Patent ID: 8611803

Claim:
A fusing device comprising: a fusing belt formed as a closed loop; a magnetic flux generator disposed outside the fusing belt to emit magnetic flux for induction heating of the fusing belt; a first fusing roller and a second fusing roller that are disposed in parallel with each other inside the fusing belt and support the fusing belt; a nip guide located between the first fusing roller and the second fusing roller; and a compressing roller disposed on an outer portion of the fusing belt for compressing against the first and second fusing rollers and the nip guide to form nips on portions of the fusing belt, wherein the magnetic flux generator includes— a coil wound along a length direction of the first and second fusing rollers, a magnetic core disposed to face the fusing belt while the coil is disposed between the magnetic core and the fusing belt to guide magnetic flux generated by the coil, and a bobbin supporting the coil and the magnetic core, wherein the magnetic core includes— a main core including a plurality of core pieces that are arranged in the length direction of the first and second fusing rollers, and two end cores extending in the length direction of the first and second fusing rollers and contacting ends of the plurality of core pieces, and wherein core pieces located at ends among the plurality of core pieces have a core body having an arch-shaped cross-section and a center core having a first side contacting a center portion of the core body and a second side located inside the coil.