Patent ID: 7813680
Filing Date: 2010-10-12
Classification: G03G

Abstract:
1. A developing device comprising: a developer carrier, in which magnetic field generation means is arranged inside a non-magnetic hollow body, for carrying and transporting two-component developer comprising magnetic carrier and toner on the peripheral surface of said hollow body by a magnetic force of said magnetic field generation means; a developer housing unit that houses the two-component developer to be carried on said developer carrier; and a developer restriction member for restricting a layer thickness of the two-component developer carried on said developer carrier, wherein a developing region opposite a latent image carrier through which developing region the two-component developer that has been carried on said developer carrier by the magnetic force of said magnetic field generation means from within said developer housing unit passes after being restricted by said developer restriction member and returns to within the developer housing unit, said magnetic field generation means comprises a first magnetic pole and a second magnetic pole adjacent to each other for generating a magnetic force for removing from said developer carrier the two-component developer that has passed through the developing region, said second magnetic pole is arranged further on the downstream side in a developer transport direction of said developer carrier than said first magnetic pole, and on the outside of said magnetic field generation means a magnetic member is arranged that generates a magnetic field for displacing to the inside in the developer carrier axial direction magnetic force lines, which exert on the two-component developer on said developer carrier a peeling force by said first magnetic pole and said second magnetic pole in a direction of separation from said developer carrier, and which pass through developer carrier axial direction end regions within a developer separation region on said developer carrier.