Bone Conduction Speaker Resonance Assembly for Vibration Damping

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Solution Overview

Problem

Speakers that conduct sound through bones often produce excessive low-frequency vibrations, leading to discomfort and sound leakage, which degrade the sound quality.

Innovation Solution

Incorporating a vibration damping assembly with a first elastic element and a mass element to form a resonance assembly, which reduces mechanical vibration intensity and sound leakage by absorbing energy at specific frequencies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If speakers conduct sound through bones using vibration housing contact with facial skin, then sound transmission efficiency is improved, but low-frequency vibration amplitude increases causing discomfort and sound leakage

Engineering Contradiction:

Improvesound transmission efficiencyVSAvoidlow-frequency vibration discomfort

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies the tuned mass damper principle to convert the harmful low-frequency vibrations into a beneficial effect. By adding a mass element connected via elastic element to the vibration housing, the system creates a resonance assembly that absorbs excess vibration energy at specific frequencies, thereby reducing the harmful low-frequency vibrations while maintaining effective sound transmission through bone conduction

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the dynamic parameters of the vibration housing by introducing a resonance assembly with specific mass and elasticity properties. The mass ratio of the mass element to the vibration housing is controlled within 0.04-1.25, and the elastic element's stiffness is optimized to create a tuned mass damper that targets specific frequency ranges, thereby adjusting the vibration characteristics to reduce low-frequency discomfort

Inventive Principle:

Principle #35Parameter changes

2Reliability

If vibration housing directly contacts facial skin for bone conduction, then sound signal transmission is improved, but sound leakage increases

Engineering Contradiction:

Improvesound signal transmissionVSAvoidsound leakage

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The resonance assembly converts the problematic vibration energy that causes sound leakage into a controlled resonant response. The mass element and elastic element work together to absorb and dissipate excess vibration energy, reducing the amplitude of vibrations that would otherwise escape as unwanted sound, thereby minimizing sound leakage while preserving sound signal transmission

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-affected harmful factors

If resonance assembly with mass element is added to reduce vibrations, then low-frequency vibration sense is reduced, but device complexity increases

Engineering Contradiction:

Improvelow-frequency vibration senseVSAvoidspeaker structure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent segments the speaker system into distinct functional modules: the vibration housing for sound transmission, the mass element for vibration absorption, and the elastic element for connecting them. This modular segmentation allows the resonance assembly to be integrated without fundamentally redesigning the entire speaker structure, thereby managing complexity through functional decomposition

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The mass element is positioned within or adjacent to the vibration housing structure, with the elastic element nested between them. This nested arrangement allows the resonance assembly to be compactly integrated into the existing speaker form factor, minimizing the increase in device complexity while achieving vibration reduction

Inventive Principle:

Principle #7Nested doll (Nesting)

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 effectively minimizes low-frequency vibrations and sound leakage, enhancing user comfort and sound quality by dampening vibrations and improving sound transmission through bone conduction.

Implementation Method 1

the mass element may be connected to the first elastic element to form a resonance assembly

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

the vibration damping assembly with a first elastic element and a mass element to form a resonance assembly, which reduces mechanical vibration intensity and sound leakage by absorbing energy at specific frequencies

Methodology Applied

Scientific EffectVibration damping: Damping

Implementation Method 3

The vibration element may convert an electrical signal into a mechanical vibration

Methodology Applied

Scientific EffectElectromagnetic conversion: Electromagnetic Induction

Data Source

PatentUS12549905B2Speakers

Publication Date: 2026.02.10 SHENZHEN SHOKZ CO LTD

AI summary

The embodiments of the present disclosure provide a speaker. The speaker may include a vibration assembly and a first elastic element. The vibration assembly may include a vibration element and a vibration housing. The vibration element may convert an electrical signal into a mechanical vibration. The vibration housing may be in contact with facial skin of a user. The first elastic element may be elastically connected to the vibration housing.