Patent ID: 7062187
Filing Date: 2006-06-13
Classification: G03G

Abstract:
1. A fixing device of an image forming apparatus for thermally fixing a toner image formed on a transfer material, the fixing device comprising: (a) a heating roller having a heating device; and (b) a temperature detector which is spaced away from the heating roller, and which comprises: a surface temperature detecting sensor for detecting a temperature of a surface of the heating roller, a compensation temperature sensor for detecting an ambient temperature of the surface temperature detecting sensor, and a casing having an opening portion at a first position and a portion enclosed by the casing at a second position, wherein the surface temperature detecting sensor is placed at the first position such that the surface temperature detecting sensor is directly exposed to heat radiation of the heating roller through the opening, and the compensation temperature sensor is placed at the second position, wherein the opening portion is disposed so as not to enter a region between a vertical plane containing a central axis of the heating roller and a tangential plane to a circumferential surface of the heating roller parallel to the vertical plane, and wherein a central portion of the surface temperature detecting sensor faces the central axis of the heating roller.