Electrophotography – Internal machine environment – Particle or contaminant control
Reexamination Certificate
2006-11-21
2006-11-21
Grimley, Arthur T. (Department: 2852)
Electrophotography
Internal machine environment
Particle or contaminant control
C399S176000
Reexamination Certificate
active
07139504
ABSTRACT:
A charging device including: a charging roller having a metal cylinder and an elastic layer located on the metal cylinder; a cleaner configured to clean the charging roller, which includes an electroconductive brush roller including a roller having a shaft; and hair located overlying the roller, wherein the hair includes a fiber which has a width of from 0.1 to 20 denier, and a length of from 0.3 to 2.5 mm and which is planted at a density of from 7,000 to 46,000 lines/cm2, and a member configured to impart substantially the same potential as that of the charging roller to the electroconductive brush roller when a bias voltage is applied to the charging roller. A process cartridge and an image forming apparatus including the charging device are also provided.
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Kawasumi Masanori
Koike Toshio
Kumagai Naohiro
Murakami Eisaku
Nagashima Hiroyuki
Gleitz Ryan
Grimley Arthur T.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh Company Limited
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