Speaker Yoke Extension Wall and Air-Permeable Mesh for Magnetic Leakage Reduction
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Solution Overview
Problem
Conventional speakers suffer from magnetic leakage and restricted low-frequency performance due to the placement of the second magnet and the use of sound-absorbing powders, which limits the acoustic and magnetic efficiency.
Innovation Solution
A speaker design featuring a yoke with a through hole and an extension wall, where the second magnet is positioned on opposite sides of the first magnet, and an air-permeable mesh covers the hole to reduce magnetic leakage and prevent sound-absorbing powders from entering the speaker, allowing for improved magnetic and acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the second magnet is arranged at two opposite sides of the first magnet, then the magnetic circuit system can be more compact, but magnetic leakage occurs at the sides where the elastic supporting member is located
Solution Approach 1:
An air-permeable mesh is introduced as an intermediary component between the second magnet and the elastic supporting member. The mesh serves as a magnetic shield that guides magnetic field lines through its permeable structure, preventing magnetic leakage while allowing acoustic waves to pass through freely. This mediator resolves the conflict between compact magnet arrangement and magnetic leakage prevention.
Solution Approach 2:
The air-permeable mesh utilizes porous material properties to achieve dual functionality: it blocks magnetic leakage paths while maintaining acoustic transparency. The porous structure allows sound waves to pass through while providing a continuous magnetic shielding effect, solving the contradiction between compact design and magnetic field containment.
2Reliability
If an air-permeable mesh is used to separate part of the acoustic back cavity, then sound-absorbing powders are prevented from entering the speaker, but the entire volume of the acoustic back cavity cannot be utilized for filling sound-absorbing powders
Solution Approach 1:
The air-permeable mesh is extracted and repositioned to the outer periphery of the magnetic circuit system, specifically covering the through-holes in the yoke. This extraction removes the mesh from the interior acoustic back cavity space, eliminating the restriction on powder filling volume while maintaining its protective function at the boundary where powder intrusion is most likely to occur.
Solution Approach 2:
The protective function is shifted from a horizontal partition (separating cavity volumes) to a peripheral barrier (covering through-holes at the yoke). This dimensional repositioning allows the mesh to protect against powder intrusion at the critical interface while leaving the entire acoustic back cavity volume available for sound-absorbing material filling.
3Device complexity
If the elastic supporting member is arranged close to the magnetic circuit system, then the speaker structure is more compact, but magnetic leakage occurs at the sides where the supporting member occupies space
Solution Approach 1:
The air-permeable mesh acts as a magnetic intermediary placed between the second magnet and the elastic supporting member. It provides a continuous magnetic shielding path that prevents leakage to the supporting member while maintaining the compact arrangement where the supporting member remains close to the magnetic circuit system for structural efficiency.
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
The design enhances magnetic permeability, reduces magnetic leakage, and utilizes the entire acoustic back cavity for sound-absorbing materials, resulting in improved acoustic and low-frequency performance.
Implementation Method 1
The extension wall increases the magnetic permeability and reduces the magnetic leakage at the another two opposite sides of the first magnet for improving magnetic performances of the magnetic circuit system
Implementation Method 2
the air-permeable mesh attached to the yoke covers the through hole for prevent sound-absorbing powders from entering the inside of the speaker
Implementation Method 3
a vibration system including an upper diaphragm, an elastic supporting member locating at a side of the upper diaphragm close to the magnetic circuit system and spaced apart from the upper diaphragm, a skeleton for connecting the upper diaphragm and the elastic supporting member, and a voice coil fixed to the skeleton
Data Source
AI summary
The present disclosure discloses a speaker including a frame with two open ends, a vibration system sealing one open end of the frame, a magnetic circuit system, and an air-permeable mesh. The magnetic circuit system includes a yoke sealing another open end of the frame, a first magnet, a second magnet arranged at two opposite sides of the first magnet, a through hole penetrating the yoke and arranged at another two opposite sides of the first magnet, and an extension wall bending and extending from a side of the through hole close to the first magnet in a direction close to the vibration system. The air-permeable mesh is attached to the yoke and covers the through hole. Compared with the related art, the speaker disclosed by the present disclosure has a better acoustic performance.