Patent ID: 7215454

Claim:
An apparatus for substrate treatment by means of laser radiation comprising a rotating polygonal mirror by which at least one laser beam incident as a continuous laser light is reflected and is swept over an arrangement of converging lenses which lie next to one another and which are arranged at a spacing corresponding precisely or approximately to their focal lengths from the moved substrate, which is in particular formed by a material web, wherein the incident laser beam is focused onto the rotating polygonal mirror and the reflected laser light is first collimated again subsequent to the rotating polygonal mirror, wherein the rotating polygonal mirror is divided into at least two regions of the same diameter having a different number of facets; and wherein the rotating polygonal mirror is adjustable such that different regions are introducible into the beam path of the laser radiation and accordingly result in different sweep angles or fan angles of the laser beam reflected by the rotating polygonal mirror, the laser beam corresponding to a perforation track on the substrate.