Patent ID: 8175502
Filing Date: 2012-05-08
Classification: G03G

Abstract:
1. A developing device, comprising: a developing roller to bear developer, including magnetic carriers and toner, on a circumferential surface thereof, so as to develop a latent image formed on an image bearing member; and a developer supplying section to supply the developer onto the developing roller; wherein the developing roller is provided with: wherein, when a reference position is defined as such a position that exhibits a maximum value of a magnetic flux density to be generated in a normal direction by the peeling magnetic pole, a magnetic-flux density flat region within which the magnetic flux density is kept at substantially a constant value being closely approximate to the maximum value of the magnetic flux density and the reference position is included, exists while fulfilling an Equation indicated as follow: where numeral Z indicates an angle of the developing roller in the magnetic-flux density flat region.