Device for machining a workpiece by means of parallel laser beams

The invention relates to a device (1) for machining a workpiece (2) by means of a number of at least approximately parallel laser beams (3', 3', 4', 4'), which form an outer, first pair of laser beams (3) and an inner, second pair of laser beams (4). The laser beams (3', 3') of the outer, first pair of laser beams (3) are deflected precisely three times and the laser beams (4', 4') of the inner, second pair of laser beams (4) are deflected precisely once at a number of reflection surfaces (8', 8', 9', 9', 10', 10', 11', 11', 12', 12'). This reflection ratio of 3:1 has the effect that the spacing (a', a') of all the laser beams (3', 3', 4', 4') from the respectively adjacent laser beam (3', 3', 4', 4') remains constant, irrespective of the absolute position, which can be set as desired. To avoid shifting of the focusing plane (6), the focusing optics (5) respectively assigned to the laser beams (3', 3', 4', 4') are in this case jointly movable together with the reflection surfaces (10', 10', 11', 11', 12', 12'