| 摘要 |
PURPOSE:To suppress the heat generation and noise of a driving motor for a rotary polygon mirror and to prevent the thermal diffusion of a heat fixation device by enclosing the driving motor with a partition, blowing external air into the formed closed space, and providing the heat fixation device closely to the partition. CONSTITUTION:Copying operation is carried out repeately and the driving motor 5 for the rotary polygon mirror and the heat fixation device 22 rises in ambient temperature, but the space S formed of an optical table 8 and the partition 28 while surrounding the driving motor 5 is ventilated to be cooled by the external air flowing therein through the opening 29 of a front side plate 29. Then, the ambient air of the heat fixation device 22 close to the surface of the partition 28 is also cooled. Consequently, the temperature rise of the driving motor 5 is suppressed to obtain stable operation, and the conduction of heat radiated from the heat fixation device 22 to a photosensitive drum 3 is also suppressed. |
