Patent ID: 6507713
Filing Date: 2003-01-14
Classification: G03G,H04N

Abstract:
An image formation apparatus comprising:at least one photosensitive drum; an optical writing device which carries out an optical writing process in a main-scanning direction on the outer surface of the at least one photosensitive drum at least line by line; a developing device which develops an electrostatic latent image optically written on the at least one photosensitive drum into a toner image by using toner; an intermediate transfer belt which transfers the toner image located on the at least one photosensitive drum, that is shifted in synchronism with the at least one photosensitive drum while being pressed onto the at least one photosensitive drum; a rotation angle detection unit which detects a rotation angle of the at least one photosensitive drum directly or indirectly; an eccentricity detection unit which detects an eccentric position from the rotary axis of the at least one photosensitive drum located in the center of a circle cross-section of the at least one photosensitive drum; and a correction unit which, based upon results of detection by the rotation angle detection unit and the eccentricity detection unit, finds an amount of eccentricity of the at least one photosensitive drum, an eccentric rotation angle and a radius of the at least one photosensitive drum, and based upon resulting values, compensates for a distortion and a color offset of a toner image before the transfer to a sheet.