Magnetic Frame Sealing Cap for Acoustic Device Stability
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Solution Overview
Problem
In acoustic devices for portable electronic products, the magnetic circuit system cannot be directly fixed to the frame due to structural restrictions, limiting the development of acoustic performance.
Innovation Solution
The acoustic device incorporates a magnetic frame sealing cap made of stainless steel, which fixes and supports the magnetic circuit system, and a vibration system with multiple second vibrating diaphragms and flexible printed circuits to enhance stability and reliability, while optimizing the magnetic and acoustic performance by preventing magnetic induction line leakage and reducing the volume of the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the magnetic circuit system is directly fixed to the frame through alignment features, then the structural stability is improved, but the acoustic performance development is restricted due to block and restriction by the second vibrating diaphragm and flange structures
Solution Approach 1:
The magnetic circuit system is segmented into separate components: the magnetic yoke, the magnet, and the magnetic frame sealing cap. This segmentation allows each component to be optimized independently and fixed through alternative means that do not interfere with acoustic performance, resolving the contradiction between structural stability and acoustic development.
Solution Approach 2:
The magnetic frame sealing cap acts as an intermediary component between the magnetic circuit system and the frame. It provides the necessary structural support and fixation while allowing acoustic waves to pass through without interference, thus maintaining both structural stability and acoustic performance.
2Volume of moving object
If the frame volume is reduced to optimize portability, then the device compactness is improved, but the structural support for the magnetic circuit system becomes more difficult to achieve
Solution Approach 1:
The magnetic frame sealing cap functions as a thin, flexible sealing structure that provides adequate structural support for the magnetic circuit system while occupying minimal space. This allows the frame volume to be reduced without compromising the structural support capability.
Solution Approach 2:
The magnetic frame sealing cap is made of stainless steel, a composite material that provides high strength-to-weight ratio and magnetic properties. This enables the structure to maintain sufficient support capability in a compact form factor.
3Stability of the object's composition
If multiple second vibrating diaphragms are added to enhance voice coil stability, then the vibration stability is improved, but the device complexity increases
Solution Approach 1:
The multiple second vibrating diaphragms are merged with the voice coil assembly as an integrated structure. This combination provides enhanced stability while minimizing the increase in overall device complexity by sharing common support structures and mounting mechanisms.
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 improves the acoustic performance by stabilizing the voice coil, reducing rear cavity leakage, and minimizing interference with other devices, resulting in enhanced sound quality and reliability.
Implementation Method 1
a magnetic circuit system configured to drive the vibration system to vibrate
Implementation Method 2
a voice coil configured to drive the first vibrating diaphragm to vibrate and produce a sound
Implementation Method 3
a first vibrating diaphragm fixed to a frame, a voice coil configured to drive the first vibrating diaphragm to vibrate and produce a sound
Data Source
AI summary
The present disclosure provides an acoustic device, including a frame, a vibration system fixed to the frame, a magnetic circuit system configured to drive the vibration system to vibrate and produce a sound, and a magnetic frame sealing cap configured to fix the magnetic circuit system to the frame, where the magnetic circuit system includes a magnetic yoke and a magnet fixed to the magnetic yoke, the magnetic frame sealing cap includes a bottom wall and a side wall that is in a ring shape and is bent and extends from a periphery of the bottom wall, the magnetic yoke is fixed to the bottom wall, and the side wall is fixed to the frame. Compared with the related art, the acoustic performance of the acoustic device of the present disclosure is optimal.