Patent ID: 8843035
Filing Date: 2014-09-23
Classification: G03G

Abstract:
1. A developing device, comprising: a developer bearing member which has a hollow cylindrical shape, is driven and rotated and includes a sleeve for bearing magnetic toner on a circumferential surface and a fixed magnet included inside the sleeve and having a plurality of magnetic poles in a circumferential direction of the sleeve; a layer restricting member which faces one magnetic pole out of the plurality of magnetic poles of the fixed magnet, is arranged at a distance from the sleeve and made of a magnetic material and restricts the thickness of the magnetic toner on the sleeve; a facing magnet which is arranged upstream of the layer restricting member in a rotation direction of the sleeve and at a distance from the sleeve, includes a first facing surface facing a position overlapping with a position with a maximum magnetic force of the one magnetic pole out of the plurality of magnetic poles in a radial direction and has a magnetic pole having the same polarity as the one magnetic pole on the first facing surface; and a nonmagnetic member which is connected at an upstream side of the facing magnet in the rotation direction and arranged at a distance from the sleeve.