Bone Conduction Speaker Housing With Sound-Guiding Holes for Leakage Control

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Solution Overview

Problem

Bone conduction speakers experience sound leakage due to vibrations of the housing, which generates air-borne sound, compromising privacy and disturbing others, and existing solutions like dual magnetic structures increase speaker volume, weight, and complexity.

Innovation Solution

Incorporating sound guiding holes in the housing to guide sound waves inside the speaker, utilizing principles of sound interference to reduce sound leakage by interfering with leaked sound waves, without increasing volume or weight.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-generated harmful factors

If sound guiding holes are added to the housing, then sound leakage is reduced, but device complexity increases

Engineering Contradiction:

Improvesound leakageVSAvoidhousing structure complexity

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The housing is segmented by adding sound guiding holes that divide the internal acoustic space into distinct regions. These holes create separate acoustic pathways that guide sound waves from specific sources (vibration board, transducer) to predetermined exit points, thereby controlling sound leakage without requiring complete structural redesign.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Sound guiding holes act as intermediary structures between the internal sound sources and the external environment. These holes serve as controlled mediators that allow sound waves to pass through the housing in predetermined directions, interfering with and reducing unwanted sound leakage while maintaining device functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-generated harmful factors

If dual magnetic structure is used to reduce sound leakage, then sound leakage is reduced, but volume and weight increase

Engineering Contradiction:

Improvesound leakageVSAvoidspeaker volume

Core Design Contradiction:

Object-generated harmful factorsVSVolume of moving object

Solution Approach 1:

The invention extracts the sound leakage control function from complex magnetic structures and implements it through simpler acoustic pathways created by sound guiding holes. By removing the need for dual magnetic structures and focusing on acoustic field manipulation through strategically placed holes, the design achieves sound leakage reduction with minimal impact on volume and weight.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces mechanical/structural solutions (dual magnetic structures, complex housing designs) with acoustic field-based solutions. By using sound wave interference and guidance through holes in the housing, the system achieves sound leakage control through acoustic principles rather than mechanical complexity, thereby reducing volume and weight.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Object-generated harmful factors

If dual magnetic structure is used to reduce sound leakage, then sound leakage is reduced, but device complexity increases

Engineering Contradiction:

Improvesound leakageVSAvoidmagnetic structure complexity

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The invention converts the harmful effect of sound waves generated by vibration into a beneficial control mechanism. By allowing sound waves to pass through sound guiding holes and interfere with leakage paths, the previously harmful acoustic energy is transformed into a useful tool for active sound leakage cancellation, eliminating the need for complex magnetic structures.

Inventive Principle:

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

Solution Approach 2:

The invention replaces complex magnetic structures with acoustic field manipulation. Instead of using magnetic components to control sound leakage, the system uses sound guiding holes to direct and interfere with sound waves, achieving the same goal through acoustic principles and significantly reducing structural complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Effectively reduces sound leakage by up to 20 dB in specific frequency ranges, maintaining speaker performance and simplicity.

Implementation Method 1

utilizing principles of sound interference to reduce sound leakage by interfering with leaked sound waves

Methodology Applied

Scientific EffectSound wave interference: Interference

Data Source

PatentUS20250350890A1Systems and methods for suppressing sound leakage

Publication Date: 2025.11.13 SHENZHEN SHOKZ CO LTD

AI summary

A speaker comprises a housing, a transducer residing inside the housing, and at least one sound guiding hole located on the housing. The transducer generates vibrations. The vibrations produce a sound wave inside the housing and cause a leaked sound wave spreading outside the housing from a portion of the housing. The at least one sound guiding hole guides the sound wave inside the housing through the at least one sound guiding hole to an outside of the housing. The guided sound wave interferes with the leaked sound wave in a target region. The interference at a specific frequency relates to a distance between the at least one sound guiding hole and the portion of the housing.