Rubber member and developing roller composed of rubber member

Electrophotography – Image formation – Development

Reexamination Certificate

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C399S279000, C399S280000

Reexamination Certificate

active

07603067

ABSTRACT:
A developing roller composed of a rubber member including not less than two vulcanized rubber layers including a surface layer and a base layer. A hardness of the surface layer is set higher than that of the base layer. The hardness of the base layer is set to not more than 60 degrees in a JIS A hardness. A hardness of a laminate of all layers including the base layer and the surface layer is set to not more than 70 degrees in the JIS A hardness. An electric resistance value of the laminate is set to not more than 1010Ω, when the electric resistance value is measured by applying a voltage of 100V to the laminate at a temperature of 10° C. and a relative humidity of 20%.

REFERENCES:
patent: 5925893 (1999-07-01), Ishii et al.
patent: 6699631 (2004-03-01), Miyamoto et al.
patent: 2004/0067071 (2004-04-01), Hibino
patent: 2004/0110617 (2004-06-01), Mizumoto
patent: 2004/0190949 (2004-09-01), Yamaguchi et al.
patent: 2005/0078986 (2005-04-01), Nakamura et al.
patent: 2006/0018687 (2006-01-01), Nakade et al.
patent: 2006/0039721 (2006-02-01), Shiomura et al.
patent: 2004-170845 (2004-06-01), None
patent: 2005-225969 (2005-08-01), None

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