| 摘要 |
PROBLEM TO BE SOLVED: To obtain the device with high cooling effect by deflecting the cooling air from a blowing air cooling means which cools the inside of a main body by a deflecting means provided on the top surface of a scanning optical system. SOLUTION: Fins 71 are a plurality of deflecting means provided on the top surface of a 2nd mirror base of a 2nd scanning part and arranged to have larger angles to the scanning direction shown by an arrow (A) outwardly from the center area. Therefore, when the 2nd mirror is at its home position, the cooling air from cooling fans 61a and 61b as the blowing air cooling means flows along the fins 71, the cooling air having passed by the fins 71 at the center part flows straight in the scanning direction, and the cooling air having passed by the fins 71 on both the end flows by being deflected spreading in the scanning direction. Consequently, the air volume at the end areas C and D, where the cooling air is hard to flow, increases to make the cooling air uniform, thereby improving the cooling effect. |
