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

US6811069B2 · kind B2 · utility

Assignee

• Schott Glas · DE

Inventors

• Dirk Hauer · Nordenham, DE
• Berndt Hoetzel · Wörrstadt, DE

Key dates

• Filing date: Jun 13, 2002
• Grant date: Nov 2, 2004
• Expiry date: Jun 13, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T225/304
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

In the method for cutting flat glass work pieces a laser beam having a linear beam profile followed by a cold spot is moved along a curved dividing line (2) on the work piece. A linear focal point (1) is produced on the work piece by scanning the laser beam. Trajectory data from the curved dividing line (2) is made available during every scanning motion and scanning is controlled so that all points of the curvilinear focal point (1) lie on or coincide with the curved dividing line (2). A length of the curvilinear focal point is adjusted according to the curvature of the curved dividing line by adjusting scanning amplitude of the scanning motion. Preferably the laser beam output is adjusted as a function of the length of the curvilinear focal point.