Patent ID: 7136601

Claim:
A fixing apparatus comprising: a first rotary member and a second rotary member, for nipping and conveying a recording material, said first rotary member having a belt-shaped member; a supporting member which slidably supports the first rotary member; a heating element for heating the first rotary member, whereby an image on the recording material nipped and conveyed at said nip portion is heat-fixed; an electric power supplying portion for supplying an electric power to said heating element; a temperature detecting element for detecting a temperature of the first rotary member, said temperature detecting element being out of contact with said supporting member and arranged at a position where a portion of the first rotary member at which is in said nip portion reaches when the first rotary member rotates by a predetermined angle; and a controller for controlling a temperature of said first rotary member by performing feedback control of the electric power supplied from said electric power supplying portion to said heating element on the basis of a temperature detected by said temperature detecting element, wherein said controller increases an amount of the electric power supplied to said heating element substantially at a timing when a temperature change of said nip portion caused by conveying of the recording material into said nip portion will be reduced without depending on a detection of a temperature change caused by conveying of the recording material into said nip portion by said temperature detecting element.