Composite Earcushion Acoustic Isolation via Foam-Polymer Layering
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Solution Overview
Problem
Conventional headphones lack effective noise isolation and comfort due to inadequate materials in their earcushions, which fail to efficiently absorb or reflect acoustic frequencies within the range of human hearing, leading to external noise interference and discomfort during use.
Innovation Solution
A headphone cushion comprising a partially reticulated polymeric foam body with a high-density polymer layer and a snap ring that forms an acoustic wall, combined with a non-porous film, to enhance passive transmission loss and comfort by embedding a snap ring with a concave surface that engages retention elements of the earcup, improving noise isolation and acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional materials are used in earcushions, then manufacturing cost is low and ease of manufacture is high, but passive transmission loss performance is insufficient and noise isolation is poor
Solution Approach 1:
The earcushion combines a reticulated foam core with a high-density polymer outer layer to create a composite structure that achieves superior passive transmission loss performance across the 0.2 kHz to 6.5 kHz frequency range while maintaining comfort and noise isolation
2Ease of operation
If conventional earcushion materials are used, then device complexity is low, but comfort and acoustic energy absorption are insufficient
Solution Approach 1:
The earcushion employs different materials with distinct properties in different regions: the reticulated foam provides comfort and conformability to the ear, while the high-density polymer layer provides noise isolation and acoustic energy absorption, with each material optimized for its specific function
3Object-affected harmful factors
If simple earcushion structures are used, then ease of manufacture is high, but sealing performance and noise isolation are poor
Solution Approach 1:
The earcushion is divided into two distinct segments: an inner reticulated foam body and an outer high-density polymer layer. This segmentation allows each layer to be optimized for its specific function (comfort vs. noise isolation) while being manufactured as an integrated composite structure
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 solution significantly improves passive transmission loss across the frequency range of 0.2 kHz to 6.5 kHz, reducing external noise and enhancing audio quality while providing increased comfort through improved sealing and acoustic energy absorption.
Implementation Method 1
absorb noise such as audio rendered by an audio driver of the headphones that is reflected from a portion of the user's ear or head, or any reverberant sound wave within the earcushion plenum
Implementation Method 2
absorb noise such as audio rendered by an audio driver of the headphones that is reflected from a portion of the user's ear or head, or any reverberant sound wave within the earcushion plenum
Data Source
AI summary
A headphone cushion includes a body formed of a partially reticulated polymeric foam and including a front surface configured to engage or surround an ear or head of a user, side surfaces, and a rear surface. The headphone cushion further includes a layer of high-density polymer material extending over at least a portion of the body.