Sicherheitselement und Pigmente zur Herstellung einer Optisch Variablen Tinte

Details

Veröffentlichungs-Nr.

EP4741172

Anmeldetag

31. März 2025

Veröffentlichung

13. Mai 2026

Rechtsraum

EP

Abstract

It is disclosed a security element for protecting valuables. The security element comprises a substantially flat substrate (2) having a surface defining a basic plane, and a printed layer (4) which is applied to the surface of the substrate (2) and comprises pigments (6, 8, 28) for generating a color-shift under white light illumination. The pigments (6, 8; 28) comprise at least one first dielectric layer (18) and at least one second dielectric layer (22) each as a spacer between two layers (14, 16), wherein the first (18) and second dielectric layers (22) have different layer thicknesses, the layer thickness of the first dielectric layer (18) is selected such that the pigments (6, 8, 28) are configured to generate a short wavelength color in reflection at a normal viewing angle (24) normal to the basic plane and under white light illumination, and the layer thickness of the second dielectric layer (22) is selected such that the pigments (6, 8, 28) are configured to generate a long wavelength color in reflection at an oblique viewing angle (26) of 60° relative to the normal of the basic plane and under the white light illumination.

Anmelder

Firma

Giesecke+Devrient Currency Technology GmbH

Land

🇩🇪 Deutschland