Bone Conduction Speaker with Compound Vibration Device
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Solution Overview
Problem
Current bone conduction speakers suffer from limited tone quality due to overtopped resonance peaks in both low and high frequency areas, making it difficult to improve their acoustic performance.
Innovation Solution
A compound vibration device is introduced, comprising a vibration conductive plate and a vibration board, both with converging rods, which are fixed together and driven by a magnetic system. This configuration adjusts low and high frequency ranges, resulting in a flatter and wider frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single vibration board is used in current bone conduction speakers, then the structure is simple, but the frequency response has overtopped resonance peaks limiting tone quality
Solution Approach 1:
The single vibration board is segmented into two separate vibration boards with different characteristics. The first vibration board handles low-frequency vibrations while the second vibration board handles high-frequency vibrations, allowing each board to be optimized independently for its frequency range, thereby flattening the overall frequency response without excessive complexity
Solution Approach 2:
The patent uses vibration boards made of different materials or with different structural compositions to achieve different vibration characteristics. By combining materials with different acoustic properties, the system can control resonance peaks in different frequency ranges, improving tone quality while maintaining reasonable structural complexity
2Stability of the object's composition
If the vibration board is fixed rigidly to improve stability, then structural stability improves, but the frequency response becomes less controllable with sharp resonance peaks
Solution Approach 1:
The fixation method is made dynamic rather than rigidly fixed. The vibration boards are connected through elastic elements or flexible connections that allow controlled movement and vibration. This dynamic connection maintains structural stability while enabling better control over vibration characteristics and frequency response, reducing sharp resonance peaks
3Power
If resonance peaks are enhanced to increase sound intensity, then sound output improves, but tone quality deteriorates with abrupt frequency response
Solution Approach 1:
Different parts of the vibration system are given different local qualities optimized for specific frequency ranges. The first vibration board is optimized for low-frequency power output, while the second vibration board is optimized for high-frequency response. Each component has locally optimized properties that collectively produce a smooth overall frequency response while maintaining adequate sound intensity across the spectrum
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 compound vibration device achieves a flatter and wider frequency response, avoiding abrupt frequency responses and feeble sounds, thereby enhancing the tone quality and broadening the application prospects of bone conduction speakers.
Implementation Method 1
the second torus contains a fixed voice coil, which is driven by the magnetic system
Implementation Method 2
the vibration in the ear drum drives our auditory nerves, makes us feel the acoustic vibrations. The current bone conduction speakers are transferring vibrations through our skin, subcutaneous tissues and bones to our auditory nerves
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.