Method for producing a hologram, and security element and a security document

US11679616B2 · kind B2 · utility

Assignee

• OVD Kinegram AG · CH

Inventors

• Sebastian Mader · Hilden, DE
• Harald Walter · Horgen, CH
• Corrado Fraschina · Luzern, CH

Key dates

• Filing date: Sep 5, 2018
• Grant date: Jun 20, 2023
• Expiry date: Sep 3, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G03H2270/32
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A method for producing a hologram (1), (1) for security elements (1a) and/or security documents (1b). One or more virtual hologram planes (10) are arranged in front of and/or behind one or more virtual models (20) and/or one or more virtual hologram planes (10) are arranged such that they intersect one or more virtual models (20). One or more virtual light sources (30) are arranged on one or more partial regions of the surface (21) of one or more of the virtual models (20). One or more virtual electromagnetic fields (40) are calculated starting from at least one of the virtual light sources (30) in one or more zones (11) of the one or more virtual hologram planes (10). In the one or more zones (11), in each case, a virtual total electromagnetic field (41) is calculated on the basis of the sum of two or more, of the virtual electromagnetic fields (40) in the respective zone (11). One or more phase images (50) are calculated from the virtual total electromagnetic fields (41) in the one or more zones (11). A height profile (60) of the hologram (1) is calculated from the one or more phase images (50) and the height profile (60) of the hologram (1) is incorporated into a substrate (2) t…