| 摘要 |
There is provided a cooling system of a projection system including: a division plate dividing an inside space of the projection system into a light projecting space and an optical engine housing space; a first fan sucking air of the light projecting space into the optical engine housing space; a composition unit passing air before sucking the air to the first fan; and a second fan discharging air discharged from at least first fan to the outside. Therefore, the cooling of the projection system is smoothly performed and injection of foreign substance and deterioration of image quality are prevented.
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