Phase-Modulated Fluorescent Images for ID Card Anti-Counterfeiting
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Solution Overview
Problem
Information recording media, such as ID cards, are vulnerable to counterfeiting and forgery due to the potential for security information to be compromised through cryptographic analysis, despite the inclusion of printed security features or ICs storing security information.
Innovation Solution
An information recording medium and authenticity determination method utilizing a substrate with a first image that emits light when irradiated with ultraviolet excitation light and a second image that emits light when irradiated with near-infrared excitation light, both featuring phase-modulated information, which are superimposed to enhance anti-counterfeiting features by displaying different latent images under varying light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If printed security information or IC storing security information is included in the information recording medium, then the security against counterfeits and forgeries is improved, but the security information may be cryptanalyzed and compromised
Solution Approach 1:
The patent divides the security information into multiple segments: a first image visible under first excitation light and a second image visible under second excitation light. These segmented images are superimposed on the same medium but can only be observed separately under different light conditions, preventing complete replication even if one segment is compromised
Solution Approach 2:
The patent changes the observation parameter (excitation light wavelength) to reveal different security images. The first image is revealed under first excitation light while the second image is revealed under second excitation light, making it impossible to capture both images simultaneously with a single detection device, thereby preventing cryptanalysis
2Reliability
If multiple security images are superimposed on the information recording medium, then the anti-counterfeiting capability is enhanced, but the complexity of the security information system increases
Solution Approach 1:
The patent uses a single information recording medium that serves multiple security functions by containing both the first image and second image. This multi-functional approach enhances anti-counterfeiting capability without requiring multiple separate security devices or systems
Solution Approach 2:
The patent creates optical copies of security information that are conditionally visible. The first and second images are optical representations that can only be revealed under specific excitation light conditions, allowing the same physical medium to carry multiple layers of security information without increasing physical complexity
3Measurement precision
If phase-modulated images are used that emit light under different excitation wavelengths, then the authenticity determination accuracy is improved, but the difficulty of detecting and measuring the security information increases
Solution Approach 1:
The patent employs periodic switching between different excitation light wavelengths to reveal different security images. By alternately applying first excitation light and second excitation light, the system enables sequential observation of the first image and second image, improving authenticity determination through time-separated detection
Solution Approach 2:
The patent utilizes wavelength-dependent luminescence where the first image emits light under first excitation wavelength and the second image emits light under second excitation wavelength. This color/wavelength change property allows high-precision authenticity determination while the specialized luminescence characteristics increase the difficulty of detection and measurement for counterfeiters
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 significantly enhances the anti-counterfeiting capabilities by ensuring that the security information changes visibility in a stepwise manner when exposed to different wavelengths, making it difficult to replicate the ID card and improving the authenticity determination process without requiring specialized devices to detect invisible light.
Implementation Method 1
a first image that emits light when irradiated with first excitation light having a first wavelength
Implementation Method 2
a second image that emits light when irradiated with second excitation light having a second wavelength different from the first wavelength
Data Source
AI summary
An information recording medium according to one embodiment includes a substrate, a first image, and a second image. The first image is provided on the substrate, emits light when irradiated with first excitation light having a first wavelength, and includes phase-modulated first information. The second image is provided on the substrate, emits light when irradiated with second excitation light having a second wavelength different from the first wavelength, and includes phase-modulated second information.