Earphone Port Micro-Perforations for Consistent Acoustic Resistance
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Solution Overview
Problem
Earphones using mesh materials for acoustic resistance in ports face increased production costs and performance variability due to post-molding operations, leading to inconsistent acoustic performance.
Innovation Solution
Integrally forming a series of micro-perforations (through-holes) during injection molding of the earphone's port structure, eliminating the need for post-molding operations and enhancing assembly efficiency while maintaining acoustic resistance and environmental protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mesh materials are used for acoustic resistance in ports, then acoustic performance can be tuned, but production costs increase and performance becomes variable due to post-molding operations
Solution Approach 1:
The port structure is pre-formed with integrated acoustic resistance features during the initial molding process, eliminating the need for subsequent post-molding operations. This preliminary action ensures consistent acoustic performance while simplifying manufacturing by combining multiple steps into a single integrated process.
Solution Approach 2:
The acoustic resistance function and port structure are merged into a single integrated component. Instead of using separate mesh materials applied later, the acoustic resistance is built into the port structure itself, reducing assembly steps and improving manufacturing efficiency.
2Productivity
If mesh materials are applied post-molding, then acoustic resistance is achieved, but production time increases and assembly efficiency decreases
Solution Approach 1:
The acoustic resistance features are created during the initial molding process rather than being added later. This preliminary action eliminates post-molding operations, reducing production cycle time and improving assembly efficiency by combining multiple steps into one integrated manufacturing process.
3Manufacturing precision
If mesh materials are used for port coverage, then environmental protection is provided, but manufacturing precision and uniformity deteriorate due to post-molding operations
Solution Approach 1:
The port structure with acoustic resistance features is formed during the initial molding process, ensuring uniformity and precision before any assembly operations. This eliminates the variability introduced by post-molding material application and ensures consistent acoustic performance across all units.
Solution Approach 2:
The environmental protection function and acoustic resistance are merged into the integrated port structure. This unified approach ensures uniform manufacturing precision while maintaining manufacturing simplicity, as the features are created in a single molding process rather than through multiple separate operations.
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 approach simplifies earphone production, reduces variability, and ensures consistent performance by directly forming acoustically resistive elements within the earphone's structure, improving both acoustic and environmental protection.
Implementation Method 1
an electro-acoustic transducer configured to deliver acoustic energy into the first acoustic cavity
Implementation Method 2
The port may comprise an acoustically resistive element
Data Source
AI summary
An earphone with a first acoustic cavity, an electro-acoustic transducer configured to deliver acoustic energy into the first acoustic cavity, and a port that acoustically couples the first acoustic cavity to a different volume, wherein the port comprises a series of through-holes that are open to the first acoustic cavity and the different volume.