Speaker Magnet Circuit Pole Plate Bending Design
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Solution Overview
Problem
Conventional speakers in portable devices face issues with non-uniform magnet field distribution and poor BL symmetry due to height limitations, leading to reduced performance and harmonic distortion.
Innovation Solution
The speaker design incorporates a magnet circuit system with a main magnet and sub magnets, featuring a rounded rectangle shape with a bending portion and recessed portion, and a vibration system with a diaphragm and voice coil, where the magnet flux is enhanced by a uniform magnet field distribution, improving magnet induction efficiency and reducing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the main magnet is raised to increase height, then magnet induction efficiency improves, but the peripheral sub magnet cannot increase height synchronously due to total height limitation, leading to non-uniform magnet field distribution
Solution Approach 1:
The pole plate is designed with a bending portion that curves upward, matching the rounded rectangle shape of the main magnet. This curvature allows the pole plate to follow the elevated contour of the main magnet, maintaining uniform magnet field distribution across the entire magnet circuit system including both the main magnet and peripheral sub magnets.
Solution Approach 2:
The pole plate features different geometries in different regions: a bending portion that curves upward to match the main magnet's elevated shape, and a flat portion that remains level for the peripheral sub magnets. This local differentiation allows each region to optimize its interaction with the corresponding magnet type, achieving both high magnet induction efficiency and uniform field distribution.
2Ease of manufacture
If the pole plate is designed as a flat plate, then manufacturing is simple, but the BL symmetry is poor due to height limitations
Solution Approach 1:
The pole plate incorporates a bending portion with a rounded rectangle shape that corresponds to the main magnet's geometry. This curved design improves BL symmetry by ensuring uniform magnetic flux distribution, while the overall structure remains manufacturable using standard bending and forming processes.
Solution Approach 2:
The pole plate is divided into distinct functional regions: a bending portion for the main magnet area and a flat portion for the peripheral sub magnet area. This segmentation allows each region to be optimized for its specific function while maintaining manufacturing feasibility through modular construction.
3Length of stationary object
If the total height of the speaker is limited, then the device remains compact and portable, but the magnet field distribution becomes non-uniform
Solution Approach 1:
Instead of increasing height in the vertical dimension, the pole plate utilizes horizontal dimensionality with its bending portion that extends outward to match the main magnet's rounded rectangle shape. This dimensional approach maintains compact overall height while achieving uniform magnet field distribution through lateral geometry optimization.
Solution Approach 2:
The pole plate features localized geometric variations where the bending portion adapts to the main magnet's shape in specific regions, while other regions remain flat. This local quality differentiation enables uniform magnet field distribution throughout the compact speaker structure without requiring increased overall height.
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 magnet induction efficiency, reduces harmonic distortion, and improves the overall performance and symmetry of the speaker, leading to better sound quality and product competitiveness.
Implementation Method 1
a vibration system with a diaphragm and voice coil, where the magnet flux is enhanced by a uniform magnet field distribution, improving magnet induction efficiency
Implementation Method 2
a magnet circuit system with a main magnet and sub magnets, featuring a rounded rectangle shape with a bending portion and recessed portion
Data Source
AI summary
The speaker of the present disclosure comprises a frame having a receiving space, a vibration system and a magnet circuit system received in the frame. The magnet circuit system comprises a lower magnetic plate, a magnet attached on the lower magnetic plate and a pole plate attached on the magnet, wherein the pole plate comprises a main body portion and a bending portion bend along a direction from an edge of the main body portion toward the lower magnetic plate, the surface of the magnet attached to the main body portion is recessed to form a recessed portion, and the bending portion is received in the recessed portion. Compared with the related art, the speaker of the present disclosure improves the performance and the competitiveness of the product.