Earphone Speaker Assembly With Core Shell Acoustic Isolation

Solution Overview

Problem

Existing earphones suffer from sound leakage and compromised sound quality due to resonance and interference between transducers and housing components.

Innovation Solution

The speaker assembly incorporates a core shell with a smaller mounting space for the transducer, which is supported by a housing assembly, featuring sound guiding holes for balanced air pressure and opposite phase sound emission to reduce leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the transducer is mounted in a large accommodation space within the housing assembly, then the transducer has sufficient mounting space, but resonance and interference occur between the transducer and housing components causing sound leakage and compromised sound quality

Engineering Contradiction:

Improvemounting space volumeVSAvoidsound leakage

Core Design Contradiction:

Volume of moving objectVSObject-generated harmful factors

Solution Approach 1:

The housing assembly is segmented into two distinct spaces: a smaller mounting space for the transducer and a larger accommodation space for other components. The core shell acts as a partition wall separating these spaces, preventing resonance and interference while providing sufficient mounting space for the transducer.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The core shell is extracted as a separate component that partitions the housing assembly into distinct functional spaces. This extraction allows the transducer to be isolated in its own mounting space, eliminating harmful resonance interactions with the larger accommodation space while maintaining adequate mounting volume.

Inventive Principle:

Principle #2Taking out (Extraction)

2Volume of moving object

If the transducer is mounted in a large accommodation space within the housing assembly, then the transducer has sufficient mounting space, but resonance and interference occur between the transducer and housing components causing compromised sound quality

Engineering Contradiction:

Improvemounting space volumeVSAvoidsound quality

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The housing assembly is segmented into two distinct spaces: a smaller mounting space for the transducer and a larger accommodation space for other components. The core shell acts as a partition wall separating these spaces, preventing resonance and interference while providing sufficient mounting space for the transducer.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The core shell is extracted as a separate component that partitions the housing assembly into distinct functional spaces. This extraction allows the transducer to be isolated in its own mounting space, eliminating harmful resonance interactions with the larger accommodation space while maintaining adequate mounting volume.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If sound guiding holes are added to the core shell and housing assembly, then air pressure balance is achieved, but the structure becomes more complex

Engineering Contradiction:

Improveair pressure balanceVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The core shell serves multiple functions: it partitions the housing assembly into separate spaces, provides mounting support for the transducer, and incorporates sound guiding holes to balance air pressure. This multi-functionality reduces the need for additional separate components, thereby limiting structural complexity while achieving air pressure balance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The sound guiding holes are integrated directly into the core shell structure, allowing it to self-regulate air pressure balance without requiring external active control mechanisms or additional complex components. The structure serves its own air pressure balancing needs through the built-in sound guiding holes.

Inventive Principle:

Principle #25Self-service

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

This design reduces sound leakage and enhances sound quality by minimizing resonance and interference, improving acoustic performance.

Implementation Method 1

the first sound guiding hole is in flow communication with an outside of the core shell through the second sound guiding hole

Methodology Applied

Scientific EffectAir pressure balance: Pressure Gradient

Implementation Method 2

the bone conduction speaker includes a core shell and a transducer, the core shell is supported by the housing assembly

Methodology Applied

Scientific EffectElectromagnetic transduction: Electromagnetic Induction

Implementation Method 3

at least a portion of the vibration transmission plate protrudes outwardly through the opening for fitting a human face

Methodology Applied

Scientific EffectBone conduction: Vibration

Data Source

PatentUS20250392857A1Speaker assemblies and earphones

Publication Date: 2025.12.25 SHENZHEN SHOKZ CO LTD

AI summary

A speaker assembly and an earphone are provided. The speaker assembly includes a housing assembly, a bone conduction speaker, and an air conduction speaker. The housing assembly includes a main housing forming an accommodation space with an open end. The bone conduction speaker includes a core shell and a transducer. The core shell is rotatably supported on the main housing and partially located in the accommodation space. The core shell is provided with a mounting space, and a volume of the mounting space is smaller than a volume of the accommodation space. The transducer is provided in the mounting space. The core shell is provided with a sound guiding hole in flow communication with the mounting space. In this way, the speaker assembly has a better acoustic performance.