Luminescent Security Device with Elementary Patterns
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Solution Overview
Problem
Current security devices for documents, such as banknotes, are difficult to reproduce effectively while being easily identifiable, and existing detection methods are complex or easily deceived by fraudulent reproductions.
Innovation Solution
A security device featuring easily identifiable luminescent colors and precisely positioned elementary patterns that can be identified with the naked eye, using ink excited by specific wavelengths to produce red and green light, with overlapping or spaced patterns creating visible effects under different radiation exposures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex detection devices are used to detect security devices emitting multiple radiations, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The security device is divided into multiple elementary patterns, each emitting a specific radiation at a defined position. This segmentation allows simple detection devices to identify individual patterns and their positions, avoiding the need for complex multi-radiation detection equipment while maintaining high detection accuracy through positional analysis.
2Reliability
If fluorescent signs are used in security devices, then security identification is improved, but ease of reproduction by fraudsters increases
Solution Approach 1:
Each elementary pattern is positioned at a specific location and emits a specific radiation wavelength. The local quality of each pattern (position + wavelength combination) creates a unique security signature that is difficult to replicate without precise positioning equipment, while still being detectable by simple devices that check for the presence and position of these patterns.
3Reliability
If multiple radiations are emitted by the security device, then security effectiveness is improved, but detection device complexity increases
Solution Approach 1:
The security device uses multiple elementary patterns that copy the same structural motif (e.g., stars, circles) at different positions and with different radiation emissions. This copying approach maintains security effectiveness through multiple radiations while allowing simple detection devices to identify the patterns and their positional relationships, avoiding the need for complex detection equipment.
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
Facilitates easy memorization and analysis during second-level checks, limiting fraudulent reproduction by requiring high-performance equipment not readily available to fraudsters, while ensuring high security through visible color changes.
Implementation Method 1
a first elementary pattern (4) in the form of a B and a second elementary pattern (5) in the shape of an F which are both printed on the upper face of the window (1)... the first elementary pattern (4) is produced by means of an ink excited by radiation at a first wavelength λ1 to emit red-colored light while the second elementary pattern (5) is excited by radiation at one second of wavelength λ2, for example at 365 nanometers, to emit green light
Data Source
Figure 1~3
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Figure 7~8
AI summary
The invention relates to a security device, comprising basic luminescent patterns (2, 3) formed on a document so as to react to different excitations, the basic patterns being arranged relative to one another such that a moving overall pattern is formed when the security device is alternately and/or simultaneously subjected to the different excitations.