Charging roller, electrophotographic process cartridge, and...

Details Charging roller, electrophotographic process cartridge, and... Charging roller, electrophotographic process cartridge, and...

2007-05-16

2009-08-25

Ngo, Hoang (Department: 2852)

Electrophotography

Image formation

Charging

Reexamination Certificate

active

07580655

ABSTRACT:
A charging roller including: a support; an elastic layer provided on the outer peripheral surface of the support, and having a ground-finished outer peripheral surface; and a surface layer formed to cover the outer peripheral surface of the elastic layer and that has a thickness of about 2 μm to about 10 μm from the outer peripheral surface of the elastic layer, and a proportion of water absorbed in the total of the elastic layer and the surface layer, after storage for 48 hours in an environment having a temperature of 10° C. and a humidity of 15% RH, and after storage for 48 hours in an environment having a temperature of 28° C. and a humidity of 85% RH, being about 2% to about 8% by weight, being about 2% to about 8% by weight.

REFERENCES:
patent: 6317574 (2001-11-01), Shinohara et al.
patent: 6620476 (2003-09-01), Tarnawskyj et al.
patent: A-47-30330 (1972-11-01), None
patent: A-08-176293 (1996-07-01), None
patent: A-08-208820 (1996-08-01), None
patent: B2-3026290 (2000-01-01), None
patent: A-2001-350351 (2001-12-01), None

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