Fixing device and image forming device

Abstract

The present invention provides a fixing device for fixing an image on a recording medium, which includes an endless fixing belt, a pressure roller, a heat source body, and a cover member. The fixing belt is rotatable around the first rotation axis. The pressure roller is rotatable about a second rotation axis parallel to the first rotation axis, and a nip portion that pressurizes and passes the recording medium is formed between the pressure roller and the fixing belt. The heat source body is provided inside the fixing belt, has a long shape extending in a direction substantially parallel to the first rotation axis, and radiates radiant heat to heat the fixing belt. The cover member is provided between the fixing belt and the heat source body, and covers the heat source body. When the area where the recording medium of the clamping part passes is referred to as the passing area, and the area of ​​the clamping part located outside the passing area in the axial direction is referred to as the non-passing area, the cover member covers the heat source body and corresponds to the non-passing area. part. The cover member has a plurality of through holes for adjusting the surface temperature of the heat source body.

Description

technical field [0001] The present invention relates to a fixing device for fixing an image on a recording medium such as paper, and an image forming device such as a copier, a printer, a facsimile machine, and an all-in-one machine provided with the fixing device. Background technique [0002] In recent years, in the field of electrophotographic image forming apparatuses, a belt-type fixing device in which an endless fixing belt is rotated together with a pressure roller has been popularized. Thin material is formed. The belt-type fixing device adopts a low-heat-capacity fixing belt, which can shorten the warm-up time compared with the heat-roller-type fixing device in the prior art. [0003] In the belt-type fixing device, a heat source body such as a halogen heater is provided inside the fixing belt, and the fixing belt is heated by radiant heat emitted from the heat source body. In addition, the axial length of the fixing belt is greater than the maximum width of the p...

AI Technical Summary

Problems solved by technology

That is, when the temperature of the fixing belt is excessively raised in the non-passing area due to the continuous printing operation for a long time, there may be a problem that the temperature of the end portion of the fixing belt located in the non-passing area exceeds the detectable temperature of the temperature sensor. upper limit of the range, making it impossible to accurately detect the temperature of the end of the fixing belt

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