Patent ID: 9658582
Date: 2017-05-23
CPC Classifications: G03G

Claim:
1. A fusing device comprising: a heating element that is rotatable; and a coil module circuit configured to generate a magnetic flux for heating the heating element and comprising a coil module facing an outer circumference surface of the heating element and arranged to be separated from the outer circumference surface of the heating element in a facing direction, and a power supply configured to supply power to the coil module, wherein the coil module comprises: a first coil arranged in a widthwise direction of the heating element; a pair of second coils arranged to overlap in the facing direction both end portions of the first coil in the widthwise direction; and a single third coil arranged to overlap in the facing direction a central portion of the first coil in the widthwise direction, a first end of the third coil being adjacent to one of the pair of second coils, and a second end of the third coil being adjacent to the other of the pair of second coils, and wherein the coil module circuit comprises a switching connection unit configured to switch serial connections of the first coil, the second coils, and the third coil in order to switch current directions of the first coil and the third coil with respect to the second coils, or switch the current direction of the second coils with respect to the first coil and the third coil.