Tunable Lens Structure With Variable Rigidity for HMD Curvature Control
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Solution Overview
Problem
Head-mounted devices often have lenses with fixed shapes that struggle to optimally present content to each user, requiring adjustments that are difficult to achieve.
Innovation Solution
A head-mounted device with a lens module featuring a transparent lens element, a fluid-filled chamber, and a lens shaping structure coupled to actuators, allowing for adjustable curvature through segments with varying rigidity, width, thickness, or Young's modulus to accommodate individual user needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lens with fixed shape is used in head-mounted devices, then the device structure is simple, but it is difficult to adjust the lens to optimally present content to each user
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed lens structure into an adjustable one. The lens curvature can be dynamically changed through actuators that modify the lens shaping structure, allowing the optical properties to adapt to different users' needs while maintaining a relatively compact device form factor.
Solution Approach 2:
The lens shaping structure is divided into multiple segments between adjacent extensions, with each segment having independently controllable rigidity properties. This segmentation allows selective adjustment of different portions of the lens to achieve optimal curvature for content presentation while managing overall structural complexity.
2Shape
If the lens shaping structure has uniform rigidity, then the manufacturing is simpler, but it cannot achieve desired curvature between extensions
Solution Approach 1:
The patent implements local quality by providing different rigidity characteristics in different segments of the lens shaping structure. Specifically, portions between adjacent extensions have increased or decreased rigidity relative to other portions, enabling precise control of lens curvature in critical areas while using standard manufacturing techniques for the overall structure.
3Stability of the object's composition
If the lens shaping structure is made more rigid to maintain curvature, then the lens shape stability is improved, but the ability to adjust curvature is reduced
Solution Approach 1:
The system achieves dynamic adaptability by using actuators to modify the rigidity of lens shaping structure segments on demand. The structure can transition between stable configurations, with each configuration maintaining its shape through localized rigidity enhancements while the overall system remains adjustable through actuator control.
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
Enables precise adjustment of lens curvature for optimal content presentation, accommodating varying user eyesight and preferences, enhancing user experience.
Implementation Method 1
a fluid-filled chamber between the two transparent lens elements
Implementation Method 2
a lens shaping structure that is coupled to the transparent lens element, and a plurality of actuators that are configured to adjust a position of the lens shaping structure to adjust the transparent lens element
Data Source
AI summary
A lens module may include a transparent lens element, a lens shaping structure that is coupled to the transparent lens element, and a plurality of actuators that are configured to adjust a position of the lens shaping structure to adjust the transparent lens element. The lens shaping structure may include a plurality of extensions that are each coupled to a respective actuator. To ensure the lens shaping structure has desired curvature between the extensions, the lens shaping structure may have a portion in one or more segments between adjacent extensions that has a property with a different magnitude than an additional portion of the lens shaping structure. The portion between the adjacent extensions may have an increased or decreased rigidity relative to the additional portions. The portion between the adjacent extensions may have a different width, thickness, or Young's modulus compared to the additional portions.