Patent ID: 9250564
Filing Date: 2016-02-02
CPC Classification: G03G

Claim Text:
1. A developing device comprising: a developer bearing member configured to bear a developer on a surface thereof in order to supply the developer to an image bearing member, the developer bearing member having a first dielectric portion and a second dielectric portion in the surface thereof; a regulating member configured to regulate a thickness of a layer of the developer carried by the developer bearing member; and a flexible sheet-like charging auxiliary member disposed so as to be in contact with the developer bearing member at a position downstream of a contact portion between the developer bearing member and the image bearing member and upstream of a contact portion between the developer bearing member and the regulating member in a rotational direction of the developer bearing member, the charging auxiliary member charging the developer carried by the developer bearing member, wherein in a triboelectric series, the charging auxiliary member is positioned between the first dielectric portion and the second dielectric portion.