Image forming apparatus having banding correction function

摘要

The image forming apparatus includes a CPU that performs control to form an inspection image for determining whether or not banding is suppressed to be smaller than a predetermined threshold value; and a density sensor that detects an intensity of banding periodically occurring in a sub-scanning direction of the formed inspection image. If based the detected banding intensity, the CPU has determined that the banding is not suppressed to be smaller than the predetermined threshold value, the CPU performs control to not perform banding correction or performs control to re-set a relationship between a phase of a rotary member and correction information.

主权项

1. An apparatus for controlling formation of an image by an image forming unit having a rotary member for image formation based on image data that is externally input, the apparatus comprising:
a correction section that performs banding correction for banding periodically occurring in a sub-scanning direction, by correcting the image data based on banding correction information according to a phase of the rotary member; a control section that performs control to make the image forming unit form an inspection image for determining whether or not the intensity of the banding periodically occurring in the sub-scanning direction is suppressed to be smaller than a predetermined threshold value, for an image formed by the image forming unit; and a detection section that detects the intensity of the periodic banding in the sub-scanning direction of the inspection image formed by the image forming unit, wherein the inspection image includes a first inspection image in which the banding correction is performed and a second inspection image in which the banding correction is not performed, and wherein in a case where the intensity of the banding for the first inspection image detected by the detection section is larger than the intensity of the banding for the second inspection image detected by the detection section, the control section does not perform a banding correction for subsequent image formation, or performs control to re-set the relationship between the phase of the banding and the banding correction information for correcting the image data.