Fixing apparatus that controls current for driving an induction heater
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United States of America Patent
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Nov 22, 2016
Issued Date -
N/A
app pub date -
Oct 29, 2015
filing date -
Nov 27, 2014
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A fixing apparatus includes a belt including a ferromagnetic layer, a roller facing the belt, a ferromagnetic plate disposed inside the belt and having a Curie point that is lower than a Curie point of the ferromagnetic layer, an induction heater configured to cause heat generation in the magnetic layer and the ferromagnetic plate, a driving circuit configured to output a high frequency current to the induction heater by switching on and off switching elements thereof, and a controller. The controller is configured to determine whether or not a temperature of the ferromagnetic plate is higher than the Curie point thereof, and control the driving circuit to reduce a level of the high frequency current when the temperature of the ferromagnetic plate is determined to be higher than the Curie point thereof.
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