Circular Polarized Light Identification Medium for Naked-Eye Authentication
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Solution Overview
Problem
Existing identification media requiring a special viewer with two circular polarizing plates for authenticity determination are costly and inaccessible to ordinary users, limiting authenticity verification to registered manufacturers and institutions.
Innovation Solution
An identification medium with a first layer reflecting one circular polarized light and allowing the other to pass through, and a second layer reflecting the same direction and passing the opposite direction, where the reflection ratios satisfy a specific relationship, allowing authenticity determination by the naked eye without a special viewer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an identification medium uses a material with circular polarized light separation function and requires a viewer with two circular polarizing plates for authenticity determination, then the authenticity verification accuracy is improved, but the cost increases and accessibility deteriorates
Solution Approach 1:
The invention extracts the essential authentication function from the complex viewer system by designing an identification medium that displays different images when viewed from the front and back sides. This eliminates the need for expensive circular polarizing plate viewers while maintaining authentication accuracy, making the technology accessible to ordinary users without specialized equipment
Solution Approach 2:
The invention creates a simplified copy of the authentication mechanism by using front-back image differentiation instead of requiring a complex polarizing viewer. The identification medium itself contains the authentication information in a form that can be verified by naked eye observation, replicating the security function without the expensive viewing equipment
2Reliability
If an identification medium uses a material with circular polarized light separation function, then the authenticity determination capability is improved, but the device complexity increases due to requiring a special viewer
Solution Approach 1:
The invention removes the complex viewer structure entirely and embeds the authentication mechanism directly in the identification medium. The medium uses front-back image differentiation to provide reliable authenticity determination without requiring any special viewing equipment, thus eliminating device complexity while maintaining reliability
Solution Approach 2:
The identification medium performs the authentication function itself through its front-back image differentiation property, without requiring external specialized equipment. The medium is self-sufficient for authentication purposes, eliminating the need for complex viewers and reducing overall system complexity
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 cost-effective and user-friendly authenticity verification of the identification medium without the need for specialized equipment, making it accessible to a broader audience.
Implementation Method 1
a first layer which reflects one type of circular polarized light and allows the other type of circular polarized light to pass therethrough
Implementation Method 2
a second layer which reflects at least a portion of circular polarized light having a same rotation direction as that of the circular polarized light which the first layer reflects and allows to pass therethrough circular polarized light having an opposite rotation direction to that of the circular polarized light which the first layer reflects
Data Source
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AI summary
An identification medium including a first layer, and a second layer disposed thereon in a manner of overlapping with the first layer, wherein the first layer is a layer that is capable of reflecting one of clockwise circular polarized light and counterclockwise circular polarized light and allowing to pass therethrough the remaining circular polarized light, the second layer is a layer that is capable of reflecting at least a portion of circular polarized light having the same rotation direction as that of the circular polarized light that the first layer reflects, and allowing to pass therethrough circular polarized light having an opposite rotation direction to that of the circular polarized light reflected by the first layer, and a ratio (Ssf2/S2) of Ssf2 defined by the following formula (2) relative to S2 defined by the following formula (1) is more than 0.7: S2=∫400780Rf2λ∗Rf2λ∧1/2⋅dλ Ssf2=∫400780Rsλ∗Rf2λ∧1/2⋅dλ