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Security document and element

A technology of security elements, elements, applied in the directions of textiles and paper, chemical instruments and methods, lamination, etc., can solve problems such as difficulty in changing the thickness of layers

Active Publication Date: 2018-09-28
OBERTHUR FIDUCIAIRE SAS (PREVIOUSLY KNOWN AS FCO 2 SAS)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The disadvantage of these types of methods is that it is difficult to change the thickness of the layer during the metallization step

Method used

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  • Security document and element
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] In this patent application, including the claims, the following table has the following definitions:

[0048] -A layer with a variable optical effect: This is a layer that provides at least one change in the appearance visually perceivable by the naked eye according to observation conditions when observed. This thus includes the color shift effect produced by tilting, rotating the substrate, etc. It also includes, but is not limited to, for example, optical effects obtained with lens micro-optics or lens systems, reflective or diffractive micro-relief structures, effects of contrast changes, gloss (transition from glossy appearance to matte appearance, etc.).

[0049] -Deep dark opaque layer (or "exposed layer"): This is a layer of sufficiently dark tones used to absorb most of the incident light from the illumination. Ideally, it is black, but it can also be dark blue, dark brown, etc.

[0050] -Semi-reflective layer: This is a layer that becomes reflective when the substra...

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Abstract

The present invention relates in particular to a multilayer security element (2), which comprises a transparent or translucent planar mounting (21), characterised in that one of the opposing faces ofsaid mounting (21) is coated with the following consecutive layers: a) a layer with variable optical effect (22), i.e. which, under observation of the mounting (21), provides at least one change of appearance which is visible to the naked eye, in accordance with the observation conditions; b) a dark opaque layer (23) which has at least one slit (230); c) a semi-reflective layer (24), i.e. which isreflective when the mounting (21) is observed under reflected light, and which is transparent when the mounting is observed by transmission, said semi-reflective layer (24) being provided at least opposite one portion of said slit (230); d) a visible layer (25), i.e. which is visible under reflected light as well as by transmission, provided at least vertically in line with the one or more regions in which the semi-reflective layer (24) is provided.

Description

Technical field [0001] The present invention relates to a multi-layer security element and security documents (such as banknotes) containing it. Background technique [0002] Security documents, more specifically banknotes, are protected by security features. For most notes in circulation, even though the number of detected counterfeit notes usually does not exceed a few units per million notes, the impact of counterfeiting on the image of the issuing country and even on the economy as a whole (if counterfeiting becomes significant) can become a main problem. [0003] To avoid the above, central banks work hard to combat counterfeiting and proactively deal with the problem, especially by increasing the security level of their banknotes and staying ahead of fraudsters technologically. [0004] Counterfeit banknotes can be detected at different levels in the chain of their use. [0005] This can be performed, for example, at a commercial bank that collects bills for use by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/40D21H21/42B42D25/29B42D25/342B42D25/355
CPCD21H21/40D21H21/42B42D25/355B42D25/369B42D25/351B42D25/328B42D25/364B42D25/382B42D25/378B42D25/373B32B27/10B32B38/145B32B2554/00B42D25/29
Inventor 尤利安·吉洛特吉尤姆·沙波格扎维埃·博尔德
Owner OBERTHUR FIDUCIAIRE SAS (PREVIOUSLY KNOWN AS FCO 2 SAS)