Linear-Array Speaker Magnetic Circuits for Air Exhaust
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Solution Overview
Problem
Speakers in electronic devices face challenges with low Q factor and poor air exhaust due to single or five magnetic circuit system designs, affecting sound quality and efficiency.
Innovation Solution
A speaker design featuring a diaphragm assembly with a voice coil between a central and side magnet, utilizing a five magnetic circuit system with vent grooves between adjacent magnets and a linear array of magnetic circuit assemblies to improve air exhaust efficiency and Q factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a five magnetic circuit system design is used, then the magnetic field strength is improved, but air exhaust becomes poor and acoustic resistance increases
Solution Approach 1:
The magnetic circuit assembly is divided into multiple independent magnetic circuit assemblies arranged in a linear array. Each assembly has its own magnets and voice coil, allowing independent air exhaust paths that reduce mutual interference and lower overall acoustic resistance while maintaining strong magnetic field generation.
Solution Approach 2:
The magnetic circuit assemblies are arranged in a linear array extending along the length direction of the speaker, utilizing the longitudinal dimension to distribute multiple magnetic circuits. This spatial arrangement allows air to exhaust from multiple directions simultaneously through vent grooves between adjacent assemblies, improving air exhaust efficiency without compromising magnetic field strength.
2Productivity
If multiple magnetic circuit assemblies are arranged in a linear array, then air exhaust efficiency is improved, but device complexity increases
Solution Approach 1:
Adjacent magnetic circuit assemblies share common vent grooves and magnetic circuit components, reducing the total number of separate parts. The linear array configuration allows multiple assemblies to be integrated into a compact structure with shared air exhaust paths, improving air exhaust efficiency while controlling manufacturing complexity.
3Weight of moving object
If the speaker uses a thin and lightweight design, then suitability for portable devices is improved, but speaker effect is compromised
Solution Approach 1:
The speaker uses a thin diaphragm assembly with localized magnetic circuit assemblies positioned strategically to maximize sound radiation efficiency. The linear array of magnetic circuits provides distributed magnetic field generation that maintains strong speaker effect while keeping overall thickness and weight minimal, suitable for portable electronic devices.
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
Enhances air exhaust efficiency, increases Q factor, and improves sound quality while maintaining a thin and lightweight form, suitable for devices like tablets and large-screen televisions.
Implementation Method 1
After the voice coil is powered on, a current is generated in the voice coil, and therefore a magnetic field is generated. The voice coil moves under a force in the magnetic field generated by a central magnet and a side magnet.
Implementation Method 2
The voice coil moves under a force in the magnetic field generated by a central magnet and a side magnet. When the current in the voice coil changes, the magnetic field generated by the voice coil also changes.
Implementation Method 3
There is a gap between two adjacent side magnets to form the vent groove for air exhaust, and the rectangle enclosed by the side magnets includes four gaps, so that an overall area of the vent groove is increased, and air can be exhausted from a plurality of directions at the same time.
Data Source
AI summary
A speaker includes a diaphragm assembly and a magnetic circuit assembly. The magnetic circuit assembly can provide a magnetic field to enable the diaphragm assembly to vibrate and emit a sound. The magnetic circuit assembly includes a first magnet and a second magnet. The diaphragm assembly includes a voice coil. The first magnet is disposed around the second magnet. The voice coil is disposed between the first magnet and the second magnet. The speaker includes a plurality of magnetic circuit assemblies. Two adjacent magnetic circuit assemblies share a same first magnet, and there is a gap between adjacent first magnets, to form a vent groove.