Patent ID: 6026253
Filing Date: 2000-02-15
Classification: G03G

Abstract:
An electrophotographic image forming apparatus for forming an image on a recording medium, comprising:(a) a mounting portion configured to mount a developing unit including a developing member for developing a latent image formed on an electrophotographic photosensitive member, a developing agent containing portion for containing developing agent to be supplied to said developing member, and a signal output member for outputting a signal corresponding to the remaining amount of developing agent contained in said developing unit; and(b) a remaining amount detecting portion for detecting the remaining amount of the developing agent contained in said developing unit when said developing unit is mounted to said mounting portion, said remaining amount detecting portion detecting a signal outputted from said signal output member prior to image formation representing a value of a property of said remaining amount detecting portion and detecting a developing-agent remaining amount at least in part based on the detected signal.