Patent attributes
An image forming apparatus, which uses a developing device including: a developer carrying member 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 the remaining amount of the developer contained in the developer containing portion, the image forming apparatus including a main body controller to which the signal is input, and which detects the remaining amount of the developer, the main body controller detecting the remaining amount of the developer in the developer containing portion based on the amount of change per a unit revolution number of the agitating member in the band of fluctuation in the signal in association with the rotation of the agitating member.
