Patent ID: 8497451

Claim:
A method for making a brittle non-metallic workpiece, comprising: providing a laser cutting device, the laser cutting device having a laser source, a lens, a worktable, and a controller, the lens configured for focusing a laser beam emitting from the laser source, the controller being configured for controlling a movement of the lens and worktable; positioning a brittle non-metallic substrate on the worktable, focusing the laser beam on the brittle non-metallic substrate by the lens, and forming an elliptic beam spot; moving the laser cutting device in such way that the center of the major axis of the elliptic beam spot intersects along the predetermined cutting path and the major axis is substantially tangent to the predetermined cutting path at the intersecting point, wherein the controller drives the worktable to move along the predetermined cutting path according to a first program, and drives the lens only to rotate about the optical axis thereof according to a second program at the same time to make the major axis substantially tangent to the predetermined cutting path at the intersecting point; applying a coolant stream following the elliptic beam spot to move, thus forming a crack in the brittle non-metallic substrate corresponding to the predetermined cutting path; and separating the brittle non-metallic substrate along the crack.