FIXING DEVICE AND IMAGE FORMING APPARATUS

摘要

A fixing device includes a heating body heated by a heat source, a pressuring body, a conversion temperature detecting part, a substrate temperature detecting part, a lens temperature detecting part, a conversion temperature correcting part and a controller. The conversion temperature detecting part has an infrared ray detecting element mounted to a substrate detecting an infrared ray from the heating body and a lens optically focusing the infrared ray onto the infrared ray detecting element. The conversion temperature detecting part detects conversion temperature of surface temperature of the heating body with detection result of the infrared ray detecting element. The substrate temperature detecting part detects substrate temperature. The lens temperature detecting part detects lens temperature. The conversion temperature correcting part corrects the conversion temperature with the substrate temperature and the lens temperature. The controller controls the heat source so that the conversion temperature becomes predetermined fixing control temperature.

主权项

1. A fixing device comprising:
a heating body, of which a surface is heated by a heat source; a pressuring body brought into pressure contact with the heating body to form a fixing nip; a conversion temperature detecting part arranged with respect to the heating body in a noncontact manner, provided with an infrared ray detecting element detecting an infrared ray radiated from the surface of the heating body, a substrate to which the infrared ray detecting element is mounted and a lens optically focusing the infrared ray onto the infrared ray detecting element and configured to detect conversion temperature corresponding to surface temperature of the heating body on the basis of a detection result of the infrared ray detecting element; a substrate temperature detecting part detecting substrate temperature value of the substrate; a lens temperature detecting part detecting lens temperature value of the lens; a conversion temperature correcting part correcting the conversion temperature on the basis of the substrate temperature value and the lens temperature value; and a controller configured to control the heat source so that the conversion temperature becomes predetermined fixing control temperature.