Semi-finished product, security element, methods of producing them and document of value

US12189157B2 · kind B2 · utility

Assignee

• GIESECKE+DEVRIENT CURRENCY TECHNOLOGY GMBH · DE

Inventors

• Carlos Carrasco · Madrid, ES
• Beatriz Cerrolaza · Madrid, ES
• Winfried Hoffmuller · Bad Tölz, DE
• Friedrich Kretschmar · Munich, DE
• Denise Schwab · Munich, DE

Key dates

• Filing date: Jul 29, 2022
• Grant date: Jan 7, 2025
• Expiry date: Jul 29, 2042

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B42D25/355
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A semi-finished product method with a liquid crystal security feature includes unrolling and transporting a continuous film in a transporting direction and providing on the film a liquid crystal layer containing a substance whose absorption of polarized light depends on its orientation. The method includes at least one of (A) arranging a lacquer layer on the film and embossing it for a first alignment structure, and at least partly covering it with the liquid crystal layer, the first alignment structure able to cause liquid crystal molecules of the liquid crystal layer to align only in a first direction in first regions and only in a second direction, in second regions, and (B) embossing the liquid crystal layer while the liquid crystal layer is uncured providing a second alignment structure to cause liquid crystal molecules to align only in a third direction in third regions and only in a fourth direction, in fourth regions.