Patent ID: 9645529
Date: 2017-05-09
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: an image forming section including a plurality of image forming units disposed side by side along a moving direction of an intermediate transfer belt or a conveyor belt and successively forming images with the image forming units on the intermediate transfer belt or a recording medium conveyed by the conveyor belt; at least two detection parts disposed on a moving path of the intermediate transfer belt or the conveyor belt on an outer surface of a belt face of the intermediate transfer belt or the conveyor belt which directly faces the image forming units, and detecting a speed of the intermediate transfer belt or the conveyor belt; and a control section which performs color misregistration correction control to correct color misregistration of the images composed of colors to be formed on the intermediate transfer belt or the recording medium conveyed by the conveyor belt on the basis of a detection result of the detection by the detection parts, wherein the control section (a) calculates a difference value between (i) a first speed of the intermediate transfer belt or the conveyor belt detected by, among the at least two detection parts, a first detection part disposed on an upstream side of the moving path and (ii) a second speed of the intermediate transfer belt or the conveyor belt detected by, among the at least two detection parts, a second detection part disposed on a downstream side of the moving path after a predetermined time from a detection time of the detection by the first detection part, the predetermined time being obtained by dividing a distance between the first detection part and the second detection part by a target speed of the intermediate transfer belt or the conveyor belt, and (b) performs the color misregistration correction control on the basis of the calculated difference value.