Polymer Interlayers for Holographic Optical Elements
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Solution Overview
Problem
Existing polymer interlayers used in laminated glass panels compromise the optical and physical properties of holographic optical elements (HOE) when incorporated into laminates, leading to reduced reflection intensity and potential issues like wrinkling and mottling of the HOE films.
Innovation Solution
Development of specialized polymer interlayers formulated with low refractive index compounds (LRICs) that maintain the desired optical properties of HOE films by minimizing the migration of LRICs, thereby preserving the refractive index gradient and reflection intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polymer interlayers are used in laminated glass panels, then the interlayers can be easily manufactured and processed, but the optical properties of holographic optical elements are compromised leading to reduced reflection intensity
Solution Approach 1:
The patent modifies the chemical composition parameters of the polymer interlayer by incorporating low refractive index compounds (LRICs) such as fluorinated compounds. This changes the refractive index profile of the interlayer material to match the HOE, preventing LRIC migration and maintaining the optical gradient necessary for high reflection intensity while preserving standard lamination processing methods
Solution Approach 2:
The patent creates a composite interlayer material by combining conventional polymer resin with low refractive index compounds. This composite formulation achieves both the optical compatibility needed for HOE performance and the processability required for standard lamination manufacturing
2Reliability
If polymer interlayers are used to encapsulate HOE films, then the HOE films are protected, but the interlayers cause wrinkling and mottling of the HOE films
Solution Approach 1:
The patent adjusts the refractive index parameter of the polymer interlayer by adding LRICs to match the HOE film's optical properties. This parameter matching prevents optical distortion, wrinkling, and mottling while maintaining the protective encapsulation function during lamination and autoclaving processes
3Ease of manufacture
If conventional polymer interlayers are used, then the lamination process can be completed using standard procedures, but the LRICs migrate leading to reduced optical properties
Solution Approach 1:
The patent incorporates LRICs into the polymer interlayer formulation before lamination. This preliminary incorporation ensures that the refractive index match is established in advance, preventing LRIC migration during the standard lamination and autoclaving processes while maintaining optical properties
Solution Approach 2:
The patent modifies the chemical composition of the interlayer by incorporating LRICs, which changes the refractive index profile to match the HOE. This parameter change prevents concentration gradients that would otherwise drive LRIC migration during thermal processing
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 use of these polymer interlayers effectively maintains the optical and physical properties of HOE films, preventing significant reductions in reflection intensity and minimizing issues like wrinkling and bubble formation, while also ensuring cost-effectiveness.
Implementation Method 1
formulated with low refractive index compounds (LRICs) that maintain the desired optical properties of HOE films by minimizing the migration of LRICs, thereby preserving the refractive index gradient and reflection intensity
Data Source
AI summary
Interlayers that exhibit superior properties and that provide desirable optical properties when incorporated into laminates, such as windshields, windows or other glazings containing a holographic optical element (HOE) are disclosed. The interlayers, when used in a laminate in conjunction with the HOE film, maintain and do not detract from the HOE film properties.