Patent ID: 6968137
Filing Date: 2005-11-22
Classification: G03G

Abstract:
1. An image heating device comprising: a movable heating member for directly heating a material to be heated; heat-generating means for directly or indirectly heating the heating member; pressing means arranged in contact with the heating member; a temperature sensor for detecting a temperature of the heating member; and controlling means for controlling an amount of heat generated by the heat-generating means according to the temperature of the heating member detected by the temperature sensor so that the heating member has a set temperature, wherein the controlling means estimates a temperature of the pressing means according to at least one of the detected temperature of the heating member and a variation with time in the detected temperature after the heating of the heating member by the heat-generating means is stopped, so as to determine the set temperature for the heating member in a subsequent image heating period, in the case where the detected temperature of the heating member is not lower than a predetermined temperature, the controlling means determines the set temperature for the heating member in the subsequent image heating period according to a variation with time in the detected temperature of the heating member, and in the case where the detected temperature of the heating member is lower than the predetermined temperature, the controlling means determines the set temperature for the heating member in the subsequent image heating period according to the detected temperature of the heating member.