Bone Conduction Speaker Torus Vibration Device
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Solution Overview
Problem
Current bone conduction speakers suffer from limited tone quality due to overtopped resonance peaks in low or high frequency areas, resulting in abrupt frequency responses and feeble sound, which is difficult to improve with existing vibration devices.
Innovation Solution
A compound vibration device comprising a vibration conductive plate and a vibration board, where the plates are torus-shaped with converging rods, fixed together through a magnetic system, allowing for adjustable resonance peaks to achieve a flatter and wider frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single vibration device is used in bone conduction speakers, then the device complexity is reduced, but the frequency response becomes abrupt with overtopped resonance peaks, limiting tone quality
Solution Approach 1:
The vibration device is divided into two independent vibration boards (first vibration board and second vibration board) with different resonance characteristics. Each board is designed with specific rod structures (first rods and second rods) that converge to centers, allowing them to vibrate at different frequencies. This segmentation enables the system to achieve a flatter overall frequency response by combining the outputs of multiple vibration elements with complementary resonance peaks.
2Device complexity
If the vibration board and shell body are fixed together, then the structure is simplified, but the resonance peaks become overtopped and frequency response becomes abrupt
Solution Approach 1:
The first vibration board is extracted from the traditional fixed structure and positioned independently above the magnetic system, separated from the shell body by a specific distance. This extraction allows the first vibration board to vibrate freely without being constrained by the shell body, preventing the overtopping of resonance peaks that occurs when structures are rigidly fixed together. The magnetic system provides the necessary coupling without direct mechanical contact between the vibration board and shell.
3Device complexity
If resonance peaks are not adjusted, then the device is simpler, but the frequency response is limited and tone quality deteriorates
Solution Approach 1:
The patent employs parameter changes by adjusting the physical dimensions of the vibration boards, including the lengths and thicknesses of the first and second rods, the distances between components, and the material properties. These parameter adjustments allow tuning of the resonance peaks to achieve desired frequency response characteristics. The system can be configured to emphasize different frequency ranges by modifying these physical parameters.
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 solution provides a bone conduction speaker with a flatter frequency response, avoiding abrupt frequency responses and enhancing sound quality by adjusting low and high frequency ranges, thus improving tone perception.
Implementation Method 1
the voice coil, which is driven by the magnetic system
Implementation Method 2
the vibration transferred through our skin, subcutaneous tissues and bones to our auditory nerves, making us hear the sounds
Implementation Method 3
adjustable resonance peaks to achieve a flatter and wider frequency response
Data Source
AI summary
The present disclosure relates to a bone conduction speaker and its compound vibration device. The compound vibration device comprises a vibration conductive plate and a vibration board, the vibration conductive plate is set to be the first torus, where at least two first rods inside it converge to its center; the vibration board is set as the second torus, where at least two second rods inside it converge to its center. The vibration conductive plate is fixed with the vibration board; the first torus is fixed on a magnetic system, and the second torus comprises a fixed voice coil, which is driven by the magnetic system. The bone conduction speaker in the present disclosure and its compound vibration device adopt the fixed vibration conductive plate and vibration board, making the technique simpler with a lower cost; because the two adjustable parts in the compound vibration device can adjust both low frequency and high frequency area, the frequency response obtained is flatter and the sound is broader.