Sound Generating Device Dome With Air-Permeable Isolating Piece

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Solution Overview

Problem

Existing sound generating devices in portable electronic products face issues with external foreign matters blocking or liquid entering through small pressure relief ports, leading to reduced reliability and poor acoustic performance.

Innovation Solution

A sound generating device design featuring a dome with stacked air-permeable and moisture-isolating layers, which communicates with the inner sound cavity through strategically positioned through holes, ensuring air permeability and moisture isolation while maintaining air pressure balance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a small pressure relief port is used, then the air pressure balance is achieved, but external foreign matters block the port or liquid enters the inner sound cavity

Engineering Contradiction:

Improvereliability of vibrating and generating soundVSAvoidblocking by foreign matters or liquid entry

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The pressure relief function is segmented into multiple pathways: the original pressure relief port and additional through-holes formed in the dome structure. This segmentation allows air pressure balance while distributing the risk of blocking across multiple openings, and the isolating piece covers these holes to prevent liquid and foreign matter entry while permitting air passage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

An air-permeable isolating piece is introduced as an intermediary element that covers the through-holes in the dome. This isolating piece acts as a mediator that allows air to pass through (maintaining pressure balance) while blocking liquid and foreign matters from entering the inner sound cavity, thus resolving the contradiction between pressure relief and protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the pressure relief port size is increased, then liquid entry is prevented, but foreign matters may still block the port and acoustic performance deteriorates

Engineering Contradiction:

Improveliquid entry preventionVSAvoidacoustic performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The air-permeable isolating piece serves as an intermediary that enables the through-holes to be larger than the original pressure relief port (preventing liquid entry) while still blocking foreign matters. The isolating piece material allows air passage for acoustic performance while providing physical barrier properties against contaminants.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The isolating piece is made of air-permeable (porous) material that allows air to pass through while blocking liquid and foreign matters. This porous structure enables larger opening sizes for better liquid resistance while maintaining acoustic performance through controlled air permeability.

Inventive Principle:

Principle #31Porous materials

3Reliability

If a protective structure is added to prevent foreign matter blocking, then reliability improves, but device complexity increases

Engineering Contradiction:

Improveoperational reliabilityVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The protective function is merged with the existing dome structure by forming through-holes directly in the dome and integrating the isolating piece into the dome assembly. This merging approach adds protection against foreign matter blocking while minimizing additional structural complexity by utilizing and enhancing existing components rather than adding separate protective mechanisms.

Inventive Principle:

Principle #5Merging (Combining)

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 design enhances the reliability and acoustic performance by preventing external moisture entry and ensuring smooth air leakage, thus stabilizing the sound generating device's operation.

Implementation Method 1

an air-permeable isolating piece sandwiched between the first body layer and the second body layer... the air-permeable isolating piece completely covers the second through hole and the third through hole simultaneously

Methodology Applied

Scientific EffectPermeation: Permeation

Implementation Method 2

air-permeable isolating piece... preventing external moisture entry while ensuring smooth air leakage

Methodology Applied

Scientific EffectHydrophobe: Hydrophobe

Data Source

PatentUS11290806B2Sound generating device

Publication Date: 2022.03.29 AAC TECHNOLOGIES PTE LTD

AI summary

The present disclosure provides a sound generating device, which includes a frame, a vibration system, and a magnetic circuit system. The vibration system includes a membrane and a dome. The membrane includes a vibrating part, a suspension, a fixing part, and a first through hole, the frame, the membrane, and the magnetic circuit system form an inner sound cavity communicated with the first through hole. The dome is fixed to the vibrating part, and includes a first body layer, a second body layer, and an air-permeable isolating piece sandwiched between the first body layer and the second body layer. The first body layer defines a second through hole communicating with the first through hole, the second body layer defines a third through hole communicating with the second through hole. The air-permeable isolating piece covers the second through hole and the third through hole.