Microspeaker Acoustical Resistance Assembly Venting
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Solution Overview
Problem
Modern in-ear headphones face challenges in achieving a wide range of frequency responses without complex design modifications, as existing acoustical resistance assemblies require changes to both the back plate and printed circuit board to tailor the frequency response, limiting flexibility and increasing design complexity.
Innovation Solution
The use of strategically designed vent holes in the back plate and printed circuit board, along with a scrim material, allows for flexible venting and acoustical resistance adjustment, enabling a wide range of frequency responses by modifying only the PCB geometry while maintaining the back plate configuration, thus decoupling back plate and PCB venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both back plate and printed circuit board are modified to tailor frequency response, then frequency response customization is improved, but design complexity increases
Solution Approach 1:
The patent divides the acoustical resistance assembly into functionally independent segments: the back plate with first vent holes and the printed circuit board with second vent holes. This segmentation allows each component to be optimized and modified independently for frequency response customization without requiring changes to the entire assembly, thereby reducing design complexity while maintaining adaptability.
Solution Approach 2:
The patent applies local quality by creating distinct vent hole configurations in specific locations of the back plate and PCB. The first vent holes in the back plate and second vent holes in the PCB have different geometries and arrangements tailored to specific frequency ranges, allowing localized optimization of acoustic properties without redesigning the entire structure.
2Stability of the object's composition
If back plate and PCB venting are coupled, then structural integration is improved, but flexibility in frequency response design decreases
Solution Approach 1:
The patent segments the venting function into two independent systems: first vent holes in the back plate and second vent holes in the PCB. These segmented venting paths allow independent optimization of each component's acoustic characteristics, providing flexibility in frequency response design while maintaining structural integration through the unified transducer housing.
Solution Approach 2:
The patent introduces an intermediary acoustical resistance assembly between the back plate and PCB that mediates the interaction between the two venting systems. This intermediary structure allows each venting system to function independently while still contributing to the overall acoustic performance, thereby maintaining both structural integration and design flexibility.
3Adaptability or versatility
If complex design modifications are made to achieve wide frequency responses, then frequency range coverage is improved, but manufacturing ease decreases
Solution Approach 1:
The patent segments the frequency response control into independent modular components with standardized interfaces. The back plate and PCB can be manufactured separately using standard processes, then assembled into the transducer assembly. This segmentation enables frequency range coverage to be achieved through simple geometric modifications of individual components rather than complex integrated designs, significantly improving manufacturing ease.
Solution Approach 2:
The patent achieves wide frequency range coverage by changing geometric parameters (hole diameter, hole pattern, vent configuration) of the segmented components rather than modifying the fundamental structure. These parameter changes can be implemented through standard manufacturing processes without requiring complex tooling or assembly procedures, thereby maintaining ease of manufacture while expanding frequency capabilities.
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 allows for a flexible and simplified design that achieves a wide range of frequency responses, reducing design complexity and enabling the microspeaker to produce sufficient sound pressure across the entire frequency range without altering the back plate geometry, enhancing the transducer's performance and manufacturing ease.
Implementation Method 1
The at least one first vent hole and the at least one second vent hole may be constructed and arranged to provide an acoustical resistance of air flowing between an external environment and an interior of the transducer, and for shaping a frequency response for the electro-acoustic transducer
Data Source
AI summary
An electro-acoustic transducer is provided that comprises a diaphragm and a magnet assembly comprising a magnet and a back plate. The back plate comprises at least one first vent. The diaphragm generates sound during a movement of the diaphragm relative to the back plate. The transducer further comprises a printed circuit board comprising at least one second vent and a cavity between the printed circuit board and the back plate that separates the at least one first vent from the at least one second vent.