| 摘要 |
PURPOSE: To produce a fixing heat roller in good yield by providing a heating resistor layer of the mixture of glass and conductive material on an insulating layer consisting of an org. resin and specifying the ratio of the centerline average roughness to the maximum depth of the surface. CONSTITUTION: A heating resistor layer 4 is provided on the outer peripheral surface of a metallic pipe 2 of aluminum, etc., having 0.5-1mm wall thickness through an insulating layer 3 consisting of an org. resin such as polyimide, a releasable layer 5 is formed on the outermost surface, and an annular electrode 6 is fixed to both ends of the resistor layer 4 to constitute the roller. The resistor layer 4 consists of the mixture of crystallized glass having <=500 deg.C softening point and a metallic material such as Ag or a conductive material of the oxide such as Re2 O3 , and the thickness is controlled to 5-100μm. Further, the centerline average roughness Ra and maximum depth Rmax* on the layer 4 surface are limited to conform to Ra/Rmax*<0.5. Consequently, the gas generated in the pore is liberated from the pore in the layer 4, and the adhesion of the releasable layer is enhanced.
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