| 摘要 |
A fixing device includes: a laser radiating section for radiating laser light to a sheet so that a toner image on the sheet is fixed to the sheet, an optical sensor, and a smoke detecting section. The optical sensor includes a light radiating section for radiating light with a predetermined wavelength and a light receiving section for receiving the light with a predetermined wavelength so as to output a signal corresponding to a received amount of the light with a predetermined wavelength. The light radiating section and the light receiving section are positioned in such a manner that the light radiating section and the light receiving section face each other with a light path of the laser light therebetween, and light radiated from the light radiating section crosses the light path of the laser light and then reaches the light receiving section. The smoke detecting section detects smoke in the fixing device based on the signal. Thus, the laser fixing device can detect smoke with high accuracy.
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