Patent ID: 8406661
Filing Date: 2013-03-26
Classification: G03G

Abstract:
1. A developing device, comprising: a developing roller incorporating a fixed magnet body having a plurality of magnetic poles in a circumferential direction, for supplying developer to a developing region facing an image carrier; a regulating member for regulating an amount of developer on the developing roller so as to form a developer layer region on the developing roller by means of a magnetic field formed by the regulating member and the plurality of magnetic poles of the fixed magnet body, which face the regulating member; and a magnetic-field generating member for scraping off, on an upstream of the regulating member in a rotational direction of the developing roller, developer which is not used for development on the developing roller, wherein the following relation Bm/Br>1 is satisfied, where Bm represents a magnetic flux density of a distal end portion of the magnetic-field generating member facing a surface of the developing roller and Br represents a magnetic flux density of a distal end portion of the regulating member facing the surface of the developing roller.