Electrophotography – Image formation – Charging
Reexamination Certificate
2007-07-06
2009-06-30
Tran, Hoan H (Department: 2852)
Electrophotography
Image formation
Charging
C399S111000, C399S115000, C399S176000
Reexamination Certificate
active
07555243
ABSTRACT:
A charging member, which can be provided in a process cartridge and/or in an image forming apparatus, includes a conductive supporting member, an electrical resistance control layer formed on an outer circumferential surface of the conductive supporting member, and a nonconductive gap retaining member configured to retain a gap between the conductive supporting member and an image carrying member closely disposed to each other to have a constant distance. At least a portion of the nonconductive gap retaining member is mounted on the electrical resistance control layer at both ends of the conductive supporting member, and a circumference of the nonconductive gap retaining member projects from the electrical resistance control layer. An amount of projection of the gap retaining member from the electrical resistance control layer decreases as the gap retaining member tapers in a direction toward a center of an image formation region.
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Hashimoto Shunichi
Kawasumi Masanori
Kayahara Shin
Kimura Yoshiyuki
Murakami Eisaku
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
Tran Hoan H
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