| 摘要 |
PURPOSE:To remove black frames accompanied by contraction magnification, by providing an array of LED's in parallel to the longitudinal direction of a photoreceptor drum. CONSTITUTION:The light emitting face of an LED array is arranged between the part 4 of the photoreceptor drum 1 of an electrostatic copying apparatus on which a latent image is formed by slit exposure, and a developing part 5 in parallel to the longitudinal direction of the drum 1 and facing the drum 1. X is the part on which a contracted image is formed, and Y is a part of 4 in addition to X. Since Y is not illuminated with light as a matter of cource, black frames are formed. To prevent them, the light emitting diodes of the array 17 are allowed to emit light by selectively controlling the emission in accordance with a microcomputer, and exposing the part y to light before a developing process. When the part X passes below the array 17, LED's are allowed to emit light only on the parts Y' and y', and after the part X has passed, all the length of them are allowed to emit light, permitting only Y to be exposed. |
