| 摘要 |
PROBLEM TO BE SOLVED: To eliminate trouble that the temperature of a coil arranged inside a heat roller rises by the heat generation of the coil itself or radiant heat from the heat roller in an IH type fixing roller. SOLUTION: A cylindrical bobbin 10 round which the coil 11 is wound is arranged inside the heat roller 1, and blowholes 10a communicating with the inside and the outside of the cylinder are equally formed over the entire surface of the bobbin 10. Furthermore, air is sent from both ends of the coil 11 toward the inside of the coil 11 by an air blowing means such as a fan. Thus, the forcibly sent cooling air flows in the normal direction of the coil 11 while taking away the heat of a coil wire when it passes through the blowholes 10a of the bobbin 10 and further passes through the gap of the coil wire, and then it is exhausted to the outside of the roller 1. Therefore, the coil 11 is effectively cooled and failure caused by the overheat of the coil 11 is prevented in advance.
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