Conductive roller and inspection method therefor

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

2005-12-28

2010-06-29

Omgba, Essama (Department: 3726)

Roll or roller

Concentric layered annulus

Specific composition

C492S009000, C492S011000, C492S053000, C399S176000, C029S895300, C029S895320, C029S895000

Reexamination Certificate

active

07744515

ABSTRACT:
A conductive roller which can form images of consistent quality and does not cause image failures such as formation of blank spots 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 to which conductivity has been imparted by carbon powder, wherein the conductive roller satisfies the relationship represented by formula (1):in-line-formulae description="In-line Formulae" end="lead"?Zr/Zc≧5  (1),in-line-formulae description="In-line Formulae" end="tail"?wherein Zr (Ω) represents a resistance component and Zc (Ω) represents a capacitive reactance component, the resistance component Zr (Ω) and the capacitive reactance component Zc (Ω) being calculated respectively from impedance Z (Ω) and phase difference θ, when the impedance Z (Ω) is measured upon application of an AC voltage of 0.2 V at a frequency of 1 Hz to the rubber elastic layer.

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