Antistatic Sound-Absorbing Component for Speaker Modules

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Solution Overview

Problem

The existing sound-absorbing components in speaker modules face challenges with low fill rates and electrostatic issues due to static electricity generated by non-foaming porous materials, leading to incomplete filling and packaging problems, which restrict acoustic performance and increase the risk of particle leakage.

Innovation Solution

Incorporating an antistatic material into the housing or coating it on the surface, and applying electric inductive metal films or antistatic agents to the sound-absorbing particles to enhance electrostatic properties, thereby improving fill rates and package yield.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If non-foaming porous sound absorbing materials are used in the speaker module, then acoustic performance is improved, but electrostatic problems occur leading to low fill rates and packaging issues

Engineering Contradiction:

Improveacoustic performanceVSAvoidelectrostatic problems

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies antistatic treatment to convert the harmful electrostatic effect into a beneficial state. By treating the housing and/or sound-absorbing particles with antistatic agents or conductive materials, the harmful static electricity accumulation is eliminated, allowing the porous sound absorbing materials to achieve high fill rates (90% or above) without packaging issues, thus converting the electrostatic problem into a solved state that enables full utilization of the sound absorbing material's acoustic benefits

Inventive Principle:

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

2Reliability

If non-foaming sound absorbing particles are filled into the housing, then acoustic performance can be improved, but the fill rate is low due to electrostatic repulsion

Engineering Contradiction:

Improveacoustic performanceVSAvoidfill rate

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The antistatic treatment converts the harmful electrostatic repulsion between particles into a neutral or attractive state. By applying antistatic agents to the housing and/or particles, or using conductive materials, the electrostatic barriers are removed, enabling particles to pack densely with fill rates reaching 90% or above, thus converting the filling difficulty into efficient particle accumulation

Inventive Principle:

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

3Ease of manufacture

If conventional sound absorbing materials are used, then manufacturing is simple, but they cannot meet the acoustic performance requirements of modern thin and light wearable devices

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidacoustic performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent creates a composite structure by combining conventional sound absorbing materials with antistatic treatments or conductive materials. This composite approach maintains the manufacturing simplicity of conventional materials while adding the electrostatic control functionality, enabling the material to meet both the acoustic performance requirements of thin and light devices and the ease of manufacture constraint

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the surface properties of the sound absorbing materials through antistatic treatment or conductive coating. This parameter change (adding electrical conductivity or antistatic properties) transforms the material's interaction with electrostatic fields, enabling high fill rates and good acoustic performance without changing the fundamental sound absorbing mechanism or complicating the manufacturing process significantly

Inventive Principle:

Principle #35Parameter changes

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 antistatic treatment significantly increases the fill rate of sound-absorbing particles, enhances acoustic performance, and reduces packaging issues, resulting in improved durability and cost-effectiveness of the speaker module.

Implementation Method 1

an antistatic material is added into a material of the housing, or the antistatic material is coated on a surface of the housing... the non-foaming sound absorbing material itself is a porous material and has a high specific surface area, therefore static electricity is easily generated when the non-foaming sound absorbing material comes into contact with air

Methodology Applied

Scientific EffectElectrostatic discharge: Electrostatic Discharge

Implementation Method 2

surfaces of the sound-absorbing particles are coated with electric inductive metal films or sprayed with the antistatic agent

Methodology Applied

Scientific EffectElectrostatic induction: Electrostatic Induction

Data Source

PatentUS10567869B2Sound-absorbing component and speaker module applying the sound-absorbing component

Publication Date: 2020.02.18 GOERTEK INC

AI summary

Disclosed is a sound-absorbing component, comprising a housing and sound-absorbing particles filled in the housing. An antistatic material is added to the materials from which the housing is made, or the antistatic material is coated on the surface of the housing. Also disclosed is a speaker module applying the sound-absorbing component. The sound-absorbing component of the present invention greatly increases the fill rate of the sound-absorbing particles in the housing, thus allowing the space of the rear acoustic cavity of the speaker module applying the sound-absorbing component to be fully utilized, and allowing the sound-absorbing particles to fully exert the effects thereof in improving the acoustic properties of the speaker module.