| 摘要 |
A fixing roller for an electrophotographic device has a cylindrical-shaped metallic base body, an insulation layer formed on an outer peripheral surface of the cylindrical-shaped metallic base body, and a resistance resin layer laminated on the insulation layer. The resistance resin layer is prepared using an injection-molding technique in which a die having a side gate structure is used as a resin-molding die. A major constituent of the resistance resin layer is selected from a polyphenylene sulfide resin, a polyphthalamide resin, and a liquid crystal polymer resin. In addition, the resistance resin layer also contains a mixture of carbon black and carbon fiber. Thus, the resistance resin layer has a specific volume resistance of 2 OMEGA cm or less in a direction along a central line of the cylindrical-shaped metallic base body. Both ends of the resistance resin layer are concentrically connected to ring-shaped metallic electrodes. Furthermore, the insulating layer is comprised of the same resin as that of the resistance resin layer.
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