Method for producing a security element comprising micro-imaging elements

Patent metadata

Field	Value
Publication number	US-12128702-B2
Application number	US-202218546852-A
Country	US
Kind code	B2
Filing date	Feb 18, 2022
Priority date	Feb 19, 2021
Publication date	Oct 29, 2024
Grant date	Oct 29, 2024

Abstract

A method for producing a security element for security papers, valuable documents or the like, includes a carrier having on its top side micro-imaging elements and on its underside structures which, together with the microimaging elements, image a motif in front of the top side of the carrier; the position of the motif being is dependent on the viewing angle.

First claim

The invention claimed is:

1. A method for producing a security element, wherein
a translucent or transparent carrier is provided, which includes an upper side and a lower side,
a first embossing layer is applied to the upper side of the carrier,
multiple micro-imaging elements are introduced into a side of the first embossing layer facing away from the carrier,
a second embossing layer is applied to the lower side of the carrier,
multiple embossing structures are introduced into a side of the second embossing layer facing away from the carrier, wherein a surface area of the second embossing layer in an area of the embossing structures is increased by at least 20% in relation to areas between the respective embossing structures,
wherein the embossing structures together with the micro-imaging elements depict a motif in front of the upper side of the carrier, wherein an orientation of the motif is dependent on a viewing angle,
a metallic layer is applied to a full surface on the side of the second embossing layer facing away from the carrier,
wherein the metallic layer is removed from the embossing structures using an etching method and remains in the areas between the respective embossing structures in which the second embossing layer is sufficiently flat that a continuous metallic layer remains there after the etching method.

2. The method according to claim 1 , wherein in a further step, at least one ink layer is applied to the embossing structures and the areas between the respective embossing structures.

3. The method according to claim 1 , wherein the embossing structures have a height or depth of at least 2 μm to 3 μm.

4. The method according to claim 1 , wherein the micro-imaging elements are formed by focusing elements and the embossing structures are at least partially arranged in a focal plane of the micro-imaging elements.

5. The method according to claim 4 , wherein the focusing elements comprise lenses or hollow mirrors.

6. The method according to claim 1 , wherein the first embossing layer and the second embossing layer are each formed by an embossing lacquer, which is printed onto the carrier.

7. The method according to claim 1 , wherein the security element is applied to security papers or valuable documents.

8. The method according to claim 2 , wherein a further metallic layer is applied to a side of the at least one ink layer facing away from the carrier.

Assignees

• Giesecke & Devrient Currency Technology Gmbh

Inventors

• Heim Manfred

Classifications

• B42D25/445

  using chemical means, e.g. etching · CPC title

• B42D25/425

  by deformation, e.g. embossing · CPC title

• B42D25/29 Primary

  Securities; Bank notes · CPC title

• G02B3/0031

  Replication or moulding, e.g. hot embossing, UV-casting, injection moulding · CPC title

• G02B27/06

  with moving picture effect · CPC title