Speaker Device Laser Welding Yoke Frame Reliability
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Solution Overview
Problem
Existing speaker devices face reliability issues due to deformation and inaccurate positioning of the magnetic circuit unit, primarily because the frame is made of low-strength plastic and relies on gluing for fixation, leading to instability and reduced performance.
Innovation Solution
A speaker device design featuring a metal frame with a yoke and magnet assembly where the yoke includes a ring-shaped side wall and flanges that extend towards the frame, with the second section of the flange being fixed to the frame via laser spot welding, creating a magnetic gap and ensuring accurate assembly and positioning of the magnetic circuit unit, thereby increasing the fixing area and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the frame is made of low-strength plastic, then the manufacturing cost is reduced, but the frame is easy to be deformed and the reliability is lowered
Solution Approach 1:
The patent changes the material parameter of the frame from low-strength plastic to metal material, which fundamentally alters the mechanical properties including strength, stiffness, and deformation resistance. This parameter change resolves the contradiction by maintaining low manufacturing cost through metal material selection while significantly improving the frame's ability to resist deformation and enhance overall device reliability.
2Device complexity
If the yoke and frame are fixed by gluing, then the assembly process is simplified, but the positioning accuracy is poor and the structure is unstable
Solution Approach 1:
The patent replaces the chemical bonding mechanism (gluing) with a mechanical connection mechanism (laser spot welding). This substitution eliminates the positioning inaccuracies and instability inherent in adhesive bonding, while the laser spot welding process maintains assembly simplicity by directly joining the yoke and frame through localized melting and fusion, achieving both high positioning accuracy and structural stability.
Solution Approach 2:
The patent utilizes the phase transition of metal material from solid to liquid and back to solid during laser spot welding. The laser beam locally melts the metal surfaces of the yoke and frame, and upon cooling, creates a strong metallurgical bond. This phase transition mechanism enables precise positioning and stable connection without the complexities and inaccuracies of adhesive bonding processes.
3Ease of operation
If the yoke and frame are fixed by gluing, then the assembly is easier, but the magnetic circuit unit positioning is inaccurate leading to low reliability
Solution Approach 1:
The patent replaces the adhesive bonding system with a laser spot welding system that provides precise positional control. The laser spot welding process inherently positions the yoke and frame with high accuracy through controlled energy delivery and localized melting, eliminating the positioning errors and instability associated with glue application. This mechanical-thermal process maintains operational simplicity while dramatically improving magnetic circuit unit positioning reliability.
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 the reliability and stability of the speaker device by ensuring accurate assembly, preventing movement of the frame and yoke, optimizing performance, and reserving sufficient vibration space while avoiding structural interference.
Implementation Method 1
a side of the at least one second section close to the frame is in contact with and fixed to the frame by laser spot welding
Implementation Method 2
the voice coil is inserted in the magnetic gap... the voice coil driving the diaphragm to vibrate
Data Source
AI summary
A speaker device includes a frame, a vibration unit and a magnetic circuit unit. The vibration unit includes a diaphragm fixed to the frame and a voice coil. The magnetic circuit unit includes a yoke and a magnet assembly that is accommodated and fixed in the yoke and is spaced apart from the yoke to form a magnetic gap. The voice coil is inserted in the magnetic gap. The yoke includes a yoke bottom wall, a yoke side wall and flanges. The flange includes a first section and a second section extending from the first section. A side of the first section close to the second section and the second section enclose a fixing step. The second section is fixed to the frame. The speaker device of the present disclosure has better reliability.