Charging roll
AssigneeNok Corporation
InventorsKosuke Oura, Shogo Suzuki, 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 average of heights of contours of convex portions on a surface of the surface layer relative to an average cylindrical surface obtained by averaging surface irregularities of the surface layer is equal to or greater than 2.0 micrometers and is equal to or less than 8.4 micrometers. The average of intervals between apexes of the convex portions on the surface of the surface layer is equal to or greater than 6.7 micrometers and is equal to or less than 39.8 micrometers.
Claims3
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,
- wherein an average of heights of contours of convex portions on a surface of the surface layer relative to an average cylindrical surface obtained by averaging surface irregularities of the surface layer is equal to or greater than 2.0 micrometers and is equal to or less than 8.4 micrometers, and
- wherein an average of intervals between apexes of the convex portions on the surface of the surface layer is equal to or greater than 6.7 micrometers and is equal to or less than 39.8 micrometers.
Dependencies are inferred from the claim text.