Canon Kabushiki Kaisha

Yuji Ishihara

Hiroshi Inoue

Tsutomu Kukimoto

Tsuyoshi Takiguchi

Takashi Tanaka

Shuichi Aita

Kiyoshi Mizoe

Fumihiro Arahira

Tetsuya Kuribayashi

Shigemori Tanaka

Naoki Fuei

Yoshifumi Hano

A process cartridge has an electrophotographic photosenstive member and a conducting member disposed in contact with the electrophotographic photosenstive member and to which a voltage is to be applied. The electrophotographic photosensitive member and conducting member are supported as one unit and are detachably mountable to the main body of an electrophotographic apparatus. The electrophotographic photosenstive member has a support, and provided thereon are a charge generation layer and a charge trasport layer in this order. The charge transport layer having a thickness of from 12 &mgr;m to 40 &mgr;m and the conducting member has a conductive support and a covering layer provided thereon. The time constant &tgr; of electric current of the conducting member is 0.1 second or shorter.

Process cartridge and electrophotographic apparatus

A charging apparatus which comprises an electrophotographic photosensitive member and a charging member which comprises magnetic particles and placed in contact with the electrophotographic photosensitive member to charge the electrophotographic photosensitive member upon application of a voltage, wherein each magnetic particle has a surface layer containing a polyolefin resin of which weight average molecular weight is 10,000 or more, and has a volume resistivity of 1.times.10.sup.4 to 1.times.10.sup.11 .OMEGA.cm.

Charging apparatus and electrophotographic apparatus

The present invention provides a contact charging member having a conductive layer free from resistance unevenness, comprising a conductive pigment and at least two kinds of polymeric elastic materials A and B, wherein the elastic material A has a higher affinity for the conductive pigment than the elastic material B.

Contact charging member, contact charging method making use of it, and

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Kawasaki, Japan

Yuji Ishihara