Speaker Rubber Diaphragm Notch for Amplitude Balance
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Solution Overview
Problem
Speakers in portable electronic devices suffer from uneven vibration and sound distortion due to large differences in gas flow rates between positions near and far from the sound outlet, leading to amplitude discrepancies.
Innovation Solution
A speaker design featuring a notched rubber diaphragm at the second side of the dome, integrated skeleton, flexible support member, and adjustable spacers, along with a magnetic circuit system and voice coil configuration, to balance amplitudes and improve acoustic stability without affecting low-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vibration system operates in a containing space with a sound outlet, then sound emission is achieved, but large difference in gas flow rate between positions far away and close to the sound outlet causes large difference in amplitude and uneven vibration
Solution Approach 1:
The patent applies local quality by creating a notched part at a specific location on the rubber diaphragm (second side of the dome) to remove rubber material. This local modification balances the acoustic mass between the first side (close to sound outlet) and second side (far from sound outlet), reducing amplitude difference and improving vibration uniformity without affecting overall speaker performance
2Ease of manufacture
If the rubber diaphragm is made uniform, then manufacturing is simple, but amplitude difference between first side and second side causes sound distortion
Solution Approach 1:
The rubber diaphragm is designed with a notched part at the second side (far from sound outlet) where rubber material is removed. This creates local non-uniformity that compensates for the acoustic mass imbalance caused by the sound outlet position, reducing amplitude difference and sound distortion while maintaining relatively simple manufacturing processes
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 reduces amplitude differences and enhances acoustic stability, ensuring consistent sound quality across the frequency spectrum.
Implementation Method 1
a voice coil for driving the vibration member for vibrating and emitting sounds
Implementation Method 2
a magnetic circuit system includes a bottom plate, a center magnetic member fixed to the bottom plate and a side magnetic member disposed around the center magnetic member for forming a magnetic gap
Data Source
AI summary
A speaker is disclosed. The speaker includes a shell, a sounding unit and a fixing member. The shell has a sound outlet. The sounding unit includes a vibration member having a rubber diaphragm and a dome. The rubber diaphragm includes an inner suspension, an outer suspension and a main body connecting the two suspensions and covering the dome. The fixing member connects an inner fixing part of the inner suspension and the shell. The dome includes a first side close to the sound outlet and a second side far away from the sound outlet. The main body of the rubber diaphragm at the second side of the dome has a notched part formed by removing rubber of the rubber diaphragm for balancing amplitudes of the first side and the second side. The speaker can reduce the difference in amplitude and improve the acoustic stability without affecting the low frequency.