Patent ID: 8874014

Claim:
An image forming apparatus, comprising: an image bearing member; a charging device configured to charge a surface of the image bearing member; a power source configured to apply a voltage to the charging device; an exposure device configured to irradiate the surface of the image bearing member with a light beam to form an electrostatic latent image; a developing device configured to develop the electrostatic latent image into a toner image; and a reading device configured to read a color registration toner image developed by the developing device, wherein in a case of formation of an output image, the exposure device emits the light beam for forming the image after a surface potential of the image bearing member reaches a predetermined potential, and in a case of formation of the color registration toner image after the power source is started up, the exposure device starts to emit the light beam for forming the color registration toner image before the surface potential of the image bearing member reaches the predetermined potential.