| 摘要 |
An optical scanning unit of an image forming apparatus is provided to prevent foreign substances from entering the housing by shutting off a window in no optical scanning. An optical scanning unit of an image forming apparatus includes a beam source, a polygon mirror(150), a housing(111), a shutter(191), and a shutter driving unit(192). The beam source generates beams. The polygon mirror deflects the beams from the beam source within a certain angle range. The housing includes a window for outputting the beams reflected through the polygon mirror. The shutter controls the closing and opening of the window. The shutter driving unit drives the shutter.
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