Method and device for structuring the surface of a hard material coated solid body by means of a laser

US9993895B2 · kind B2 · utility

Assignee

• BOEGLI-GRAVURES SA · CH

Inventors

• Charles Boegli · Marin-Epagnier, CH
• Steffen Weissmantel · Chemnitz, DE
• Günter Reisse · Chemnitz, DE
• Andy Engel · Portola Valley, US
• Rene Boettcher · Lauenhain, DE
• Werner Steffen · Stans, CH

Key dates

• Filing date: Mar 18, 2010
• Grant date: Jun 12, 2018
• Expiry date: May 1, 2031

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B42D25/328
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

In the method for structuring at least one area of a solid body surface provided with a ta-C coating, by means of a first laser, preferably an excimer laser having pulse durations in the nanosecond range, a first structure is produced upon which a second, ripple-like structure is superposed by means of a second laser, preferably having pulse durations in the femtosecond range. Preferentially, the excimer laser structuring is carried out according to the mask projection technique and the femtosecond laser structuring according to the focus technique. This method allows the rational manufacture of very complex, extremely fraud-resistant authentication features and/or of esthetically attractive, optical diffraction effective colored patterns.