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Anti-counterfeit element, value document and method for producing anti-counterfeit element

A technology for anti-counterfeiting elements and valuable documents, applied in optical elements, printing, optics, etc., can solve the problem of not being able to show the first diffraction order, and achieve the effect of strong intensity or color contrast

Active Publication Date: 2018-07-17
GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it does not show the clearly perceivable first diffraction order in reflection, since the grating period lies in the sub-wavelength region

Method used

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  • Anti-counterfeit element, value document and method for producing anti-counterfeit element
  • Anti-counterfeit element, value document and method for producing anti-counterfeit element
  • Anti-counterfeit element, value document and method for producing anti-counterfeit element

Examples

Experimental program
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Embodiment Construction

[0067] In the drawing, an embodiment of the security element 1 is described below, which provides a perspective view in transmission and a reflection view in plan view. The image is generated by the grid structure 4 .

[0068] In one embodiment, the security element 1 is applied to a transparent film 2 with an embossed varnish layer 3 thereon. A grid structure 4 is formed in the embossing varnish layer 3 , which has groove-shaped microcavities 5 , 6 , for example of different depths. There is a flat strip 7 between the microcavities 5 , 6 . As will be explained further, the microcavities 5 , 6 and the strips 7 have a width that does not permit resolution with the naked eye.

[0069] figure 1 It is shown that the security element in one embodiment has two regions I and II, wherein the geometry of the grid structure 4 differs in the two regions. exist figure 1 In the embodiment in , this difference lies on the one hand in the period (with which the microcavities 5 , 6 and t...

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PUM

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Abstract

A security element for producing a value document provides at least one image (11), wherein said image (11) is formed by a grid structure (4) having a plurality of groove-like microcavities (5, 6), the microcavities ( 5,6) having a structure width (w) of 0.5 μm to 3 μm and an aspect ratio of 0.4 or more, the coating is laid on the grid structure (4), and the grooves in the grid structure (4) The microcavities ( 5 , 6 ) are separated from each other by strips ( 7 ) which are flat and each have a width greater than 200 nm and a maximum of 1200 nm.

Description

technical field [0001] The invention relates to a security element for producing value documents such as banknotes, checks or the like, which has a substrate with an upper side and provides at least one image, wherein the image is passed through a lattice with a plurality of microcavities. grid structure, and these microcavities respectively have a structure width of 0.5 μm to 3 μm in a spatial direction parallel to the upper side, and have a structure depth perpendicular thereto, and have a depth and width defined by the ratio of the structure depth to the structure width Ratio, and lay a metal-containing coating on the grid structure. [0002] The invention also relates to a value document having such a security element. [0003] The invention also relates to a method for producing a security element for value documents such as banknotes, checks or the like, which security element provides at least one image, wherein a substrate with an upper side is formed for producing th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B42D25/425B42D25/351B42D25/328B42D25/373
CPCB42D25/328B42D25/351B42D25/373B42D25/425G02B5/1842G02B5/1866G02B5/1861B42D25/29
Inventor H.洛克比勒
Owner GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH