Image heating apparatus
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United States of America Patent
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Nov 3, 2015
Grant Date -
Jun 18, 2015
app pub date -
Dec 12, 2014
filing date -
Dec 18, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
An image heating apparatus, which is configured to heat an image formed on a recording material, includes a cylindrical rotatable member including a conductive layer, and a coil including a helically shaped portion helically wound along a generatrix direction of the rotatable member inside the rotatable member. The coil is configured to produce an alternating magnetic field for causing the conductive layer to generate heat by electromagnetic induction. The image heating apparatus further includes a magnetic core disposed in the helically shaped portion. The magnetic core includes a plurality of divided cores into which the magnetic core is divided in the generatrix direction. The number of turns of the coil per unit length at a region that corresponds to a boundary between the divided cores is larger than the number of turns of the coil at a region that does not correspond to the boundary.
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