Patent ID: 7409178
Filing Date: 2008-08-05
Classification: G03G

Abstract:
1. An image forming apparatus for correcting color difference and position difference based on a unique correction data related to a transfer belt unit, the image forming apparatus comprising: a controller configured to read the unique correction data and manufacturing information of the transfer belt unit stored in a first memory contained in the transfer belt unit connected to a main body of the image forming apparatus, and configured to download the unique correction data from a server on the internet to the second memory by using the manufacturing information, and configured to transfer the unique correction data from the first memory to a second memory contained in the main body of the image forming apparatus; and a correction control unit configured to correct the color difference and position difference based on the unique correction data stored in the second memory, wherein the unique correction data includes an average velocity value of a rotation of the transfer belt based on multiple velocity measurements made along the rotation of the transfer belt.