| CPC G03G 15/2057 (2013.01) [G03G 15/2042 (2013.01); G03G 15/206 (2013.01)] | 15 Claims |
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1. A fixing unit comprising:
a rotary member that includes a conductive layer and that is formed in a tubular shape extending in a longitudinal direction of the rotary member;
a magnetic core inserted in an interior space of the rotary member; and
an energizing coil that includes a conductor and that is wound helically around a circumference of the magnetic core such that a helical axis of the energizing coil is oriented in the longitudinal direction, the energizing coil being configured to generate an alternating magnetic field that induces a current in the conductive layer in a case where an alternating current is passed through the conductor of the energizing coil,
wherein the conductive layer is configured to generate heat by the current induced in the conductive layer, and
wherein, in a case where a distance between a first cross section of the conductor of the energizing coil in a plane along the longitudinal direction and a second cross section of the conductor of the energizing coil in the plane and adjacent to the first cross section in the longitudinal direction is L1 (mm), and a distance between the conductor of the energizing coil and the magnetic core in a radial direction orthogonal to the helical axis is L2 (mm), following inequalities are satisfied,
L1>0.1 and 0.1<L2<2.0.
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