Patent ID: 7865102

Claim:
An image fixing apparatus for fixing an image formed on a recording material, comprising: a rotary member that contacts with a recording material bearing an image; a first heater provided in said rotary member, wherein a heat generation amount per unit length at a central region of said first heater in a longitudinal direction is higher than a heat generation amount per unit length at end regions of said first heater in the longitudinal direction; a second heater provided in said rotary member, wherein a heat generation amount per unit length at end regions of said second heater in a longitudinal direction is higher than a heat generation amount per unit length of said second heater at a central region in the longitudinal direction; a pressure roller that forms a nip portion to pinch and convey the recording material with said rotary member, wherein the image on the recording material is fixed onto the recording material by heating the image at the nip portion; a first temperature detection portion that detects a temperature of said rotary member at a longitudinal central region of said rotary member; a second temperature detection portion that detects a temperature of said rotary member at a longitudinal end region of said rotary member; and a control circuit for controlling electrifying of said first heater and said second heater, wherein, when said apparatus starts warming up, said control circuit controls electrifying of said first heater so that the temperature detected by said first temperature detection portion reaches a first target temperature and controls electrifying of said second heater so that the temperature detected by said second temperature detection portion reaches a second target temperature; and wherein a difference between the first target temperature and the second target temperature in a case where an initial temperature of said rotary member is lower than a predetermined temperature is higher than a difference between the first target temperature and the second target temperature in a case where the initial temperature of said rotary member is higher than the predetermined temperature.