Bone Conduction Speaker Sound Leakage Reduction
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Solution Overview
Problem
Bone conduction speakers experience sound leakage due to vibrations causing air displacement, which can compromise privacy and disturb others, and existing solutions like dual magnetic structures increase weight and cost without satisfactory sealing.
Innovation Solution
Incorporating sound guiding holes in the housing of the bone conduction speaker to guide sound waves inside the device outwards, where they interfere with leaked sound waves, reducing their amplitude and minimizing sound leakage without increasing the device's volume or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a dual magnetic structure and double-frame are used to reduce sound leakage, then sound leakage is reduced to some extent, but the device's weight and cost increase
Solution Approach 1:
The patent extracts the sound wave guidance function from a complex dual magnetic structure and implements it through simple sound guiding holes in the housing, removing unnecessary magnetic components while retaining the sound leakage reduction effect
Solution Approach 2:
The patent applies sound guiding holes at specific locations on the housing to create localized sound wave interference patterns, achieving effective sound leakage reduction only where needed rather than using a complete dual-frame structure throughout
2Object-generated harmful factors
If a dual magnetic structure and double-frame are used to reduce sound leakage, then sound leakage is reduced to some extent, but the device's cost increases
Solution Approach 1:
The patent removes the expensive dual magnetic structure and replaces it with simple acoustic holes in the housing, dramatically reducing manufacturing complexity and cost while maintaining sound leakage reduction functionality
Solution Approach 2:
The patent uses simple, inexpensive housing material with integrated sound guiding holes instead of expensive magnetic components, accepting that the housing structure serves the acoustic function without requiring durable magnetic materials
3Object-generated harmful factors
If the housing is sealed to prevent sound leakage, then sound leakage is reduced, but the device's volume increases
Solution Approach 1:
Instead of sealing the housing to prevent sound leakage, the patent inverts the approach by creating controlled openings (sound guiding holes) that actively guide sound waves to interfere with and reduce leakage, achieving the opposite effect through openings rather than closures
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 effectively reduces sound leakage by up to 20 dB in specific frequency ranges, maintaining the speaker's reliability and cost-effectiveness while preventing unwanted noise dispersion.
Implementation Method 1
the air inside the housing is pushed out of the housing through the at least one sound guiding hole, interferes with the leaked sound wave, and reduces an amplitude of the leaked sound wave
Data Source
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.