Laminated ID Security Feature Using UV Fluorescent Ink
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Solution Overview
Problem
Current identification documents face challenges in providing effective and cost-efficient security features that prevent counterfeiting, as existing methods can be easily circumvented, and there is a need for enhanced authentication measures that are inherently trustworthy.
Innovation Solution
A laminated identification document structure incorporating a clear non-laserable polycarbonate core layer with a cutout filled by clear laserable polycarbonate, sandwiched between opaque layers with ultraviolet fluorescent ink, which creates a unique visual effect visible only under UV light, providing authentication by differing illumination on opposite sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultraviolet fluorescent ink is used as a security feature, then authentication capability is improved, but ease of counterfeiting increases because the indicia can be added following card manufacture
Solution Approach 1:
The security feature is segmented into multiple functional layers: a polycarbonate substrate layer, a UV-absorbing layer, and a fluorescent ink layer. This segmentation allows each layer to perform its specific function while making the overall feature more difficult to counterfeit, as reproducing the layered structure with proper optical properties is complex
Solution Approach 2:
The patent uses composite materials combining polycarbonate substrate with UV-absorbing compounds and fluorescent pigments. This composite structure creates a security feature that exhibits specific optical properties (fluorescence under UV light with UV absorption in visible spectrum) that are difficult to replicate, thereby improving authentication capability while preventing counterfeiting
2Reliability
If complex security features are incorporated to prevent counterfeiting, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The polycarbonate card substrate serves multiple functions: it provides the structural base of the card, acts as a UV-blocking layer to prevent counterfeiting, and serves as the substrate for the fluorescent indicia. This multi-functionality reduces overall complexity while maintaining security
Solution Approach 2:
The security feature utilizes optical property changes - specifically fluorescence under UV illumination and UV absorption in the visible spectrum. This color/optical property change provides a simple yet effective security mechanism that doesn't require complex mechanical or electronic components
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
The solution achieves a repeatable and distinct visual effect on both sides of the ID, enhancing authentication and preventing counterfeiting, while maintaining cost-effectiveness, with the ultraviolet ink fluorescing visibly from both sides regardless of the light source's position.
Implementation Method 1
a layer or area of ultraviolet fluorescent ink... When a UV light source is positioned on a first side of the ID, a pattern of the first cut out is illuminated only on a second side of the ID
Implementation Method 2
the clear laserable polycarbonate softens or melts and fills the void made by the first cut out in the core layer
Data Source
AI summary
A security document with unidirectional visual illumination is disclosed. A security feature is positioned within the document and not visible in normal ambient lighting conditions but becomes visible under specialized lighting conditions, for example in the presence of ultraviolet light. The security feature is constructible such that it is visible only from a single side of the security document, with the side being predeterminable regardless of the orientation of the specialized light.