Patent ID: 6674975
Filing Date: 2004-01-06
Classification: G03G

Abstract:
An electrophotographic image forming apparatus to which is detachably attachable a process cartridge to be mounted thereon and for forming an image on a recording medium, comprising:mounting means for detachably mounting the process cartridge having an electrophotographic photosensitive body, a part of process means for acting on said electrophotographic photosensitive body, and storing means for storing information, wherein the process means includes charging means for uniformly charging the surface of the electrophotographic photosensitive body and developing means for developing a latent image on the electrophotographic photosensitive body; driving means for driving the electrophotographic photosensitive body at a plurality of speeds; read and write means for reading the information out from or writing the information into the storing means; and control means for controlling an operating condition of the process means; wherein the storing means stores information relating to the utilized amount of the electrophotographic photosensitive body and calculation coefficient information for calculating the utilized amount of the electrophotographic photosensitive body according to the speed of the electrophotographic photosensitive body, and wherein said control means effects a calculation of the utilized amount of the electrophotographic photosensitive body according to the information relating to the utilized amount of the electrophotographic photosensitive body stored in the storing means and the calculation coefficient information and changes the operating condition according to a result of the calculation.