Speaker Box Foamed Plastic Absorption Layer

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Solution Overview

Problem

Existing speaker boxes for smart mobile devices suffer from high-frequency resonance and sound distortion due to the amplification of noise by the front cavity, which is exacerbated by the inconsistency between the soundproof sponge and the housing, limiting the effectiveness of sound absorption.

Innovation Solution

A speaker box with a sound absorption layer made of foamed plastic, integrally formed with the housing via injection molding or overmolding, which minimizes noise amplification by forming a consistent and flexible sound absorption structure across the front cavity and sound transmitting channel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If soundproof sponge is filled in the front cavity, then sound energy absorption is improved, but the inconsistency between soundproof sponge and housing increases manufacturing complexity

Engineering Contradiction:

Improvesound energy absorptionVSAvoidmanufacturing complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent integrates the sound absorption layer directly into the housing structure through injection molding, merging two previously separate components (housing and soundproof sponge) into a single integrated part. This eliminates the attachment difficulties and manufacturing complexity associated with assembling separate components while maintaining sound absorption functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses foamed plastic material that combines the structural function of the housing with the sound absorption function of the soundproof sponge. This composite approach allows a single material to fulfill multiple functions, reducing the need for separate components and simplifying manufacturing.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If soundproof sponge is filled only in the sound transmitting channel, then manufacturing is simplified, but vibration absorption effect is limited

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidvibration absorption effect

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies the sound absorption layer to specific portions of the housing that face the front cavity, rather than uniformly throughout. This localized application targets the areas where sound absorption is most needed while maintaining manufacturing efficiency, resolving the contradiction between manufacturing simplicity and absorption effectiveness.

Inventive Principle:

Principle #3Local quality

3Loss of energy

If volume of the front cavity is increased, then resistance of sound passage is reduced, but the amplification of noise by the front cavity is exacerbated

Engineering Contradiction:

Improvesound passage resistanceVSAvoidnoise amplification

Core Design Contradiction:

Loss of energyVSObject-generated harmful factors

Solution Approach 1:

The patent converts the front cavity, which was causing noise amplification, into a beneficial structure by lining it with a sound absorption layer made of foamed plastic. This transforms the harmful noise amplification effect into a beneficial sound absorption effect, allowing the cavity to serve both acoustic functions simultaneously.

Inventive Principle:

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

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 speaker box effectively reduces noise amplification and improves acoustic performance by utilizing a foamed plastic sound absorption layer that is consistently integrated with the housing, enhancing sound absorption and manufacturing control.

Implementation Method 1

A sound absorption layer is disposed at a portion of the housing facing the front cavity. The sound absorption layer comprises a micro-porous structure which is integrally formed with the housing via injection molding.

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Implementation Method 2

the sound absorption layer is made of foamed plastic with good damping and sound absorption effects

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentUS11665472B2Speaker box

Publication Date: 2023.05.30 AAC TECHNOLOGIES PTE LTD

AI summary

A speaker box includes a housing and a speaker unit accommodated in the housing. The speaker unit includes a diaphragm configured to vibrate and sound. The diaphragm is spaced from the housing to form a front sound cavity therebetween. The speaker box further includes a sound transmitting channel communicating the front sound cavity with outside. The front sound cavity and the sound transmitting channel cooperatively form a front cavity of the speaker box. A sound absorption layer is disposed at a portion of the housing facing the front cavity. The sound absorption layer includes a micro-porous structure. When the sound wave passes through the front cavity, the sound absorption layer is capable of absorbing the resonance vibration of the front cavity in high frequency, thus suppressing the amplification of the sound distortion due to the resonance vibration of the front cavity and improving the acoustic performance of the speaker box.