Patent ID: 7848686
Filing Date: 2010-12-07
Classification: G03G

Abstract:
1. A developing device in which a two-component developer including at least carriers and toners is used and the toners are supplied to an image bearing member bearing an electrostatic latent image so that a toner image is developed from the electrostatic latent image, the developing device comprising: a developing roller so arranged as to oppose the image bearing member; and a magnetic roller so arranged as to oppose the developing roller, the magnetic roller retaining the two-component developer to supply toners to the developing roller, wherein the developing roller and the magnetic roller are rotationally driven in such directions as to be opposite from one another at an opposed position, and a magnetic pole of the magnetic roller and a magnetic pole of the developing roller have magnetic polarities different from one another at the opposed position, and a surface roughness of the magnetic roller is greater than a surface roughness of the developing roller.