Patent ID: 6975825
Filing Date: 2005-12-13
Classification: G03G

Abstract:
1. A developing apparatus for developing a latent image on an image bearing member with a toner, comprising: a developer container containing a magnetic developer including a toner containing a wax; a first developer carrying member rotatably provided in said developer container for carrying the magnetic developer to a first developing portion; a first magnet member fixedly disposed within said first developer carrying member, said first magnetic member having a plurality of magnetic poles comprising at least a first magnetic pole and a second magnetic pole; a regulation member for regulating a thickness of a layer of the magnetic developer carried on said first developer carrying member; a second developer carrying member, which is rotatable in an identical direction to said first developer carrying member, provided in said developer container on a side downstream from said first developer carrying member in a movement direction of the image bearing member so as to receive the magnetic developer from said first developer carrying member and carry the magnetic developer to a second developing portion; and a second magnet member fixedly disposed within said second developer carrying member, said second magnet member having a plurality of poles comprising at least a third magnetic pole and a fourth magnetic pole, wherein said first magnetic pole is disposed opposite to said second developer carrying member, and said second magnetic pole, which is a subsequent pole of said first magnetic pole, is disposed downstream from said first magnetic pole in a rotation direction of said first developer carrying member and has a polarity identical to a polarity of said first magnetic pole, wherein said third magnetic pole is disposed opposite to said first developer carrying member and has a polarity opposite to the polarity of said first magnetic pole, and wherein said third magnetic pole and said fourth magnetic pole generate a repulsive magnetic field on a developer container side at a peripheral surface of said second developer carrying member.