Conductive roll
AssigneeBridgestone Corporation
InventorsTadashi Utsunomiya, Yoshinori Shimokawa, Minoru Toyoda
Life of this patent
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Abstract
The conductive roll accordin g to the present invention can be used for develop ing, charging, destaticizing and transferring images of electrophotography as the roll can be tightly contacted against a photosensitive member for uniform charging of the potential. The conductive roll is constructed to minimize contamination of the photosensitive member. The conductive roll includes a highly conductive shaft provided at the core, an intermediate layer provided on the outer peri phery of the shaft and is made of a conductive and elastic material or a foamed member of such material, and a coated film layer provided on the outer periphery of the intermediate layer having a high resistance.
Claims17
A conductive roll comprising a conductive shaft provided at a core, an intermediate layer provided on an outer periphery of said shaft and having means for imparting electrical conductivity and having elasticity, and a coated film layer provided on the outer periphery of said intermediate layer and having a resistivity higher than that of the intermediate layer, and said intermediate layer is made of a non-foamed or foamed elastic member selected from the gorup consisting of silicone rubber, urethane rubber, polybutadiene base urethane rubber, polynorbornane rubber, natural rubber, polybutadiene rubber, polyisoprene rubber, styrene butadiene rubber, acrylonitrile rubber, ethylene propylene diene rubber, acrylic rubber, epichlorohydrin rubber, ethylene vinyl acetate rubber, fluororubber and mixtures thereof.
Dependencies are inferred from the claim text.