Developing apparatus using blank pulse bias

Abstract

An image forming apparatus includes an image bearing member for bearing an electrostatic image; a developer carrying member, opposed to the image bearing member, for carrying a developer containing toner; bias voltage applying device for applying a developing bias voltage to the developer carrying member, the bias voltage satisfying: ##EQU1## V1 (V): a voltage applying force to the toner toward the developer carrying member away from the image bearing member; T1 (sec): a time period of application of the voltage V1; V2 (V): a voltage applying force to the toner away from the developer carrying member toward the image bearing member; T2 (sec): a time period of application of the voltage V2; T3 (V): a time period of application of a voltage V3 which is (V1+V2)/2; d (m): distance between the image bearing member and the developer carrying member.

Dependencies are inferred from the claim text.