Sounding Device Rear Cavity Air-Permeable Mesh
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Solution Overview
Problem
Conventional sounding devices in smart mobile devices lack effective low-frequency acoustic performance due to the absence of a rear cavity.
Innovation Solution
Incorporating an air-permeable mesh between the second magnet and the frame to create a rear cavity, which is filled with sound-absorbing powders, enhancing the low-frequency acoustic performance by forming a virtual acoustic cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If no rear cavity is provided in the sounding device, then the device structure remains simple, but the low-frequency acoustic performance deteriorates
Solution Approach 1:
The patent implements a nested structure where the rear cavity is formed by utilizing the space between the magnetic circuit system components (yoke, magnets) and the frame. The air-permeable mesh is nested within this cavity space, creating a compact design that improves low-frequency response without significantly increasing overall device volume or structural complexity.
Solution Approach 2:
The air-permeable mesh acts as an intermediary element within the rear cavity. It allows air molecules to pass through while providing structural support for the sound-absorbing powder, enabling the cavity to function as intended without compromising the voice coil assembly or other internal components.
2Reliability
If sound-absorbing powder is added to the rear cavity, then the low-frequency acoustic performance is improved, but the risk of powder entering the inner cavity and interfering with the voice coil increases
Solution Approach 1:
The air-permeable mesh serves as a physical barrier and intermediary between the rear cavity containing sound-absorbing powder and the inner cavity containing the voice coil. The mesh allows acoustic energy and air flow to pass through while blocking the sound-absorbing powder particles from migrating into the voice coil assembly area, thus eliminating the harmful effect.
Solution Approach 2:
The air-permeable mesh provides localized protection specifically at the boundary between the rear and inner cavities. It maintains the beneficial acoustic properties of the sound-absorbing powder in the rear cavity while creating a selective barrier that prevents powder contamination in the sensitive voice coil region, achieving different functional requirements in different spatial zones.
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 solution significantly improves low-frequency acoustic performance while ensuring the reliability of the device by preventing sound-absorbing materials from entering the inner cavity and interfering with the voice coil.
Implementation Method 1
an air-permeable mesh arranged between the second magnet and the frame
Implementation Method 2
the rear cavity is filled with sound-absorbing powders for forming a virtual acoustic cavity
Implementation Method 3
a voice coil for driving the diaphragm to vibrate and generate sound
Data Source
AI summary
The present disclosure discloses a sounding device including a frame, a vibration system, a magnetic circuit system, and an air-permeable mesh in a ring shape. The vibration system includes a diaphragm and a voice coil. The magnetic circuit system includes a yoke, a first magnet, and a second magnet in a ring shape around and spaced apart from the first magnet for forming a magnetic gap. One end of the air-permeable mesh is fixed to the second magnet, and another end of the air-permeable mesh is fixed to the frame. A rear cavity is formed jointly by the frame, the yoke, the second magnet and the air-permeable mesh. Compared with the related art, the sounding device disclosed by the present disclosure has a better low-frequency acoustic performance.