Charging device, process cartridge, image forming apparatus,...

Details Charging device, process cartridge, image forming apparatus,... Charging device, process cartridge, image forming apparatus,...

2011-08-16

2011-08-16

Gray, David M (Department: 2852)

Electrophotography

Internal machine environment

Particle or contaminant control

C399S176000

Reexamination Certificate

active

08000627

ABSTRACT:
The present invention provides a charging device which comprises a charging roller (14a) and a cleaning component (14b). The charging roller charges a surface of an image-recording medium (11) with a voltage which is applied from an external source. The cleaning component cleans a surface of the charging roller. The charging roller includes a resistance adjustment layer which is made of a resin composite and formed on an outer periphery of a core metal. The hardness of the charging roller is 45 degrees or more in JIS D hardness. The cleaning component has a portion which is in contact with the charging roller. This portion is made of resin foam which has a continuous foam structure. The density of the resin foam is 5 to 15 kg/m3and its tensile strength is 1.7±0.5 kg/cm2.

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