SMA Earbud and Earpad Fit Adaptation for Acoustic Sealing
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Solution Overview
Problem
Existing headsets struggle to accommodate diverse ear shapes, leading to discomfort and acoustic leakage due to improper fitting, necessitating multiple earbud sizes which increase costs and reduce convenience.
Innovation Solution
Incorporating Shape Memory Alloy (SMA) components in earbuds and earmuffs that adapt to individual ear shapes by deforming based on temperature changes, ensuring a secure and comfortable fit without the need for multiple sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple earbud sizes are provided to accommodate different ear shapes, then adaptability to various users is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The earbud incorporates an SMA component that enables dynamic shape adjustment based on temperature. The contact portion transforms from a rigid fixed shape to a dynamic form that adapts to the user's ear canal geometry through thermal activation, eliminating the need for multiple static size variants.
Solution Approach 2:
The invention changes the physical parameter of the earbud's contact portion by utilizing the phase transition temperature of the Shape Memory Alloy. When the temperature reaches the phase transition point, the SMA component undergoes a crystal structure transformation, causing the contact portion to change its shape and adapt to different ear canal dimensions.
2Adaptability or versatility
If multiple earbud sizes are provided to accommodate different ear shapes, then adaptability to various users is improved, but manufacturing costs increase
Solution Approach 1:
The SMA component embedded in the earbud provides universal adaptability across different user populations. Instead of manufacturing separate earbuds for small, medium, and large ear canals, a single universal design with temperature-responsive SMA material can adapt to fit all user types, reducing inventory complexity and manufacturing costs.
Solution Approach 2:
By utilizing the phase transition property of Shape Memory Alloy, the invention enables a single earbud design to transform its geometric parameters in response to temperature changes. This eliminates the need for multiple manufacturing lines and size variants, simplifying production while maintaining adaptability.
3Ease of manufacture
If traditional fixed-size earbuds are used, then manufacturing is simple, but wearing comfort and acoustic sealing deteriorate due to improper fitting
Solution Approach 1:
The contact portion transitions from a static fixed shape to a dynamic adaptive form through the SMA component. When temperature reaches the phase transition point, the material undergoes transformation, allowing the earbud to automatically adjust its shape to match the user's ear canal geometry, thereby improving both comfort and acoustic sealing.
Solution Approach 2:
The earbud performs self-adjustment through the temperature-responsive SMA component. Upon contact with the user's ear, the heat from the ear canal triggers the phase transition, causing the contact portion to automatically deform and conform to the ear canal shape without requiring manual adjustment or multiple size options.
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 SMA components enable universal fitment across various ear shapes, enhancing wearing comfort, stability, and sound quality while reducing production costs and minimizing acoustic leakage.
Implementation Method 1
The SMA component deforms at ear temperature, to drive the contact portion to abut against an ear canal wall of the user
Implementation Method 2
the SMA component has phase transition temperature, the SMA component has an expanded form in an environment in which temperature is higher than or equal to the phase transition temperature
Data Source
AI summary
This application discloses a headset, where the headset includes an ear housing and an earbud fastened to the ear housing, the earbud includes an earbud body and an SMA component embedded in the earbud body, and the earbud can automatically adjust a shape to adapt to a wearing environment. This application further discloses another headset, where the headset includes a headband and earmuffs connected to the headband, the earmuff includes an ear housing, an earpad fastened to the ear housing, and an SMA component embedded in the earpad, and the earpad can automatically adjust a shape to adapt to a wearing environment. The headset has high wearing comfort. This application further discloses a headset assembly including the foregoing headset and a related method.