Patent ID: 9541861
Date: 2017-01-10
CPC Classifications: G03G

Claim:
1. A developing device comprising: a toner carrying member configured to rotate while carrying toner on an outer circumferential surface thereof such that an electrostatic latent image formed on an image carrying member is developed by the toner; a developer carrying member configured to rotate in a first rotation direction while carrying two-component developer containing the toner and carrier on an outer circumferential surface thereof such that the toner is supplied to the toner carrying member; a layer thickness restricting portion disposed with a gap from the developer carrying member at a position that is, on an outer circumference of the developer carrying member, more on an upstream side in the first rotation direction than a position that faces the toner carrying member, and configured to restrict thickness of a layer of the two-component developer carried by the developer carrying member; a rotation control portion configured to, when developing is not performed, cause the developer carrying member to rotate in the first rotation direction and then to rotate in a second rotation direction that is reverse to the first rotation direction; and a developer carrying member difference voltage control portion configured to, in a non-developing forward rotation state in which the developer carrying member rotates in the first rotation direction when the developing is not performed, set a developer carrying member difference voltage to a voltage that is smaller than a developer carrying member reference voltage that is set when the developing is performed, the developer carrying member difference voltage being a voltage of the developer carrying member based on a potential of the toner carrying member under a bias voltage applied to between the toner carrying member and the developer carrying member.