Method and device for laser-assisted separation of a portion from a sheet glass element

US11572301B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Fabian Wagner · Heubach, DE
• Andreas Ortner · Gau-Algesheim, DE
• Albrecht Seidl · Niedernberg, DE
• Frank-Thomas Lentes · Bingen, DE
• Jörn GERBAN · Budenheim, DE
• Simon Schmitt · Wiesbaden, DE

Key dates

• Filing date: Jan 15, 2018
• Grant date: Feb 7, 2023
• Expiry date: Nov 17, 2038

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K2103/54
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method for separating a portion from a sheet glass element having a thickness of at least 2 millimeters along an intended separation line that divides the sheet glass element into the portion and a remaining main part is provided. The method includes producing filamentary damages comprising sub-micrometer hollow channels in a volume of the glass sheet element adjacently aligned along the separation line; and heating and/or cooling the glass sheet element to cause expansion and/or contraction so that the portion detaches from the main part along the separation line. The portion and the remaining main part each remain intact as a whole. The step of producing the filamentary damages includes generating a plasma within the volume with laser pulses of an ultrashort pulse laser; and displacing points of incidence of the laser pulses over a surface of the glass sheet element along the separation line.