two colors by a try-level developing method by using two developing machines. The required try-level of the surface potential of the photoreceptor is obtained by switching two laser drivers 14 and 15 by a switch 16. By controlling the potential around the image stepwise by the exposure, the peripheral electric field of the image is made weak and the surface electric field of the photoreceptor is improved to such a level that a fringe phenomenon is not generated. Then, a dedicated laser driver 17 is added in order to control the exposure and data inputted from a host device is stored in an image memory 19. Besides, a fringe correction decision circuit 18 deciding a condition for actuating the driver 17 for correcting the fringe is arranged.