Method for manufacturing a security element having a lens grid image

US11040565B2 · kind B2 · utility

Assignee

• GIESECKE+DEVRIENT CURRENCY TECHNOLOGY GMBH · DE

Inventors

• Andreas Rauch · Ohlstadt, DE
• Christian Fuhse · Otterfing, DE
• Josef Schinabeck · Tegernsee, DE
• André Gregarek · Munich, DE

Key dates

• Filing date: Dec 15, 2017
• Grant date: Jun 22, 2021
• Expiry date: Jan 29, 2038

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B42D25/373
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A method includes using a lenticular image having a lens grid composed of a plurality of microlenses and a metallic motif layer arranged spaced apart from the lens grid; the refractive effect of the microlenses defines a focal plane and the metallic motif layer being arranged substantially in the focal plane; a line width is chosen for the demetalized sub-regions to be produced in the metallic motif layer; a marking laser source having a laser wavelength λ is selected such that the resolving power D(λ) of the microlenses of the lenticular image at the selected laser wavelength λ substantially corresponds to the line width of the demetalized sub-regions to be produced; and the metallic motif layer is impinged on through the microlenses with laser radiation of the marking laser source to produce demetalized sub-regions in the metallic motif layer.