# US 10,864,600 B2 · Laser machining device

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- Number: US 10,864,600 B2
- Document ID: US10864600B2
- Status: Granted
- Kind: B2
- Application number: 16/347,815
- Filed: 2017-03-21
- Published: 2019-12-05
- Granted: 2020-12-15
- Earliest claimed: 2017-03-21
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Daiji Morita; Tomotaka Katsura; Hiroaki Kurokawa
- Web page: https://patentgrep.com/patent/US10864600B2

## CPC

- B23K 26/0608: {in the same heat affected zone [HAZ] (B23K26/0613, B23K26/0619 take precedence)}
- B23K 26/0613: {having a common axis (B23K26/0619 takes precedence)}
- B23K 26/0643: {comprising mirrors}
- B23K 26/0648: {comprising lenses}
- B23K 26/0665: {by beam condensation on the workpiece, e.g. for focusing}
- B23K 26/067: Dividing the beam into multiple beams, e.g. multi-focusing
- G02B 6/4204: {the coupling comprising intermediate optical elements, e.g. lenses, holograms (encapsulated active devices H01S5/02208)}
- G02B 6/425: {Optical features (semiconductor laser arrays H01S5/40; hybrid LED arrays H10W90/00)}
- G02B 27/1086: {operating by diffraction only}
- H01S 5/141: {using a wavelength selective device, e.g. a grating or etalon (H01S5/146 takes precedence)}
- H01S 5/4012: {Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms}
- H01S 5/4087: {emitting more than one wavelength}
- G02B 6/262: {Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements}
- G02B 6/29367: {Zigzag path within a transparent optical block, e.g. filter deposited on an etalon, glass plate, wedge acting as a stable spacer}
- H01S 5/005: {Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping (H01S5/026, H01S5/18388 take precedence)}
- H01S 5/0071: {for beam steering, e.g. using a mirror outside the cavity to change the beam direction}
- H01S 5/02251: using optical fibres
- H01S 5/02325: Mechanically integrated components on mount members or optical micro-benches
- H01S 5/146: {using a fiber as external cavity}
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL

## Abstract

A laser machining device includes a plurality of oscillators to emit laser beams having different wavelengths from each other; a machining head to emit laser beams emitted from the respective oscillators to a machining object; a plurality of transmission fibers to transmit the laser beams to the machining head; a wavelength dispersion element; and a focusing lens to superpose the laser beams emitted from the transmission fibers, wherein the wavelength dispersion element is arranged at a position at which the laser beams are superposed by the focusing lens.

## Claims

### Claim 1

A laser machining device comprising:
a plurality of oscillators to emit laser beams having different wavelengths from each other;
a machining head to emit laser beams emitted from the respective oscillators to a machining object;
a plurality of fibers to transmit the laser beams to the machining head;
a wavelength dispersion element provided in the machining head; and
an optical element provided in the machining head to superpose laser beams emitted from the fibers on each other, wherein
the wavelength dispersion element is arranged at a position at which laser beams are superposed by the optical element,
a first end of each of the plurality of fibers is connected to a corresponding one of the plurality of oscillators;
a second end of each of the plurality of fibers is arranged along a same plane and in parallel to each other at the machining head; and
the second end of each of the plurality of fibers is spaced apart from each other by an interval there between in the plane;
a machining lens arranged between the wavelength dispersion element and the machining object, the machining lens to focus laser beams output by the wavelength dispersion element at a machining point on the machining object; and
a mirror arranged between the wavelength dispersion element and the machining lens to change a direction of the laser beams output by the wavelength dispersion element.

### Claim 2 (depends on 1)

The laser machining device according to claim 1, wherein the wavelength dispersion element outputs laser beams superposed by the optical element as a beam having one optical axis or as split beams by allowing a diffraction angle of the wavelength dispersion element to be adjusted.

### Claim 3 (depends on 1)

The laser machining device according to claim 1, wherein a wavelength of the laser beams is equal to or shorter than 900 nanometers.

### Claim 4 (depends on 2)

The laser machining device according to claim 2, wherein a wavelength of the laser beams is equal to or shorter than 900 nanometers.

### Claim 5

A laser machining device comprising;
a plurality of oscillators to emit laser beams having different wavelengths from each other;
a machining head to emit laser beams emitted from the respective oscillators to a machining object;
a plurality of fibers to transmit the laser beams to the machining head;
a diffraction grating provided in the machining head; and
a lens provided in the machining head to superpose laser beams emitted from the fibers on each other, wherein
the diffraction grating is arranged at a position at which laser beams are superposed by the lens,
a first end of each of the plurality of fibers is connected to a corresponding one of the plurality of oscillators,
a second end of each of the plurality of fibers is arranged along a same plane and in parallel to each other at the machining head, and
the second end of each of the plurality of fibers is spaced apart from each other by an interval therebetween in the plane;
a machining lens arranged between the diffraction grating and the machining object, the machining lens to focus laser beams output by the diffraction grating at a machining point on the machining object, and
a mirror arranged between the diffraction crating and the machining lens to change a direction of the laser beams output by the diffraction grating.

### Claim 6 (depends on 1)

The laser machining device according to claim 1, further comprising the machining lens arranged in the machining head and between the wavelength dispersion element and the machining object, the machining lens to directly focus laser beams output by the wavelength dispersion element at a machining point on the machining object.