Patent ID: 7013097

Claim:
A fixing apparatus comprising: a first rotatable member having an endless configuration; a second rotatable member in pressure contast with said first rotatable member, said second rotatable member causing a recording an image to be nipped and conveyed at a pressure contact portion between said first and second rotatable members; temperature raising means for raising a temperature of a local portion of said first rotatable member by reception of a supply of electric power; temperature detecting means for detecting a temperature of a location different from said pressure contact portion with respect to a rotational direction of said first rotatable member; first control means for feedback-controlling electric power to be supplied to said temperature raising means based on the temperature detected by said temperature detecting means; setting means for variably setting a set value corresponding to electric power to be supplied to said temperature raising means, based on a temperature rise speed detected by said temperature detecting means when a predetermined amount of electric power is supplied; and second control means for temporally supplying electric power corresponding to the set value set by said setting means to said temperature raising means in timing close to timing in which the temperature detected by said temperature detecting means reaches a target temperature, or timing close to timing in which the recording material rushes in said pressure contact portion when said fixing apparatus is started up, wherein time t of period for which said second control means is operated is represented by t≦(a+L)/V where V is a moving speed of an outer circumference of said first rotatable member, a is a length of said first rotatable member from said pressure contact portion to said temperature detection location, and L is an outer circumferential length of said first rotatable member.