Embedded Diffractive Security Elements in Multi-Layer Documents
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing security and/or value documents with diffractive security elements are vulnerable to unauthorized access, as the diffractive security elements are typically applied as a surface layer, making them susceptible to counterfeiting and easy manipulation.
Innovation Solution
A method for producing security documents with at least two stacked substrate layers, where the diffractive security elements are distributed across these layers, requiring non-destructive delamination to access, and allowing for partial areas to feature other security features like printing, with holographic information embedded between layers for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If diffractive security elements are applied as a surface layer (patch), then document integration and ease of manufacture are improved, but document security and resistance to unauthorized access deteriorate
Solution Approach 1:
The patent transitions diffractive security elements from a two-dimensional surface application (patch) to a three-dimensional embedded structure within the document volume. By incorporating holographic material into the substrate layers and exposing it to form volume holograms, the security elements are positioned throughout the depth of the document, making them significantly more difficult to remove or counterfeit while maintaining manufacturing feasibility through standardized layering processes.
2Reliability
If diffractive security elements are embedded in the volume of the document, then document security is improved, but ease of manufacture and production complexity worsen
Solution Approach 1:
The patent divides the document structure into multiple discrete substrate layers, with holographic material applied to specific layers and exposed to form diffractive security elements. This segmentation allows each layer to be processed independently through standardized steps (application, exposure, development), reducing overall production complexity while achieving secure embedded volume holograms throughout the document assembly.
3Reliability
If multiple substrate layers are used with diffractive elements, then security against counterfeiting is improved, but manufacturing precision and alignment requirements worsen
Solution Approach 1:
The patent combines multiple substrate layers into a single integrated document assembly, where the layers are connected to form a unified structure. This merging approach allows the diffractive security elements on different layers to work together as a coordinated system, with the collective arrangement providing enhanced counterfeit resistance while the integrated structure helps maintain alignment through the document's construction process.
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
This approach significantly enhances document security by making unauthorized access difficult, as diffractive security elements are embedded within the document's volume, and allows for the integration of various security features across the visible surface without compromising the security of the holographic information.
Implementation Method 1
a layer of a holographic material is exposed under holographic conditions
Implementation Method 2
A layer of a holographic material is exposed to laser light under holographic conditions
Implementation Method 3
at least one of the substrate layers carries a diffractive security element
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a security and/or valuable document (1) comprising at least two substrate layers (2, 3, 6) connected to one another in stacks, wherein the substrate layers respectively carry a diffractive security element, and a method for production thereof.