Patent ID: 6522842
Filing Date: 2003-02-18
Classification: G03G

Abstract:
A developing apparatus, comprising:a developer bearing body for bearing a developer and conveying the developer to a developing section; and a developer charging member for charging the developer borne by the developer bearing body, the developer charging member being provided at an upstream side of the developing section in a conveying direction of the developer borne by the developer bearing body and being cleaned in a nondeveloping operation period; a first power source for applying a developing voltage to the developer bearing body; a second power source for applying a developer charging voltage to the developer charging member; and control means for controlling the first power source and the second power source, wherein the developer borne by the developer bearing body is charged by applying a developer charging voltage with a same polarity as a polarity of the developing voltage from the second power source to the developing charging member, and wherein, in the nondeveloping operation period, the control means causes the first power source to apply a first voltage to the developer bearing body, causes the second power source to apply a second voltage to the developer charging member, charges a polarity of a voltage difference between the first voltage and the second voltage opposite to a charging polarity of the developer, and recharges a polarity of the voltage difference as a charging polarity of the developer.