Fixing apparatus

A fixing apparatus for fixing an image on a record sheet, comprising:

• a tubular fixing roller;
• a pressing roller urged against said fixing roller;
• a heater received in said fixing roller for heating said fixing roller;
• at least one heat pipe embedded in a core of said pressing roller so as to extend in a longitudinal direction of said pressing roller for improving a thermal conductivity, at least a portion of said heat pipe being in an elastic layer of said pressing roller, and
• temperature detection/control means for detecting a temperature of said fixing roller and controlling said heater so as to adjust said temperature of said fixing roller based on said detected temperature;
• `said fixing roller having an imaging portion at a center thereof and having non-imaging portions at both ends thereof, and said heat pipe being disposed in said pressing roller so as to extend through said imaging portion and said non-imaging portions, said temperature detection/control means comprising temperature detection means for detecting said temperature of said fixing roller at said non-imaging portion, said temperature detection/control means comprising temperature regulating means for interrupting electricity to said heater when said fixing roller exceeds a predetermined temperature, said temperature detecting means and said temperature regulating means being in contact with said fixing roller at different positions which are offset in the longitudinal direction of said fixing roller.