| 主权项 |
1. A laser processing apparatus comprising:
a head main body housing an optical system that a laser beam enters and that condenses the laser beam; and a nozzle that is fastened to the head main body by thread fastening and that applies the laser beam to a workpiece, wherein the nozzle has a nozzle hole through which the laser beam passes, the head main body has an opening that communicates with the nozzle hole, a protection member that closes the opening is disposed between the head main body and the nozzle, a pressure chamber is formed between the head main body and the nozzle, the pressure chamber being a space surrounded by a surface of the head main body, the surface of the head main body intersecting with a fastening direction in which the head main body and the nozzle are fastened together by thread fastening, and a surface of the nozzle, the surface of the nozzle intersecting with the fastening direction, and the pressure chamber being supplied with air or assist gas, and the nozzle has a communication hole that provides communication between the pressure chamber and the nozzle hole. |
