Patent ID: 7890040
Filing Date: 2011-02-15
Classification: G03G

Abstract:
1. A fusing unit which is formed on a printing path of an image forming apparatus and fuses an image to a printing medium, the fusing unit comprising: a heat source; a nip plate which is heated by the heat source, and comprises a nip part to heat and press the printing medium; a reflection member including a heat reflecting surface which is formed on a side of the nip plate and reflects heat generated by the heat source toward the nip part; a belt member which is rotatably provided about the heat source, the nip plate and the reflection member, and guides the movement of the printing medium; and a driving roller, which faces the nip part to form a fusing nip between the nip part and the driving roller corresponding to a width of the nip part, disposed such that the belt member is between the nip plate and the driving roller, and the driving roller rotatably drives the belt member, wherein the heat reflecting surface of the reflection member satisfies a curvature condition according to Formula 1, Formula 1 being φ/2-15°≦θ≦φ/2+15°, where L