US 11,731,212 B2
Optical unit for laser machining of a workpiece and laser machining device
Simon Scheidiger, Langenthal (CH); Martin Mumenthaler, Rohrbach (CH); and Andreas Luedi, Burgdorf (CH)
Assigned to BYSTRONIC LASER AG, Niederönz (CH)
Appl. No. 17/787,294
Filed by Bystronic Laser AG, Niederönz (CH)
PCT Filed Dec. 22, 2020, PCT No. PCT/EP2020/087640
§ 371(c)(1), (2) Date Jun. 18, 2022,
PCT Pub. No. WO2021/130230, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 19219258.1 (EP), filed on Dec. 23, 2019.
Prior Publication US 2023/0013251 A1, Jan. 19, 2023
Int. Cl. B23K 26/06 (2014.01); B23K 26/36 (2014.01)
CPC B23K 26/0648 (2013.01) [B23K 26/36 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An optical unit for at least one of a laser beam and a high-power laser beam for laser machining of a workpiece, the optical unit comprising:
an optical element configured to optically image the laser beam, and
two protective glasses transparent to the laser beam, the two protective glasses comprising outer edges of which protective glasses are enclosed in an airtight manner by a holder such that with the holder they form an interior space, and
wherein the optical element is arranged in the interior space;
wherein the optical element comprises or is formed from at least one material selected from quartz glass and calcium fluoride; and
wherein the protective glasses comprises or are formed from at least one material selected from sapphire and zinc sulfide.