Image heating apparatus heating a toner image on a sheet by the magnetic flux from an excitation coil and controlling the electric power supply to the coil
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United States of America Patent
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Dec 10, 2013
Grant Date -
Apr 25, 2013
app pub date -
Dec 12, 2012
filing date -
Oct 22, 2004
priority date (Note) -
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Abstract
An image heating apparatus includes a coil for generating a magnetic flux by a current flowing therethrough; an image heating member having an electroconductive layer in which an eddy current is produced by the magnetic flux by which heat is generated, the image heating member being effective to heat an image on a recording material; an electroconductive magnetic flux adjusting member movable from a first position and a second position to decrease the eddy current produced in the image heating member by the magnetic flux; a temperature sensor for sensing a temperature of image heating member; electric power control means for control electric power supplied to the coil on the basis of an output of the temperature sensor, wherein the electric power control means changes an electric power condition to be supplied to the coil before start of the movement from the first position to the second position of magnetic flux adjusting member.
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