| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an optical system for laser beam emission which radiates a laser beam from an inner peripheral face with respect to a work to be machined having a pipe-like shape and the converged spot of the beam is movable in the peripheral direction. SOLUTION: A main rotating part 13 is rotatably fitted on a base part 12 on which an optical fiber 11 is fixed. A front end rotating part 14 is rotatably fitted on the front end of the main rotating part. The main rotating part is provided with an attaching part 19 which is fixed on the rotor of a hollow motor 18 of the base part 12, a lens cell 20 fixed on the attaching part, and a nozzle 21 which emits a laser beam from the lens cell 20 through an opening 29 formed on the outer peripheral part of the nozzle. The front end rotating part and the front end of the nozzle are inserted into a work 35, the front end rotating part is fixed on the work and the main rotating part is rotated then a converged beam spot formed on the inner peripheral face of the work is movable in the peripheral direction.</p> |
