HMD Eye Relief Adjustment Mechanism
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Solution Overview
Problem
Conventional head-mounted displays (HMDs) often fail to accommodate a wide range of user head sizes and eye relief distances, leading to discomfort and poor perception of augmented reality elements due to their bulky and cumbersome design.
Innovation Solution
The HMD features an adjustable crown band with a circumference adjustment mechanism and an eye relief distance adjustment mechanism, allowing the arms to move linearly to secure the display at a comfortable distance from the user's eyes, ensuring proper alignment and fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional HMDs employ pivoting hinge and plate mechanisms to adjust eye relief, then eye relief adjustment is achieved, but the device becomes bulky and cumbersome to manipulate
Solution Approach 1:
The HMD is divided into separate functional modules: a headband portion that contacts the head, and a display portion mounted on an armature that can be independently adjusted. This segmentation allows the eye relief adjustment mechanism to be simplified and localized, reducing overall device bulk while maintaining adjustment capability.
Solution Approach 2:
The armature is designed with dynamic adjustment capabilities, allowing it to move relative to the headband portion. This enables the display portion to be positioned at different distances from the user's eyes without requiring complex fixed mechanisms, thereby reducing bulk while maintaining adaptability.
2Ease of manufacture
If conventional HMDs use fixed design, then manufacturing is simplified, but the HMD cannot accommodate various head sizes and eye relief distances
Solution Approach 1:
The HMD incorporates adjustable components including an adjustable crown band for head size accommodation and an adjustable armature for eye relief distance modification. These dynamic elements allow a single base design to be manufactured simply while providing customization capability through user-adjustable mechanisms.
Solution Approach 2:
The adjustable components are designed as separate, modular elements that can be independently manufactured and assembled. The crown band, armature, and display portion are distinct modules that can be produced using standard manufacturing processes, maintaining ease of manufacture while enabling adaptability through combination and adjustment.
3Reliability
If the HMD is made tight to accommodate small head sizes, then small heads are comfortable, but large heads experience discomfort and the HMD moves relative to the head
Solution Approach 1:
The crown band is designed to be adjustable in circumference, allowing it to be tightened for small heads or loosened for large heads. This dynamic adjustment capability ensures consistent comfort and stability across different head sizes without compromising the secure fit needed to prevent HMD movement during use.
Data Source
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AI summary
A head mounted display (HMD) may comprise an adjustable crown band, a crown band circumference adjusting mechanism coupled to the adjustable crown band and configured to adjust a crown band circumference to releasably secure the crown band to the user's crown, an armature including left and right arms, each of the left and right arms mounted at a respective proximal end to corresponding left and right HMD attachment structures, a display mounted at left and right sides to respective distal ends of the left and right arms, and an eye relief distance adjustment mechanism configured to move the left and right arms in a timed manner toward and away from the crown band along a substantially linear path, to thereby adjust an eye relief distance from the display to an eye of a the user when the crown band is fitted on the crown of the user.