Miniature Loudspeaker Sound Hole Relocation for Magnetic Integrity
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Solution Overview
Problem
Conventional micro loudspeaker designs face performance damage due to blank pressing or trepanning processes affecting the magnetic circuit and risk of sound hole blockage during assembly, which impacts magnetic induction and installation test curves.
Innovation Solution
The micro loudspeaker redesigns the sound hole position to be symmetrically located on the upright edges of the yoke's minor axis side portions, maintaining magnetic induction and preventing blockage by using avoidance structures in the housing, ensuring magnetic properties and assembly integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sound hole is provided on the bottom plane of the product, then the assembly with terminal is simplified, but the sound hole is easy to be blocked during overall machine assembly, affecting the installation test curve
Solution Approach 1:
The sound hole is relocated from the bottom plane (horizontal dimension) to the side surface of the yoke (vertical dimension), changing the spatial dimension of sound hole placement. This dimensional transition allows the sound hole to be positioned at the upright edge of the minor axis side portion of the yoke, where it cannot be blocked during assembly while maintaining acoustic functionality
2Ease of manufacture
If the yoke is performed with blank pressing or trepanning process to make room for dust screen, then the sound hole can be covered, but the magnetic conductive process is affected, resulting in damage to product performance
Solution Approach 1:
The dust screen function is extracted from the yoke structure and integrated into the housing instead. The housing is designed with an opening at the bottom plane that corresponds to the sound hole position, and the dust screen is installed on the housing rather than requiring modifications to the yoke. This extraction eliminates the need for blank pressing or trepanning of the yoke, preserving the magnetic circuit integrity while still providing dust protection
3Device complexity
If the sound hole is provided on the bottom plane, then the structure is simple, but the magnetic induction lines are depleted, affecting magnetic properties
Solution Approach 1:
The sound hole is positioned on the side surface of the yoke at the upright edge of the minor axis side portion, utilizing the vertical dimension rather than the horizontal bottom plane. This spatial repositioning allows the sound hole to be located in a region that does not interfere with the magnetic induction lines passing through the yoke, thereby maintaining magnetic properties while providing acoustic output
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 design minimizes magnetic induction loss and prevents sound hole blockage during assembly, maintaining product performance and installation test curves.
Implementation Method 1
a magnetic circuit system, a vibration system and a support system, wherein the magnetic circuit system comprises a yoke, a magnet accommodated in the yoke and a washer fixed to a surface of the magnet, the vibration system comprises a voice coil and a diaphragm
Data Source
AI summary
A loudspeaker module emitting sound at a lateral side comprises a loudspeaker unit and a module housing comprising a lower module housing, a middle module housing and an upper module housing. A space formed by the loudspeaker unit, the middle module housing and the lower module housing is a rear sound cavity. A space formed by the loudspeaker unit, the middle module housing and the upper module housing is a front sound cavity. The loudspeaker module further comprises a cover plate which forms a cavity together with the upper module housing. The cavity is communicated with the rear sound cavity through a conducting hole. By utilizing the loudspeaker module of the present invention, superfluous space of the upper module housing can be converted into the rear sound cavity, and therefore the size of the rear sound cavity is increased, and the acoustic performance of the loudspeaker module is improved.