Electrophotography – Image formation – Charging
Reexamination Certificate
2007-01-22
2009-12-01
Grainger, Quana M (Department: 2852)
Electrophotography
Image formation
Charging
Reexamination Certificate
active
07627270
ABSTRACT:
A charging device for applying a voltage to a latent image carrier of an image forming apparatus includes a brush roller, a voltage applying mechanism, and a driving mechanism. The brush roller includes a shaft and a brush. The brush has an oblique brush amount, and is disposed on an outer surface of the shaft while being disposed to a surface of the latent image carrier such that the brush roller is abutted with a brush contact amount. This brush is configured to uniformly charge the surface of the latent image carrier. The voltage applying mechanism is configured to apply a charging voltage to the brush roller. The driving mechanism is configured to drive the brush roller at a predetermined rotation number to satisfy a relationship Z>150−50 A, where Z is a rotation number (rpm) of the brush roller, and A is the oblique brush amount (mm).
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Grainger Quana M
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh Co. Ltd.
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