Synztec Co., Ltd.

Shinobu Hasegawa

Junya Hoshi

Takeshi Yanobe

Masashi Yamazaki

Takashi Noda

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:|&#x3b8;/&#x3b8;|&#x2266;5,&#x2003;&#x2003;[F1]wherein &#x3b8;represents the maximum value of phase difference &#x3b8; as measured upon application of an AC voltage of 1.0 V within a frequency range of 100 mHz to 10 kHz, and &#x3b8;represents the minimum value of phase difference &#x3b8; as measured under the same conditions.

Conductive roller and inspection method therefor

A method of manufacturing a two-layer roll having a foamed elastic layer provided on a core, and an elastic layer provided on the foamed elastic layer includes the steps of forming the elastic layer by use of a cylindrical mold holding a first cylindrical member used to form the outer cylindrical surface of the elastic layer, the first cylindrical member being manufactured by means of machining a solid member; forming a solid primary layer on the core by means of side extrusion; setting the formed elastic layer and the core having the solid primary layer formed thereon in a second cylindrical member of a foaming mold; and foaming the solid primary layer into the foamed elastic layer to form the two-layer roll having the formed elastic layer and the elastic layer.

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Yokohama, Japan

Shinobu Hasegawa