Patent ID: 6587650
Filing Date: 2003-07-01
Classification: G03G

Abstract:
A process cartridge detachably mountable in a main body of an electrophotographic image forming apparatus, said process cartridge comprising:an electrophotographic photosensitive member; a developing roller for developing a latent image formed on said electrophotographic photosensitive member by using a developer; a developer frame for containing the developer and having a supply opening, through which the developer is supplied to said developing roller; a first electrode provided along a longitudinal direction of said developing roller; and a second electrode provided closer to said supply opening than said first electrode, wherein said first and second electrodes are arranged at such positions that the developer can enter therebetween, and a capacitance between said second and first electrodes which is generated when a voltage is applied to said second electrode is detected so that the main body detects a developer amount, and said developer frame is arranged such that a lower end portion on an upper side of said supply opening of said developer frame is above a lower end of said second electrode.