Luminescent Security Device With Embedded Window Patterns
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Solution Overview
Problem
Existing security devices for documents, such as banknotes, are vulnerable to fraudulent reproduction due to their simplicity and lack of differentiation, especially when using fluorescent signs that can be easily mimicked.
Innovation Solution
A luminescent security device featuring at least two elementary patterns on a transparent window, where one pattern is printed on the surface and the other is embedded within the window, utilizing filtration properties to create a complex and easily identifiable overall pattern under controlled excitation, increasing difficulty in reproduction while allowing easy verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single fluorescent sign is used on the document, then the security device is simple to manufacture and apply, but it is easily reproduced by fraudsters and lacks sufficient security
Solution Approach 1:
The security device is divided into multiple independent luminescent elementary patterns (first pattern on front face, second pattern inside window, third pattern on back face) that can be individually manufactured and positioned, yet collectively form a complex security feature that is difficult to reproduce
2Reliability
If multiple luminescent patterns are arranged to react to controlled excitations through filter members, then the security combinations are multiplied and reproduction difficulty increases, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The security device transitions from two-dimensional surface printing to three-dimensional arrangement by embedding the second luminescent pattern inside the transparent window thickness, creating multiple spatial layers that increase security while maintaining manufacturing feasibility
Solution Approach 2:
Filter members are introduced as intermediary elements between the luminescent patterns and the observer, enabling the same physical patterns to produce different visual effects (color filtering, wavelength selection) and thereby multiplying security combinations without adding more physical patterns
3Measurement precision
If luminescent patterns are precisely positioned with respect to each other, then the security verification becomes more reliable and fraud detection more accurate, but the manufacturing precision requirements increase
Solution Approach 1:
Different regions of the transparent window are assigned different functions: the front face receives the first luminescent pattern for visual identification, the interior contains the second pattern for embedded security, and the back face receives the third pattern for verification, with each location optimized for its specific security function
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 enhances security by creating a complex pattern that is difficult to replicate while allowing easy verification, leveraging the transparency of the document to provide a secure and easily memorable control mechanism.
Implementation Method 1
at least two luminescent elementary patterns which are arranged to react to excitations applied in a controlled manner to the window
Implementation Method 2
security devices are known in the form of stamps or ribbons comprising fluorescent signs
Implementation Method 3
By playing on the filtration properties of the filtering member, which can be arranged on the surface of the window or inside the window
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a security device for a document comprising a transparent window, which includes at least two basic luminescent patterns (12, 13, 14, 15) arranged so as to react to excitations applied to the window in a controlled manner via at least one filtering device (10, 11). According to the invention, a first basic pattern is formed on a first surface of the transparent window and a second pattern is formed entirely within the body of the transparent window.