Segmented Magnet Asymmetry for Bone Conduction Vibrator
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Solution Overview
Problem
Conventional bone conduction devices face issues with effective sound transmission and stability, particularly in preventing high-frequency sound leakage and ensuring broad frequency band perception, while maintaining a compact design.
Innovation Solution
A vibrator design featuring a magnet assembly with a smaller first magnet and a larger second magnet, both facing identical poles, integrated within a coil bobbin and yoke structure, which enhances magnetic flux density and vibration efficiency, and a damper configuration that allows for effective vibration propagation without sound leakage, even in enclosed cases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single large magnet is used to generate sufficient magnetic flux, then the magnetic flux density is improved, but the vibration frequency and responsiveness deteriorate
Solution Approach 1:
The magnet is divided into multiple smaller magnets (first magnet and second magnet) with identical poles facing each other. This segmentation allows the system to maintain sufficient magnetic flux density while improving vibration frequency and responsiveness, as each smaller magnet can vibrate more freely and rapidly.
2Reliability
If the case is made fully enclosed for waterproofing, then durability is improved, but vibration transmission and sound quality deteriorate
Solution Approach 1:
The case is designed with different properties in different regions: the main body is enclosed for waterproofing, while specific portions (bottom surface and side surfaces) are opened or modified to allow vibration transmission. This local differentiation enables the case to simultaneously provide waterproofing and maintain sound quality.
3Volume of moving object
If the vibrator size is reduced for compact design, then portability is improved, but magnetic flux generation and sound pressure level deteriorate
Solution Approach 1:
The magnet assembly is segmented into multiple smaller magnets arranged in a compact configuration. This segmentation enables sufficient magnetic flux generation within a reduced volume, as the combined magnetic field of multiple small magnets can be equivalent to or greater than a single large magnet while occupying less space.
Solution Approach 2:
The vibrator employs an asymmetric magnet arrangement where the first and second magnets have different sizes and positions. This asymmetric configuration optimizes the magnetic flux distribution to generate adequate sound pressure levels while maintaining a compact overall size.
4Use of energy by moving object
If the magnet volume is increased to improve magnetic flux, then the magnetic flux density is improved, but the device weight and complexity increase
Solution Approach 1:
Instead of using a single large magnet, the system employs multiple smaller magnets with identical poles facing each other. This segmentation reduces the complexity of individual magnet components while achieving the desired magnetic flux density through the combined effect of multiple magnets.
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 solution achieves robust sound pressure levels across a wide frequency range, ensuring effective cartilage conduction and preventing magnet detachment, while maintaining a compact and waterproof design.
Implementation Method 1
a coil wound around the coil bobbin
Implementation Method 2
The coil generates a magnetic field, and this magnetic field causes the magnet disposed within the coil bobbin to vibrate
Implementation Method 3
enhances magnetic flux density and vibration efficiency
Implementation Method 4
a damper supporting the yoke
Data Source
AI summary
A vibrator includes a case having a space inside, and a magnet supported in the space so as to be configured to vibrate. The magnet includes a first magnet and a second magnet disposed in such a manner that respective magnetic poles identical to each other face. The volume of the first magnet is smaller than the volume of the second magnet.