Hearing Aid Speaker Unit with Nested Microphone and Two-Component Dome
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Solution Overview
Problem
Existing hearing aid designs face challenges in separating the audio paths of the speaker and microphone, leading to difficulties in orientation, size constraints, user dexterity issues, and accurate sound pressure level measurement.
Innovation Solution
The hearing aid features a speaker unit with a receiver outlet and microphone inlet placed side by side, separated by a wall, and a two-component dome with a harder interface and softer outer portion, allowing for a snap-on connection and integrated wax protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both microphone and speaker channels are implemented in the speaker to dome interface, then the audio path separation is achieved, but the total size of the earpiece becomes large and difficult to fit into smaller ear canals
Solution Approach 1:
The patent implements nesting by placing the microphone inlet channel inside the speaker outlet channel. The microphone inlet is positioned concentrically within the speaker outlet structure, allowing both audio paths to share the same spatial envelope. This nested configuration enables effective audio path separation while maintaining a compact earpiece size suitable for small ear canals.
2Volume of moving object
If the dome is made small for better fit, then the earpiece size is reduced, but the user interface becomes difficult to manipulate for users with reduced dexterity and vision
Solution Approach 1:
The patent applies local quality by creating a two-component dome structure with distinct material properties. The first component (inner dome) is made of harder material providing structural integrity and precise fit, while the second component (outer dome) is made of softer, more compliant material that is easier to manipulate and insert. This localized differentiation of material properties allows the small dome to maintain both compact size and ease of operation for users with reduced dexterity.
3Measurement precision
If the receiver outlet and microphone inlet are separated by a wall, then accurate SPL measurement is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the separation wall function with the existing channel structures. The wall separating the receiver outlet and microphone inlet is integrated into the earpiece housing as a multifunctional element that simultaneously provides acoustic isolation, structural support, and defines the channel pathways. This merging approach achieves accurate SPL measurement through effective audio path separation while minimizing additional complexity by combining multiple functions into a single integrated structure.
Data Source
AI summary
A hearing aid with an earpiece for placement in the ear canal, and a dome, are disclosed. The earpiece comprises a speaker unit comprising: a receiver extending along an axis between an outlet surface perpendicular to the axis and a bottom surface perpendicular to the axis, a receiver outlet directed towards the ear canal of the user when the earpiece is mounted in the ear canal, a microphone having an inlet surface and a bottom surface, wherein the microphone is placed in connection with the receiver, a microphone inlet directed towards the ear canal of the user when the earpiece is mounted in the ear canal, wherein the receiver outlet is placed side by side with the microphone inlet, and wherein the microphone inlet and receiver outlet are separated by a wall, the earpiece further comprising a dome for placement on the speaker unit, the dome comprising: a speaker unit interface connecting a tip of the speaker unit to the dome such that when connected, the microphone inlet and receiver outlet are separated all the way into the ear canal, and an outer dome portion, wherein the dome comprises a two-component material in which the interface comprises a harder material, and the outer dome portion comprises a softer material.