Fixing device and image forming apparatus therewith

摘要

In a fixing apparatus for fixing a toner image on a transfer material by applying heat and pressure to the transfer material, the fixing apparatus includes: a roll-shaped rotary member for applying heat, including a ray radiating device for radiating a ray generated by a ray generating source provided inside the ray radiating device; a cylindrical ray-transmitting base member through which the ray generated by the ray generating source is transmitted, being arranged around the ray radiating device; a resilient layer; and a ray absorbing layer provided outside the resilient layer for absorbing the ray generated by the ray generating source. The following condition is satisfied, K1 > K2 where K1 (J/cm.s.K) represents thermal conductivity of the ray-transmitting base member and K2 (J/cm.s.K) represents thermal conductivity of the resilient layer.