Image forming apparatus, cartridge and image forming system

摘要

In an electrophotographic image forming apparatus to which a cartridge containing a developer therein is detachably attachable, the cartridge has storing means storing therein information regarding the cartridge, and the main body of the apparatus is of a construction which has two or more means for relating the output of developer remaining amount detecting means and the developer amount to each other, and determines the means for relating the output of the developer remaining amount detecting means used to detect the developer amount from the output of the developer remaining amount detecting means and the developer amount to each other, on the basis of the information regarding the cartridge stored in the storing means