# US 11,440,135 B2 · Laser machining nozzle for a laser machining device, and laser machining device

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- Number: US 11,440,135 B2
- Document ID: US11440135B2
- Status: Granted
- Kind: B2
- Application number: 16/171,871
- Filed: 2018-10-26
- Published: 2019-02-28
- Granted: 2022-09-13
- Earliest claimed: 2013-05-23
- Assignees: TRUMPF Werkzeugmaschinen GmbH + Co. KG
- Applicants: TRUMPF Werkzeugmaschinen GmbH + Co. KG
- Inventors: David Schindhelm; Christian Greger; Boris Regaard
- Web page: https://patentgrep.com/patent/US11440135B2

## CPC

- B23K 26/032: {using optical means}
- B23K 26/1462: {Nozzles; Features related to nozzles}
- B23K 26/1476: {Features inside the nozzle for feeding the fluid stream through the nozzle}
- 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

## Abstract

Described is laser machining nozzles for laser machining devices. The laser machining nozzles includes a body having an inner surface and an outer surface. The inner surface of the laser machining nozzles include at least one subarea. The subarea includes a layer of at least one of the copper oxides CuO and Cu2O. The layer of CuO and/or Cu2O has an absorbing effect for radiation at an observation wavelength between 300 and 1100 nm or between 900 and 1700 nm.

## Claims

### Claim 1

A laser machining nozzle for a laser machining device, the laser machining nozzle comprising a body comprising an inner surface and an outer surface,
wherein the inner surface of the laser machining nozzle comprises at least one contrast section that is directly formed on the inner surface,
wherein the contrast section directly adjoins a nozzle opening of the laser machining nozzle facing a workpiece, and
wherein the contrast section comprises a scattering surface structure that has a surface roughness that provides a scattering effect for radiation at an observation wavelength between 300 and 3000 nm.

### Claim 2 (depends on 1)

The laser machining nozzle of claim 1, wherein the body comprises copper.

### Claim 3 (depends on 1)

The laser machining nozzle of claim 1, wherein the body is a one-piece component.

### Claim 4 (depends on 1)

The laser machining nozzle of claim 1, wherein the contrast section surrounds a nozzle opening of the laser machining nozzle.

### Claim 5 (depends on 1)

The laser machining nozzle of claim 1, wherein the inner surface area of the nozzle outside the contrast section comprises a smooth metallic surface.

### Claim 6 (depends on 1)

The laser machining nozzle of claim 1, wherein the observation wavelength is between 300 and 1100 nm.

### Claim 7 (depends on 1)

The laser machining nozzle of claim 1, wherein the observation wavelength is between 900 and 1700 nm.

### Claim 8 (depends on 1)

The laser machining nozzle of claim 1, wherein a level of roughness of the scattering surface structure corresponds to at least an order of magnitude of the observation wavelength.