Patent ID: 6072155
Filing Date: 2000-06-06
Classification: G03G,H05B

Abstract:
A fixing apparatus comprising a fixing beating roller for heating a recording medium on which a recording material is deposited, and a pressing roller for transporting the recording medium while interposing the recording medium between the fixing heating roller and the pressing roller, the fixing heating roller including:a hollow main roller body; anda sheet-shaped insulative film provided on and along an inner circumferential surface of the main roller body, the sheet-shaped insulative film having a pattern of a resistance heat-generating element formed on the insulative film and an electrode pattern connected to the pattern of the resistance heat-generating element, wherein:a margin is provided between the electrode pattern and at least one of edges of the insulative film, and the margin has a size which is not less than a distance that conforms to the UL1950 standard with respect to a voltage supplied to the resistance heat-generating element, the insulative film is arranged on the inner circumferential surface of the main roller body so that the edges of the insulative film in a circumferential direction are overlapped with each other, and the pattern of the resistance heat-generating element is formed in an overlapped area at the inner edge disposed on a side of a center of rotation of the main roller body, of the overlapped edges of the insulative film, and the resistance heat-generating element, which is formed in the overlapped area, has an amount of heat generation larger than that of the resistance heat-generating element formed on the other portions of the pattern.