Wearable Device Facial Interface with Variable Stiffness Cushion
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Solution Overview
Problem
Wearable devices, such as head-mounted displays, often cause discomfort due to uneven distribution of pressure on the facial regions, leading to discomfort and potential light exposure.
Innovation Solution
A facial interface system with varying stiffness portions, where the upper facial region is engaged with a higher stiffness than the lower and side facial regions, using a deformable core with different foam materials to distribute pressure effectively and block environmental light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a head-mounted display applies pressure to the facial regions to secure the device, then the device stability is improved, but the user comfort deteriorates due to uneven pressure distribution
Solution Approach 1:
The cushion incorporates regions of varying stiffness (first, second, and third regions with different stiffness values) to distribute pressure non-uniformly across different facial regions. The higher stiffness regions (first and third regions) engage with bony areas like the forehead and cheeks to provide stable anchoring, while the lower stiffness region (second region) engages with softer tissue areas to provide comfort. This local differentiation of mechanical properties resolves the contradiction by enabling both stable device mounting and user comfort simultaneously.
2Ease of manufacture
If the facial interface uses uniform stiffness material, then the manufacturing is simplified, but the pressure distribution becomes uneven causing discomfort
Solution Approach 1:
The cushion is designed with spatially varying stiffness properties through different regions (first, second, third regions) that engage with different facial areas. This local quality approach creates non-uniform pressure distribution tailored to facial anatomy while maintaining a single integrated cushion structure that can be manufactured as one piece, thus balancing manufacturing simplicity with pressure distribution uniformity.
Solution Approach 2:
The cushion employs composite construction with multiple foam layers or regions of different densities and stiffness values arranged in specific spatial configurations. This composite structure enables tailored pressure distribution across facial regions while being manufacturable through conventional foam molding techniques, resolving the contradiction between manufacturing ease and pressure distribution performance.
3Ease of operation
If the cushion material is too soft to provide comfort, then user comfort is improved, but the device becomes unstable and may shift position
Solution Approach 1:
The cushion employs local quality differentiation with stiffer first and third regions positioned at the forehead and cheek areas to provide stable anchoring points, while the softer second region is positioned at the nose bridge area to provide comfort. This spatial variation in stiffness allows the device to remain stable through rigid contact points while maintaining comfort through compliant contact points, resolving the contradiction between comfort and stability.
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
The system provides comfort by distributing pressure more evenly and effectively blocks environmental light, reducing discomfort and improving the user experience.
Implementation Method 1
The first foam material and the second foam material may overlap each other with varying thicknesses to gradually change between the first stiffness and the second stiffness
Data Source
AI summary
A wearable device includes a support and a cushion that is coupled to the support, the cushion including a first portion and a second portion, the first portion having a first stiffness, the second portion having a second stiffness, and the first stiffness is at least four times greater than the second stiffness.