Notched Voice Coil Layout for Low-Distortion Speaker Sensitivity
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Solution Overview
Problem
Existing sound producing devices face challenges in reducing distortion while increasing sensitivity, which affects sound quality and volume levels.
Innovation Solution
The sound producing device incorporates a magnetic circuit system with a secondary magnet steel protruding portion and a voice coil design featuring varying numbers of wire windings to form a notch, avoiding contact with the secondary magnet steel and optimizing the magnetic gap for improved magnetic flux and reduced distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the voice coil is designed with uniform wire windings, then the magnetic field distribution is simplified, but distortion increases and sound quality deteriorates
Solution Approach 1:
The patent applies local quality by varying the number of wire windings in different regions of the voice coil. Specifically, the voice coil has a first region with a first number of windings and a second region with a second number of windings, where the winding density differs between regions. This local variation in winding structure creates a corresponding variation in the magnetic field distribution, allowing optimization of both distortion reduction and manufacturing feasibility.
2Power
If the magnetic gap is reduced to increase sensitivity, then volume levels improve, but the risk of voice coil contact with magnet steel increases causing distortion
Solution Approach 1:
The patent employs asymmetry in the voice coil design by creating an uneven winding distribution between the first and second regions. The asymmetric winding structure causes the voice coil to have different clearance characteristics relative to the magnet steel in different positions. This asymmetric design allows the magnetic gap to be optimized for sensitivity while the varying winding density creates natural clearance zones that prevent contact between the voice coil and magnet steel during operation.
3Power
If the number of wire windings is increased to improve sensitivity, then volume levels increase, but distortion increases due to non-uniform magnetic field force
Solution Approach 1:
The patent applies parameter changes by systematically varying the winding parameters (number of windings) across different regions of the voice coil. The first region has a first winding parameter and the second region has a second winding parameter, creating a gradient or stepped variation in winding density. This parameter variation allows the overall sensitivity to be enhanced through increased total windings while the local parameter differences create a magnetic field distribution that reduces distortion by compensating for non-uniformities in the magnetic circuit.
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 enhances sensitivity and reduces distortion, resulting in improved sound quality and volume levels by smoothing the BL curve and ensuring uniform magnetic field force on the voice coil.
Implementation Method 1
a voice coil inserted in the magnetic gap to drive the diaphragm to vibrate
Implementation Method 2
a magnetic circuit system including a primary magnet steel and a secondary magnet steel with a magnetic gap therebetween
Data Source
AI summary
Disclosed is a sound producing device, including a magnetic circuit system and a vibration system. The magnetic circuit system includes a primary magnet steel and a secondary magnet steel with a magnetic gap therebetween, wherein the secondary magnet steel includes a body portion and a protruding portion protruding in a direction toward the primary magnet steel from the body portion, and wherein the primary magnet steel has a primary magnetic conductive plate disposed thereon. The vibration system includes a diaphragm and an voice coil wound by wire, wherein the voice coil is inserted in the magnetic gap to drive the diaphragm to vibrate, and wherein a number of layers of wire winding at an end of the voice coil away from the diaphragm are less than that of layers of wire winding at another end of the voice coil contacting with the diaphragm, to form a notch.