Patent Document ID: 9291932
Application ID: 13679088
Patent Status: 1

Claim One:
1. An image forming apparatus, comprising: a plurality of image forming devices, each including a developing device that develops an electrostatic latent image formed on an image bearing member to form a toner image, and a transferring device that transfers the toner image developed by the developing device to an intermediate transfer member or a transfer material conveyed by a transfer material conveyance member, for each of a plurality of colors; an exposure unit that irradiates the image bearing members with a laser beam to form the electrostatic latent image on the image bearing members; a detector that detects an image pattern for correcting misregistration of each color, the image pattern formed on the intermediate transfer member or the conveyed transfer material; and a control device that corrects the misregistration of each color based on a detection result by the detector, wherein the control device performs control to form an image pattern of at least one color among the plurality of colors but not all of the plurality of colors on a first page interval in an image forming area that is between a first image and a second image formed subsequently to the first image, and corrects misregistration based on a first period from a timing when a reference signal to form the image pattern of the at least one color among the plurality of colors is transmitted to a timing when the image pattern of the at least one color among the plurality of colors is detected by the detector, wherein the control device performs control to form an image pattern of another color different from the at least one color among the plurality of colors on a second page interval different from the first page interval, and corrects misregistration based on the first period and a second period from a timing when a reference signal to form the image pattern of the other color is transmitted to a timing when the image pattern of the other color is detected by the detector.