Laser processing device with a light gathering member for irradiating the workpiece with a shape other than a one-point like profile, i.e. like a circle or a ring

摘要

The invention relates to a laser processing device comprising a laser oscillator (10) and a light gathering member (20) for gathering a laser beam generated by the laser oscillator (10) and for irradiating the laser beam onto a workpiece (12). The light-gathering member (20) has an optional structure such that the profile of the irradiated area on the workpiece (12) by the laser beam at a geometrical optical focal point (14) is a circle on a ring rotationally symetrical about an optical axis (22) of the laser beam.