Image heating apparatus having a controller for generating magnetic flux in a coil to generate heat
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United States of America Patent
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Jan 17, 2017
Grant Date -
Apr 21, 2016
app pub date -
Oct 20, 2015
filing date -
Oct 21, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
An image heating apparatus for heating an image includes a cylindrical rotatable member including an electroconductive layer; a helical coil provided in the rotatable member, the coil having a helix axis extending along a generatrix direction of the rotatable member; a magnetic core provided in the coil and having an end portion; and a controller configured to control a frequency of an AC current supplied to the coil; wherein the image is heated by heat of the rotatable member heated by electromagnetic induction heat generation of the electroconductive layer, wherein the controller sets the frequency to a first frequency corresponding to a size of a recording material, and wherein the controller sets the frequency to a second frequency higher than the first frequency when a print ratio of the image is larger than a predetermined value.
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