Patent ID: 8774649

Claim:
An image forming apparatus comprising: an image forming portion for forming an image on a recording material, said image forming portion including a developing device for developing an electrostatic image formed on an image bearing member using a developer containing toner and a carrier; a sensor for detecting a toner image formed by said image forming portion; a correcting portion for correcting an image forming condition of said image forming portion on the basis of a result of detection, by said sensor, of a first control toner image formed by said image forming portion; a supplying device for supplying the developer to said developing device; a supply controller for controlling a supplying operation of said supplying device on the basis of a result of detection, by said sensor, of a second control toner image formed by said image forming portion; an executing portion for executing an operation at least in a first image forming mode in which the image is formed at a first image forming speed and in a second image forming mode in which the image is formed at a second image forming speed which is lower than the first image forming speed; and a controller for controlling an image forming condition such that during execution of the operation at least in the second image forming mode, the first control toner image is formed at the image forming speed of the second image forming mode, and the second control toner image is formed after the image forming speed is changed to a third image forming speed which is higher than the second image forming speed.