Patent ID: 8185024
Filing Date: 2012-05-22
Classification: G03G

Abstract:
1. A developing unit comprising: a developer retainer that includes a magnet member and a retaining member, the magnet member having magnetic poles, the retaining member being provided on an outer circumference of the magnet member and retaining a developer having magnetism to be attracted on a surface of the retaining member by a magnetic force of the magnet member; a developing vessel that receives the developer internally, and that includes a retainer receiving portion, a first agitation portion and a second agitation portion, the retainer receiving portion receiving the developer retainer, the first agitation portion being adjacent to the retainer receiving portion, the second agitation portion being adjacent to the first agitation portion; a first conveyance member that is received in the first agitation portion and that conveys the developer in the first agitation portion in a first conveyance direction; a second conveyance member that is received in the second agitation portion and that conveys the developer in the second agitation portion in a second conveyance direction which is reverse to the first conveyance direction; and a magnetic member that is disposed between the second conveyance member and the developer retainer and that has magnetism, wherein the magnetic member includes a wall surface forming member which forms a wall surface of the second agitation portion.