| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for preventing a protective glass included in a laser processing head from being polluted with fume and a laser processing head.SOLUTION: The antipollution method for a protective glass, which prevents fume from sticking to the protective glass 15 in a laser processing head 1 including a protective glass 15 for protecting a condenser lens 5 in the laser processing head 1 below the condenser lens 5 and gas flow forming means for flowing a protective gas along the undersurface of the protective glass 15, prevents fume from sticking to the protective glass 15 by arranging a fume aperture 41 with a center hole 43 below the protective glass 15 to give restriction to an outflow path for the protective gas, and by rapidly flowing the protective gas out of the center hole 43. |
