Electrophotography – Image formation – Charging
Reexamination Certificate
2007-04-06
2010-02-23
Gray, David M (Department: 2852)
Electrophotography
Image formation
Charging
C399S100000, C399S111000
Reexamination Certificate
active
07668484
ABSTRACT:
The invention delivers a charging roller which is capable of preventing current leakage to a photoreceptor throughout life-time and which has a stable resistance value throughout life-time. The charging roller contains a metal core and a rubber layer formed on the core. The rubber layer is an epichlorohydrin-based rubber base material to which an electronic conductive agent and an ionic conductive agent are added. The rubber layer is subjected to surface processing by spraying the surface with a solution containing an isocyanate compound and heating. The amount of the electronic conductive agent added to the rubber base material is limited so that a volume resistivity when only the electronic conductive agent is added to the rubber base material is 1.46×106Ω·cm or greater. In addition, the amount of the added ionic conductive agent is increased so that a volume resistivity when the electronic conductive agent and the ionic conductive agent are added to the rubber base material is 1.93×106Ω·cm or less.
REFERENCES:
patent: 5321482 (1994-06-01), Yano et al.
patent: 5589924 (1996-12-01), Yano et al.
patent: 6311031 (2001-10-01), Hirano
patent: 6391511 (2002-05-01), Okamoto et al.
patent: 2001/0055687 (2001-12-01), Hoshi
patent: 2003/0118372 (2003-06-01), Kitano et al.
patent: 2004/0151997 (2004-08-01), Miyamoto et al.
patent: 5-66698 (1993-03-01), None
patent: 05-281830 (1993-10-01), None
patent: 2000-066528 (2000-03-01), None
patent: 2000-276001 (2000-10-01), None
patent: 2000-346051 (2000-12-01), None
patent: 2001-348443 (2001-12-01), None
patent: 2002-040760 (2002-02-01), None
patent: 2002-082514 (2002-03-01), None
patent: 2002-139911 (2002-05-01), None
patent: 2004-45512 (2004-02-01), None
patent: 2004-191960 (2004-07-01), None
patent: 2004-191961 (2004-07-01), None
patent: 2005-043703 (2005-02-01), None
patent: 2005-121982 (2005-05-01), None
patent: 2005-292454 (2005-10-01), None
patent: 2006-039031 (2006-02-01), None
patent: 2006-053544 (2006-02-01), None
Kagawa Toshiaki
Sakuwa Tohru
Shinkawa Kouji
Gray David M
Nixon & Vanderhye PC
Sharp Kabushiki Kaisha
Yi Roy
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