Speaker Magnetic Circuit with Segmented Magnet Groups
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Solution Overview
Problem
Existing speakers face challenges with reduced low-frequency performance due to thin designs, leading to increased magnetic flux leakage and uncontrolled vibration amplitude, which can damage the diaphragm and affect sound quality.
Innovation Solution
A speaker design featuring a magnetic circuit system with three magnet groups aligned along a vibration direction, including a second magnet group that separates the first and third magnet groups to enhance magnetic flux density and reduce leakage, allowing for controlled vibration amplitude and increased diaphragm movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the speaker is made thinner to reduce device thickness, then the overall device size is reduced, but the vibration amplitude of the diaphragm is reduced, affecting low frequency performance
Solution Approach 1:
The magnetic circuit system is divided into three separate magnet groups (first, second, and third magnet groups) arranged along the vibration direction. This segmentation allows the magnetic flux to be distributed more effectively across the voice coil, enabling sufficient vibration amplitude even in a thin speaker structure.
Solution Approach 2:
The magnets are arranged in a linear sequence along the vibration direction (X-X axis) rather than in a traditional circular or planar arrangement. This dimensional arrangement maximizes the magnetic flux path length within the limited thickness, improving low frequency performance without increasing overall speaker thickness.
2Strength
If two pairs of magnets are used in a long stroke speaker to improve low frequency performance, then the vibration amplitude is improved, but the magnetic flux leakage increases and voice coil vibration becomes uncontrolled
Solution Approach 1:
The second magnet group acts as an intermediary element between the first and third magnet groups. It is specifically positioned to generate magnetic flux that counteracts and compensates for the leakage flux from the outer magnet groups, thereby controlling the overall magnetic flux distribution and preventing excessive leakage while maintaining high vibration amplitude.
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 configuration improves low-frequency sound quality by allowing larger vibration amplitudes while controlling voice coil vibrations, enhancing the overall performance of the speaker.
Implementation Method 1
a voice coil 101 which drives the vibrating diaphragm 100 to vibrate... One end of the voice coil 101 is suspended in the magnetic gap 18
Implementation Method 2
The magnetic circuit system 11 includes a first magnet group 15, a second magnet group 16 and a third magnet group 17... the magnetic flux leakage in the magnetic circuit system of the long stroke speaker is serious
Data Source
AI summary
A speaker includes a vibration system including a vibrating diaphragm and a flat voice coil for driving the vibrating diaphragm; a magnetic circuit system including a first magnet group, a second magnet group and a third magnet group, lined up in turn along the vibration direction of the vibration system; and a housing for accommodating the vibrational system and the magnetic circuit system. The first magnet group includes a first magnet and the second magnet with opposite magnetic poles thereof faced each other. The second magnet group includes a third magnet and a fourth magnet with N-pole of the third magnet close to S-pole of the fourth magnet. The third magnet group includes a fifth magnet and a sixth magnet with opposite magnetic poles thereof faced each other.