Polarized Identification Medium for Tool-Free Authenticity Checks
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Solution Overview
Problem
Existing identification media require special determination tools for authenticity verification, limiting user accessibility and may lack sufficient anti-counterfeit performance when observed without tools.
Innovation Solution
An identification medium comprising a light reflection layer and a patterned phase difference layer, allowing authenticity determination using polarized sunglasses or liquid crystal displays without the need for specialized tools, through selective observation of reflected light polarization components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a special determination tool including optical members is used for authenticity determination, then the anti-counterfeit performance is improved, but the persons who can perform determination are limited
Solution Approach 1:
The patent introduces a phase difference layer as an intermediary optical element between the light reflection layer and the observer. This phase difference layer acts as a mediator that transforms the optical properties of reflected light in a way that can be observed with simple polarized sunglasses, thereby bridging the gap between high anti-counterfeit performance and general user accessibility without requiring specialized determination tools
Solution Approach 2:
The patent changes the optical parameters of the identification medium by incorporating a phase difference layer that modifies the polarization state of reflected light. By controlling the phase difference (e.g., λ/4 or λ/2 wave plate characteristics) and the orientation of the light reflection layer, the system enables authenticity verification through observable brightness changes when viewed through polarized sunglasses, thus achieving high reliability with accessible tools
2Adaptability or versatility
If a hologram technique is used for identification, then the persons who perform determination are less limited, but the anti-counterfeit performance may be insufficient
Solution Approach 1:
The patent employs a composite structure consisting of a light reflection layer and a phase difference layer working together. This composite optical system combines the properties of selective light reflection with phase modulation capabilities, creating an identification medium that achieves superior anti-counterfeit performance compared to conventional holograms while remaining observable with simple polarized sunglasses
Solution Approach 2:
The patent applies local quality by creating specific optical properties in different layers: the light reflection layer provides selective polarization-dependent reflection, while the phase difference layer introduces localized phase shifts. This spatial differentiation of optical functions within the identification medium enables high anti-counterfeit performance through observable brightness variations when viewed through polarized sunglasses
3Reliability
If determination requires bringing a determination tool close to the identification medium, then the anti-counterfeit performance is improved, but the operation becomes more complex
Solution Approach 1:
The patent extracts the determination function from a specialized close-contact tool and integrates it into a common distant-observation tool (polarized sunglasses). By designing the identification medium to produce observable optical effects at a distance, the system removes the requirement for close-contact determination operations while maintaining high anti-counterfeit performance through the phase difference layer's optical modulation
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
Provides high anti-counterfeit performance and user-friendly authenticity verification using commonly available tools, enabling broad user accessibility and effective differentiation from counterfeit media.
Implementation Method 1
the light reflection layer is a layer that reflects incident light as circularly polarized light or linearly polarized light
Implementation Method 2
the patterned phase difference layer is a layer that includes an area having a phase difference
Data Source
AI summary
An identification medium including a light reflection layer and a patterned phase difference layer, wherein the light reflection layer is a layer that reflects incident light as circularly polarized light or linearly polarized light, and the patterned phase difference layer is a layer that includes an area having a phase difference, and is a layer provided in the identification medium so that the area having a phase difference occupies a partial area of a display surface of the identification medium. Also provided are an article including the identification medium, and a method for using the identification medium wherein, in observation of the reflected light, a linear polarization component or a circular polarization component of the reflected light is selectively observed, or linearly polarized light, circularly polarized light, or elliptically polarized light is made incident as the incident light.