Abstract: A laser scribing installation for the treatment of grain oriented magnetic sheets, as strip in longitudinal movement, comprising a laser generator for a laser beam, a cylindrical telescopic optical group with varying focal distance for the formation of a laser beam with elliptic section having varying ellipticity as function of the focal distances and a rotating mirror scanner for scanning the laser beam according to a pre-defined angle. The scribing installation further comprises a parabolic reflector extended transversally to the strip for receiving the scanned laser beam and focusing the beam on the strip, as a greatly lengthened elliptic spot, along a treatment path, and wherein the telescopic group is adjustable for modifying the length of one of the axes in the elliptic section of the laser beam incident on the strip.

Abstract: A laser scribing installation for the treatment of grain oriented magnetic sheets, as strip in longitudinal movement, comprising a laser generator for a laser beam, a cylindrical telescopic optical group with varying focal distance for the formation of a laser beam with elliptic section having varying ellipticity as function of the focal distances and a rotating mirror scanner for scanning the laser beam according to a pre-defined angle. The scribing installation further comprises a parabolic reflector extended transversally to the strip for receiving the scanned laser beam and focusing the beam on the strip, as a greatly lengthened elliptic spot, along a treatment path, and wherein the telescopic group is adjustable for modifying the length of one of the axes in the elliptic section of the laser beam incident on the strip.