Speaker With Dual Vibration System For Shell Vibration Control
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Solution Overview
Problem
Existing speakers in audio devices experience excessive shell vibration near resonant frequencies or with high excitation voltage, affecting user experience due to inadequate damping mechanisms.
Innovation Solution
A speaker design incorporating a spring damping element connected between the magnetic circuit unit and the frame, along with a weight in the rear cavity, to create a dual vibration system that reduces forces on the frame by opposing vibrations and adjusts resonant frequency and damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a fixed boundary is used to transfer force from the voice coil, then the speaker can produce sound, but excessive force causes shell vibration near resonant frequency
Solution Approach 1:
The patent introduces a damping element as an intermediary component between the voice coil assembly and the housing. This damping element absorbs excessive vibration energy and prevents direct transmission of force to the housing, thereby reducing shell vibration while maintaining sound output capability.
Solution Approach 2:
The patent converts the harmful excessive vibration energy into beneficial damping effects by using vibration-absorbing materials. The damping element transforms the harmful mechanical vibrations into thermal energy through material hysteresis, effectively reducing shell vibration while maintaining acoustic performance.
2Volume of moving object
If the speaker is placed in a closed housing, then the audio device is compact, but the damping effect is insufficient to reduce shell vibration
Solution Approach 1:
The patent applies local quality by placing damping elements specifically at the interface between the voice coil assembly and the housing, where vibration transmission occurs. This localized damping approach provides effective vibration reduction without requiring the entire housing to be designed with damping properties, maintaining compact size.
Solution Approach 2:
The patent employs composite damping materials that combine vibration-absorbing properties with structural support capabilities. These composite materials allow the damping element to both reduce shell vibration and maintain the structural integrity of the compact housing design.
3Object-affected harmful factors
If a damping element is added to reduce shell vibration, then user experience improves, but the device complexity increases
Solution Approach 1:
The patent uses thin-film or flexible damping elements that can be easily integrated into the existing speaker structure. These thin-film damping materials provide effective vibration reduction while adding minimal structural complexity and occupying little space within the compact housing.
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 vibration system optimizes damping, reducing shell vibration and enhancing user experience by minimizing forces on the frame and allowing for precise tuning of resonant frequencies and damping.
Implementation Method 1
a spring damping element elastically connecting the magnetic circuit unit to the frame
Implementation Method 2
the spring damping element supporting the magnetic circuit unit to vibrate in the accommodating space
Implementation Method 3
a voice coil driving the diaphragm to vibrate and produce sound
Implementation Method 4
a magnetic circuit unit configured to drive the vibration unit to vibrate and produce sound
Implementation Method 5
a damping layer stacked on and fixed to the first stiffness layer
Data Source
AI summary
A speaker includes housing having receiving space and sound-producing unit received in receiving space. The sound-producing unit includes frame; vibration unit; magnetic circuit unit; spring damping element elastically connects magnetic circuit unit to frame and supports magnetic circuit unit to vibrate in accommodating space. A weight is fixed to magnetic circuit unit. In speaker, magnet or yoke and spring damping element form another vibration unit. This another vibration unit and the vibration unit that is composed of voice diaphragm, dome, and voice coil are subjected to interaction forces and vibrate in opposite directions, which reduces force on frame. The weight is added to magnetic circuit unit, which reduces the impact of air in rear cavity on magnet. Moreover, by adjusting mass of weight and stiffness and damping of spring damping element, corresponding resonant frequency and damping of magnetic circuit unit may be set, thereby achieving an optimal vibration isolation effect.