Dual-Speaker Rear Cavity Structure to Reduce Casing Vibration
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Solution Overview
Problem
Existing electronic devices face issues with casing vibration due to internal pressure fluctuations during sound emission, particularly at high excitation voltages, leading to poor acoustic performance and vibration damping.
Innovation Solution
The electronic device incorporates two spaced-apart sound-emitting devices with a first elastic damping member and a magnetic circuit system, forming dual suspension systems that reduce internal pressure fluctuations and enhance acoustic performance by phase opposition and elastic support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a two-in-one component with open-cavity design is used for sound emission, then the internal space of the terminal device serves as the rear cavity, but near the modal frequency or at high excitation voltage, the internal pressure becomes large resulting in serious casing vibration
Solution Approach 1:
The patent divides the sound emission system into separate components: a first sound-emitting device with a sealed rear cavity and a second sound-emitting device with an open front cavity. This segmentation allows each device to have optimized cavity designs that prevent casing vibration while maintaining sound emission functionality.
Solution Approach 2:
The patent introduces a first elastic damping member as an intermediary element between the magnetic bowl and the basket. This damping member acts as a mediator to reduce internal pressure fluctuations and prevent casing vibration while allowing the sound-emitting function to proceed effectively.
2Power
If the internal pressure of the terminal device becomes large during sound emission, then the sound emission function is achieved, but the casing vibration phenomenon occurs
Solution Approach 1:
The patent converts the harmful internal pressure fluctuations into a beneficial effect by using the first elastic damping member to absorb and dissipate this pressure. The damping member transforms the harmful mechanical stress into thermal energy through viscous damping, thereby preventing casing vibration while maintaining sound emission power.
Solution Approach 2:
The patent changes the physical state and properties of the damping member material to optimize its vibration damping performance. By selecting materials with appropriate viscoelastic properties and adjusting the damping member's geometric parameters, the system achieves effective pressure reduction without compromising sound emission capability.
3Reliability
If a vibration system with voice coil and diaphragm is used, then sound emission is achieved, but internal pressure fluctuations cause vibration
Solution Approach 1:
The patent applies beforehand cushioning by pre-installing the first elastic damping member to cushion against internal pressure fluctuations before they cause harmful effects. The damping member is positioned to absorb pressure variations during the sound emission process, preventing casing vibration and maintaining system stability.
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 dual suspension system effectively reduces casing vibration and enhances low-frequency sensitivity, improving overall acoustic performance by minimizing internal pressure variations.
Implementation Method 1
a first elastic damping member, the first elastic damping member is connected to the magnetic bowl and the basket for supporting vibration of the magnetic circuit system
Implementation Method 2
The dual suspension system effectively reduces casing vibration and enhances low-frequency sensitivity, improving overall acoustic performance by minimizing internal pressure variations
Implementation Method 3
a voice coil driving the diaphragm to vibrate for emitting sound
Implementation Method 4
a magnetic circuit system driving the vibration system to vibrate
Implementation Method 5
a magnetic gap is formed between the magnetic unit and the auxiliary magnetic. The voice coil is inserted into the magnetic gap
Implementation Method 6
a diaphragm fixed to the basket for vibrating and emitting sound
Data Source
AI summary
An electronic device includes a casing, a first sound-emitting device and a second sound-emitting device. The first sound-emitting device includes a basket, a vibration system and a magnetic circuit system. The vibration system includes a diaphragm and a voice coil. The magnetic circuit system includes a magnetic bowl, a magnetic unit and an auxiliary magnetic. The first sound-emitting device further includes an upper shell and a front cavity. The first sound-emitting device further includes a first elastic damping member. The diaphragm, the magnetic bowl, the basket and the first elastic damping member are sealed and enclosed to form a first rear cavity, and the first sound-emitting device, the second sound-emitting device and the casing are enclosed to form a second rear cavity. The sound-emitting device of the present invention with good vibration damping effect, high frequency response sensitivity and better acoustic performance.