Fluorescent Ink Light-Emitting Medium for Anti-Counterfeit Authentication
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Solution Overview
Problem
Current anti-counterfeit measures for valuable papers, such as cash vouchers and identity cards, face challenges in easily and promptly distinguishing genuine from counterfeit items without specialized tools, particularly when slight color or thickness differences between fluorescent inks are present.
Innovation Solution
A light-emitting medium is developed with a substrate containing micro-character rows formed by first and second fluorescent materials, emitting different colors under specific wavelength ranges of invisible light, ensuring the latent image is only visible when appropriate light is irradiated, making it difficult to forge and allowing easy authentication by the naked eye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-emitting image is formed using fluorescent inks that appear the same color under visible light, then the anti-counterfeit effect is enhanced, but the image may be accidentally viewed if there are slight color or thickness differences between the inks
Solution Approach 1:
The patent employs fluorescent materials that exhibit different emission characteristics under different light wavelengths. Specifically, the first and second fluorescent materials are selected to emit light of the same color when irradiated with invisible light within a first wavelength range, but emit light of different colors when irradiated with invisible light within a second wavelength range. This wavelength-dependent color differentiation ensures that the latent image remains hidden under normal viewing conditions while becoming visible only under specific authentication conditions, thereby resolving the contradiction between security and ease of verification.
2Measurement precision
If specialized judging tools are used to detect fluorescent images, then the detection precision is improved, but the authentication process becomes more complex and time-consuming
Solution Approach 1:
The patent designs the light-emitting image to be inherently visible to the naked eye when proper invisible light irradiation is applied. The fluorescent materials are selected and positioned such that the latent image automatically becomes detectable without requiring external judging tools or complex equipment. This self-service approach allows ordinary users to authenticate the valuable paper simply by irradiating it with the appropriate invisible light source and observing the color differences with their eyes, thereby eliminating the need for specialized devices while maintaining high detection precision.
3Adaptability or versatility
If the latent image is made visible under multiple wavelength ranges, then the adaptability is improved, but the security is reduced as the image may be viewed under normal conditions
Solution Approach 1:
The patent applies different fluorescent materials with specific emission characteristics to different locations within the light-emitting image. The first fluorescent material and second fluorescent material are strategically positioned to form the latent image structure, and each material is selected to have specific emission properties for particular wavelength ranges. This localized assignment of fluorescent materials with distinct spectral characteristics ensures that the image remains hidden under normal viewing conditions while becoming visible only when irradiated with the specific invisible light wavelengths designed to excite these particular materials, thereby maintaining security while enabling controlled adaptability.
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 enables easy and prompt confirmation of the light-emitting image and prevents forgery by ensuring the latent image is only visible under specific irradiation conditions, enhancing security and authenticity judgment without requiring tools.
Implementation Method 1
the light-emitting image includes a plurality of first pattern elements containing a first fluorescent material and a plurality of second pattern elements containing a second fluorescent material; when invisible light within a first wavelength range is irradiated, the first fluorescent material and the second fluorescent material emit light of colors that are viewed as the same color with each other; and when invisible light within a second wavelength range is irradiated, the first fluorescent material and the second fluorescent material emit light of colors that are viewed as different colors from each other
Data Source
AI summary
A light-emitting medium having a light-emitting image including first pattern elements formed on a substrate by using a first fluorescent ink containing a first fluorescent material, and second pattern elements formed on the substrate by using a second fluorescent ink containing a second fluorescent material. The first and second pattern elements form a plurality of micro-character rows m, and the first pattern elements form a latent image in the micro-character rows m. The first fluorescent material is made of a fluorescent material which emits light of blue color when UV-A is irradiated, and emits light of red color when UV-C is irradiated. The second fluorescent material is made of a fluorescent material which emits light of blue color or light of a color that is viewed as the same color as the blue color when the UV-A is irradiated, and emits light of green color when the UV-C is irradiated.