Head-Mounted Device High Permeability Spacer Reduces Vibration Noise
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Solution Overview
Problem
In head-mounted devices, the close proximity of wiring to acoustical devices leads to vibration noise due to the interaction of magnetic fields and current flows, affecting user experience.
Innovation Solution
A head-mounted device design incorporating a spacer layer made of high magnetic permeability material between the acoustical device and the wire harness, which reduces the magnetic field intensity and thereby minimizes vibration noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wire harness is disposed close to the acoustical device to save space, then the device complexity is reduced, but vibration noise is generated due to magnetic field interaction
Solution Approach 1:
A spacer layer made of high magnetic permeability material is introduced as an intermediary between the wire harness and the acoustical device. This spacer layer acts as a magnetic shield that guides and concentrates magnetic flux, preventing it from interacting with the wire harness and causing vibration noise, while still allowing the wire harness to be positioned close to the acoustical device for space efficiency.
2Object-affected harmful factors
If the spacer layer is made of high magnetic permeability material, then the magnetic field intensity is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent changes the magnetic permeability parameter of the spacer layer material to a high value, which fundamentally alters the magnetic field distribution and reduces the harmful magnetic field intensity. This parameter change allows for more flexible positioning tolerances during manufacturing, as the high magnetic permeability material naturally guides and concentrates flux regardless of minor positioning variations.
3Ease of operation
If the battery is separated from the host unit at the front end, then the wearing comfort is improved, but the power supply wiring becomes more complex
Solution Approach 1:
The high magnetic permeability spacer layer serves as a magnetic shield that protects the power supply wiring from magnetic field interference. This allows the wiring to be routed more flexibly through the wearing apparatus without being constrained by magnetic interference issues, thereby simplifying the overall power supply wiring configuration while maintaining the separated battery arrangement for improved wearing comfort.
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 use of a high magnetic permeability spacer layer effectively reduces the vibration noise caused by the interaction of magnetic fields and current flows, enhancing the user experience by minimizing unwanted noise.
Implementation Method 1
the spacer layer is a high magnetic permeability material layer... effectively reduces the vibration noise caused by the interaction of magnetic fields and current flows
Implementation Method 2
vibration noise due to the interaction of magnetic fields and current flows
Data Source
Figure 1A~1B
Figure 1C~3
Figure 4~6
AI summary
A head-mounted device (100), comprising: a host (10); a wearable device (20), the wearable device (20) being connected to the host (10), an acoustic component (50) and a wire harness (40) being provided in the wearable device (20), and the wire harness (40) being used to supply power to the host (10); the wearable device (20) further comprises a spacer layer (22), the spacer layer (22) being located between the acoustic component (50) and the wire harness (40), and the spacer layer (22) being a high-magnetic permeability material layer. The head-mounted device (100) may affect the distribution of magnetic lines of force around the wire harness (40) under the attraction of the high-magnetic permeability of the spacer layer (22), which greatly reduces the magnetic field intensity near the wire harness (40), and reduces the changing amperage experienced by the wire harness (40), thereby reducing vibration amplitude of the wire harness (40) and the problem of noise generated by vibration of the wire harness (40). After the influence of the wire harness (40) on the acoustic component (50) is reduced, the probability that the acoustic component (50) generates vibration noise is also reduced.