Light-Emitting Medium with Selective Transmission for Forgery Prevention
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Solution Overview
Problem
Current security media, such as transparent plastic currency and cards, require additional tools for forgery prevention and authenticity determination, which complicates the process of discriminating between genuine and forged items using normal blacklight.
Innovation Solution
A light-emitting medium with a substrate and two distinct light-emitting regions that emit different colors when irradiated with non-visible light in different wavelength regions, allowing for easy discrimination using normal blacklight, and a method for determining authenticity by confirming light emission under specific wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple fluorescent inks are used to enhance forgery prevention, then the forgery prevention effect is improved, but the complexity of discrimination tools required increases
Solution Approach 1:
The patent applies color changes by using fluorescent substances that emit different colors under different wavelength irradiations. Specifically, the first fluorescent substance emits a first color under first wavelength irradiation while the second fluorescent substance emits a second color under second wavelength irradiation, allowing discrimination without additional tools
Solution Approach 2:
The patent changes the wavelength parameter of the irradiation light to achieve different discrimination effects. By irradiating with different wavelengths (first wavelength vs. second wavelength), the fluorescent substances exhibit different emission colors, enabling simplified discrimination while maintaining high forgery prevention reliability
2Measurement precision
If additional discrimination tools are used to determine authenticity, then the measurement precision is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent makes the light-emitting medium itself multi-functional by incorporating multiple fluorescent substances that respond differently to different wavelength irradiations. This allows the medium to perform both forgery prevention and authenticity determination functions without requiring separate discrimination tools, thereby improving ease of operation while maintaining measurement precision
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
Enables easy and rapid discrimination of light-emitting forms using normal blacklight, enhancing forgery prevention and authenticity determination without the need for additional tools.
Implementation Method 1
a fluorescent substance that emits light when being irradiated with non-visible light in the first wavelength region and also emits light when being irradiated with non-visible light in the second wavelength region
Data Source
Figure 1(A)~1(B)
Figure 2(A)~2(B)
Figure 3(A)~3(B)
AI summary
To provide a light-emitting medium whereby different light-emitting forms can be realized that can easily be discriminated using a normal blacklight, and to provide a forgery prevention medium and a method for determining authenticity of the light-emitting medium. A light-emitting medium 1, 1A provided with a substrate 2 and a first light-emitting region 3 and a second light-emitting region 4 disposed on both sides of the substrate 2, the substrate 2 comprising a selective transmission region for transmitting non-visible light in a first wavelength region and essentially not transmitting non-visible light in a second wavelength region different from the first wavelength region, and the first light-emitting region 3 and the second light-emitting region 4 emitting light when irradiated by non-visible light in the first wavelength region and also emitting light when irradiated by non-visible light in the second wavelength region.