Image forming apparatus with optical system control means

摘要

An apparatus for forming an image of a document on a photoreceptor includes a charging device for charging the photoreceptor so as to form an image region, an eliminating device for eliminating a charge on the photoreceptor to form a non-image region, and a scanner for moving from a stop position to scan a document with an exposure light so that a latent image, corresponding to an image of the document, is formed on the image region of the photoreceptor. The scanner also moves backward and stops at the stop position. A position signal corresponding to a predetermined position of the scanner is generated by a signal device. A timer starts counting a time responsive to the position signal. The timer produces a first and second timing signal after the scanner stops at the stop position. The scanner is controlled to move from the stop position to form a next latent image on the photoreceptor in response to the first timing signal, and the eliminating device is controlled to stop eliminating a charge on the photoreceptor so as to provide an image region on the photoreceptor for a next latent image in response to the second timing signal. The eliminating device provides a non-image region on the photoreceptor at a portion of the photoreceptor in a vicinity of an edge portion of the document.