Bone Conduction Speaker with Compound Vibration Device
Find Innovative SolutionsGenerate Solutions
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 plate and board 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 structure is simple, but the frequency response becomes abrupt with overtopped resonance peaks, limiting tone quality
Solution Approach 1:
The patent divides the single vibration device into two separate vibration devices: a first vibration device (vibration conductive plate) and a second vibration device (vibration board). Each vibration device is responsible for different frequency ranges, with the first handling low frequencies and the second handling high frequencies. This segmentation eliminates the overtopped resonance peaks that occur when a single device attempts to cover the entire frequency range, resulting in a flatter and more balanced frequency response curve.
2Reliability
If the vibration board and shell body are tightly fixed together, then the vibration transfer efficiency is improved, but the resonance peaks become more pronounced, worsening the frequency response
Solution Approach 1:
The patent separates the vibration transfer path into two independent channels: one through the vibration conductive plate to the shell body, and another through the vibration board to the shell body. By using two separate fixation paths instead of one tight fixation, the patent reduces the amplification of resonance peaks while maintaining overall vibration transfer efficiency. The shell body receives vibrations from both devices independently, preventing the concentration of resonant energy that occurs with single-device tight fixation.
3Device complexity
If existing vibration devices are used, then the device structure is simple, but the frequency response curve shows overtopped peaks making tone quality improvement difficult
Solution Approach 1:
The patent employs two separate vibration devices that can be independently designed and tuned for specific frequency ranges. The first vibration device (vibration conductive plate) is optimized for low-frequency response, while the second vibration device (vibration board) is optimized for high-frequency response. This independent configuration allows each device to be adjusted and tuned separately, providing greater adaptability for achieving different frequency response characteristics and improving tone quality across the entire audio 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 solution provides a bone conduction speaker with a flatter and wider frequency response, enhancing tone quality by adjusting low and high frequency ranges, thereby avoiding abrupt frequency responses and feeble sounds, and simplifying the technology while reducing costs.
Implementation Method 1
the second torus contains a fixed voice coil, which is driven by the magnetic system
Implementation Method 2
the principle that we can hear sounds is that the vibration transferred through the air in our external acoustic meatus, reaches to the ear drum, and 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 invention 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 invention 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.