Variable Refractive Index Lens for Head Mounted Display Diopter Adjustment
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Solution Overview
Problem
The increasing prevalence of myopia/hyperopia among users of virtual, augmented, and mixed reality head-mounted display devices necessitates the use of different lenses with varying curvatures and thicknesses, leading to inefficiencies in production due to the need for frequent adjustments of fitting equipment.
Innovation Solution
A lens design featuring a housing made of a first medium with a cavity filled with a second medium of varying refractive index, allowing for the same lens shape to accommodate different refractive indices and thus different diopters, simplifying production and enabling quick adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different curvatures and thicknesses are used for myopia/hhyperopia lenses to accommodate different users, then the lenses can be customized for different refractive needs, but the production efficiency decreases due to frequent adjustments of fitting equipment
Solution Approach 1:
The patent changes the refractive index parameter of the lens material to accommodate different myopia/hhyperopia corrections. By using materials with different refractive indices (e.g., 1.56, 1.60, 1.67, 1.74), the same lens curvature and thickness can serve different refractive needs, eliminating the need to adjust lens geometry for each prescription level.
Solution Approach 2:
The patent makes a single lens design universal by combining it with optical elements having different refractive indices. One lens curvature can work with multiple optical elements to correct different degrees of myopia/hhyperopia, allowing the same lens to serve multiple functions for different users.
2Adaptability or versatility
If different curvatures and thicknesses are used for myopia/hhyperopia lenses, then different refractive indices can be achieved, but the lens design and production process become more complex
Solution Approach 1:
Instead of varying curvature and thickness, the patent changes the refractive index parameter of the optical element to achieve different myopia/hhyperopia corrections. This simplifies the lens design by keeping curvature and thickness constant while achieving refractive diversity through material selection.
Solution Approach 2:
The patent separates the refractive function from the geometric form of the lens. The lens geometry remains standardized while the refractive index of the optical element is segmented into different values to provide various correction levels, simplifying the overall design process.
3Manufacturing precision
If traditional myopia/hhyperopia lenses are used with different curvatures and thicknesses, then user-specific corrections are provided, but the production process requires frequent equipment adjustments reducing efficiency
Solution Approach 1:
The patent maintains manufacturing precision by using standardized lens geometries that are optimized for specific applications (e.g., AR, VR, windproof). By changing the refractive index of the optical element rather than the lens geometry, the production process avoids frequent adjustments, reducing time loss while maintaining precise optical correction.
Solution Approach 2:
The patent prepares multiple optical elements with different refractive indices in advance. During production, the appropriate pre-prepared optical element is selected and installed in the standardized lens, eliminating the need for on-the-spot equipment adjustments and reducing production time.
Data Source
AI summary
A lens includes a housing and a second medium. The housing is made of a first medium. The housing defines a cavity. The second medium fills in the cavity. The second medium has a required refractive index. The second medium is replaceable in the cavity. A lens group including the lens, a head mounted display device including the lens group, and a method for adjusting a refractive index of the lens group are also provided.