Conductive roller and inspection method therefor

Details Conductive roller and inspection method therefor Conductive roller and inspection method therefor

2011-03-01

2011-03-01

Bryant, David P (Department: 3726)

Roll or roller

Concentric layered annulus

Specific composition

C029S895320

Reexamination Certificate

active

07896791

ABSTRACT:
To provide a conductive roller which does not cause defective images with, for example, black lines, which would otherwise be caused by current leakage due to aggregation of carbon black particles or a similar phenomenon, and a method for inspecting the roller.The conductive roller having a metallic core and at least one rubber elastic layer provided on the outer peripheral surface of the core, the rubber elastic layer being formed from a conductive rubber which has ion conductivity and which contains carbon black micropowder, characterized in that said rubber elastic layer satisfies the relationship represented by the following formula:in-line-formulae description="In-line Formulae" end="lead"?|θmax/θmin|≦5,  [F1]in-line-formulae description="In-line Formulae" end="tail"?wherein θmaxrepresents the maximum value of phase difference θ as measured upon application of an AC voltage of 1.0 V within a frequency range of 100 mHz to 10 kHz, and θminrepresents the minimum value of phase difference θ as measured under the same conditions.

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