Patent ID: 8107840

Claim:
An image forming apparatus, comprising: an exposing section that illuminates a surface of a charged image bearing body to form an electrostatic latent image; a developing member developing the electrostatic latent image; a developer material reservoir; a supplying member that supplies developer material to the developing member from the developer material reservoir; a voltage supply that applies a voltage to the developing member and the supplying member; a controller that controls the voltage supply to output the voltage; and a detector that generates a detection signal indicative of an amount of developer material remaining in the developer material reservoir; wherein the controller performs voltage correction in which the voltage supply outputs the voltage in accordance with the detection signal; wherein when the detection signal indicates that the amount of the developer material is equal to or higher than a reference value, the controller controls the voltage supply to output a first voltage to the developing member; wherein after the detection signal indicates that the amount of the developer material is lower than the reference value, the controller controls the voltage supply to output a second voltage to the developing member, the second voltage having a smaller absolute value than the first voltage; wherein when the detection signal indicates that the amount of the developer material is equal to or higher than the reference value, the controller controls the voltage supply to output a third voltage to the supplying member; and wherein when the detection signal indicates that the amount of the developer material is lower than the reference value, the controller controls the voltage supply to output a fourth voltage to the supplying member, fourth voltage having a larger absolute value than the third voltage.