Patent ID: 7705866

Claim:
An image forming apparatus comprising: an image bearing member; a charging unit for charging said image bearing member; an image exposure unit including a light emitting portion for emitting light to form an electrostatic image on said image bearing member charged by said charging unit, said image exposure unit being effective to control an amount of light emitted from the light emitting portion; a developing unit including a toner carrying member for carrying toner and a bias controlling unit for applying a controlled bias voltage to the toner carrying member, said developing unit being effective to develop the electrostatic image with toner by a potential difference between the toner carrying member and the electrostatic image; a potential difference determining unit for determining the potential difference; and a storing unit for storing a light amount control value, corresponding to the potential difference, set on a basis of a light emission amount information inherent to the light emitting portion, wherein said image exposure unit reads the light amount control value corresponding to the potential difference determined by said potential difference determining unit and controls the light amount on the basis of the light amount control value read from said storing unit.