Patent ID: 8509643
Filing Date: 2013-08-13
Classification: G03G

Abstract:
1. A fixing apparatus, comprising: a heating roller having a center part and a peripheral part; a first heater included in the heating roller, heating the center part of the heating roller; a second heater included in the heating roller, heating the peripheral part of the heating roller; a fixing roller; a fixing belt heated by the heating roller, wound around the heating roller and the fixing roller, and circulating between the heating roller and the fixing roller; a pressing roller pressing the fixing roller through the fixing belt; a first non-contact sensor spaced from the fixing belt, detecting a temperature of a first surface area of the fixing belt, the first surface area corresponding to the center part of the heating roller; a second non-contact sensor spaced from the fixing belt, detecting a temperature of a second surface area of the fixing belt, the second surface area corresponding to the peripheral part of the heating roller; and a temperature control unit configured to: control a temperature of the heating by an on/off control of the first heater and the second heater based on a first temperature detected by the first non-contact sensor and a second temperature detected by the second non-contact sensor, the temperature control unit performing the on/off control in which when one of the first heater and the second heater is turned on, the other is off, and to further control the temperature of the heating such that a sum of an on and an off time of at least one of the first or second heater is set to a first repetition period when a speed of the fixing belt is set to a first speed, and the sum of the on and off time is set to a second repetition period shorter than the first repetition period when the speed of the fixing belt is set to a second speed lower than the first speed.