| 摘要 |
A laser processing machine includes a plurality of collimating lenses (7) to convert a laser beam (LB) from a laser oscillator, which have been emerged from a point of emergence (P) of a transmission optical fiber (5), into parallel rays of light, a condensing lens (8) to condense the laser beam (LB) and then radiate it onto a work (W), and a nozzle (9) positioned on one side of the work (W) remote from the condensing lens (8). The distance from the point of emergence (P) to the tip of the nozzle (9) remains unchangeable. The collimating lenses (7) are disposed being spaced from each other in a direction parallel to an optical axis. A switching device (10) switches the position of each of the collimating lenses (7) in the orthogonal direction so that the center of one of the collimating lenses (7) may be aligned with a center (O) of the laser beam (LB). The collimating lenses (7) have respective focal lengths that are different from each other. |
