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US 12,743,037 B2Granted
Charging roll
AssigneeSynztec Co., Ltd.
InventorsShogo Suzuki, Atsushi Ikeda, Satoshi Fukuoka, Kenji Sasaki
Life of this patent
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Abstract
A charging roll includes a core, a rubber substrate arranged around the core, and a surface layer arranged around the rubber substrate. The surface layer includes a conductive matrix containing a base material formed of an insulator, and a conductive material dispersed in the base material, and particles of a surface roughness-imparting material dispersed in the conductive matrix. Each of the particles of the surface roughness-imparting material is formed of an insulator, is porous, and has a specific surface area of 8.7 m2/g or greater and 55 m2/g or less.
Claims7
A charging roll comprising:
- a core;
- a rubber substrate arranged around the core;
- and
- a surface layer arranged around the rubber substrate,
- wherein:
- the surface layer includes
- a conductive matrix containing a base material formed of an insulator, and a conductive material dispersed in the base material, and
- particles of a surface roughness-imparting material dispersed in the conductive matrix,
- each of the particles of the surface roughness-imparting material is formed of an insulator, is porous, and has a specific surface area of 8.7 m2/g or greater and 55 m2/g or less, and
- wherein the particles of the surface roughness-imparting material are contained in a proportion of 2% or greater and 4% or less of a weight of the surface layer.
7 more elements
Dependencies are inferred from the claim text.