Patent ID: 6750892
Filing Date: 2004-06-15
Classification: G03G,H04N

Abstract:
A density correction method in an image forming apparatus in which a planar latent image is formed by sub-scanning in which a main scanning position of a light beam is moved relatively to an image retaining member while main scanning of a light beam is being effected on the image retaining member, and the latent image is developed and transferred to an image recording medium, thereby forming an image on the image recording medium, said method comprising the steps of:detecting an image density of an image on one of the image retaining member and the image recording medium; based on the image density, calculating an amount of correction in an intensity of the light beam in an image region within a range of one main scan; correcting the intensity of the light beam in the image region in accordance with the amount of correction; and when the amount of correction in the intensity of the light beam is changed, changing the intensity so that a predetermined parameter value detected within a predetermined portion of the image region remains substantially equal before and after the amount of correction is changed, thereby creating a uniformity of the image density in the main scanning direction of the light beam.