Optical Adhesive Refractive Index Control for Smartglasses
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Solution Overview
Problem
Existing adhesives used in optical components for smartglasses face challenges in achieving precise refractive index matching, leading to fluctuations that disrupt the viewing experience due to variations in production processes and materials, particularly in injection molding.
Innovation Solution
A method involving optical analysis and closed-loop control of mixing ratios for multiple starting materials to adjust the refractive index of adhesives, using a camera to evaluate measurement parameters such as color splitting and optical displacement, and implementing a closed-loop control circuit to ensure precise matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesives are used for bonding optical components, then the bonding process is simple, but the refractive index varies between batches causing disrupted viewing
Solution Approach 1:
The patent implements a closed-loop feedback system where the refractive index of the adhesive is measured and compared against target values, and the mixing ratios of starting materials are automatically adjusted based on these measurements to achieve consistent refractive index matching across production batches
Solution Approach 2:
The patent controls the refractive index by precisely adjusting the mixing ratios of multiple starting materials (resin, curing agent, additives) and by controlling curing parameters such as temperature and time, thereby achieving reliable refractive index matching through parameter optimization
2Manufacturing precision
If tight tolerances are applied to each component in a 2-component adhesive system, then the refractive index matching improves, but the manufacturing complexity and tolerance management increase
Solution Approach 1:
The patent achieves precise refractive index matching by controlling the mixing ratios of starting materials to three decimal places and by optimizing curing parameters, thereby obtaining the desired optical properties without requiring extremely tight tolerances on individual components
Solution Approach 2:
The closed-loop system measures the actual refractive index and automatically adjusts the mixing ratios of starting materials, compensating for variations in individual components and reducing the need for strict tolerance control on each component
3Reliability
If injection molding process parameters are adjusted to compensate for refractive index fluctuations, then the optical properties improve, but the process complexity increases
Solution Approach 1:
The patent optimizes injection molding parameters such as temperature, injection rate, and pressure to achieve consistent refractive index in the base material, and further controls the adhesive curing parameters to achieve final refractive index matching
Data Source
AI summary
Various aspects of the disclosure relate to the production of optical components for optical elements used in display devices, such as augmented reality glasses.