Security element for a document of value and/or a security document

Patent metadata

Field	Value
Publication number	US-2016303889-A1
Application number	US-201314442183-A
Country	US
Kind code	A1
Filing date	Nov 15, 2013
Priority date	Nov 16, 2012
Publication date	Oct 20, 2016
Grant date	—

Abstract

A security element for a document of value is arranged on a transparent layer such as a film and includes a first periodic, optical structure, for example a grid of lines or a grid of points, which forms a first coating on a first side of the transparent layer, and a second periodic, optical structure, for example a grid of lines or a grid of points, which forms a second coating on the second side, which is disposed opposite the first side of the transparent layer. The first optical structure and the second optical structure overlap such that, as viewed by outside observer at a certain, predetermined viewing angle (α) or lighting angle, the structures show a color-changing effect.

First claim

1 . (canceled)

2 . (canceled)

3 . A security element for a document of value, a security document, or both, comprising:
a layer that is transparent in the visible and UV wavelength ranges; a first periodic, optical structure in the form of a grid of lines or a grid of points, which forms a first coating on a first side of the transparent layer; and a second periodic, optical structure in the form of a grid of lines or a grid of points, which forms a second coating on a second side of the transparent layer, which is disposed opposite the first side of the transparent layer; wherein the first optical structure and the second optical structure overlap and exhibit a color changing effect for an outside observer as viewed from a certain, predetermined viewing angle (α) and under UV radiation; wherein the first coating contains a first color, which is not transparent for UV light, and pigments, which have a visible chromatic or achromatic surface color, and the second coating has at least one second color, which is different from the first color and contains luminescent pigments; and wherein the first optical structure and the second optical structure are disposed relative to one another such that the elements of the first optical structure fully overlap the elements of the second optical structure as viewed from a certain, predetermined angular range of viewing or illumination.

4 . The security element according to claim 3 , wherein a thickness (d) of the transparent layer is in a range from 50 μm to 800 μm.

5 . The security element according to claim 3 , wherein the grid of lines of the first optical structure extends parallel to the grid of lines of the second optical structure, at least in sections.

6 . The security element according to claim 3 , wherein a separation between two adjacent structural elements of the first optical structure, the second optical structure or both is 0.1-fold to 100-fold a thickness of the transparent layer.

7 . The security element according claim 3 , wherein a width of the elements of the first optical structure, the second optical structure or both is 0.1-fold to 100-fold a thickness of the transparent layer.

8 . The security element according to claim 3 , wherein the first optical structure, the second optical structure, or both, in totality, contain information in the form of an image, text, numbers or a combination the image, the text and the numbers.

9 . The security element according to claim 3 , wherein the first optical structure, the second optical structure or both are applied by a printing process.

10 . (canceled)

11 . The security element according to claim 3 wherein the first coating additionally comprises luminescent pigments, which preferably emit electromagnetic radiation having a wavelength, which differs from a wavelength of the luminescent pigments of the second coating.

12 . A document of value, a security document or both comprising a security element according to claim 3 .

13 . The document of value, a security document or both, according to claim 12 , wherein the security element is disposed in a window of the document of value, the security document or both.

14 . The security element according to claim 4 , wherein the thickness (d) of the transparent layer is in a range of from 70 μm to 250 μm.

15 . The security element according to claim 4 , wherein the thickness (d) of the transparent layer is in a range of from 100 μm to 150 μm.

16 . The security element according to claim 6 , wherein the separation between two adjacent structural elements of the first optical structure, the second optical structure or both is 0.5-fold to 10-fold the thickness of the transparent layer.

17 . The security element according to claim 16 , wherein the separation between two adjacent structural elements of the first optical structure, the second optical structure or both is 0.5-fold to 3-fold the thickness of the transparent layer.

18 . The security element according claim 7 , wherein the width of the elements of the first optical structure, the second optical structure or both is 0.5-fold to 10-fold the thickness of the transparent layer.

19 . The security element according to claim 9 , wherein the printing process is selected from the group of printing processes consisting of offset lithography, letterpress printing, rotogravure, soft-ground etching and digital printing.

20 . The security element according to claim 19 , wherein the printing process is selected from the group of printing processes consisting of intaglio printing, an offset printing process and an inkjet printing process.

Assignees

• Bundesdruckerei Gmbh

Inventors

• Gutmann Roland
• Mombree Alexander
• Knebel Michael
• Kunath Christian
• Ehreke Jens

Classifications

• B42D25/387 Primary

  absorbing or reflecting ultraviolet light · CPC title

• B42D25/378

  Special inks · CPC title

• B42D25/351

  Translucent or partly translucent parts, e.g. windows · CPC title

• B42D25/29

  Securities; Bank notes · CPC title

• B42D25/342

  Moiré effects · CPC title