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US 11,480,886 B2Granted
Charging roll
AssigneeNok Corporation
InventorsAsami Uematsu, Atsushi Ikeda, Shogo Suzuki, Kosuke Oura, Satoshi Fukuoka, Kenji Sasaki
Life of this patent
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Abstract
A charging roll includes a core member, a rubber base material disposed around the core member, and a surface layer disposed around the rubber base material. The ten point height of irregularities RZ of a surface of the surface layer is equal to or greater than 3.9 micrometers, and is equal to or less than 6.1 micrometers. The mean spacing between peaks Sm of the surface of the surface layer is equal to or greater than 12.5 micrometers and is equal to or less than 13.5 micrometers.
Claims2
A charging roll comprising:
- a core member;
- a rubber base material disposed around the core member;
- and
- a surface layer disposed around the rubber base material,
- a ten point height of irregularities RZ of a surface of the surface layer being equal to or greater than 3.9 micrometers and being equal to or less than 6.1 micrometers, and a mean spacing between peaks Sm of the surface of the surface layer being equal to or greater than 12.5 micrometers and being equal to or less than 13.5 micrometers,
- wherein the surface layer comprises an electroconductive matrix comprising a base material formed an electric insulator and an electroconductive material being dispersed in the base material, and particles of a surface roughness enhancing material being dispersed in the electroconductive matrix,
- wherein the base material is formed of urethane resin, and
- wherein the particles of the surface roughness enhancing material are formed of urethane.
5 more elements
Dependencies are inferred from the claim text.