| 摘要 |
The invention provides a laser beam machine having a light path duct with improved dust proof property. A light path system of a laser beam machine comprises a light path duct 10 having a U-shaped cross-section with the upper end opened, and a light path 12 into which clean air is fed. Gutters 110 are disposed on both sides of the light path duct 10 , and liquid 120 is filled therein. The laser beam extraction unit 50 traveling on the light path duct 10 has panels 150 disposed on both sides thereof, and a skirt portion 152 formed at the end of each panel 150 is immersed in the liquid 120 , thereby forming a liquid seal.
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