In-Ear Earphone Nozzle Microphone Embedding for Airflow
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Solution Overview
Problem
In-ear active noise reduction (ANR) earphones face a challenge in maintaining audio quality due to the feedback microphone restricting airflow through the nozzle, which is exacerbated by the need for a compact design.
Innovation Solution
The feedback microphone is fully or partially embedded in the nozzle wall, maintaining maximum airflow while a metal sleeve provides the necessary rigidity to the nozzle, allowing for a thinner plastic structure and improved sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feedback microphone is placed in the acoustic volume of the earphone, then active noise reduction function is achieved, but the open space for airflow is restricted which deteriorates audio quality
Solution Approach 1:
The feedback microphone is embedded within the nozzle wall structure, nesting the microphone inside the nozzle rather than placing it in the acoustic volume. This allows the microphone to be integrated into the existing structure without occupying additional space that would restrict airflow through the nozzle.
Solution Approach 2:
The microphone is positioned in a different spatial dimension by embedding it in the nozzle wall rather than placing it in the central acoustic volume. This dimensional relocation allows the microphone to function without blocking the airflow path through the nozzle.
2Length of moving object
If the nozzle is made thinner to improve comfort and aesthetics, then ease of wear and appearance are improved, but rigidity is reduced which can affect performance
Solution Approach 1:
The nozzle is constructed as a composite structure combining plastic and metal materials. The plastic portion provides the thin, comfortable form factor while the metal sleeve embedded in the nozzle wall provides the necessary rigidity and structural support, allowing the nozzle to be both thin and rigid simultaneously.
Solution Approach 2:
The metal sleeve is strategically positioned in specific locations within the nozzle wall where rigidity is most needed, rather than making the entire nozzle thick. This localized reinforcement provides structural support only where required, maintaining thin overall dimensions while ensuring adequate rigidity.
Data Source
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AI summary
An active noise reduction (ANR) earphone with a housing comprising a front cavity and an exit that is fluidly coupled to the front cavity. An acoustic driver is configured to deliver acoustic energy into the front cavity of the housing. A nozzle is coupled to the housing and is configured to direct acoustic energy from the housing exit to a nozzle exit opening. A microphone is located in the nozzle. A compliant sealing structure is coupled to the nozzle and is configured to couple the earphone to an ear of a user.