| 摘要 |
In an image forming apparatus, an original placed on an exposure table is illuminated for exposure to form an image. The image forming apparatus comprises an optical unit including a light source for exposing the original and a ventilating unit for ventilating the optical unit. The ventilating unit is provided with a fan, a first duct for guiding and discharging air from the fan to the outside of the apparatus, and a second duct for guiding part of the air from the fan so as to drive it back into the optical unit.
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