Adjustable HMD Contact Members for Eye Box Alignment
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Solution Overview
Problem
Head-mounted devices (HMDs) face challenges in accommodating diverse physiological attributes of users, leading to misalignment of the eye box with the wearer's pupil, which degrades the user experience and causes issues like blur, misalignment, and double vision.
Innovation Solution
The HMDs incorporate modular contact members that are adjustable or replaceable, allowing for repositioning of the eye box relative to the wearer's pupil, along with adjustable lenses and light emitters to align the eye box optimally, and mechanisms to vary the distance between lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed-position contact members are used in head-mounted devices, then the device structure is simple, but the device cannot accommodate diverse physiological attributes of users, causing misalignment of the eye box with the wearer's pupil
Solution Approach 1:
The contact member is made adjustable along the optical axis through a drive mechanism, allowing dynamic repositioning to accommodate different user physiological attributes. The drive mechanism enables the contact member to move between multiple positions, transforming a static structure into a dynamic one that can adapt to various eye-box positions while maintaining a relatively simple overall device architecture.
Solution Approach 2:
The device is divided into modular components including the contact member, drive mechanism, and lens assembly. This segmentation allows the contact member to be independently adjusted without affecting other components, enabling adaptability to diverse users while keeping each module relatively simple in design.
2Manufacturing precision
If modular contact members are made adjustable or replaceable to align the eye box with the wearer's pupil, then visual clarity is improved, but the device complexity increases
Solution Approach 1:
The drive mechanism uses a magnetic field generation system instead of complex mechanical linkages to position the contact member. By generating magnetic fields to attract or repel the contact member, the system achieves precise alignment without requiring complex mechanical transmission components, thereby improving alignment precision while limiting the increase in device complexity.
Solution Approach 2:
The system adjusts the position of the contact member by changing magnetic field parameters (strength, direction) rather than using complex mechanical adjustments. This allows for precise control of the eye-box position relative to the pupil with a relatively simple control system, achieving high alignment precision without proportionally increasing device complexity.
Data Source
AI summary
A wearable electronic device can include one or more contact members that are adjustable or otherwise modular to enable movement of an eye box defined within a lens of the wearable electronic device relative to the wearer's pupil. The contact members can be at least partially disposed within a cavity or recess defined within a frame of the wearable electronic device and can be modular such that the member is removably coupled to the frame and can be replaced by a different member having a dissimilar size or shape. Alternatively, or additionally, the member can be adjustable relative to the frame such that the member extends a first distance relative to the frame in one configuration and a second distance different from the first distance in another configuration.