Sounding Device Yoke Flange Fixation for Reliability
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Solution Overview
Problem
The existing sounding devices in mobile terminal devices face structural interferences due to the fixation structure of the yoke and frame, leading to poor reliability and magnetic performance.
Innovation Solution
A sounding device design where the magnetic circuit system is fixed to the frame through a flange, with the yoke completely encasing the voice coil, eliminating the need for avoidance structures and optimizing magnetic performance, while the flange's fixation ensures proper positioning and internal space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the yoke is fixed to the frame using a conventional fixation structure, then the magnetic circuit system can be assembled, but structural interferences occur between the yoke and other components, resulting in poor reliability
Solution Approach 1:
The yoke is designed with a flange that extends in a direction perpendicular to the vibration direction of the diaphragm, transitioning the fixation approach to a different spatial dimension. This allows the magnetic circuit system to be fixed to the frame without causing structural interferences with other components, thereby improving reliability while avoiding complexity.
2Reliability
If avoidance structures are provided in the yoke to accommodate other components, then structural interferences are reduced, but the magnetic performance deteriorates
Solution Approach 1:
Instead of providing avoidance structures within the yoke body that would compromise magnetic performance, the invention extends the yoke with a flange in a perpendicular direction. This dimensional change allows the fixation function to be separated from the magnetic circuit path, ensuring both structural stability and optimal magnetic performance without interference.
3Object-affected harmful factors
If the yoke completely encases the voice coil, then magnetic performance is optimized, but the internal space of the sounding device is reduced
Solution Approach 1:
The yoke is segmented into two functional parts: the main body that completely encases the voice coil for optimized magnetic performance, and the flange that extends perpendicular to provide fixation and space optimization. This segmentation allows the magnetic circuit system to be divided into a magnetic field-generating portion and a structural fixation portion, achieving both goals simultaneously.
Solution Approach 2:
The flange extends in a direction perpendicular to the vibration direction of the diaphragm, utilizing a different spatial dimension to provide fixation functionality. This allows the main body of the yoke to maintain complete encasement of the voice coil for optimal magnetic performance, while the flange in the perpendicular dimension provides the necessary structural support and space optimization without compromising the magnetic field.
4Volume of stationary object
If the flange extends perpendicular to the vibration direction of the diaphragm, then internal space is optimized and structural interferences are avoided, but the fixation structure becomes more complex
Solution Approach 1:
The flange is merged with the yoke as an integral structure, combining the magnetic circuit function and the fixation function into a single component. This eliminates the need for separate fixation structures, reducing overall device complexity while achieving optimal internal space utilization and avoiding structural interferences through the perpendicular extension.
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 magnetic performance of the sounding device by avoiding structural interferences and optimizing internal space, resulting in improved sound emission and device stability.
Implementation Method 1
the end of the flange away from the side wall is fixed to the frame by laser welding
Implementation Method 2
a voice coil received in the magnetic gap for driving the diaphragm to vibrate
Data Source
AI summary
The present disclosure discloses a sounding device including a frame, a vibration system, and a magnetic circuit system. The vibration system includes a diaphragm, and a voice coil. The magnetic circuit system includes a yoke, a magnet assembly, and a magnetic gap. The yoke includes a bottom wall, a side wall in an annular shape extending from an edge of the bottom wall toward the diaphragm, and a flange extending from an end of the side wall close to the diaphragm toward the frame. An end of the flange away from the side wall is fixed to the frame. Compared with the related art, the sounding device disclosed by the present disclosure has a better reliability.