Security Document with Partially Transparent Protective Layer
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Solution Overview
Problem
Counterfeiters can create fake security documents by splitting the base layer of existing security documents, allowing them to separate and replace the laminate layer with new security features, making it difficult to distinguish authentic from counterfeit documents.
Innovation Solution
A security document with a partially transparent protective layer overlying a fibrous substrate and an elongate security element embedded within, which tears the substrate if attempted to be split, making it impossible to reuse and easily identifiable as tampered with.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base layer is made transparent or partially transparent, then the security element becomes visible and can be detected, but the aesthetic appearance and readability of personalised information deteriorate
Solution Approach 1:
The protective layer is designed with spatially varying optical properties: it is transparent in regions where security elements are located (allowing detection) and opaque or translucent in regions where personalised information is printed (maintaining readability). This local differentiation resolves the contradiction between security element visibility and information readability.
2Illumination intensity
If the protective layer is made opaque to hide security elements, then the aesthetic appearance is maintained, but the security element becomes undetectable and counterfeiters cannot be deterred
Solution Approach 1:
The protective layer implements local quality by having different optical transmission characteristics in different spatial regions. Regions overlying security elements are transparent to allow detection, while regions overlying personalised information are opaque to maintain readability, thus resolving the contradiction.
3Reliability
If the security element is made visible to the naked eye, then counterfeiters can be deterred, but the aesthetic appearance and professional quality of the document deteriorates
Solution Approach 1:
The protective layer utilizes optical property changes (transparency/opaqueness) analogous to color changes, being transparent in security element regions and opaque in information regions. This allows security elements to be detectable without creating a uniformly visible appearance that would degrade aesthetics.
Solution Approach 2:
By applying local quality principles, the protective layer selectively controls visibility: security elements are visible through transparent regions while personalised information remains readable through opaque regions, balancing security deterrence with aesthetic appearance.
Data Source
Figure 1A~1D
Figure 2A~2C
Figure 3A
AI summary
The present invention is directed towards a security document (10) comprising a protective layer (14) overlying a fibrous substrate layer (11) and an elongate security element (16) partially embedded in the fibrous substrate layer (11). The protective layer (14) is at least partially transparent such that the fibrous substrate layer (11) is at least partially visible through the protective layer (14). At least one region (18) of the security element (16) is exposed at a surface (12) of the fibrous substrate layer (11) and is adhered to the protective layer (14). At least one region (17) of the security element (16) is embedded within the fibrous substrate layer (11). The at least one exposed region (18) is substantially indistinguishable to the naked eye when viewed in reflected light incident upon the protective layer (14) and the at least one exposed region (18).