US 12,218,482 B2
Laser beam generation device and laser processing apparatus including the same
Yoshimichi Saito, Tokyo (JP); Shuji Wakaiki, Tokyo (JP); Hiroshi Ikarashi, Tokyo (JP); Shingo Tsuda, Tokyo (JP); Hideyasu Machii, Tokyo (JP); and Masato Matsubara, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/604,766
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed May 25, 2020, PCT No. PCT/JP2020/020607
§ 371(c)(1), (2) Date Oct. 19, 2021,
PCT Pub. No. WO2020/241592, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 2019-099470 (JP), filed on May 28, 2019.
Prior Publication US 2022/0200236 A1, Jun. 23, 2022
Int. Cl. H01S 5/068 (2006.01); B23K 26/00 (2014.01); H01S 5/042 (2006.01); H01S 5/40 (2006.01)
CPC H01S 5/06808 (2013.01) [H01S 5/0427 (2013.01); H01S 5/4012 (2013.01); B23K 26/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A laser beam generation device comprising:
a plurality of power supply units each to output a current, the plurality of power supply units being driven by a plurality of control signals, respectively;
a plurality of current detectors provided corresponding to the plurality of power supply units, respectively, and provided each to detect a current output from the corresponding power supply unit;
a plurality of laser diode modules provided corresponding to the plurality of power supply units, respectively, and provided each to receive a current from the corresponding power supply unit and output a laser beam;
a condensing unit to collect a plurality of laser beams output from the plurality of laser diode modules, and output a laser beam; and
a control device to generate the plurality of control signals wherein
a current output from each of the plurality of power supply units includes a current ripple that changes in synchronization with a control signal that drives the corresponding power supply unit, and
the control device changes a phase or a frequency of each of the plurality of control signals based on a magnitude of the current ripple included in the current detected by each of the plurality of current detectors.