Patent ID: 8190044

Claim:
An image forming apparatus comprising: an image bearing member for bearing an electrostatic latent image; a developing device including: (i) a developer carrying member for carrying a developer and developing an electrostatic latent image formed on the image bearing member, and (ii) a supplying member for contacting the developer carrying member to supply the developer to the developer carrying member, wherein a peripheral speed Sopc of a surface of the image bearing member and a peripheral seed Sdr of a surface of the developer carrying member change while a ratio therebetween is maintained; and a control device for controlling a voltage Vrs applied to the supplying member and a voltage Vdr applied to the developer carrying member such that the voltage Vrs relative to the voltage Vdr increases, with a decrease in an absolute value of a difference between the peripheral speed Sopc and the peripheral speed Sdr, in a direction of a polarity which is the same as a polarity of the developer, while maintaining the ratio between the peripheral speed Sopc and the peripheral speed Sdr.