Electrophotography – Image formation – Development
Reexamination Certificate
2008-12-10
2011-11-29
Gray, David (Department: 2852)
Electrophotography
Image formation
Development
C399S277000
Reexamination Certificate
active
08068771
ABSTRACT:
A developing unit includes a developing hopper for storing a dual-component developer. In the developing hopper, an opening portion is formed at the position opposing the outer peripheral surface of a photoreceptor drum. A developing roller for supplying the developer to the photoreceptor drum to develop an electrostatic latent image is provided inside the developing hopper. The developing roller has a multi-pole magnetic member having a multiple magnetic poles and a non-magnetic sleeve. The multi-pole magnetic member has a multiple number of magnetic poles radially arranged apart from each other. The photoreceptor drum incorporates an opposing magnetic pole formed of a bar magnet having a rectangular section, disposed at a position opposing the magnetic pole across a photosensitive layer. The opposing magnetic pole has a polarity dissimilar to that of the main magnetic pole.
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Gray David
Nixon & Vanderhye P.C.
Sharp Kabushiki Kaisha
Villaluna Erika J
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