Patent ID: 9423752
Filing Date: 2016-08-23
CPC Classification: G03G

Claim Text:
1. An image forming apparatus comprising: an image bearer to rotate; a toner image forming device to form a toner image on the image bearer; a transfer rotator disposed opposing to the image bearer; a transfer device to transfer the toner image from the image bearer onto either the transfer rotator or a recording medium conveyed on the transfer rotator; a rotation position detector to detect a reference rotation position of one of the image Bearer and a rotator that contributes to image formation; an image density detector to detect an image density of the toner image transferred from the image bearer; circuitry configured to: cause the toner image forming device to form an adjustment toner image equal to or greater in length than the image bearer in a rotation direction of the image bearer, cause a linear velocity difference between the image bearer and the transfer rotator in transfer of the adjustment toner image, acquire, from a detection result of the adjustment toner image generated by the image density detector, image density unevenness data with reference to detection of the reference rotation position, the image density unevenness data including an image density unevenness component having a rotation cycle of the one of the image bearer and the rotator, and adjust an image forming condition according to the detection of the reference rotation position, the image density unevenness data, and the linear velocity difference, wherein the circuitry recognizes, based on the detection of the reference rotation position, a reference arrival time at which the adjustment toner image is to arrive at a detection position of the image density detector in a state in which the image bearer is identical in linear velocity with the transfer rotator, the circuitry starts acquisition of the image density unevenness data at the reference arrival time, and the circuitry starts adjusting the image forming condition at a time point shifted from the reference arrival time by an amount corresponding to the linear velocity difference.