Security elements with subwavelength gratings
A technology of anti-counterfeiting components and grating structure, which is applied in the authenticity inspection of banknotes, handling coins or valuable banknotes, instruments, etc., and can solve problems such as large angle tolerance
Active Publication Date: 2019-08-23
GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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Problems solved by technology
[0010] Known two-dimensional periodic subwavelength gratings with discontinuous surfaces exhibit color filtering properties, but with large angular tolerance
Method used
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Embodiment Construction
[0041] figure 1 A security element S with a double wire grid embedded in a substrate and consisting of two wire grid structures 2 , 6 is shown in cross section. The substrate comprises a dielectric carrier 1 on which a first wire grid structure 2 arranged in a plane L1 is incorporated in a dielectric layer (for example an embossing lacquer layer). The first wire grid structure 2 consists of a first grid 3 having a width b, which extends in the longitudinal direction (ie, the direction perpendicular to the paper). Between the first grids 3 there are first grid gaps 4 which have a width a.
[0042] Each grid 3 is composed of a double layer consisting of a high-refractive material 3a having a thickness t4 and a metallic material 3b having a thickness t2. Thus, the thickness of the first grid 3 (measured perpendicular to the plane L1) is t2+t4. At a height h above the first grid 3 there is a second wire grid structure 6 in the plane L2, which has a second grid 7 which likewise ...
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The invention relates to a security element for producing valuable documents such as banknotes, checks, etc., which security element has: a dielectric substrate (1); a first periodic line grating structure (2), which is embedded in the substrate (1) , and consist of a plurality of first grids (3) extending longitudinally and arranged in a first plane (L1) with first grid gaps (4) therebetween; and having A second wire grid structure of the same period (d) embedded in the substrate (1) and consisting of a second grid (7) extending in the longitudinal direction with a second grid in between gap (8); wherein the second wire grating structure (6) is located in a parallel second plane (L2) above the first wire grating structure (2) relative to the first plane (L1), and wherein the second wire grating structure (6) formed to be inverted with respect to the first wire grating structure (2), so that in a plan view of the first plane (L1), the second grid (7) is located above the first grid gap (4), and The second grid gap (8) is located above the first grid (3), wherein the security element (S) produces a color effect when viewed in perspective (T), and the grid (3) of the first wire grid structure (2) ) and the grid (7) of the second wire grating structure (6) are respectively formed by double layers, and the double layers are composed of high refractive material layers (3a, 7a) and metal material layers (3b, 7b).
Description
technical field [0001] The present invention relates to an anti-counterfeit element for producing valuable documents such as banknotes, checks, etc., the anti-counterfeit element comprises: a dielectric substrate; a first periodic line grating structure embedded in the substrate and extending longitudinally and arranged on A plurality of first grids in a first plane, the first grids having first grid gaps therebetween; and a second wire grid structure with the same period, which is embedded in the substrate and is composed of longitudinally extending The second grid is formed, the second grid has a second grid gap therebetween; wherein the second wire grid structure is located in a parallel second plane above the first wire grid structure with respect to the first plane, and wherein the second wire The grating structure is formed inverted relative to the first wire grating structure so that in a plan view looking down on the first plane, the second grid is located above the fi...
Claims
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IPC IPC(8): B42D25/29B42D25/328G07D7/00B42D25/351
CPCB42D25/29B42D25/351B42D25/328G07D7/003G07D7/12
Inventor H.洛克比勒
Owner GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH