Load-Distributing Headband for HMDs
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Solution Overview
Problem
Head-mounted devices for computer-generated reality experiences often suffer from uneven loading distribution across the facial interface, causing discomfort due to the self-weight of the device housing, which can lead to increased loading on the lower portion of the face, potentially dislodging the device.
Innovation Solution
The head-mounted device incorporates a headband with an upper and lower portion, where the upper portion has lower elasticity than the lower portion, and is designed to apply a moment that increases the loading on the upper portion of the facial interface, thereby reducing the loading on the lower portion, using elastic and flexible materials and pivot joints to maintain secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional headband with uniform elasticity is used, then the device can be supported on the user's head, but the loading is unevenly distributed with higher loading on the lower portion of the facial interface causing discomfort and potential device dislodgement
Solution Approach 1:
The headband is designed with non-uniform elasticity, where the upper portion has lower elasticity and the lower portion has higher elasticity. This local differentiation in material properties allows the headband to apply different forces to different regions of the facial interface, specifically reducing loading on the lower portion while maintaining support on the upper portion, thereby resolving the uneven loading distribution problem.
Solution Approach 2:
The patent changes the elasticity parameter of the headband material along its length, creating a gradient where elasticity varies from the upper to lower portion. This parameter change enables the headband to dynamically adjust force distribution based on the weight of the device housing, applying a moment that counteracts the tendency for lower portion loading and improves overall comfort and device stability.
2Reliability
If the headband applies more loading to the upper portion of the facial interface, then the device remains securely positioned, but the loading on the lower portion decreases which could affect device stability
Solution Approach 1:
The headband is configured to apply a moment that acts as a counterbalancing force to the weight of the device housing. By having the upper portion with lower elasticity bear more loading, the headband creates a counter-moment that opposes the gravitational moment trying to rotate the device downward, thereby maintaining device stability while redistributing the loading to improve comfort.
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
This configuration ensures a more comfortable and secure fit by distributing the load more evenly, reducing the likelihood of the device being dislodged and enhancing the overall user experience by maintaining consistent contact with the user's face.
Implementation Method 1
at least part of the headband is elastic and flexible, is movable between an unstretched condition and a stretched condition
Implementation Method 2
the first pivot joint and the second pivot joint are spring-biased to apply the moment to the device housing
Data Source
AI summary
A head-mounted device includes a device housing and a facial interface. The facial interface has an upper portion and a lower portion. A headband is connected to a first lateral side and a second lateral side of the device housing and extends around a head of a user to support the device housing with respect to the user. The headband is configured to apply a moment to the device housing in a direction that urges the upper portion of the facial interface toward a head of user so that a first loading that is applied to the head of the user by the upper portion of the facial interface is higher than a second loading that is applied to the head of the user by the lower portion of the facial interface.