Conductive Damper for Bone Conduction Speaker
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Solution Overview
Problem
Bone conduction headphones suffer from unreasonable structure, low sensitivity, serious sound leakage, and poor mechanical efficiency, which fail to meet user requirements and can cause hearing damage due to electromagnetic waves and sound diffusion.
Innovation Solution
A bone conduction speaker with a conductive damper featuring a circle-shaped damper and bracket design that increases vibration amplitude, improves sensitivity, and enhances mechanical efficiency by using a U-yoke, magnet, spring washer, and a conductive damper with copper foils for electrical conduction, eliminating the need for a voice coil lead wire and optimizing production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional damper made from fiber, cloth, or rubber is used in bone conduction headphones, then the structure is simple, but the sensitivity and mechanical efficiency are low
Solution Approach 1:
The patent applies composite materials by combining conductive materials (copper foil, aluminum foil) with damping materials (rubber, foam) to create a conductive damper. This composite structure simultaneously provides mechanical damping function and electrical conductivity, resolving the contradiction between simple structure and high sensitivity by integrating multiple functions into a single component.
Solution Approach 2:
The patent merges the damping function and electrical conduction function into a single conductive damper component. By combining the voice coil damper and lead wire into one integrated structure with copper foil or aluminum foil layers, the design eliminates the need for separate components while improving sensitivity and mechanical efficiency.
2Object-affected harmful factors
If air vibrational conduction earphones are used, then sound transmission is simple, but electromagnetic waves are produced causing damage to brain and hearing nerve
Solution Approach 1:
The patent replaces the traditional electromagnetic sound transmission system with a mechanical bone conduction system. By using a conductive damper that directly transmits mechanical vibrations through bone contact, the design eliminates the need for electromagnetic wave generation while maintaining sound transmission functionality, thus removing harmful electromagnetic radiation.
3Object-affected harmful factors
If air vibrational conduction earphones are used, then earphones can be plugged into ears, but other sounds are difficult to get into ears causing safety issues
Solution Approach 1:
The patent segments the sound transmission path by providing separate channels: bone conduction for audio signals and air conduction for environmental sounds. The conductive damper transmits only the audio signal through bone, while leaving the ear canal open to receive ambient sounds, thus resolving the contradiction between sound isolation and situational awareness.
4Object-generated harmful factors
If traditional bone conduction headphone structure is used, then manufacturing is simple, but sound leakage is serious
Solution Approach 1:
The patent uses flexible thin films (copper foil, aluminum foil) as conductive dampers that can be conformally attached to the vibration source. These thin film structures provide effective sound isolation to prevent leakage while maintaining simple manufacturing processes, as the foils can be easily cut, shaped, and attached without complex assembly steps.
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 conductive damper design expands vibration amplitude, reduces power consumption, improves mechanical efficiency, and extends the speaker's lifespan by eliminating lead wire issues, while minimizing size and sound leakage, and enhancing bass effects.
Implementation Method 1
the sound source stereo current signal flows through the voice circle, producing an alternating electromagnetic force, causing the relative movement between the voice circle and the magnet
Implementation Method 2
Bone conduction is the transformation of sound into different frequencies of mechanical vibrations, transmitting sound waves through the human skull, bone loss, lymphatic transmission of an inner ear, helix, auditory nerve and auditory center
Data Source
AI summary
A bone conduction speaker with a conductive damper includes an outer bracket and a U-yoke; a centre of the U-yoke forms a U-shaped groove; the U-shaped groove of the U-yoke has a magnet, a top of the magnet is provided with a spring washer; between the magnet and the U-yoke, there is an annular space; a top of the U-yoke is provided with an annular bracket, a top of the annular bracket is provided with a conductive damper; the conductive damper includes an outer circle, an inner circle and several connecting parts, the inner circle is fitted with a voice coil; a central position of the inner circle is fitted with a pillar, a middle of the pillar is provided with a round shrapnel, a top of the pillar is provided with a conduct piece; a periphery of the round shrapnel is fitted on the outer bracket.