Patent ID: 7123851

Claim:
An adjustment method for an image forming device, for adjusting image forming condition with respect to a sheet, the image forming device comprising: image forming means for forming an image on an image carrying body and transferring the image from the image carrying body to a sheet, the adjustment method comprising the steps of: (a) creating an adjustment sheet with the image forming means, by forming a first image, that is used for detecting scanning error of an image scanning device, on the image carrying body and transferring the first image from the image carrying body to the sheet, the first image being formed over at least three corners of the sheet while extending outside the sheet; (b) scanning the adjustment sheet created in the step (a) by the image scanning device and calculating a scanning error amount of the image scanning device based on image data of the first image, so as to find a correction value of image forming condition of the image forming means in consideration of the scanning error amount; and (c) modifying image forming condition of the image forming means based on the correction value found in the step (b).