US 12,134,139 B2
Device for a laser working system, laser working system having same, and method for setting a focal position of an optical element
Marc Thiel, Baden-Baden (DE); and Benjamin Lassoued, Karlsruhe (DE)
Assigned to Precitec GmbH & Co. KG, Gaggenau (DE)
Appl. No. 16/754,674
Filed by Precitec GmbH & Co. KG, Gaggenau (DE)
PCT Filed Oct. 2, 2018, PCT No. PCT/EP2018/076811
§ 371(c)(1), (2) Date Apr. 8, 2020,
PCT Pub. No. WO2019/072642, PCT Pub. Date Apr. 18, 2019.
Claims priority of application No. 102017009472.1 (DE), filed on Oct. 12, 2017.
Prior Publication US 2020/0353561 A1, Nov. 12, 2020
Int. Cl. B23K 26/046 (2014.01); B23K 26/06 (2014.01); B23K 26/064 (2014.01); B23K 26/70 (2014.01); G01K 1/02 (2021.01); G01K 7/02 (2021.01); G02B 7/02 (2021.01); G02B 7/04 (2021.01); G02F 1/29 (2006.01); H05B 1/02 (2006.01); H05B 3/16 (2006.01); H05B 3/84 (2006.01)
CPC B23K 26/046 (2013.01) [B23K 26/064 (2015.10); B23K 26/0648 (2013.01); B23K 26/707 (2015.10); G01K 1/026 (2013.01); G01K 7/02 (2013.01); G02B 7/028 (2013.01); G02B 7/04 (2013.01); G02F 1/29 (2013.01); H05B 1/023 (2013.01); H05B 3/16 (2013.01); H05B 3/84 (2013.01); H05B 2203/002 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A laser machining head, comprising:
a housing;
an optical element arranged in a beam path of said laser machine head; and
a temperature detector arrangement arranged in the housing inclined with respect to the beam path and having a thermopile matrix positioned at a distance from the optical element and configured to measure a spatially resolved two-dimensional temperature distribution of an entire surface of said optical element, wherein the matrix is at least a 2×2 matrix and wherein an opening angle of the temperature detector arrangement is at least 60°×60°,
the spatially resolved two-dimensional temperature distribution including at least four spatially separated temperature measurement points, at least one of which being in a center of the optical element.