Damping Spring With Composite Layers For Bone Conduction Transducers
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Solution Overview
Problem
Wearable bone-conduction transducers cause buzzing and irritation due to the lack of effective damping in steel springs, which leads to discomfort during audio transmission.
Innovation Solution
The use of damping steel with a rubbery inner layer and stainless steel outer layers in the springs, combined with laser welding techniques, to reduce resonant vibrations and improve user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional steel springs are used in bone-conduction transducers, then the device structure is simple and manufacturing is easy, but the springs cause buzzing and irritation due to lack of effective damping
Solution Approach 1:
The patent applies composite materials by constructing the spring from multiple layers: an inner core of damping steel and outer layers of stainless steel. This composite structure combines the high damping capability of damping steel with the corrosion resistance and structural integrity of stainless steel, thereby reducing buzzing and irritation while maintaining simple device architecture and ease of manufacturing.
2Object-affected harmful factors
If damping steel springs are used to reduce buzzing, then user comfort is improved, but the resonant frequency shifts and requires precise control
Solution Approach 1:
The patent employs parameter changes by carefully selecting and controlling the thickness of each spring layer (inner damping steel core and outer stainless steel layers). By adjusting these dimensional parameters, the resonant frequency of the spring can be precisely controlled to avoid unwanted vibrations while maintaining effective damping. The laser welding parameters are also optimized to achieve precise control over the joint properties without introducing excessive heat distortion.
3Reliability
If laser welding is used to attach damping steel springs, then welding precision and comfort are improved, but specific welding parameters must be precisely controlled
Solution Approach 1:
The patent applies parameter changes by optimizing specific laser welding parameters including laser power, welding speed, and focal position. These parameters are carefully controlled to achieve high welding quality and reliability while preventing defects such as burn-through or insufficient penetration. The inner diameter of the spring and the position of the laser beam are precisely coordinated to ensure consistent weld quality across production batches.
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
This solution effectively reduces buzzing and irritation by shifting the resonant frequency and decreasing vibration amplitude, enhancing the user experience and freeing up processing power for other functions.
Implementation Method 1
an electromagnet having a conductive coil. The conductive coil is configured to be driven by an electrical input signal to generate magnetic fields
Implementation Method 2
The pair of cantilevered arms are formed from damping steel... effectively reduces buzzing and irritation by shifting the resonant frequency and decreasing vibration amplitude
Implementation Method 3
buzzing and irritation may be reduced by laser welding the damping steel springs using specific parameters
Data Source
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AI summary
Embodiments disclosed in the present disclosure relate to vibration transducers. Such a transducer includes an electromagnet having a conductive coil. The conductive coil is configured to be driven by an electrical input signal to generate magnetic fields. The transducer further includes a magnetic diaphragm that is configured to mechanically vibrate in response to the generated magnetic fields. Additionally, the transducer includes a pair of cantilevered arms formed from damping steel. The cantilevered arms couple the magnetic diaphragm to a frame. The magnetic diaphragm vibrates with respect to the frame when the electromagnet is driven by the electrical input signal. Additionally, the pair of flexible support arms are connected to opposing sides of the magnetic diaphragm.