Contact charging member, image forming unit including the...

G - Physics – 03 – G

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G03G 15/02 (2006.01) G03G 15/04 (2006.01) G03G 15/22 (2006.01)

Patent

CA 2235795

A roller-shaped contact charging member which is in contact with and electrically charges a photo-sensitive 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 9 x 10 5 .OMEGA. or less, the resin portion includes conductive agents and has a surface electric resistance in a range from 1 x 10 5 .OMEGA./~ or more to 9 x 10 7 .OMEGA./~ or less, and a hardness of the charging roller as a whole is Asker F 90° 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.

Un élément de charge par contact en forme de rouleau qui est en contact avec un tambour photosensible qu'il charge est monté sur un axe central; l'axe est recouvert d'une mousse conductrice en forme de rouleau et un tube formé de résine conductrice recouvre la partie en mousse. La partie en mousse présente une résistance électrique de 9 X 10 5 ohms, ou moins, la partie en résine comporte des agents conducteurs et elle présente une résistance électrique de surface dans la plage de 1 X 10 5 ohms ou plus, à 9 x 10 7 ohms ou moins, et la dureté d'ensemble du rouleau de charge est de 90 degrés Asker F ou moins. Un module de formation d'image comprend l'élément de charge et le tambour. Un dispositif photoélectrique de formation d'image fournit du papier à enregistrer au module, transfère une image du tambour au papier et décharge le papier sur lequel l'image a été transférée.

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