Security Device Angular Color Switch via Corrugated Walls
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Solution Overview
Problem
Current security documents face challenges in providing a robust anti-counterfeiting solution that is difficult for counterfeiters to simulate, as existing technologies rely on materials that require light transmission through the structure, limiting material choices and resolution of security features.
Innovation Solution
A security device with a substrate featuring a corrugated structure of alternating first and second walls, each oriented at a different angle, where a layer of material is applied to either or both walls, creating an 'angular color switch' effect that changes with viewing angle, enhancing the complexity and resolution of security patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional fluorescent security features with UV absorbent material are used, then the security device exhibits a transmission color switch effect, but the device requires light transmission through the structure which limits material choices and resolution
Solution Approach 1:
The patent transitions from a planar fluorescent layer structure to a three-dimensional corrugated wall structure. The walls are formed with varying orientations (first walls at a first angle, second walls at a second angle) to create angular-dependent optical effects. This dimensional change eliminates the need for light transmission through the substrate while achieving high-resolution security features through the geometric arrangement of walls with fluorescent coatings.
Solution Approach 2:
Different walls within the corrugated structure are selectively coated with fluorescent materials having different properties. First walls may be coated with a first fluorescent material while second walls are coated with a second fluorescent material, or different portions of walls receive different coatings. This local differentiation creates complex visual effects that change with viewing angle, achieving high resolution without requiring light transmission through the entire structure.
2Reliability
If fluorescent coatings are applied to create security features, then the security device is visible under UV light, but the device becomes visible in visible light reducing its stealth characteristics
Solution Approach 1:
The patent employs fluorescent materials that are invisible or substantially invisible under visible light but emit visible light when excited by UV radiation. The corrugated wall structure enhances this effect by creating angular color switching - the fluorescence appears at different colors or intensities depending on the viewing angle under UV illumination. This provides reliable authenticity verification while maintaining stealth characteristics under normal visible lighting conditions.
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 security device provides a striking visual effect that changes color when viewed from different angles under UV light, increasing the difficulty for counterfeiters and allowing for more complex and high-resolution patterns compared to traditional intaglio printing.
Implementation Method 1
a first fluorescent layer on the first side of the substrate... a fluorescent layer on the layer of UV absorbent material... when the security device is viewed alternately in transmitted and reflected ultraviolet light the fluorescent colour perceived by the viewer changes
Implementation Method 2
a layer of UV absorbent material on the first fluorescent layer... the UV absorbent material prevents the UV light from passing through to that other fluorescent layer
Data Source
Figure 1(a)~2
Figure 3~4(c)
Figure 5~6
AI summary
A method of manufacturing a security device (10) for a security document. The method comprising: providing a substrate (20) having a face (30), the face including a plurality of first walls (50),each first wall (50) being orientated in a first direction and a plurality of second walls (60), each second wall (60) being orientated in a second, different direction; and directing a flow of particles to form a layer of material (70) on one of either (i) each of the plurality of first walls (50) or (ii) each of the plurality of second walls (60).