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AssigneeHokushin Corporation
InventorsMakoto Iwamura, Naoki Hirakawa, Masashi Yamazaki, Hitoshi Shirasaka
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The invention provides 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): Zr/Zc≧5 (1), wherein Zr (Ω) represents a resistance component calculated from impedance Z (Ω) and phase difference θ, and Zc (Ω) represents a capacitive reactance component, as measured upon application of an AC voltage of 0.2 V at a frequency of 1 Hz.
A conductive roller comprising 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);
A method for inspecting a 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 method comprises determining whether or not the relationship between resistance component Zr (Ω) calculated from impedance Z (Ω) and phase difference θ, and capacitive reactance Zc (Ω), as measured upon application of an AC voltage of 0.2 V at a frequency of 1 Hz, satisfies formula (1):
Dependencies are inferred from the claim text.