Patent ID: 8720228
Filing Date: 2014-05-13
Classification: C03B,Y02P

Abstract:
1. A method of separating a strengthened glass substrate comprising a compressive surface layer and an inner tension layer, the method comprising: forming an initiation defect through the compressive surface layer to partially expose the inner tension layer, the initiation defect being offset from the first edge of the strengthened glass substrate and perpendicular to a scribing direction on the line of desired separation; translating a laser beam on a surface of the strengthened glass substrate along a line of desired separation from a first edge of the strengthened glass substrate toward a second edge of the strengthened glass substrate in a single pass of the laser beam such that a controlled full-body crack propagates from the second edge toward the first edge substantially along the line of desired separation as the laser beam traverses the second edge; and applying a cooling jet proximate the laser beam on the surface of the strengthened glass substrate, wherein: