| 摘要 |
In a fixing device, a magnetic flux generated by a coil passes through a magnetic circuit made of a heat generating layer of a fixing member and a magnetic substance core. The magnetic substance core includes a plurality of main cores each having an elongated form along a circumferential direction of the fixing member and arrayed at intervals along a width direction of a sheet. The end row main cores have a second shape effectively closer to an outer peripheral face of the fixing member compared to a first shape possessed by the central row main cores so as to enhance density of the magnetic flux, which passes the magnetic circuit, more in end sections than in a central section with respect to width direction of the sheet.
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