Bone Conduction Speaker Clamp Structure Against Magnet Loosening
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Solution Overview
Problem
Existing speaker assemblies face issues with structural instability and loosening, leading to potential failure of the transducer's conversion function, which affects reliability and service life.
Innovation Solution
A bone conduction speaker assembly with a clamp that clamps on the outer end surfaces of a magnetic circuit system, using a U-shaped abutment and connection portions to restrict relative displacement between annular magnets, enhancing structural stability and preventing loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the magnetic circuit system uses stacked annular magnets to achieve compact structure, then the volume is reduced, but the structural stability deteriorates due to relative displacement between magnets
Solution Approach 1:
The magnetic circuit system is segmented into multiple stacked annular magnets with alternating polarity arrangements. This segmentation allows for compact volume while the alternating polarity creates magnetic attraction between adjacent magnets, preventing relative displacement and maintaining structural stability during vibration.
Solution Approach 2:
A clamp structure is introduced as an intermediary component to mechanically connect and constrain the stacked annular magnets. The clamp prevents relative displacement between magnets along the axial direction, ensuring structural stability while allowing the compact stacked configuration to be maintained.
2Device complexity
If the transducer structure is simplified to reduce device complexity, then manufacturing becomes easier, but reliability deteriorates due to loosening and potential failure
Solution Approach 1:
The clamp is designed to pre-constrain the stacked annular magnets before operation begins. This preliminary action prevents relative displacement and loosening during subsequent vibration and operation, ensuring reliable transducer function without requiring complex additional restraint mechanisms.
Solution Approach 2:
The patent replaces complex mechanical restraint systems with a simplified clamp structure that uses magnetic attraction between alternating polarity magnets combined with minimal mechanical constraint. This substitution maintains reliability while reducing overall device complexity.
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 clamp design reduces the likelihood of loosening and improves structural stability, reliability, and service life of the transducer by restricting relative displacement between annular magnets.
Implementation Method 1
the vibration transmission sheet connects the magnetic circuit system and the support to elastically suspend the magnetic circuit system at a periphery of the support
Implementation Method 2
the coil is disposed on the support and located within the magnetic circuit system
Implementation Method 3
adjacent annular magnets in the at least two annular magnets are arranged to repel each other along the axial direction
Implementation Method 4
the clamp is configured to clamp two outer end surfaces of the magnetic circuit system away from each other along the axial direction
Data Source
AI summary
Speaker assemblies and earphones are provided. The speaker assembly includes a bone conduction speaker. The bone conduction speaker includes a transducer, and the transducer includes a clamp and a magnetic circuit system. The magnetic circuit system includes at least two annular magnets. The at least two annular magnets are stacked along an axial direction of the magnetic circuit system, and adjacent annular magnets in the at least two annular magnets are arranged to repel each other along the axial direction. The clamp is configured to clamp two outer end surfaces of the magnetic circuit system away from each other along the axial direction.