| 摘要 |
PROBLEM TO BE SOLVED: To provide a fixing device where an electromagnetic induction heating layer of a fixing roller is made to uniformly generate heat in the direction of a rotation center axis of the roller, which is rich in durability, and where respective parts are arranged so as to achieve the miniaturization and the space saving of the entire device. SOLUTION: The fixing device includes: the fixing roller 1; a pressure roller 2 made to press-contact with the fixing roller 1; and a magnetic flux generating device 3 making the electromagnetic induction heating layer 16 of the fixing roller 1 generate the heat. The excitation coil 31 of the magnetic flux generating device 3 is formed to wind in shape extended long in a direction orthogonal to the conveying direction of a recording material P. A distance Lc1 between the inside parts of the bent parts at both ends in the direction orthogonal to the conveying direction of the recording material of the coil 31, the entire length L1 in the direction of the rotation center axis line of the fixing roller 1, the entire length L2 in the direction of the rotation center axis line of the pressure roller 2, and the conveying width Lp in the direction orthogonal to the conveying direction of the recording material of maximum size out of recording material sizes large enough to perform toner image fixing processing, satisfy the relation of Lc1≥L1>L2>Lp. COPYRIGHT: (C)2007,JPO&INPIT
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