| 摘要 |
An image forming apparatus having 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 effect the development of the electrostatic image, and an image bearing member speed controlling device capable of switching the rotating speed of the image bearing member between a first speed and a second speed lower than the first speed, and performing an image forming operation, the rotating speed of the developer carrying member is controlled so that the rotating speed of the developer carrying member when the image forming operation is performed at the second speed controlled so as to be less than 70% of the first speed may be within a range of ±30% of the rotating speed of the developer carrying member when the image forming operation is performed at the first speed.
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