Identity Document Security Patch with Dual-Mode Laser Perforation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Identity documents lack an additional layer of security to prevent unauthorized reproduction and verification, as existing security elements are not sufficiently complex to deter duplication.
Innovation Solution
A method is introduced that incorporates a metal patch with perforations forming a pattern observable under visible radiation and a UV-sensitive ink layer, allowing for two distinct patterns to be created within a single metal patch, enhancing security by producing different patterns under visible and UV radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single metal patch with perforations is used to create a pattern under visible radiation, then the manufacturing process is simple and rapid, but the security level is insufficient because the pattern can be easily reproduced
Solution Approach 1:
The patent introduces a second dimension of observation by adding UV-reactive ink that is invisible under visible light but becomes visible under UV radiation. This creates a multi-dimensional security feature where the same metal patch structure serves dual purposes: visible pattern formation and UV-reactive pattern formation, thereby increasing security without adding physical layers
Solution Approach 2:
The patent employs color change principles by using UV-reactive ink that changes from invisible to visible when exposed to UV radiation. This allows the same physical structure to display different patterns under different lighting conditions, making reproduction extremely difficult while maintaining a simple single-layer structure
2Reliability
If multiple security layers are added to increase security, then the document becomes more secure against reproduction, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent merges the function of multiple security layers into a single metal patch structure. The UV-reactive ink is integrated within the same physical layer as the visible pattern, allowing both security features to be manufactured simultaneously in one laser processing step, thus maintaining high productivity while achieving enhanced security
Solution Approach 2:
The metal patch structure serves multiple functions: it creates the visible pattern through perforations, contains the UV-reactive ink for secondary security verification, and maintains structural integrity. This multi-functionality eliminates the need for separate security layers, keeping the manufacturing process rapid and efficient
3Illumination intensity
If the metal patch is made thinner to improve transparency, then the document appears more transparent under visible light, but the laser processing precision required increases
Solution Approach 1:
The patent changes the material parameters by selecting specific metal types and thicknesses that optimize both transparency and laser processability. By carefully controlling the metal layer thickness and composition, the system achieves sufficient transparency while maintaining adequate absorption for precise laser perforation, resolving the trade-off between these two parameters
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
This approach results in a rapid manufacturing process for identity documents with two personalized, difficult-to-reproduce patterns, improving security and authentication through the use of a single manufacturing step, thereby enhancing the document's integrity and authenticity verification.
Implementation Method 1
the metal patch being adapted to be perforated under the action of the laser radiation
Implementation Method 2
a laser device emitting laser radiation and comprising a processing system
Implementation Method 3
an ink layer reacting to a second radiation of wavelength shorter than that of the visible radiation
Data Source
Figure 1a~1b
Figure 1c~2a
Figure 2b~3a
AI summary
The invention relates to a method for manufacturing an identity document (10) from a laser device emitting laser radiation and comprising a processing system, comprising the steps of: - supplying the identity document comprising at least one window (16), a metallic patch (18) and an ink layer (22) reacting to a second radiation (30), - receiving, by the laser processing system, data relating to a first pattern (24), intended to be observable on the metallic patch (18) under visible radiation (19), - decomposing the first pattern (24) into gray-level pixels, each gray level of the pixel corresponding to a dimension of at least one perforation (20) of the patch, - determining a minimum perforation dimension (32) (20) transmitting the second radiation (30), - assigning the minimum perforation dimension (32) to a gray level of the pixel among the ten percent darkest gray levels,- and application of laser radiation to the patch so as to create perforations (20) forming the first pattern (24) observable under visible radiation (19) and forming a second pattern (28) observable under the effect of the second radiation (30.,