Flexible Compression Filter for Adjustable Noise-Reducing Earplugs

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Solution Overview

Problem

Existing noise-reducing earplugs have fixed noise-reducing modes, failing to adjust to varying noise levels in different environments, leading to unsatisfactory user experiences.

Innovation Solution

A filter and noise-reducing earplug design featuring a shell, flexible sound filtering block, and adjustment pressing plate, allowing the adjustment of the compression cavity volume to vary the sound filtering effect by pressing the flexible block and using a baffle to control sound inlet holes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a fixed noise-reducing filter is used, then the structure is simple, but the adaptability to different noise environments is poor

Engineering Contradiction:

Improvenoise-reducing effect adjustmentVSAvoidfilter structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The filter block is designed to be flexible rather than rigid, allowing it to be compressed and expanded. The compression cavity enables the filter block to change its volume and density dynamically, transforming a static filter into an adjustable one that can adapt to different noise environments.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The noise-reducing effect is adjusted by changing the physical parameters of the filter block, specifically its volume and density. By compressing the filter block to reduce its volume and increase its density, the noise-reducing effect is enhanced. This parameter change approach allows continuous adjustment of the filter's performance.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If the filter block is compressed to increase noise reduction, then the sound filtering effect improves, but the device complexity increases

Engineering Contradiction:

Improvenoise filtering effectVSAvoidcompression mechanism

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The filter system is segmented into distinct functional components: the filter block, the compression cavity, and the pressing plate. This segmentation allows each component to perform its specific function independently while working together to achieve the overall noise-reduction goal, making the compression mechanism more manageable and less complex.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The compression cavity acts as an intermediary between the pressing plate and the filter block. It provides a controlled space for compression, allowing the pressing plate to apply force uniformly to the filter block while maintaining a simple overall structure. The cavity mediates the compression action, making the system easier to implement.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If a flexible sound filtering block is used, then the noise-reducing effect can be adjusted, but the manufacturing precision requirements increase

Engineering Contradiction:

Improveadjustable noise reductionVSAvoidcompression cavity dimensions

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The filter block is designed with non-uniform density distribution, being denser at the compression end and less dense at the other end. This local quality variation allows the filter to maintain effective noise reduction even when compressed, as the denser region provides the primary filtering capability while the less dense region allows for compression flexibility.

Inventive Principle:

Principle #3Local quality

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

Enables users to selectively adjust noise reduction levels based on their environment, providing customizable noise filtering effects.

Implementation Method 1

a flexible sound filtering block, made of a flexible porous material such as a foam rubber material, a sponge material, or a rubber material, to filter sound

Methodology Applied

Scientific EffectAcoustic absorption: Acoustic Absorption

Implementation Method 2

the density of the flexible sound filtering block is adjusted by operating the adjustment pressing plate to press the flexible sound filtering block

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentUS12383433B2Filter and noise-reducing earplug

Publication Date: 2025.08.12 MENGBAOLONG TECH CO LTD

AI summary

Disclosed are a filter and a noise-reducing earplug, the noise-reducing earplug includes a filter, and the filter includes a shell, a flexible sound filtering block, and an adjustment pressing plate, wherein the shell is provided with a mounting recess and a sound outlet hole communicating with the mounting recess, the adjustment pressing plate is mounted in the mounting recess and forms a compression cavity with the mounting recess, the adjustment pressing plate is provided with sound inlet holes, the flexible sound filtering block is mounted in the compression cavity, the adjustment pressing plate contacts an end of the flexible sound filtering block away from the sound outlet hole, and the adjustment pressing plate is configured to adjust a volume of the compression cavity. The noise-reducing earplug provided in the present disclosure may adjust the noise-reducing effect; and a user may selectively filter external noise to different degrees as needed.