| 摘要 |
PROBLEM TO BE SOLVED: To prevent or alleviate a spatter reach to a condenser lens by an assist gas, when a spatter infiltrates from an irradiation port provided in a processing head body.SOLUTION: In a laser processing head which irradiates a work piece with a laser beam 4 condensed by a condenser lens 2 installed in an upper part of a processing head body 1, as well as with an assist gas from an irradiation port 3 provided in a lower part, a side face of the processing head body 1 is provided with an assist gas jet member 5 between the condenser lens 2 and the irradiation port 3. The assist gas jet member 5 jets the assist gas in a direction which traverses the optical axis 4a of the laser beam 4 and is inclined to the downstream side in the irradiation direction. A jet port 6 is formed at a tip of the assist gas jet member 5, and an opening area of the jet port 6 is smaller than that of the irradiation port 3. |
