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

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

A roller-shaped contact charging member which is in contact with and electrically charges a photosensitive drum is provided on a center shaft, and includes a roller-shaped conductive foam material portion covering the shaft, and a tubular-shaped conductive resin material portion covering the foam po...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: ONO, NORIKI, ABE, TETSUYA, KANASUGI, MASAKI, KOUROKU, MORIYUKI, YORIFUJI, TAKAO
Format: Patent
Sprache:eng
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 roller-shaped contact charging member which is in contact with and electrically charges a photosensitive drum is provided on a center shaft, and includes a roller-shaped conductive foam material portion covering the shaft, and a tubular-shaped conductive resin material portion covering the foam portion. The foam portion has an electric resistance of 9x105 OMEGA or less, the resin portion includes conductive agents and has a surface electric resistance in a range from 1x105 OMEGA / &squ& or more to 9x107 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.