Abstract A heat-fixing apparatus for use in an electrophotographic apparatus such as a copying machine. It comprises a substrate roller formed of a material having a heat conductivity of 0.7 kcal/mhk or less, a resistant heat-generating layer provided on the surface of the roller, and a surface coat layer provided on the resistance heat-generating layer. This heat-fixing apparatus has a very high heat efficiency, and can perform heat-fixing of a toner at a low consumption of electric power. In addition, since the heating is carried out rapidly, the rising time is markedly shortened, and it is not necessary to perform pre-heating. In this respect, too, the electric power to be consumed is decreased. Furthermore, since it is a roller-type fixing method, it can effectively cope with high-speed copying. Moreover, because the apparatus has a large strength, the apparatus can be effectively made light in weight.
A heat-fixing apparatus comprising a substrate roller formed from a material having a heat conductivity of 0.7 kcal/mhk or less, a resistance heat generating layer provided on the surface of the roller and a surface coat layer provided on the resistance heat generating layer.
Claim 2
Dependent Claim
16 words
A heat-fixing apparatus of claim 1 wherein the substrate roller is composed of a non-metallic material.
Claim 3
Dependent Claim
25 words
A heat-fixing apparatus of claim 2 wherein the non-metallic material is a heat-resistant glass, an imide resin, a phenol resin or an aromatic polyamide resin.
Claim 4
Dependent Claim
20 words
A heat-fixing apparatus of claim 1 wherein a heat insulating material is filled in the inside of the substrate roller.
Claim 5
Dependent Claim
17 words
A heat-fixing apparatus of claim 1 wherein the surface coat layer is formed of a fluorine-containing resin.
Claim 6
Dependent Claim
17 words
A heat-fixing apparatus of claim 5 wherein a conductive agent is dispersed in the surface coat layer.
Claim 7
Dependent Claim
19 words
A heat-fixing apparatus of claim 5 wherein the thickness of the surface coat layer is 10 to 20 µm.
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