Bone Conduction Speaker 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 either 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 first torus is fixed with a magnetic system and the second torus contains a voice coil, with staggered rods and specific dimensions to adjust resonance peaks, providing 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 is abrupt with overtopped resonance peaks resulting in poor tone quality
Solution Approach 1:
The vibration device is segmented into multiple independent vibration elements (first vibration board, second vibration board, first vibration conductive plate, second vibration conductive plate) that can be designed with different resonance characteristics. Each segment contributes to different frequency ranges, allowing the overall system to achieve a flatter frequency response without requiring a single complex vibration device.
2Ease of manufacture
If traditional vibration boards and fixers are used, then the device is simple to manufacture, but the frequency response has overtopped resonance peaks limiting tone quality
Solution Approach 1:
The invention uses composite vibration structures combining vibration boards (first and second) with vibration conductive plates (first and second). These composite elements have different material properties and vibration characteristics that work together to suppress resonance peaks and achieve consistent tone quality across different frequency ranges, while maintaining manufacturability through modular assembly.
3Stability of the object's composition
If the vibration board is fixed rigidly with fixers, then the structure is stable, but the frequency response becomes abrupt with feeble sound
Solution Approach 1:
Vibration conductive plates are introduced as intermediary elements between the vibration boards and the fixing structure. These plates serve as mediators that transmit vibration while allowing for controlled flexibility and resonance management. The intermediary structure prevents direct rigid coupling that would cause abrupt frequency response, while maintaining structural stability for reliable fixation.
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 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 first torus is fixed on a magnetic system, and the second torus contains a fixed voice coil, which is driven by the magnetic system
Implementation Method 2
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.