| US 7,580,655 B2 | ||
| Charging roller, electrophotographic process cartridge, and image forming apparatus | ||
| Hidemi Nukada, Kanagawa (Japan); Shigeto Hashiba, Kanagawa (Japan); Takahiro Suzuki, Kanagawa (Japan); Koji Bando, Kanagawa (Japan); and Makoto Takemoto, Kanagawa (Japan) | ||
| Assigned to Fuji Xerox Co., Ltd., Tokyo (Japan) | ||
| Filed on May 16, 2007, as Appl. No. 11/798,745. | ||
| Claims priority of application No. 2006-298981 (JP), filed on Nov. 02, 2006. | ||
| Prior Publication US 2008/0107451 A1, May 08, 2008 | ||
| Int. Cl. G03G 15/02 (2006.01) | ||
| U.S. Cl. 399—176 | 20 Claims |
| 1. A charging roller comprising:
a support;
an elastic layer that is provided on the outer peripheral surface of the support, the elastic layer having a ground-finished
outer peripheral surface; and
a surface layer that is 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, being about 2% to about 8% by weight, 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 28° C. and a humidity of 85% RH, being about 2% to about 8% by weight.
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