Image forming apparatus, cartridge, image forming system, and a memory device for determining the amount of developer in a developer containing portion

摘要

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