Patent ID: 9520693
Filing Date: 2016-12-13
CPC Classification: B23K,G02B,H01S

Claim Text:
1. A laser processing machine comprising: a plurality of collimating lenses which convert a laser beam from a laser oscillator into parallel rays of light, the laser beam emerging from a point of emergence of a transmission optical fiber, the plurality of collimating lenses being spaced from each other in an orthogonal direction perpendicular to an optical axis; a condensing lens operable to collect the laser beam, which has been converted into the parallel rays of light, and then to radiate the collected laser beam onto a work to be processed; a nozzle positioned on one side of the work adjacent the condensing lens and operable to discharge an assist gas, a distance from the point of emergence to a tip of the nozzle being unchangeable; and a switching device which switches a position of the plurality of collimating lenses in the orthogonal direction so that an arbitrarily chosen one of the plurality of the collimating lenses may have a lens center thereof coinciding with the center of the laser beam emitted from the point of emergence, wherein the plurality of the collimating lenses have respective focal lengths that are different from each other.