EP 1146986 A1 20011024 - A METHOD AND AN APPARATUS FOR CHECKING THE CONDITION OF A PROTECTIVE GLASS IN CONNECTION WITH LASER MACHINING
Title (en)
A METHOD AND AN APPARATUS FOR CHECKING THE CONDITION OF A PROTECTIVE GLASS IN CONNECTION WITH LASER MACHINING
Title (de)
VERFAHREN UND VORRICHTUNG ZUM PRÜFEN DES ZUSTANDS EINES SCHUTZGLASES IN VERBINDUNG MIT LASERBEARBEITUNG
Title (fr)
PROCEDE ET APPAREIL DE VERIFICATION DE L'ETAT D'UN VERRE PROTECTEUR EN RELATION AVEC UN USINAGE LASER
Publication
Application
Priority
- SE 9900592 W 19990413
- SE 9801780 A 19980520
Abstract (en)
[origin: WO9959762A1] The invention relates to a method and an apparatus for checking the condition with respect to dirt contamination in the form of small smoke particles accumulated on a protective glass plate (3) arranged between the workpiece (2) and the laser optics (1) in a laser machining system and through which protective glass plate the machining laser beam (6) is arranged to pass. A thermal detector (10) is arranged, with a good thermal contact with the mechanical part attaching the protective glass plate in a holder (4), for sensing (measuring) the temperature of said mechanical attachment part. Due to an absorption of the laser beam by the small smoke particles an increased temperature is obtained on the protective glass plate and the mechanical parts that are attaching the protective glass in its holder (4). As soon as the detector signal has reached a certain level it can be indicated that it is time to replace the protective glass plate. The thermal detector (10) is preferably combined with an optical detector (8) sensing the radiation scattered by larger dirt particles collected on the protective glass plate during the machining process.
IPC 1-7
IPC 8 full level
B23K 26/00 (2014.01); B23K 26/064 (2014.01); H01S 3/02 (2006.01)
CPC (source: EP)
B23K 26/702 (2015.10); B23K 26/707 (2015.10)
Designated contracting state (EPC)
AT BE CH CY DE DK ES LI
DOCDB simple family (publication)
WO 9959762 A1 19991125; EP 1146986 A1 20011024; JP 2002515341 A 20020528; SE 512097 C2 20000124; SE 9801780 D0 19980520; SE 9801780 L 19991121
DOCDB simple family (application)
SE 9900592 W 19990413; EP 99925508 A 19990413; JP 2000549415 A 19990413; SE 9801780 A 19980520