| 摘要 |
A heating apparatus which can increase the temperature of a heating element to a target temperature in a short time and ensures temperature uniformity of the heating element. In the heating apparatus, when the specific resistance of a material of a heat generating layer of a heating roller is &rgr; (μ′&OHgr;cm), the average thickness of the heat generating layer is 5&rgr; (μm) or more but not more than 15&rgr; (μm), and the thickness error is 1.2&rgr; (μm) or less. For instance, when the heat generating layer is copper having a specific resistance of 1.7 (μ′&OHgr;cm), the average thickness of the heat generating layer is 8-25 (μm), and the thickness error is 2 (μm) or less. Thus, the heating roller having a short heat increasing time and excellent temperature uniformity is provided. |
