Patent ID: 9329519
Filing Date: 2016-05-03
CPC Classification: G03G

Claim Text:
1. A charging roller to apply voltage to a target to charge the target, wherein a color of a surface of the charging roller is in one of a range according to CIE L*a*b* color space and a range according to CIE XYZ color space, the range according to CIE L*a*b* color space is defined as: 32.6≦L*≦50.9, 0.51≦a*≦1.12, and 6.0≦b*≦8.4, and the range according to CIE XYZ color space is defined as: 8.8≦X≦21.0, 9.1≦Y≦21.3, and 5.7≦Z≦11.8, wherein CIE is the International Commission on Illumination, L is luminance, a and b are color channels and XYZ are color directions and wherein a resistance of the charging roller is calculated using a measured color of the surface of the charging roller measured contactlessly and according to a preliminarily established relation between the resistance of the charging roller and the color of the surface of the charging roller.