Rotatable Hybrid Ear Cushion for Glasses Comfort
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Solution Overview
Problem
Conventional headphones, particularly supra-aural and circum-aural types, are uncomfortable for long-term wear, especially for individuals wearing glasses, due to design issues such as ear compression and bulkiness, which affects aesthetics and user experience.
Innovation Solution
A hybrid ear cushion design with a softer upper rim and a firmer lower rim, made from lightweight materials, allows for rotational adjustment to fit comfortably over the ear and accommodate glasses, combined with an adjustable headband for snug fit and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If supra-aural headphones are used, then audio quality is improved, but comfort deteriorates due to ear compression
Solution Approach 1:
The ear cushion is divided into two distinct zones: an upper supra-aural portion that fits over the ear canal for audio quality, and a lower circum-aural portion that rests on the earlobe for comfort. This segmentation allows each zone to perform its optimal function without compromising the other.
Solution Approach 2:
Different portions of the ear cushion have different densities and properties. The upper rim uses lower density foam for softer sensation and glasses accommodation, while the lower rim uses higher density foam for structural support and earlobe contact. This local differentiation resolves the contradiction between audio quality and comfort.
2Ease of operation
If circum-aural headphones are used, then comfort is improved, but aesthetics deteriorate due to bulkiness
Solution Approach 1:
The ear cushion is segmented into upper and lower portions with different functional characteristics. The upper portion provides a sleek, minimal profile for aesthetics, while the lower portion provides the necessary bulk and support for comfort, eliminating the need for overall bulkiness.
Solution Approach 2:
The ear cushion employs asymmetric density distribution where the upper rim has lower density and the lower rim has higher density. This asymmetric design allows the cushion to conform to the ear's anatomy while maintaining a streamlined appearance that is both comfortable and aesthetically pleasing.
3Ease of manufacture
If uniform density foam is used in ear cushion, then manufacturing is simplified, but comfort deteriorates for glasses wearers
Solution Approach 1:
The ear cushion uses different foam densities in different locations: lower density foam in the upper rim area where glasses temples make contact, and higher density foam in the lower rim area for structural support. This local quality differentiation enhances comfort for glasses wearers while remaining manufacturable using standard foam extrusion techniques.
Solution Approach 2:
The ear cushion is constructed from composite foam structures with varying densities. The upper rim portion uses lower density foam material while the lower rim portion uses higher density foam material, creating a composite structure that optimizes both comfort and manufacturability.
4Device complexity
If fixed ear cushion positioning is used, then device complexity is reduced, but adaptability deteriorates for different head shapes
Solution Approach 1:
The ear cushion is made rotatable about its central axis, allowing dynamic adjustment of its orientation. This rotational capability enables users to adapt the cushion positioning to different head shapes and glasses configurations without adding complex mechanical structures, maintaining simplicity while enhancing adaptability.
Solution Approach 2:
The ear cushion is pre-formed with a specific curvature and density distribution that is optimized for comfort, and the rotatable mechanism is pre-configured to allow adjustment within a limited range. This preliminary design provides adaptability while keeping the mechanism simple and easy to operate.
Data Source
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AI summary
A headphone device 10 comprises an adjustable headband 12 and a pair of sound outputting ear cups 14 one at each end of the headband. The ear cups 14 comprise an ear cushion 20 which is a hybrid of supra-aural and circum-aural ear cups, The upper part of the ear cushion 20 fits over the top of a user's ear and the lower part of the ear cushion 20 rests on the ear lobe of the user's ear. Each ear cushion 20 is rotatable about its central axis to allow users to adjust the positioning of the ear cushions to most comfortably fit over their ears. Such rotation provides the users to adjust the cushion 20 so that the narrowest part of the cushion sits over the very top of their ear. In case of users wearing glasses or spectacles, this rotational feature also enables the users to rotate the cushion 20 so that the softer area of the cushion is in line with the temple of their glasses depending on where the glasses sit in different people.