Roller-shaped heater and fusing unit using a roller-shaped heater

摘要

A roller-shaped heater includes: a cylindrically formed roller member; and a heat generator disposed on the inner peripheral surface of the roller member and composed of a heat-resisting insulation material and resistance heating elements formed on the heat-resisting insulation material, and is constructed in such a manner that the heat generator is composed of a multiple number of separated portions extending in the axial direction of the cylinder of the roller member and each portion has the resistance heating element. Alternatively, the roller-shaped heater is constructed in such a manner that the heat generator is formed with a multiple number of resistance heating elements and the multiple number of resistance heating elements are arranged in parallel with each other in the axial direction of the cylinder of the roller member. <IMAGE>