| 摘要 |
<p>The present invention relates to an image forming apparatus which has a developing device for developing an electrostatic image formed on an image bearing member by a developer, a developer supplying unit detachably attachable to a main body of the image forming apparatus for supplying the developer to the developing device, density detecting device for detecting a density of the developer in the developing device, and second detecting device for detecting information regarding an amount of the developer in the developer supplying unit, and a state of the developer supplying unit being judged on the basis of a result of the detection by the density detecting device and a result of the detection by the second detecting device. <IMAGE></p> |
