US 12,151,305 B2
Laser beam machine and method for controlling laser beam machine
Tomohiro Kyoto, Tokyo (JP); Masato Kawasaki, Tokyo (JP); Hiroshi Kikuchi, Tokyo (JP); and Kyohei Ishikawa, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 18/691,044
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed May 27, 2022, PCT No. PCT/JP2022/021699
§ 371(c)(1), (2) Date Mar. 12, 2024,
PCT Pub. No. WO2023/228397, PCT Pub. Date Nov. 30, 2023.
Prior Publication US 2024/0261892 A1, Aug. 8, 2024
Int. Cl. B23K 26/06 (2014.01)
CPC B23K 26/06 (2013.01) 17 Claims
OG exemplary drawing
 
1. A laser beam machine comprising:
a laser oscillator configured to output laser light;
a transmission fiber through which the laser light output from the laser oscillator propagates;
a first adjuster configured to adjust an emission numerical aperture of the laser light emitted from an emission end of the transmission fiber by changing an incidence numerical aperture of the laser light incident to an incidence end of the transmission fiber, the first adjuster being disposed between the laser oscillator and the incidence end of the transmission fiber, the first adjuster including a plurality of lenses that are each movable into a position on an optical axis and into a position deviated from the optical axis;
a second adjuster configured to converge the laser light and change a zoom magnification of the laser light between an emission end of the transmission fiber and a workpiece; and
a controller configured to:
adjust a beam diameter of the laser light at an image forming position of the laser light by controlling the second adjuster; and
adjust a beam diameter change amount that is a change amount of the beam diameter with respect to a distance from the image forming position independently of adjustment of the beam diameter, by adjusting the emission numerical aperture by controlling the first adjuster.