Method and device for detecting defects in coils of brittle or fracture-prone material which is at least partially transparent, and use of said method and device

US10222342B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Andreas Ortner · Gau-Algesheim, DE
• Fabian Wagner · Heubach, DE

Key dates

• Filing date: Jan 29, 2016
• Grant date: Mar 5, 2019
• Expiry date: Jun 16, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2201/061
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and a device are provided for detecting defects in coils, such as rollable ultra-thin glass, rollable glass films, rollable laminated ultra-thin glasses or films, rollable solar cells, and rollable organic light emitting diodes (OLEDs). The method includes: providing a glass ribbon in a coil with a shape of a hollow cylinder with two end faces and one ribbon surface; introducing light into a first of the two end faces so that the light is directed from a light entrance side at the first of the two end faces to a light exit side at a second of the two end faces and exits from the light exit side; detecting the light at the light exit side with a first optical imaging detector so that, if a crack is present, the crack is seen as a shading in an image captured by the first optical imaging detector.