Patent ID: 7263304

Claim:
A fixing apparatus, comprising: a heating member which rotates; a first coil which performs induction heating at a part of the heating member, which is a first area in a direction that intersects at right angles with a direction in which the heating member rotates; a second coil which performs induction heating at a second area of the heating member, which extends in the direction that intersects at right angles with the direction in which the heating member rotates; a first temperature sensor which detects a temperature T 1 of the part of the heating member, which is the first area in the direction that intersects at right angles with the direction in which the heating member rotates; a second temperature sensor which detects a temperature T 2 of the second area of the heating member, which extends in the direction that intersects at right angles with the direction in which the heating member rotates; a signal-processing circuit which generates a signal for allowing each of the coils to operate or inhibiting the same from operating, in accordance with the temperatures detected by the temperature sensors, and which generates a signal for designating operation of the first coil or second coil; a drive circuit which selectively drives each of the coils, in accordance with the signals generated by the signal-processing circuit; a first high-frequency wave generating circuit which outputs a high-frequency current for causing the first coil to generate a high-frequency magnetic field for induction heating; and a second high-freciuency wave generating circuit which outputs a high-frequency current for causing the second coil to generate a high-frequency magnetic field for induction heating.