Sounding Device Yoke Segmentation and Laser Welding
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Solution Overview
Problem
The existing sounding devices in mobile terminal devices face structural interference due to the fixed yoke, leading to poor reliability and potential mechanical issues.
Innovation Solution
A sounding device design featuring a positioning bracket made of metal with a yoke and auxiliary magnet components arranged to form a magnetic gap, where the yoke extension walls and sidewalls are designed to surround the voice coil, and the auxiliary magnet components are fixed to the positioning bracket using laser spot welding, ensuring optimal performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the yoke is fixed to the frame, then the magnetic circuit system can be assembled, but structural interference occurs with other components resulting in poor reliability
Solution Approach 1:
The magnetic circuit system is divided into separate components: the yoke assembly (yoke + main magnet component) and the auxiliary magnet components are independently positioned and fixed to the positioning bracket. This segmentation allows each component to be assembled independently without causing structural interference with other components like the voice coil and diaphragm, thereby improving reliability.
2Manufacturing precision
If the auxiliary magnet components are fixed to the positioning bracket by laser spot welding, then assembly precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces traditional mechanical fastening methods (screws, clips, or adhesive bonding) with laser spot welding to fix the auxiliary magnet components to the positioning bracket. This substitution provides more precise and consistent positioning, ensuring accurate magnetic gap formation. Although laser welding adds manufacturing complexity, it eliminates the need for complex mechanical fixture designs and achieves superior assembly precision that cannot be obtained through conventional means.
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 mechanical strength of the sounding device by preventing structural interference and ensuring precise assembly, resulting in improved sound generation and product consistency.
Implementation Method 1
one side of each of the auxiliary magnet components away from the yoke is fixed to the positioning bracket by laser spot welding
Implementation Method 2
a voice coil inserted in the magnetic gap to drive the diaphragm to vibrate
Implementation Method 3
a magnetic circuit system configured to drive the vibration system to vibrate to generate sound
Data Source
AI summary
A sounding device includes a positioning bracket, a vibration system fixed to the positioning bracket, and a magnetic circuit system driving the vibration system to vibrate to generate sound. The vibration system includes a diaphragm fixed to the positioning bracket and a voice coil driving the diaphragm to vibrate. The magnetic circuit system includes a yoke, a main magnet component, and auxiliary magnet components. The yoke includes a yoke body, yoke extension walls, and yoke sidewalls. The auxiliary magnet component is fixed on the yoke extension wall. The main magnet component is sequentially spaced apart from the auxiliary magnet component and the yoke sidewall to form the magnetic gap. The positioning bracket is made of a metal material. One side of the auxiliary magnet component away from the yoke is fixed to the positioning bracket by laser spot welding. The sounding device has a better reliability.