Patent ID: 7317889

Claim:
An image forming apparatus comprising: an image bearing member rotatable with an electrostatic image borne thereon; a developer carrying member rotated with a developer carried thereon and conveying the developer to a developing portion to develop of the electrostatic image; image bearing member speed controlling means for switching a rotating speed of said image bearing member between a first speed and a second speed lower than the first speed, and performing an image forming operation at each speed; and developer carrying member speed controlling means for controlling a rotating speed of said developer carrying member so that a rotating speed of said developer carrying member when the image forming operation is performed by rotating said image bearing member at the second speed, which is less than 70% of the first speed so as to be within a range of ±30% of a rotating speed of said developer carrying member when the image forming operation is performed by rotating said image bearing member at the first speed.