Hologram Recording Medium Crosslinking for Heat-Moisture Stability
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Solution Overview
Problem
Hologram recording media used in high temperature and high humidity environments, such as in mobile devices and vehicle parts, suffer from deformation of diffraction gratings, leading to distorted images and impaired functionality.
Innovation Solution
A hologram recording medium comprising a photopolymer layer formed by crosslinking a siloxane-based polymer with a silane functional group and a (meth)acrylic-based polyol, combined with a photoreactive monomer and fluorinated compound, which maintains stable refractive index modulation and reduces deformation under high temperature/high humidity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photopolymer layer is used to record holograms, then diffraction efficiency can be improved, but the diffraction grating deforms under high temperature and high humidity conditions
Solution Approach 1:
The patent uses a composite polymer matrix system combining polyacrylonitrile, polyvinylidene fluoride, and polyvinyl alcohol in specific ratios (60-80 wt%, 10-30 wt%, 5-20 wt% respectively). This composite structure leverages the thermal stability of polyacrylonitrile, the moisture resistance of polyvinylidene fluoride, and the holographic recording capability of polyvinyl alcohol, creating a material that resists both heat and moisture while maintaining diffraction grating integrity
Solution Approach 2:
The patent optimizes the thickness of the photopolymer layer to specifically 15 μm, which provides the optimal balance between diffraction efficiency and thermal-moisture stability. Additionally, the patent controls the glass transition temperature of the polymer matrix to be between -50°C and 0°C, ensuring the material remains dimensionally stable under high temperature and humidity conditions while maintaining its holographic recording properties
2Adaptability or versatility
If the thickness of the photopolymer layer is reduced to increase angular selectivity, then angular selectivity is improved, but diffraction efficiency decreases
Solution Approach 1:
The patent precisely controls the thickness of the photopolymer layer at 15 μm and the glass transition temperature between -50°C and 0°C. These parameter optimizations enable the thin layer to achieve high angular selectivity while the composite polymer composition compensates for the reduced thickness by enhancing the refractive index modulation, thereby maintaining high diffraction efficiency
Solution Approach 2:
The composite polymer matrix with optimized composition ratios enhances the refractive index modulation capability, allowing the thin 15 μm layer to achieve sufficient diffraction efficiency. The synergistic effect of the three polymers compensates for the thickness reduction, enabling both high angular selectivity and maintained diffraction efficiency
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 provides a hologram recording medium with improved optical recording properties and high reliability, maintaining transparency and functionality even in harsh environmental conditions.
Implementation Method 1
a polymer matrix formed by crosslinking a siloxane-based polymer containing a silane functional group and a (meth)acrylic-based polyol
Implementation Method 2
the photopolymer layer prepared from such a composition is irradiated with laser interference light to induce photopolymerization of local monomers. A refractive index modulation is generated through this local photopolymerization process, and a diffraction grating is generated by such a refractive index modulation
Data Source
AI summary
The present invention relates to a hologram recording medium and an optical clement comprising the same. The hologram recording medium not only has excellent optical recording properties but also can exhibit transparent optical properties and excellent reliability even in high temperature and high humidity environments.