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US 5,669,047 AGranted
Charging member, electrophotographic apparatus and charging method using the same
AssigneeCanon Kabushiki Kaisha
InventorsMasami Okuda, Hisami Tanaka, Junichi Kishi, Hiroyuki Ohmori, Takashi Koyama, Masafumi Hisamura
Life of this patent
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Abstract
A charging member for electrophotography comprising a surface layer, wherein the surface layer comprises a resin and an alkali metal salt contained therein.
Claims8
A device for providing contact charging comprising:
- an electrophotographic photosensitive member and a charging member, wherein the charging member has an electroconductive substrate and a surface layer thereon for contacting the electrophotographic photosensitive member, wherein the surface layer has a value of volume resistivity higher than that of the electroconductive substrate and comprises:
- (a) a resin selected from the group consisting of polyurethane resins and polycarbonate resins, and
- (b) an alkali metal salt contained therein, and wherein the electroconductive substrate is electrically connected to an external power supply and transfers a charge to an outer surface of said surface layer for contact charging the electrophotographic photosensitive member.
Dependencies are inferred from the claim text.