Patent ID: 6405013
Filing Date: 2002-06-11
Classification: G03G

Abstract:
A fixing apparatus for fixing a toner image on a transfer material by applying heat and pressure onto the transfer material by a roll-shaped rotary member for applying heat, the roll-shaped rotary member comprising:(a) a ray radiating device for radiating heat rays; (b) a cylindrical ray-transmitting base member having transmittance for the heat rays, and having the ray radiating device inside thereof; and (c) a cylindrical ray-transmitting elastic layer or ray-transmitting heat insulating layer having transmittance for the heat rays, wherein the roll-shaped rotary member has a heat ray absorbing layer provided outside the ray-transmitting elastic layer or the ray-transmitting heat insulating layer for absorbing the heat rays, wherein a difference between a heat ray absorbing ratio (%) per unit thickness (mm) in the ray-transmitting base member and that in either the ray-transmitting elastic layer or the ray-transmitting heat insulating layer is made not more than 20%, and wherein a fluctuation of thickness of the ray-transmitting base member and a fluctuation of thickness of either the ray-transmitting elastic layer or the ray-transmitting heat insulating layer are not less than 0.1 mm.