Sound Production Module With Separate Rear Cavities
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Solution Overview
Problem
Existing sound production modules in electronic devices face challenges such as increased nonlinear distortion, swing vibration, and abnormal sound due to airflow interference between shared acoustic rear cavities in double-sided sound production units, and they also occupy large mounting space and increase manufacturing costs.
Innovation Solution
A sound production module with a sound production unit that includes a receiver unit and a speaker unit, both sharing a magnetic circuit system, but with separate rear cavities to prevent airflow interference. The module also includes an expansion cavity and a communication hole to enhance low-frequency intensity and improve sound production effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared acoustic rear cavity is used in double-sided sound production units, then the structure is simplified and manufacturing cost is reduced, but airflow interference occurs between vibration systems causing increased nonlinear distortion and swing vibration
Solution Approach 1:
The patent divides the acoustic rear cavity into separate independent cavities for each vibration system. Instead of using a shared cavity, each speaker unit has its own dedicated rear cavity, which eliminates airflow interference between the two vibration systems while maintaining structural simplicity through modular design.
2Reliability
If two independent devices (speaker module and receiver unit) are stacked back-to-back, then stereo effect and privacy protection are improved, but mounting space and device thickness increase significantly
Solution Approach 1:
The patent merges the speaker module and receiver unit into a single integrated sound production unit. The two vibration systems share common components including the magnetic circuit system, front plate, and rear plate, while maintaining separate acoustic rear cavities. This integration significantly reduces mounting space and device thickness compared to back-to-back stacking of independent devices.
Solution Approach 2:
The magnetic circuit system serves dual functions by supporting both the speaker unit and receiver unit vibration systems. The same magnetic circuit system provides magnetic field for both voice coils, eliminating the need for separate magnet systems and reducing overall device volume.
3Adaptability or versatility
If two independent devices are stacked back-to-back, then dual functionality is achieved, but the number of parts increases resulting in higher manufacturing cost
Solution Approach 1:
The patent combines multiple functions into fewer components. The single magnetic circuit system replaces two separate magnet systems, the shared front plate and rear plate replace multiple housing components, and the integrated design reduces the total number of parts. This merging maintains dual speaker and receiver functionality while lowering manufacturing cost through reduced part count and simplified assembly.
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 reduces the number of magnet systems, simplifies the structure, and reduces the overall thickness of the sound production module, while preventing airflow interference and enhancing low-frequency intensity, thereby improving the sound production effect.
Implementation Method 1
a magnetic circuit system, a vibration system of the receiver unit and a vibration system of the speaker unit are provided on two opposite sides of the magnetic circuit system
Implementation Method 2
The receiver unit is provided with a communication hole for communicating the first rear cavity with a space outside the sound production module
Data Source
AI summary
A sound production module and a terminal device are disclosed. The sound production module includes a sound production unit and an expansion cavity, the sound production unit includes a magnetic circuit system, a receiver unit including a first diaphragm and a speaker unit opposite to the receiver unit and including a second diaphragm. Vibration systems of the receiver unit and the speaker unit are on two opposite sides of the magnetic circuit system. A first rear cavity is formed between the first diaphragm and the magnetic circuit system. A second rear cavity is formed between the second diaphragm and the magnetic circuit system. The first rear cavity is separated from the second rear cavity and the expansion cavity. The receiver unit is provided with a communication hole for communicating the first rear cavity with a space outside the sound production module and not communicated with the expansion cavity.