Bone Conduction Speaker Dual-Plate Structure for Crack Resistance
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Solution Overview
Problem
Bone conduction speakers face issues with vibration transmission plates cracking due to deviation from the expected vibration direction, leading to potential collisions with the housing or coil, which affects structural reliability.
Innovation Solution
The speaker design incorporates two vibration transmission plates spaced apart along the vibration direction, with symmetrical or asymmetrical projections, to constrain the magnetic circuit assembly's vibration and reduce flipping, enhancing fatigue resistance and preventing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single vibration transmission plate is used, then the structure is simple, but the plate is prone to cracking due to deviation from expected vibration direction
Solution Approach 1:
The single vibration transmission plate is divided into two separate plates: a first vibration transmission plate and a second vibration transmission plate. This segmentation distributes the vibration transmission function across multiple components, reducing the stress concentration and fatigue resistance demands on each individual plate, thereby preventing cracking while maintaining structural simplicity.
Solution Approach 2:
The first and second vibration transmission plates are positioned at different locations relative to the magnetic circuit assembly, with the first plate located at a first position and the second plate at a second position. This local distribution of vibration transmission functions ensures that deviations in vibration direction are accommodated without causing stress concentration at a single point, improving overall reliability.
2Reliability
If the vibration transmission plate is made more robust to prevent cracking, then reliability improves, but the device complexity increases
Solution Approach 1:
Rather than making a single plate more robust, the system segments the vibration transmission function into two separate plates. This approach achieves improved reliability through distribution rather than through increased individual component size or complexity, maintaining overall structural simplicity.
Solution Approach 2:
The invention introduces a spatial dimension by positioning the first and second vibration transmission plates at different locations (first position and second position) relative to the magnetic circuit assembly. This dimensional arrangement provides redundancy and distributes mechanical stress, improving reliability without requiring each plate to be overly robust or complex.
3Productivity
If the magnetic circuit assembly is allowed to vibrate freely, then acoustic output is enhanced, but collisions with housing or coil occur
Solution Approach 1:
The first and second vibration transmission plates act as intermediaries between the magnetic circuit assembly and the housing/coil structure. These plates transmit vibrations while their spatial arrangement and positioning assembly constrain the magnetic circuit assembly's movement, preventing direct collisions with the housing or coil while maintaining acoustic output.
Solution Approach 2:
The positioning assembly pre-positions the first and second vibration transmission plates at specific locations before the magnetic circuit assembly vibrates. This preliminary arrangement ensures that the plates are already in place to constrain the assembly's movement and prevent collisions during vibration, while still allowing sufficient freedom for acoustic output.
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 dual-vibration transmission plate design significantly improves the speaker's structural reliability by extending the service life and ensuring consistent acoustic output by minimizing plate fractures and collisions.
Implementation Method 1
the magnetic circuit assembly vibrates relative to the support portion
Implementation Method 2
the vibrations are transmitted to auditory nerves of a user through a human skin, subcutaneous tissues, and bones
Data Source
AI summary
A speaker is provided. The speaker includes: a support portion, a magnetic circuit assembly, and a positioning assembly. The magnetic circuit assembly is connected to the support portion through the positioning assembly, and the magnetic circuit assembly vibrates relative to the support portion; and the positioning assembly includes two vibration transmission plates spaced apart in a vibration direction of the magnetic circuit assembly, and projections of the two vibration transmission plates along the vibration direction are symmetrical with each other.