Patent ID: 7139497

Claim:
An electrophotographic image forming apparatus comprising: a drum speed controller; and an image forming section including, an image carrier configured to carry a toner image and a lattice having equal intervals, an endless belt, and an image transferring means configured to transfer the toner image from said image carrier to a recording medium conveyed by the endless belt and electrostatically adhered to said belt, said image transfer means further configured to transfer the lattice pattern to the belt, wherein a surface of said image carrier and a surface of said belt are configured to move at a speed of Vd and a speed of Vb, respectively, and the drum speed controller is configured to control a ratio Vd/Vb based on a relation (Vb/Vd)=(belt lattice interval/drum lattice interval), and the ratio of Vb/Vd is variable by a user of said image forming apparatus.