Method and device for the separation of flat workpieces made from a brittle material

(57) By the method of the summary former, the laser beam equipped with the line beam profile and the cold spot to follow since heat mechanical stress was increased is moved along the separation line of predetermined form. In order to make all the form separable (free form cutting) according to the present invention, The line focus is created on a workpiece by this laser beam, the flattery data of a separation line (2) is made at the time of each scanning motion, and when this adjusts scanning amplitude, the method by which the curvature corresponding to the outline of the form of a separation line is given to this line focus is enforced.