Patent ID: 8676100
Filing Date: 2014-03-18
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a first image bearing member; a belt member contacting said first image bearing member; a first latent image forming unit configured to form an electrostatic latent image including a first latent image and a first latent index pattern on said first image bearing member; a first developing member configured to form a first toner image from the first latent image formed on said first image bearing member; a first transfer member configured to transfer the first toner image and the first latent index pattern from said first image bearing member onto said belt member; a first detecting member configured to detect a transferred first latent index pattern onto said belt member; a second image bearing member configured to be disposed at a position downstream of said first image bearing member with respect to a moving direction of said belt member and to contact said belt member; a second latent image forming unit configured to form an electrostatic latent image including a second latent image and a second latent index pattern on said second image bearing member; a second developing member configured to form a second toner image from the second latent image formed on said second image bearing member; a second transfer member configured to transfer the second toner image from said second image bearing member onto said belt member; a second detecting member configured to detect the second latent index pattern formed on said second image bearing member; an adjusting portion configured to adjust a forming operation of the first latent index pattern and the second latent index pattern on the basis of an output of said first detecting member and an output of said second detecting member; and a belt charging member configured to be disposed at a position upstream of said first image bearing member and downstream of said second image bearing member with respect to the moving direction of said belt member, and configured to electrically charge a region, of said belt member, which is different from a region of the first toner image and which overlaps with the first latent index pattern with respect to a widthwise direction perpendicular to the moving direction of said belt member.