Charging roll whose resistance adjusting layer contains insulating particles dispersed therein
AssigneeTokai Rubber Industries, Ltd.
InventorsAtsuhiro Kawano, Kenichi Tsuchiya
Life of this patent
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Abstract
A charging roll comprising a center shaft an electrically conductive rubber layer formed on an outer circumferential surface of the center shaft and having a relatively low hardness a resistance adjusting layer formed radially outwardly of the conductive rubber layer and a protective layer formed radially outwardly of the resistance adjusting layer. The resistance adjusting layer is formed of a rubber composition prepared by mixing a rubber material with particles of an electron-conductive material and particles of an electrically insulating material. The rubber composition comprises 10-50 parts by weight of the electrically insulating material per 100 parts by weight of the electron-conductive material.
Claims18
A charging roll comprising:
- a center shaft;
- an electrically conductive rubber layer formed on an outer circumferential surface of said center shaft and having a relatively low hardness;
- a resistance adjusting layer formed radially outwardly of said conductive rubber layer;
- and
- a protective layer formed radially outwardly of said resistance adjusting layer,
- said resistance adjusting layer being formed of a rubber composition prepared by mixing together three separate materials comprising a rubber material, particles of an electron-conductive material and particles of an electrically insulating material, said rubber composition comprising 10-50 parts by weight of said electrically insulating material per 100 parts by weight of said electron-conductive material.
Dependencies are inferred from the claim text.