Speaker Module Dual Diaphragm Acoustic Tuning
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Solution Overview
Problem
Current speaker modules in smartphones suffer from sharp acoustic peaks and valleys in the medium-high frequency curve due to resonance, resulting in harsh sound and poor listening experience.
Innovation Solution
A speaker module design featuring a first and second diaphragm horizontally spaced apart within a cavity structure, with a powder mesh structure and a magnetic circuit system, allowing for adjustment of medium-high frequencies and improved sound quality by preventing foreign matter contact and enhancing ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single diaphragm speaker module is used to reduce size, then the speaker thickness and device size are reduced, but sharp acoustic peaks and valleys appear in the medium-high frequency curve due to resonance, resulting in harsh sound and poor listening quality
Solution Approach 1:
The single diaphragm is segmented into two diaphragms (first diaphragm and second diaphragm) spaced apart horizontally. The first diaphragm handles low-frequency sound while the second diaphragm adjusts medium-high frequencies, allowing independent optimization of different frequency ranges and eliminating resonance peaks and valleys in the medium-high frequency curve
Solution Approach 2:
The two diaphragms are arranged in the horizontal dimension (spaced apart horizontally) rather than stacking vertically, which maintains compact vertical profile while introducing a new spatial dimension for frequency separation and control
2Reliability
If the rear cavity space is increased to improve low-frequency performance, then low-frequency sound quality is enhanced, but the overall device size increases
Solution Approach 1:
The first cavity body containing the vibration module is nested within or adjacent to the second cavity body (rear cavity). This nested arrangement allows the rear cavity space to be effectively utilized without increasing the overall device envelope, as the cavities share space efficiently in the horizontal direction
3Reliability
If a powder mesh structure is added to prevent foreign matter contact with the second diaphragm, then sound quality is protected, but device complexity increases
Solution Approach 1:
A powder mesh structure with porous characteristics is placed in the second cavity body to allow air passage while blocking foreign matter. The porous structure provides acoustic permeability for sound waves while physically preventing dust and debris from reaching the second diaphragm, protecting sound quality without requiring complex sealing 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
The design improves sound quality by smoothing the medium-high frequency curve, providing a better listening experience and increased compactness without affecting low-frequency performance.
Implementation Method 1
The magnetic circuit system and the voice coil structure are both disposed in the second sub-cavity, the first diaphragm is driven by the magnetic circuit system and the voice coil structure to vibrate
Implementation Method 2
the second diaphragm is driven by the first diaphragm to vibrate
Data Source
AI summary
A speaker module includes a first cavity body, a second cavity body disposed adjacent to the first cavity body and a vibration module disposed in the first cavity body and including a first diaphragm and a second diaphragm which are horizontally spaced apart. The first cavity body includes a first sub-cavity and a second sub-cavity which are respectively located on two opposite sides of the vibration module, and the second sub-cavity is communicated with the second cavity body.