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
Implementing 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
Engineering Contradiction Analysis
1Object-generated harmful factors
If dual magnetic structure and double-frame are used to reduce sound leakage, then sound leakage is reduced, but speaker volume increases
Solution Approach 1:
The patent extracts the sound leakage reduction function from a complex dual magnetic structure and double-frame system, implementing it instead through a single magnetic structure with a specifically designed sound isolation chamber that acoustically isolates the rear surface of the vibration board, achieving the same effect with simpler geometry and smaller volume
Solution Approach 2:
The patent introduces a sound isolation chamber as an intermediary acoustic space between the vibration board and the external environment. This chamber acts as a mediator that captures and contains the sound waves generated at the rear surface of the vibration board, preventing them from propagating outward and thus reducing sound leakage without requiring additional external frames
2Object-generated harmful factors
If dual magnetic structure and double-frame are used to reduce sound leakage, then sound leakage is reduced, but speaker weight increases
Solution Approach 1:
The patent removes the need for a dual magnetic structure by implementing sound isolation through a single magnetic structure combined with an acoustically isolated chamber, extracting the sound leakage control function from the magnetic components and relocating it to the chamber structure, thereby reducing overall weight
Solution Approach 2:
The sound isolation chamber serves as an intermediary structure that provides sound leakage reduction without requiring additional magnetic components or frames. By using the chamber as the primary sound isolation mechanism, the patent eliminates redundant structural elements that would contribute to weight
3Object-generated harmful factors
If dual magnetic structure and double-frame are used to reduce sound leakage, then sound leakage is reduced, but device complexity increases
Solution Approach 1:
The patent extracts the sound leakage reduction function from the complex dual magnetic structure and double-frame assembly, implementing it instead through a simplified single magnetic structure with an integrated sound isolation chamber, thereby reducing the number of components and assembly steps
Solution Approach 2:
The patent merges the sound isolation function with the existing single magnetic structure and housing design. The sound isolation chamber is integrated into the housing structure, combining multiple functions (magnetic field generation, structural support, and sound isolation) into a unified design rather than requiring separate dual magnetic structures and frames
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 10-20 dB in specific frequency ranges, maintaining speaker performance and simplicity.
Implementation Method 1
The transducer 122 may transduce electrical signals to mechanical vibrations
Implementation Method 2
The vibration board 121 may stretch out from the opening of the housing 110 and contact with human skin to pass vibrations to auditory nerves through human tissues and bones
Implementation Method 3
a portion of the vibrating board 121 and the housing 110 that are not in contact with human issues may nevertheless push air. Air sound may thus be generated by the air pushed by the portion of the vibrating board 121 and the housing 110
Implementation Method 4
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.