| 摘要 |
PROBLEM TO BE SOLVED: To improve changeability of a protective glass of a light condensing lens built in a laser processing head. SOLUTION: This laser processing head 1 has a light condensing lens 20 inside a cylindrical lens holder 10, condenses laser beams LB, ejects the laser beam from an opening part 14 of a nozzle part 12 installed at the tip of the lens holder 10, and focuses on a processing part W1 of a workpiece 70. A protective glass 40 is fit to the lens holder 10 via a glass holder 30 on a nozzle part 12 side of the light condensing lens 20. The protective glass 40 has a shape obtained by dividing a disc-like protective lens at a joint face 40a into two pieces, each of which is supported by the half-arc shaped glass holder 30. The glass holder 30 is slidably mounted to a slit 11 of the lens holder 10, and pulls out the glass holder 30 so as to change the protective glass 40. |
