Contact charging member, image forming unit including the contact charging member and electrophotographic image forming apparatus including the image forming unit

A contact charging roller (11) which is in contact with and electrically charges a photosensitive drum (16) is provided on a center shaft (11-1), and includes a roller-shaped conductive foam material portion (11-2) covering the shaft, and a tubular-shaped conductive resin material portion (11-3) cov...

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Bibliographische Detailangaben
Hauptverfasser:	YORIFUJI, TAKAO, KANASUGI, MASAKI, ONO, NORIKI, KOUROKU, MORIYUKI, ABE, TETSUYA
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BEARINGS BLASTING CINEMATOGRAPHY ELECTROGRAPHY ELECTROPHOTOGRAPHY ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FLEXIBLE SHAFTS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING HOLOGRAPHY LIGHTING MAGNETOGRAPHY MECHANICAL ENGINEERING PHOTOGRAPHY PHYSICS ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A contact charging roller (11) which is in contact with and electrically charges a photosensitive drum (16) is provided on a center shaft (11-1), and includes a roller-shaped conductive foam material portion (11-2) covering the shaft, and a tubular-shaped conductive resin material portion (11-3) covering the foam portion. The foam portion has an electric resistance of 9 x 10 OMEGA or less, the resin portion includes conductive agents and has a surface electric resistance in a range from 1 x 10 OMEGA / &squ& or more to 9 x 10 OMEGA / &squ& or less, and a hardness of the charging roller as a whole is Asker F 90 DEG or less. An image forming unit includes the charging member and the drum. An electrophotographic image forming apparatus supplies a recording paper to the unit, transfers an image from the drum to the paper, and discharges the image-transferred paper.