Patent ID: 8238801
Filing Date: 2012-08-07
Classification: G03G

Abstract:
1. A developing device that develops an electrostatic latent image on an image carrier by using a developer that contains a carrier and a toner, the developing device comprising: a developer carrier arranged so as to face the image carrier, a plurality of magnetic poles being formed on circumferential direction of the developer carrier; and a plurality of carrying members that form a developer circulation route by longitudinally carrying the developer inside a cavity in the developing device, the carrying members including wherein the developer carrier is formed such that two magnetic poles sandwiching the second magnetic pole have a same polarity and the second magnetic pole is formed by the two magnetic poles so that the polarity of the second magnetic pole differs from the polarity of the two magnetic poles, wherein the peak position of a magnetic flux density in a normal direction for each of the two magnetic poles are separated from each other by an angle of more than 180°, and wherein the second magnetic pole is inside an area within the angle of more than 180°.