Bone Conduction Speaker Asymmetric Drive Angle
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Solution Overview
Problem
Existing bone conduction speakers face challenges in achieving optimal sound quality due to inefficiencies in transmitting sound vibrations through the human body, particularly in balancing low-frequency and high-frequency sound transmission.
Innovation Solution
The design incorporates a driving device with a coil and magnetic system where the axis is perpendicular to the radial plane, and a panel connected through a transmission path with varying stiffness, allowing for a specific angle between the driving force and normal line to enhance sound transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving device axis is aligned parallel to the normal line of the panel, then the sound transmission efficiency is maximized, but the low-frequency sensitivity is insufficient and high-frequency sound leakage increases
Solution Approach 1:
The patent applies asymmetry by deliberately misaligning the driving device axis with the panel normal line, creating a specific angle between them. This asymmetric configuration transforms the force transmission characteristics, reducing high-frequency vibrations that cause sound leakage while maintaining effective bone conduction transmission.
Solution Approach 2:
The patent changes the angular parameter between the driving device axis and panel normal line from 0 degrees (parallel alignment) to a specific non-zero angle. This parameter modification optimizes the force distribution, enhancing low-frequency sensitivity and reducing high-frequency sound leakage simultaneously.
2Stability of the object's composition
If the transmission path has high stiffness, then the structural stability is improved, but the low-frequency sound transmission is reduced
Solution Approach 1:
The patent applies local quality by differentiating the stiffness characteristics at different locations in the transmission path. The connection component provides localized stiffness support for structural stability, while the vibration transmission sheet provides localized flexibility for low-frequency sound transmission, creating a non-uniform stiffness distribution optimized for dual performance.
3Area of stationary object
If the panel area is increased, then the sound transmission surface is enlarged, but the device size and weight increase
Solution Approach 1:
The patent employs composite materials in the panel construction, combining materials with different properties to achieve high sound transmission efficiency in a thin, lightweight structure. This allows maximizing the effective panel area for bone conduction while minimizing the overall device weight through material optimization.
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
This configuration improves sound quality by adjusting the frequency response curve, increasing low-frequency sensitivity and reducing sound leakage, resulting in a more balanced and effective sound transmission experience.
Implementation Method 1
The driving device may include a coil and a magnetic system
Implementation Method 2
the vibration of the sound may be transmitted to the human auditory nerve through the human skin, subcutaneous tissue, and bones
Data Source
AI summary
The present disclosure provides a bone conduction speaker. The bone conduction speaker may include a driving device and a panel. The driving device may be configured to generate a driving force, and the driving force is located in a straight line. The panel may be transmissibly connected to the driving device. The panel may be configured to conduct sound. A region through which the panel interacting with the user's body may have a normal line. The normal line may not be parallel to that straight line.