Method and device for cutting flat work pieces made of a brittle material

摘要

The apparatus for cutting a flat glass work piece along a curved dividing line includes a laser generating a laser beam having a linear beam profile and an optical system with a scanner for producing a curvilinear focal point from the laser beam. The apparatus also moves a cold spot along the curved dividing line following the curvilinear focal point. A trajectory control device controls the position of the curvilinear focal point on the curved dividing line via actuators. A profile control device controls the contour of the curvilinear focal point according to trajectory data from the curved dividing line, so that all points of the curvilinear focal point lie on or coincide with the curved dividing line. The apparatus adjusts the length of the curvilinear focal point by adjusting scanning amplitude of the scanning motion.