Miniature Speaker Magnetic Bridge Assembly Stability
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Solution Overview
Problem
Existing miniature speakers in portable devices face reliability issues due to the repulsion force between magnets, leading to detachment and compromised performance.
Innovation Solution
A miniature speaker design featuring a frame with a hollow rectangular case, a vibration system with a diaphragm and voice coil, and a magnetic circuit system with auxiliary magnets and a gasket to enhance magnetic performance and assembly reliability, where the gasket is magnetized to match the second magnet, improving the magnetic gap and assembly stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two main magnets are welded and connected through glue or laser spot welding, then the manufacturing process is simple, but the magnets are easy to be detached due to repulsion force
Solution Approach 1:
A magnetic bridge is introduced as an intermediary component between the first and second main magnets. This magnetic bridge serves as a mediator that physically connects the two repelling magnets while maintaining magnetic flux continuity, thereby resolving the detachment issue caused by repulsion force without complicating the manufacturing process
Solution Approach 2:
The magnetic bridge provides counteracting magnetic attraction force to balance the repulsion force between the two main magnets with same magnetic poles. By positioning the magnetic bridge between the repelling magnets, it creates an opposing magnetic force that prevents magnet detachment while maintaining the simple welding connection method
2Manufacturing precision
If the magnetic circuit system uses two main magnets with same magnetic poles facing each other, then the magnetic field distribution is optimized, but the repulsion force causes assembly instability
Solution Approach 1:
The magnetic bridge acts as a stable intermediary structure that enables the magnetic circuit system to maintain both the optimized magnetic field distribution (with same-pole magnets facing each other) and assembly stability. It provides a fixed connection point that prevents displacement while allowing the magnetic field configuration to remain intact
3Volume of moving object
If the speaker is designed as a miniature size for portable devices, then the portability is improved, but the assembly reliability deteriorates due to smaller components
Solution Approach 1:
In the miniature speaker design, the magnetic bridge provides counteracting magnetic force to stabilize the small-scale magnetic circuit system. This counterbalance mechanism is particularly important in miniature speakers where smaller components are more susceptible to detachment, thereby maintaining assembly reliability despite the reduced size
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 design improves the assembly reliability and magnetic performance of the miniature speaker, ensuring consistent sound quality and reducing the likelihood of magnet detachment, thereby enhancing the overall performance and durability of the device.
Implementation Method 1
a gasket (7) located between the vibration system (3) and the cover plate (6), wherein the gasket (7) is magnetized to match the second magnet (533)
Implementation Method 2
a vibration system and a magnetic circuit system fixed and connected on the frame (1)... a vibration system with a diaphragm and voice coil driving the diaphragm to sound
Data Source
AI summary
A miniature speaker includes a frame; a vibration system including a diaphragm and a voice coil driving the diaphragm. The diaphragm includes a first fixation part located on a middle position of the diaphragm, a second fixation part located on an edge of the diaphragm and connected fixedly on the frame, and a vibration part connected between the first fixation part and the second fixation part. A magnetic circuit system includes a lower plate and a magnet part on the lower plate. A cover plate includes a bottom wall, and a side wall connected with the second fixation part. A gasket is located between and abuts against the bottom wall and the first fixation part. The gasket, the first fixation part and the magnet part are sandwiched firmly between the bottom wall and the lower plate.