Patent ID: 8489011

Claim:
An image forming apparatus comprising: a developer bearing member configured to bear a developer to develop a latent image formed on an image bearing member; a developer regulating member configured to regulate an amount of the developer carried on the developer bearing member; a voltage application unit that can apply a plurality of direct current voltages of different values between the developer bearing member and the developer regulating member; and a current detection unit that can detect a direct current flowing in the developer regulating member, wherein the image forming apparatus is capable of executing a detection control operation to cause the current detection unit to detect a change of the direct current flowing in the developer regulating member while changing a value of the direct voltage applied by the voltage application unit when the latent image is not being developed, and wherein the image forming apparatus sets a direct current voltage value Vb applied by the voltage application unit, when developing the latent image after executing the detection control, based on Vs, where Vs is a difference between direct voltages values applied by the voltage application unit when the detection control is executed and the current detection unit detects a minimum value and a maximum value of the direct current.