Electrophotography – Image formation – Development
Reexamination Certificate
2008-09-11
2010-06-29
Gray, David M (Department: 2852)
Electrophotography
Image formation
Development
Reexamination Certificate
active
07747204
ABSTRACT:
A developing roller is provided which is soft enough to enable toners to be kept from deteriorating with time and cannot easily cause permanent set. The developing roller includes a mandrel, an elastic-material layer and a cover layer as a surface layer which covers the elastic-material layer. Asker-C hardness at the surface of the cover layer is from 40° to 85°. The cover layer has a thickness of from 15 nm to 5,000 nm. Martens hardness H1 (N/mm2) at the surface of the developing roller, Martens hardness H2 (N/mm2) of the elastic-material layer and the thickness d (mm) of the cover layer satisfy the relationship of the following expression (1):in-line-formulae description="In-line Formulae" end="lead"?400≦(H1−H2)/d≦2,000 (1).in-line-formulae description="In-line Formulae" end="tail"?
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Anan Genya
Satoh Hidenori
Yamauchi Ken'ichi
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Gray David M
Villaluna Erika
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