| 摘要 |
PROBLEM TO BE SOLVED: To equalize a temperature distribution in the rotation axis direction of a rotating body of a fixing part, in a heating device of an image forming apparatus. SOLUTION: The heating device is provided with a heat generation member having magnetism and conductivity, and an excitation coil 105 disposed oppositely to the heat generation member for causing the heat generation member to generate heat by electromagnetic induction. The heating device is so structured that the magnetic field intensity generated from the excitation coil 105 in a part between both ends of the excitation coil is set smaller than those at both the ends thereof, whereby temperature drop at an end of a fixing device can be improved without increasing power supplied to a heating element nor increasing the rise time of the temperature of the heating element; and the temperature distribution in the entire fixing part can be equalized by adjusting the shape of the cross section of the excitation coil 105. COPYRIGHT: (C)2005,JPO&NCIPI |
