Patent ID: 7504605
Filing Date: 2009-03-17
Classification: G03G

Abstract:
1. An image heating apparatus for heating an image formed on a recording material, comprising: a rotary member which does not have any heat source in either itself or an inside area of said rotary member; an opposing member for forming a nip portion in cooperation with said rotary member; a heater which heats said rotary member from an outside of said rotary member; a temperature detecting element for detecting a temperature of said heater; and a controller for controlling an electrical power supply to said heater so as to maintain the temperature detected by said temperature detecting element at a target temperature, wherein said rotary member heats the recording material being pinched and conveyed with the nip portion, and wherein said controller changes a surface temperature of said rotary member from a first target temperature to a second target temperature higher than the first target temperature after a time L/V has passed from a time when a leading edge of the recording material comes into the nip portion, wherein L is a distance from an area in which the nip portion on a surface of said rotary member is formed to an area to which said heater on a surface of said rotary member opposed, and V is a moving speed of a surface of said rotary member.