Adjustable Eye Relief in Head-Mounted Displays via Movable Optical Assemblies
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Solution Overview
Problem
Electronic head-mounted devices face challenges in customizing interpupillary distance adjustments to accommodate users with varying eye spacings, leading to inadequate eye relief and restricted field of view due to fixed optical assembly designs.
Innovation Solution
Incorporating movable optical assemblies with telescoping supports and guide rods, allowing for adjustable lens and display positioning relative to face bumpers, enabling precise interpupillary distance adjustments and eye relief optimization for users with both shallowly and deeply set eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed optical assembly design is used, then device structure is simple, but eye relief is inadequate and field of view is restricted
Solution Approach 1:
The optical assembly is designed with movable components that can adjust their position. The support structure includes a first portion mounted to the housing and a second portion that can move relative to the first portion, allowing the optical assembly to dynamically adapt to different user eye positions and interpupillary distances, thereby improving eye relief and field of view.
Solution Approach 2:
The support structure is divided into multiple portions (first portion and second portion) that can move independently relative to each other. This segmentation allows the optical assembly to be adjusted in position along the optical axis, enabling customization for different users' eye spacings while maintaining a manageable structural complexity.
2Adaptability or versatility
If fixed optical assembly design is used, then manufacturing is easier, but interpupillary distance adjustment is inadequate
Solution Approach 1:
The optical assembly incorporates movable components that can be adjusted along the optical axis to accommodate different interpupillary distances. The second portion of the support can move relative to the first portion, allowing the system to adapt to various user configurations while maintaining a manufacturable design through standardized mechanical components.
Solution Approach 2:
The movable optical assembly design serves multiple functions: it accommodates different interpupillary distances, adjusts eye relief for users with varying eye positions, and maintains field of view quality. This multi-functional capability is achieved through a single adjustable mechanism rather than requiring multiple fixed assemblies.
3Ease of operation
If optical assembly is moved closer to face bumpers, then eye relief increases for shallowly set eyes, but field of view becomes restricted
Solution Approach 1:
The optical assembly's position along the optical axis can be dynamically adjusted. For users with shallowly set eyes, the assembly can be positioned closer to the face bumpers to improve eye relief. For users with deeply set eyes, the assembly can be positioned farther away to maintain an adequate field of view. This dynamic positioning resolves the contradiction between eye relief and field of view.
Solution Approach 2:
The optical assembly's positioning is customized for different user types. The system can locally adjust the optical assembly's distance from the face bumpers based on the user's specific eye position, providing optimized eye relief for shallowly set eyes while maintaining adequate field of view for deeply set eyes through separate positioning configurations.
Data Source
AI summary
A head-mounted device may include optical assemblies for presenting images to a user. Each optical assembly may have a support with first and second portions that move relative to each other. A motor in each optical assembly may move the second portion of that optical assembly relative to the first portion of that optical assembly. The optical assemblies may each have guide rods along which the second portion of the optical assembly slides relative to the first portion. A lens in each optical assembly may be used to convey an image from a display in the optical assembly to an eye box for viewing by a user. The lens and display may be mounted to the second portion. Face bumpers may be mounted to the first portion. To adjust eye relief, the motor of each optical assembly may move the second portion relative to the first portion.