Moving Coil Speaker Annular Rib Frame Design
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Solution Overview
Problem
Conventional moving-coil speakers have a thick and heavy structure that limits the vibration stroke of the voice coil, resulting in reduced space for vibration and increased manufacturing costs.
Innovation Solution
The design includes a frame with a magnetic circuit system setting section featuring a first and second region, where the voice coil is spaced apart from the frame, allowing for increased stroke space, reduced thickness, and weight, and improved magnetic field concentration by positioning the voice coil closer to the magnet, with a circuit board either inside or outside a groove on the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional frame structure is used to dispose voice coils, magnets, and circuit boards, then the structural strength and component stability are improved, but the overall structure becomes thicker and heavier, and the space for voice coil vibration is reduced
Solution Approach 1:
The patent transitions from a conventional planar arrangement to a three-dimensional spatial configuration by suspending the voice coil in the air gap between magnet arrays. The circuit board is positioned on the rear surface of the frame, utilizing the depth dimension. This dimensional reorganization reduces the front-to-back thickness while maintaining component stability through strategic spatial positioning rather than dense planar packing.
Solution Approach 2:
The patent embeds multiple components within the frame's internal volume in a nested arrangement. The magnet arrays are positioned on opposite sides of the air gap, with the voice coil suspended between them. The circuit board is integrated into the rear structure, potentially within grooves or recesses. This nested configuration maximizes component density without increasing the overall front-to-back thickness.
2Reliability
If a conventional frame structure is used to dispose voice coils, magnets, and circuit boards, then the structural strength and component stability are improved, but the weight and manufacturing cost increase
Solution Approach 1:
The patent extracts the voice coil from the conventional enclosed frame structure and suspends it in the air gap between magnet arrays. This extraction eliminates the need for heavy internal mounting structures and allows the voice coil to move freely during vibration. The circuit board is also repositioned to the rear surface, removing it from the central mass and reducing overall weight while maintaining electrical connectivity.
Solution Approach 2:
The patent employs thin-film magnet arrays positioned on opposite sides of the air gap, creating a lightweight magnetic circuit system. The frame structure itself is designed with thin walls and optimized geometry, using minimal material while maintaining structural integrity. This thin-film approach significantly reduces weight compared to conventional bulky magnetic assemblies and frame structures.
3Ease of manufacture
If a conventional frame structure is used, then component assembly is simplified, but the space for voice coil vibration stroke is limited
Solution Approach 1:
The patent creates a dynamic suspension system where the voice coil is held in position by magnetic forces between the magnet arrays rather than rigid mechanical constraints. This dynamic positioning allows the voice coil to achieve maximum vibration stroke in all directions. The magnetic field configuration provides restoring forces that guide the voice coil's movement, enabling large amplitude vibrations while maintaining controlled operation.
Solution Approach 2:
The patent divides the magnetic circuit into separate magnet arrays positioned on opposite sides of the air gap. This segmentation creates a distributed magnetic field that provides uniform support and restoring forces across the voice coil's vibration range. The segmented structure also allows independent optimization of each magnet array's position and strength, maximizing the available vibration stroke while maintaining assembly simplicity through modular construction.
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 reduces the overall structural thickness and weight, lowers manufacturing costs, and enhances acoustic performance by increasing the voice coil's vibration space and sensitivity.
Implementation Method 1
The movement of the voice coil under the action of the electromagnetic force causes the diaphragm to vibrate, thereby producing sound.
Data Source
AI summary
A moving-coil speaker includes a frame, magnetic circuit system setting section, and magnetic circuit system. The frame has a first surface. The magnetic circuit system setting section is formed on the first surface and includes a first region and a second region surrounding the first region. The magnetic circuit system is disposed at the magnetic circuit system setting section and includes at least one voice coil which spaced from the first surface of the frame and having a first end and a second end opposite to the first end. The first end defines a virtual plane extending along a radial direction of the voice coil. The virtual plane and the first surface of the first region define a first distance. The virtual plane and the first surface of the second region define a second distance. The second distance is greater than the first distance, and the second distance and the first distance are parallel.