Foam Earpiece Adapts to Ear Canal Geometry
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Solution Overview
Problem
Current earpieces for hearing devices often fail to provide a secure seal against the ear canal due to limited size options, leading to acoustic feedback and discomfort, as they are not adaptable to individual ear canal shapes and sizes.
Innovation Solution
An earpiece with an adaptable part made of foam or gel material that surrounds an adaptor, allowing it to shape and fit the ear canal, combined with a sound outlet channel and vent structure to reduce feedback and ensure secure attachment of the speaker unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed-size domes/earpieces are used, then manufacturing is simplified, but sealing performance deteriorates due to inability to fit individual ear canal shapes
Solution Approach 1:
The earpiece utilizes foam material that changes its physical state from compressed (during insertion) to expanded (when sealing the ear canal). This parameter change allows a single fixed-size earpiece to adapt to different ear canal shapes and sizes, maintaining sealing performance without requiring multiple sizes or complex manufacturing processes
Solution Approach 2:
The earpiece employs a flexible foam structure that can deform and conform to the contours of the ear canal. This flexibility enables the earpiece to create an effective seal across various ear canal geometries while maintaining a simple fixed-size manufacturing approach
2Reliability
If larger domes/earpieces are used to improve sealing, then sealing coverage increases, but comfort deteriorates due to folding and excessive size in the ear canal
Solution Approach 1:
The foam material's compressibility and expandability allow the earpiece to be inserted in a compact state and then expand to fill the ear canal space effectively. This prevents folding and excessive bulk while maintaining comprehensive sealing coverage, thereby improving both sealing and comfort
Solution Approach 2:
The earpiece transitions from a compressed dynamic state during insertion to an expanded static state during use. This dynamic behavior allows the earpiece to adapt to the ear canal space available, providing adequate sealing without causing discomfort from excessive size or folding
3Ease of operation
If smaller domes/earpieces are used to improve comfort, then ear canal space is reduced, but sealing performance deteriorates due to leakage
Solution Approach 1:
The foam's ability to expand from a compressed insertion state to a fuller operational state allows smaller earpieces to achieve adequate sealing. The material fills available space and conforms to ear canal contours, preventing leakage while maintaining comfort by not requiring excessive initial size
4Ease of manufacture
If standard-sized domes/earpieces are used, then production cost is reduced, but acoustic feedback increases due to incomplete sealing
Solution Approach 1:
The foam material's expansion characteristic enables standard-sized earpieces to achieve effective sealing against acoustic feedback. The material fills gaps and conforms to individual ear canal geometries, preventing sound leakage and feedback without requiring custom-sized or complex multi-component designs that would increase production cost
Solution Approach 2:
The flexible foam structure creates an effective acoustic seal by conforming to the ear canal walls. This flexible sealing mechanism prevents acoustic feedback in standard-sized earpieces, eliminating the need for expensive custom-fit solutions while maintaining acoustic performance
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 adaptable earpiece provides a tight seal, reducing or eliminating acoustic feedback and ensuring comfort by conforming to the ear canal's geometry, while the vent structure further minimizes feedback, especially in the high-frequency range.
Implementation Method 1
The adaptable part is resilient and flexible allowing the adaptable part to be elastically deformed (compressed, bent or twisted)
Implementation Method 2
the adaptor comprises a sound outlet channel and at least one vent
Data Source
AI summary
An earpiece configured to be worn in an ear canal of a user is disclosed. The earpiece includes an adaptor having an interface configured to receive at least a part of a speaker unit and hereby be attached to the speaker unit. The earpiece includes an adaptable part, preferably a part made of a foam material or a gel material shapeable to fit the ear canal of the user. The adaptable part at least partly surrounds the adaptor. The adaptor has a sound outlet channel and at least one vent.