| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive heating device of high fixing efficiency capable of both ensuring the ability to fix the entire recording material evenly and preferably and preventing malfunction of a safety element and an image forming device equipped with the heating device. SOLUTION: In a film heating type heating device having a plurality of resistance heating elements of different widths and an image forming device equipped with the heating device, only the widest resistance heating element is provided with a restriction portion formed by reducing the width of only one part in the longitudinal direction of the heating element. The restriction portion is positioned where the heating element is in contact with a safety element having a mechanism for shutting off current to the resistance heating element when a failure occurs. The substrate of the heating element is accommodated in the fixing nip region and a plurality of resistance heating elements is disposed in place on the entire width of the substrate. COPYRIGHT: (C)2008,JPO&INPIT
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