Patent ID: 7630655
Filing Date: 2009-12-08
Classification: G03G

Abstract:
1. An image forming apparatus, which uses a developing device including: a developer carrying member for developing an electrostatic latent image formed on an electrophotographic photosensitive member with a developer; a developer containing portion containing the developer; an agitating member provided rotatably in the developer containing portion to agitate the developer; and a developer remaining amount detecting member outputting a signal for detecting a remaining amount of the developer contained in the developer containing portion, the developer remaining amount detecting member being disposed at a position closer to the developer carrying member than to a center of rotation of the agitating member in the developer containing portion, the image forming apparatus comprising: a main body controller to which the signal is input, and which determines the remaining amount of the developer, the main body controller determining the remaining amount of the developer in the developer containing portion and indicating that the remaining amount of the developer in the developer containing portion reaches a predetermined amount after an amount of change per a unit revolution number of the agitating member in a band of fluctuation in the signal in association with a rotation of the agitating member becomes zero.