Receiver Nozzle Microphone Layout to Resist Ear Wax Blockage

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Solution Overview

Problem

Existing receiver/microphone arrangements in hearing devices are vulnerable to ear wax and moisture due to the microphone's proximity to the ear drum, leading to potential damage and blockage issues.

Innovation Solution

The microphone unit is positioned within a nozzle mount with its sound inlet oriented towards the interior, protected by a wax protection member, and the receiver and microphone are arranged in a symmetrical, elongated structure to minimize exposure to ear wax and moisture, with sound channels guiding sound waves effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the microphone is positioned close to the ear drum in an in line arrangement, then the sound pressure level detection accuracy is improved, but the microphone becomes vulnerable to ear wax blockage and moisture damage

Engineering Contradiction:

Improvesound pressure level detection accuracyVSAvoidmicrophone protection against ear wax and moisture

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The microphone is repositioned from an in-line arrangement (axial dimension) to a transverse arrangement (lateral dimension) relative to the receiver. The sound inlet of the microphone faces laterally towards the receiver unit outlet opening, placing it in a different spatial dimension that avoids direct exposure to the ear canal environment while maintaining acoustic coupling through the sound channel.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The receiver unit outlet opening serves as an intermediary element between the ear canal and the microphone sound inlet. Sound pressure waves are transmitted through this intermediary structure, allowing the microphone to detect acoustic signals without direct exposure to contaminants in the ear canal.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the microphone sound inlet faces the ear drum, then the microphone can detect sound pressure waves effectively, but ear wax can block the sound inlet opening

Engineering Contradiction:

Improvesound pressure wave detectionVSAvoidear wax blockage

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

Instead of orienting the microphone sound inlet towards the ear drum (forward-facing), the sound inlet is oriented towards the receiver unit outlet opening (backward-facing or laterally-facing). This inverted orientation allows the receiver unit structure itself to protect the microphone sound inlet from ear wax blockage while maintaining acoustic functionality.

Inventive Principle:

Principle #13The other way round (Inversion)

3Device complexity

If the microphone is positioned in an in line arrangement with the receiver, then the overall structure is compact, but the fit rate of the acoustical assembly is reduced

Engineering Contradiction:

Improvestructural compactnessVSAvoidfit rate

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The acoustical assembly transitions from a symmetric in-line arrangement to an asymmetric transverse arrangement. The microphone is positioned laterally offset from the receiver unit axis, creating an asymmetric configuration that improves the overall fit rate and comfort in the ear canal while maintaining compact dimensions through optimized spatial distribution of components.

Inventive Principle:

Principle #4Asymmetry

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

This configuration enhances the fit rate and longevity of the microphone by preventing blockage and damage, while maintaining acoustic performance and ease of manufacturing.

Implementation Method 1

the nozzle comprises at least one sound channel adapted to guide generated sound pressure waves from a receiver unit outlet opening to at least one sound outlet opening of the nozzle

Methodology Applied

Scientific EffectSound wave propagation: Sound

Data Source

PatentUS20260046547A1Microphone unit arranged on top of receiver unit nozzle

Publication Date: 2026.02.12 SONION NEDERLAND BV

AI summary

An acoustical assembly, adapted to be inserted into an ear canal, comprises a receiver unit adapted to generate sound pressure waves, a microphone unit adapted to detect sound pressure waves inside the ear canal when the acoustical assembly is inserted in the ear canal, and a nozzle having a longitudinal centre axis and including a receiver unit mount adapted to house at least part of the receiver unit. The nozzle includes at least one sound channel adapted to guide generated sound pressure waves from a receiver unit outlet opening to at least one sound outlet opening of the nozzle. The nozzle further includes a microphone unit mount adapted to house at least part of the microphone unit. The microphone unit is arranged in the microphone unit mount in such a way that a sound inlet opening of the microphone unit is oriented substantially perpendicular to the longitudinal central axis.