Foam Insert Gas Distribution in Loudspeaker Sound Adsorber

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Solution Overview

Problem

Miniature loudspeaker devices face challenges in efficiently packaging and utilizing sound adsorber materials like zeolite in constrained back volumes, leading to reduced resonance frequency shift and potential damage due to loose particles interfering with internal components.

Innovation Solution

Incorporating a preconfigured foam insert and a permeable member to create a cavity within the back volume, allowing for effective gas exchange and secure containment of sound adsorber material, which is shaped to match the internal surfaces and facilitates efficient sound adsorption without compromising electrical components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sound adsorber material is directly inserted into the back volume, then the acoustic performance is improved, but the material can interfere with internal components and damage the device

Engineering Contradiction:

Improvedevice reliabilityVSAvoidinterference with internal components

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The back volume is segmented into two parts: a containment structure that holds the sound adsorber material and prevents it from interfering with internal components, and the remaining space that maintains acoustic performance. The containment structure acts as a separate compartment, isolating the material from sensitive areas while preserving the acoustic function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A permeable member is introduced as an intermediary element between the sound adsorber material and the internal components. This permeable member allows acoustic energy to pass through while physically containing the material and preventing direct contact with internal components, thus mediating between acoustic requirements and component protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If sound adsorber material is contained in a structured manner, then interference with internal components is prevented, but the exposed surface area for sound adsorption is reduced

Engineering Contradiction:

Improveinterference with internal componentsVSAvoidacoustic performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

A permeable member with porous structure is used to contain the sound adsorber material. The porous structure allows acoustic energy to penetrate through the containment structure and reach the sound adsorber material, maintaining effective surface area exposure while preventing the material from interfering with internal components. The porosity enables both containment and acoustic functionality.

Inventive Principle:

Principle #31Porous materials

3Reliability

If the back volume is completely filled with sound adsorber material, then the resonance frequency shift is maximized, but the packaging complexity and risk of loose particles increase

Engineering Contradiction:

Improveresonance frequency shiftVSAvoidpackaging complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The back volume is segmented into a containment structure filled with sound adsorber material and the surrounding acoustic space. This segmentation allows the material to be concentrated in specific areas where it provides maximum resonance frequency shift while preventing loose particles from spreading throughout the entire device. The containment structure manages the material in a controlled manner.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sound adsorber material is pre-configured within the containment structure before assembly. This preliminary action ensures the material is properly contained and positioned to maximize resonance frequency shift while preventing loose particles from interfering with internal components during assembly and operation.

Inventive Principle:

Principle #10Preliminary action

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

Enhances the efficiency of sound adsorber materials by increasing the exposed surface area and preventing interference with internal components, thereby improving the acoustic performance and reducing the risk of damage from loose particles.

Implementation Method 1

the preconfigured foam insert and the permeable member facilitate gas exchange between the transducer volume and the back volume

Methodology Applied

Scientific EffectGas exchange through porous material: Porosity

Implementation Method 2

sound adsorber materials disposed in the back volume of a loudspeaker device improve its sound characteristics, e.g., the wideband performance, and the apparent acoustic volume

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Data Source

PatentUS9936286B2Loudspeaker device having foam insert to improve gas distribution in sound adsorber material

Publication Date: 2018.04.03 SSI NEW MATERIAL (ZHENJIANG) CO LTD

AI summary

A loudspeaker device having housing and an acoustic transducer is disclosed. The housing has a transducer space for the acoustic transducer, and a back volume space. The back volume filled with a sound adsorber material and a foam material. The sound adsorber material in the back volume space is configured to virtually increase the size of the back volume space, and shift the resonant frequency of the back volume space. The foam material separates the sound adsorber from the transducer space and facilitates gas exchange and air flow within the back volume space and between the sound adsorber and the transducer space. The foam material is configured in different arrangements to facilitate the gas exchange and air flow.