Authenticity Indicator with Cholesteric Liquid Crystal and Volume Hologram
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Solution Overview
Problem
Existing authenticity indicators, such as hologram labels and cholesteric liquid crystal-based indicators, are vulnerable to forgery due to advances in forgery techniques and easy availability of materials, making them ineffective in preventing counterfeiting.
Innovation Solution
A sheet-like authenticity indicator featuring a reflective layer with a cholesteric liquid crystalline structure and a diffractive layer with a volume hologram, where the reflective layer reflects specific light and the diffractive layer diffracts specific light, enhancing authenticity verification and making forgery difficult by requiring specialized facilities and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hologram labels or cholesteric liquid crystal indicators are used for authenticity verification, then authenticity checking is possible, but the indicators become vulnerable to forgery due to advanced forgery techniques and easy material availability
Solution Approach 1:
The patent combines a relief hologram layer and a cholesteric liquid crystal layer into a single authenticity indicator. The relief hologram layer provides optical scattering and image reconstruction, while the cholesteric liquid crystal layer provides wavelength-selective reflection and polarized light modulation. This merging creates a multi-functional indicator that is difficult to forge as both layers must be precisely integrated, addressing the forgery vulnerability while maintaining authenticity verification capability.
Solution Approach 2:
The patent uses a composite structure combining relief hologram material and cholesteric liquid crystal material. The relief hologram layer contains optical scattering particles and image-forming structures, while the cholesteric liquid crystal layer provides wavelength-selective properties. This composite material approach creates an authenticity indicator with enhanced security features that are difficult to replicate without specialized equipment and knowledge of both material systems.
2Ease of manufacture
If relief holograms are used for authenticity indicators, then the indicator can be manufactured, but the production requires much labor and the distinguishability and forgery prevention effect are limited
Solution Approach 1:
The patent merges the relief hologram layer with a cholesteric liquid crystal layer, creating a multi-functional authenticity indicator. The relief hologram layer handles image reconstruction and optical scattering, while the cholesteric liquid crystal layer provides wavelength-selective reflection. This combination enhances forgery prevention by requiring precise integration of two different material systems, while the relief hologram component maintains ease of manufacture through established holographic techniques.
3Measurement precision
If the reflective layer and diffractive layer are combined in the authenticity indicator, then authenticity verification accuracy is enhanced, but the device complexity increases
Solution Approach 1:
The patent combines a reflective layer with cholesteric liquid crystal structure and a diffractive layer with volume hologram into a single integrated authenticity indicator. The reflective layer provides wavelength-selective reflection, while the diffractive layer provides optical scattering and image reconstruction. Although this increases structural complexity, the layers are designed to work together synergistically, with the reflective layer enhancing the visibility of the diffracted light and the volume hologram providing the authentication image. This integrated approach achieves high verification accuracy while managing complexity through functional integration.
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 combined reflective and diffractive layers provide accurate authenticity verification and are difficult to forge, as the production of a copy requires advanced techniques and special materials, effectively preventing counterfeiting.
Implementation Method 1
a reflective layer including a reflective part, the reflective part having a cholesteric liquid crystalline structure and reflecting a specified light
Implementation Method 2
the reflective part having a cholesteric liquid crystalline structure and reflecting a specified light
Implementation Method 3
a diffractive layer including a volume hologram and diffracting a specified light
Data Source
AI summary
An object of the present invention is to provide an authenticity indicator that cannot be easily forged, that is clearly distinguishable, and that can be elaborately designed. An authenticity indicator 101 is in the form of a sheet and can be checked for its authenticity by observing the light reflected from it. The authenticity indicator comprises a first reflective layer 12 comprising a reflective area 12a that reflects specified light, and a second reflective layer 15 that reflects specified light. The reflective area of the first reflective layer has a cholesteric liquid crystalline structure. The second reflective layer comprises a volume hologram.