Patent ID: 6615003
Filing Date: 2003-09-02
Classification: G03G,H05B

Abstract:
An image forming apparatus including a fixing unit that fixes a developer image onto a recording medium by utilization of heat generation by a heating roller, said image forming apparatus comprising:a sensing section that senses a temperature of the heating roller; an output section that outputs a driving signal based on the temperature sensed by the sensing section; an environmental temperature sensing section that senses an environmental temperature at an installation site of said apparatus; and an induction heating device including: a coil that is received inside the heating roller; a high-frequency generation circuit that supplies a high-frequency current to the coil; a control element that outputs a control signal to the high-frequency generation circuit based on the driving signal output from the output section and that monitors a successive output time of the driving signal from the output section at different points of time corresponding to different temperatures sensed by the environmental temperature sensing section; and processing means for supplying the high-frequency current provided by the high-frequency generation circuit to the coil based on the control signal from the control element, said induction heating device producing an eddy current in the heating roller by causing the coil to generate a high-frequency magnetic field, and causing the heating roller to generate heat based on the eddy current.