Developing device, process cartridge and image forming apparatus

摘要

A developing device for developing an electrostatic latent image formed on an electrophotographic photosensitive member, the developing device being usable with a main assembly of an electrophotograhic image forming apparatus, the developing device includes a developing member for supplying a developer to the electrophotographic photosensitive member for developing the electrostatic latent image formed on the electrophotographic photosensitive member; a first electrode provided opposed to developing member; a second electrode disposed such that at least a lower end thereof takes a position lower than the first electrode when the developing device is mounted to the main assembly of the electrophotographic image forming apparatus; wherein an electric signal is generated in accordance with an electrostatic capacity between the first electrode and second electrode when the first electrode or second electrode is supplied with a voltage from the main assembly of the electrophotographic image forming apparatus, and is measured by the main assembly of the electrophotographic image forming apparatus to detect a remaining amount of the developer.