Patent ID: 7880756
Filing Date: 2011-02-01
Classification: B41J,G03G

Abstract:
1. An image forming apparatus, comprising: a photoreceptor member having a reference mark; a LED head that includes a plurality of light emitting diodes arrayed in a line along a rotating axial direction of said photoreceptor member and that is modulated in response to image signals, so as to expose said photoreceptor member while said photoreceptor member is rotating; a storage section to store deviation information for one revolution of said photoreceptor member, which are measured in advance by setting said reference mark as a measuring base point; a driving section to move said LED head back and forth against said circumferential surface of said photoreceptor member; a position detecting sensor to detect said reference mark residing on said photoreceptor member while said photoreceptor member is rotating; and a position controlling section that reads said deviation information stored in said storage section based on detection of said reference mark by said position detecting sensor, to control said driving section based on said deviation information read from said storage section, so as to keep a distance between said LED head and said circumferential surface of said photoreceptor member constant.