Bone Conduction Transducer Damping for Resonance and Noise Control
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Solution Overview
Problem
Existing electroacoustic transducers and headphones using bone conduction experience unstable performance due to wild vibrations and abnormal noise caused by resonance and unintended vibration directions, leading to discomfort and potential failure.
Innovation Solution
An electroacoustic transducer with a main frame, vibration unit, and an elastic member made of organic or polymer material, which suppresses unwanted vibrations and maintains stable performance by damping resonance and controlling displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration unit is used to transmit bone conduction vibration, then sound output is achieved, but wild vibration at resonance points and abnormal noise occur
Solution Approach 1:
An elastic member is introduced as an intermediary between the vibration unit and the main frame. This elastic member absorbs and dampens wild vibrations at resonance points, preventing them from propagating through the main frame and causing abnormal noise, while still allowing the vibration unit to effectively transmit bone conduction vibration.
Solution Approach 2:
The elastic member changes the vibration characteristics of the system by introducing damping properties. It modifies the resonance behavior and vibration transmission parameters, reducing the amplitude of wild vibrations and abnormal noise while maintaining the effectiveness of bone conduction sound transmission.
2Reliability
If the vibration unit vibrates in unintended directions, then resonance occurs, but stable performance cannot be maintained
Solution Approach 1:
The elastic member acts as a mediator that constrains the vibration unit to vibrate primarily in the intended axial direction. It provides restoring forces that counteract vibrations in unintended directions, thereby reducing resonance caused by off-axis vibrations and maintaining stable performance.
3Object-generated harmful factors
If an elastic member made of organic substance or polymer material is added, then wild vibration and abnormal noise are suppressed, but device complexity increases
Solution Approach 1:
The elastic member is implemented as a flexible component made of organic substance or polymer material. This flexible structure effectively suppresses wild vibration and abnormal noise through its damping properties, while its simple form factor minimizes the increase in device complexity.
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 stable performance and improved sound quality by reducing abnormal noise and resonance, ensuring consistent operation and reducing the risk of failure.
Implementation Method 1
an elastic member connected to at least the vibration unit and formed of an organic substance or a polymer material
Implementation Method 2
suppresses unwanted vibrations and maintains stable performance by damping resonance
Implementation Method 3
a vibration unit disposed inside the main frame and configured to vibrate along an axial direction of the main frame in response to an input signal
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
An electroacoustic transducer 1 that transmits vibration to a bone includes a main frame 10 having at least a cylindrical portion, a vibration unit 30 disposed inside the main frame and configured to vibrate along an axial direction of the main frame in response to an input signal, and an elastic member 20 connected to at least the vibration unit and formed of an organic substance or a polymer material.