Sound Generator Rear Cavity Vertical Stacking
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Solution Overview
Problem
Existing sound generating devices face challenges in miniaturization while maintaining good low-frequency performance and acoustic quality due to the need for larger rear cavities, which increases space occupation and leads to irregular airflow and distortion issues.
Innovation Solution
A sound generator design with a shell that sequentially accommodates a vibration system and a magnetic circuit system, featuring a magnetic conductive yoke, central, and side magnetic circuit portions with a rear sound hole and cavity, where the rear cavity is directly formed below the magnetic circuit system and closed by a lower cover plate, allowing for a regular and large rear cavity space without additional box structure, thus minimizing horizontal space occupation and enhancing acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large rear cavity is formed to improve low-frequency performance, then low-frequency resonance frequency is reduced and acoustic performance is improved, but the horizontal space occupation increases which is not conducive to miniaturization
Solution Approach 1:
The patent changes the spatial arrangement from horizontal to vertical by forming the rear cavity directly below the magnetic circuit system rather than beside it. This vertical stacking allows the rear cavity to be accommodated within the height dimension of the existing device footprint, thereby improving low-frequency performance without increasing horizontal space occupation.
Solution Approach 2:
The rear cavity is nested within the vertical profile of the device by positioning it below the magnetic circuit system and closing it with a lower cover plate. This nesting approach allows the rear cavity to utilize the vertical space already allocated for the device, effectively hiding the large cavity volume within the existing device envelope without expanding horizontal dimensions.
2Volume of moving object
If the volume of the sound generating device is reduced for miniaturization, then the volume of the rear cavity is reduced, but this degrades low-frequency performance
Solution Approach 1:
The invention maintains a large rear cavity volume by extending it vertically below the magnetic circuit system rather than horizontally. This allows the device to achieve miniaturization in the horizontal plane while preserving the necessary rear cavity volume for low-frequency performance through vertical space utilization.
3Device complexity
If an irregular shaped rear cavity is formed, then the structure is simple, but the airflow from the sound generator into the rear cavity is unstable causing polarization and distortion
Solution Approach 1:
The rear cavity is formed with a regular shape by utilizing the vertical space below the magnetic circuit system. This regular vertical geometry provides stable and predictable airflow paths from the sound generator into the rear cavity, eliminating the polarization and distortion issues associated with irregular shaped cavities while maintaining structural simplicity.
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 achieves miniaturization of the sound generating device while maintaining good acoustic performance by optimizing the rear cavity space and airflow stability, resulting in improved low-frequency performance and reduced space occupation.
Implementation Method 1
a magnetic gap is formed between the central magnetic circuit portion and the side magnetic circuit portion; and at least one of the central magnetic circuit portion and the side magnetic circuit portion is provided with a permanent magnet
Implementation Method 2
The larger the rear cavity, the lower the low-frequency resonance frequency of the product, thereby the low-frequency performance of the product is improved
Data Source
AI summary
A sound generator comprises a shell, a vibration system and a magnetic circuit system, wherein the shell sequentially accommodates and fixes the vibration system and the magnetic circuit system from top to bottom; the magnetic circuit system comprises a magnetic conductive yoke, and a central magnetic circuit portion and a side magnetic circuit portion that are mounted on an upper surface of the magnetic conductive yoke; a magnetic gap is formed between the central magnetic circuit portion and the side magnetic circuit portion; and at least one of the central magnetic circuit portion and the side magnetic circuit portion is provided with a permanent magnet; the magnetic circuit system is provided with a rear sound hole; a rear cavity in communication with the rear sound hole is provided directly below the magnetic circuit system.