Acoustic Exciter with Segmented Vibration Mass for Broad Frequency Range
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Solution Overview
Problem
Conventional acoustic exciters suffer from low operating efficiency and narrow sound reproduction range due to energy consumption by the constant vibration mass, leading to attenuation in the high frequency region and poor sound quality.
Innovation Solution
The acoustic exciter incorporates a magnetic circuit, suspension, frame, voice coil, and a vibrator coupled via an elastic body that allows independent movement, enhancing vibration efficiency and broadening the sound reproduction range by optimizing the compliance and mechanical resistance of the elastic body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vibration mass is kept constant to ensure stable operation, then the acoustic exciter provides substantial vibration at the lowest resonance frequency, but the vibration decreases in other frequency regions due to energy consumption by the load of the entire vibration mass
Solution Approach 1:
The patent divides the vibration mass into two separate masses: a first vibration mass (magnetic circuit and part of suspension) and a second vibration mass (vibrating section, voice coil, frame section, and part of suspension). This segmentation allows each mass to be optimized for different frequency ranges, reducing the energy loss that occurs when a single constant mass must serve all frequency regions.
Solution Approach 2:
The patent introduces a variable vibration mass mechanism where the second vibration mass can be selectively connected to or disconnected from the first vibration mass based on the desired frequency range. This dynamic adjustment allows the system to optimize its mass for different operating conditions, improving efficiency across the entire frequency spectrum rather than being constrained by a fixed mass.
2Power
If the constant vibration mass is used, then the acoustic exciter achieves series resonance at the lowest resonance frequency, but the sound reproduction range becomes narrow and attenuation increases in the high frequency region
Solution Approach 1:
By segmenting the vibration mass into two independent masses that can operate separately or together, the patent enables the acoustic exciter to cover a broader frequency range. The first mass handles lower frequencies while the second mass handles higher frequencies, eliminating the narrow bandwidth limitation of a single constant mass system.
Solution Approach 2:
The patent changes the vibration mass parameter dynamically by selectively connecting or disconnecting the second vibration mass. This parameter change allows the system to adapt its resonant frequency and impedance characteristics to match different operating requirements, thereby expanding the sound reproduction range and reducing high-frequency attenuation.
3Device complexity
If the vibrating section and frame section are integrally formed as a unitized body, then the structure is simplified, but the vibration speeds of both sections are the same which reduces operating efficiency
Solution Approach 1:
The patent separates the vibrating section and frame section into independent components with separate vibration masses. This segmentation allows each section to vibrate at its own optimized speed and frequency, improving operating efficiency while maintaining structural simplicity through modular design.
Solution Approach 2:
The patent introduces independent suspension systems for each vibration mass, allowing the vibrating section and frame section to move independently with different vibration speeds. This dynamic independence enables each component to operate at its optimal frequency, significantly improving overall system efficiency compared to the rigid unitized structure.
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
This design improves sound pressure by approximately 6 dB and extends the sound reproduction range, with increased vibration speed and efficiency, while maintaining stability and reliability, especially in high-frequency regions.
Implementation Method 1
Vibration is generated as the result of transaction between the magnetic circuit and the vibrator attracting/repelling to each other. When electricity is led to voice coil 228 of the above-structured acoustic exciter, attracting/repelling forces are generated with respect to magnetic circuit 221.
Implementation Method 2
suspension 225 which is made of an elastic plate material
Data Source
AI summary
An acoustic exciter comprises a suspension made of an elastic material, which is coupled to the opening part of a frame, and a vibrator to which a voice coil disposed in the magnetic gap of a magnetic circuit connected to the suspension is coupled. An elastic body is so disposed between the frame and the vibrator as to be pressed against the frame and the vibrator. Thereby, the exciting efficiency of the vibrator can be increased, and the performance and tone quality of the acoustic exciter can be improved.