Dual Magnetic Circuits Structure for Thin Speaker Design
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Solution Overview
Problem
The existing dual magnetic circuits structure for speakers is too thick, making it unsuitable for applications with strict thickness requirements, as it cannot be reduced without compromising vibration spaces and winding heights.
Innovation Solution
A dual magnetic circuits structure with a shell and inner magnetic assembly, where the inner magnetic elements are stacked and the voice coils are positioned in staggered magnetic gaps, allowing for a reduced thickness while maintaining vibration paths and winding heights, achieved by using a shell made of magnetically permeable materials and auxiliary magnets for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the existing opposite vertex dual magnetic circuits structure is used, then the speaker can reduce consumables and cost while ensuring the same loudness, but the speaker becomes relatively thick and is no longer applicable in scenarios with strict thickness requirements
Solution Approach 1:
The patent transitions from a traditional planar arrangement to a three-dimensional stacked configuration where the first and second magnetic circuits are vertically superimposed. The first voice coil is arranged in the first magnetic gap, and the second voice coil is arranged in the second magnetic gap, with their vibration paths staggered in the vertical dimension. This spatial reorganization reduces the horizontal footprint and allows for a thinner overall structure while maintaining dual magnetic circuit functionality and material sharing.
2Adaptability or versatility
If the existing opposite vertex dual magnetic circuits structure is used, then partial materials are shared, but the speaker thickness increases making it unsuitable for strict thickness requirements
Solution Approach 1:
The patent implements a nested configuration where the first and second magnetic circuits are stacked vertically, with the first inner magnetic element and second inner magnetic element positioned at different heights. The shell encloses both magnetic circuits, creating a compact integrated structure. This nesting approach allows material sharing between the two magnetic circuits while minimizing the overall thickness of the speaker assembly.
3Length of stationary object
If the vibration paths of the first voice coil and second voice coil are staggered, then the thickness is reduced, but the magnetic flux density may be compromised
Solution Approach 1:
The patent employs auxiliary magnets positioned adjacent to the first and second voice coils to locally enhance the magnetic flux density in the respective magnetic gaps. The first auxiliary magnet is disposed near the first voice coil, and the second auxiliary magnet is disposed near the second voice coil. This localized reinforcement ensures that each voice coil operates in a high magnetic flux density environment despite the staggered vertical arrangement, thereby maintaining driving force while achieving reduced thickness.
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
The proposed dual magnetic circuits structure effectively reduces the overall thickness by 19% while maintaining the vibration spaces and winding heights, and improves the magnetic flux density by 6%, addressing the thickness limitation of existing designs.
Implementation Method 1
the shell is made of a magnetically permeable material
Implementation Method 2
a first magnetic gap configured for disposing a first voice coil and a part of a second voice coil is formed in a gap between a circumference of the first inner magnetic element and the shell
Data Source
AI summary
The present disclosure provides a dual magnetic circuits structure and a sound device, the dual magnetic circuits structure includes a shell and an inner magnetic assembly, the shell is made of a magnetically permeable material, the inner magnetic assembly is arranged in the shell and includes a first inner magnetic element and a second inner magnetic element, a first magnetic gap, a second magnetic gap, an outer diameter of the second inner magnetic element is greater than that of the first inner magnetic element. Therefore, compared to the existing dual magnetic circuits structure, the dual magnetic circuits structure provided by the present invention has the advantage that the thickness of the whole dual magnetic path structure can be effectively reduced while ensuring that the vibration spaces and winding heights of the first voice coil and the second voice coil are not changed.