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 either low or high frequency areas, resulting in abrupt frequency responses and feeble sounds, which are 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 structure is simple, but the frequency response curve shows overtopped resonance peaks resulting in poor 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 has its own resonance peak at different frequency ranges, and when combined, they create a composite frequency response that fills in the dips between individual peaks, resulting in a flatter overall frequency response curve and improved tone quality.
2Reliability
If the vibration board and shell body are fixed together, then the vibration transfer is efficient, but the resonance peaks become overtopped limiting tone quality
Solution Approach 1:
The system separates the vibration transfer function from the resonance generation function. The first vibration board is fixed to the shell body for efficient vibration transfer, while the second vibration board is suspended to generate additional resonance. This segmentation allows each component to perform its specific function without interfering with the other, maintaining vibration transfer efficiency while improving tone quality through combined resonance.
Solution Approach 2:
The second vibration board acts as an intermediary element that mediates between the primary vibration source and the final sound output. It is suspended by elastic elements that allow it to vibrate at its own resonance frequency, adding a secondary resonance component that combines with the primary vibration to create a flatter frequency response and better tone quality.
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 improved tone quality by flattening the frequency response curve, avoiding abrupt frequency responses and enhancing sound quality across a broader range, thus addressing the limitations of single vibration devices.
Implementation Method 1
a magnetic system, and the second torus contains a fixed 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
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.