Bone Conduction Speaker Sound Guiding Holes for Leakage Reduction
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Solution Overview
Problem
Bone conduction speakers experience sound leakage due to vibrations of the housing, which generates unwanted air sound, compromising privacy and disturbing others, and existing solutions like dual magnetic structures are inadequate in reducing leakage while increasing speaker volume and weight.
Innovation Solution
Incorporating sound guiding holes in the housing to guide sound waves inside the speaker, where they interfere with leaked sound waves, reducing their amplitude and minimizing sound leakage without increasing volume or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If sound guiding holes are added to the housing, then sound leakage is reduced, but device complexity increases
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 paths that guide sound waves from specific locations (such as the transducer area) to designated exit points, thereby controlling and reducing unwanted sound leakage while maintaining structural integrity.
Solution Approach 2:
The sound guiding holes act as intermediary structures that mediate between the internal sound generation area and the external environment. By introducing these intermediate acoustic channels, the patent controls the propagation path of sound waves, allowing them to be directed through specific routes rather than leaking freely, thus reducing harmful sound radiation.
2Object-generated harmful factors
If dual magnetic structure is used to reduce sound leakage, then sound leakage is reduced, but speaker volume and weight increase
Solution Approach 1:
The patent extracts the sound control function from the magnetic structure and relocates it to the housing structure through sound guiding holes. By separating the acoustic control mechanism from the magnetic components, the design achieves sound leakage reduction without requiring additional magnetic elements, thereby avoiding increases in volume and weight associated with dual magnetic structures.
Solution Approach 2:
The patent replaces the mechanical approach of using dual magnetic structures (which rely on magnetic field interactions and physical components) with an acoustic approach using sound guiding holes in the housing. This substitution eliminates the need for additional magnetic components and their associated volume and weight, while still achieving effective sound leakage control through acoustic path management.
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 sound guiding holes effectively reduce sound leakage by up to 20 dB in specific frequency ranges, maintaining speaker reliability and cost-effectiveness.
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.


