Security Element Layered Structure for Document Authentication
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Solution Overview
Problem
Current security elements for documents of value lack sufficient protection against counterfeiting, as they can be easily replicated or altered, compromising authenticity verification.
Innovation Solution
A security element with a layered structure comprising a first and second semi-transparent functional layer, embossing lacquer layers, and an adhesive layer, where the first semi-transparent layer forms a motif visible in reflected light, the second in transmitted light, and a hidden motif visible in both directions when illuminated, enhancing authentication through multi-layer optical effects and micro-optical structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple foil security element is used, then the ease of manufacture is improved, but the protection against counterfeiting deteriorates
Solution Approach 1:
The security element is divided into multiple independent layers (first semi-transparent functional layer, printed layer, second semi-transparent functional layer) that can be manufactured separately and then combined. This segmentation allows each layer to be produced using standard manufacturing processes while the combination creates complex optical effects that are difficult to counterfeit.
Solution Approach 2:
The invention uses a composite structure combining different materials with specific optical properties: semi-transparent functional layers that allow light transmission in one direction while blocking in another, printed layers with hidden motifs, and embossing lacquer layers. This composite material approach creates security features that are difficult to replicate while maintaining manufacturability.
2Reliability
If multiple layers with different optical properties are added, then the protection against counterfeiting is improved, but the device complexity increases
Solution Approach 1:
Multiple functional layers are merged into a single integrated security element that functions as one cohesive unit. The first semi-transparent functional layer, printed layer, and second semi-transparent functional layer are combined with embossing lacquer layers to create a unified structure that provides multiple security functions simultaneously, reducing the overall system complexity despite the increased layer count.
Solution Approach 2:
The semi-transparent functional layers serve multiple purposes: they provide the hidden third motif visible in transmitted light, create the optically variable first and second motifs visible in reflected light, and contribute to the overall structural integrity. This multi-functionality reduces the need for separate components, thereby managing complexity while enhancing security.
3Measurement precision
If hidden motifs covered by semi-transparent layers are implemented, then the measurement precision of authentication is improved, but the ease of operation deteriorates
Solution Approach 1:
The security element incorporates dynamic optical properties where the visibility of motifs changes based on viewing conditions. The hidden third motif appears only in transmitted light, while the first and second motifs are visible in reflected light. This dynamic behavior provides precise authentication cues that adapt to different inspection scenarios, maintaining ease of operation through intuitive visual feedback.
Solution Approach 2:
The semi-transparent functional layers exhibit color and transparency changes depending on the viewing angle and light direction. These optical variations provide clear, easily distinguishable authentication features that improve measurement precision without requiring complex inspection equipment or procedures, thereby maintaining ease of operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly increases protection against forgery by providing multiple, independently recognizable motifs visible under different lighting conditions, making counterfeiting more difficult and enhancing the overall security of documents.
Implementation Method 1
the first semi-transparent functional layer c) forms a first motif recognizable when viewing the front side of the security element in reflected light
Implementation Method 2
the semi-transparent second functional layer f) forms a second motif recognizable when viewing the back of the security element in reflected light
Implementation Method 3
which is recognizable both from the front and from the back when viewing the security element in transmitted light
Data Source
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AI summary
The invention relates to a security element for safeguarding a valuable document or a security paper, wherein the security element has a layer structure having the following layer sequence: a) a first film substrate; b) a first embossing lacquer layer; c) a first semitransparent functional layer; d) a printed layer applied on the first semitransparent functional layer; e) an adhesive layer; f) a second semitransparent functional layer; g) a second embossing lacquer layer; h) optionally a second film substrate; wherein – the first semitransparent functional layer c) forms a first motif, discernible when the front side of the security element is viewed in reflected light; – the semitransparent second functional layer f) forms a second motif, discernible when the rear side of the security element is viewed in reflected light; – the printed layer d) applied on the first semitransparent functional layer forms a hidden third motif, discernible when the security element is viewed in transmitted light both from the front side and from the rear side.