Magnetic Sensor With Perforated Shielding For Noise Suppression
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Solution Overview
Problem
Magnetic sensors with magnetic layers face challenges in maintaining stable characteristics due to interference from external magnetic fields, which affects their sensitivity and noise suppression capabilities.
Innovation Solution
The design incorporates a sensing element portion with a deformable film and a magnetic layer, separated from a magnetic portion with strategically arranged holes that are wider than the sensing element but narrower than the film, allowing efficient transmission of external forces like sound waves while attenuating external magnetic fields, thereby maintaining high sensitivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic layer is used in the sensor, then the sensor can detect magnetic fields, but the sensor becomes sensitive to external magnetic field interference which degrades measurement stability
Solution Approach 1:
The sensor is divided into distinct functional regions: a sensing element portion containing the magnetic layer and deformable film, and a magnetic portion with hole patterns. This segmentation allows the magnetic portion to handle external field interference while the sensing element maintains measurement capability, resolving the contradiction between sensitivity and stability.
Solution Approach 2:
Different regions of the sensor are given different properties: the sensing element portion has high magnetic sensitivity for detection, while the magnetic portion has a hole pattern structure that provides magnetic field shielding. This local differentiation allows each region to optimize its function without compromising the other.
2Reliability
If the magnetic portion is placed close to the sensing element, then magnetic field shielding is improved, but the transmission of external forces like sound waves is blocked
Solution Approach 1:
The magnetic portion incorporates a pattern of holes creating a porous-like structure that allows mechanical force transmission while providing magnetic field shielding. The holes permit sound waves and other external forces to pass through to the sensing element, while the magnetic material surrounding the holes shields against external magnetic field interference.
Solution Approach 2:
The hole pattern in the magnetic portion acts as an intermediary structure that mediates between the need for magnetic shielding and force transmission. It allows mechanical energy to pass through while blocking magnetic field interference, enabling both functions to coexist.
3Reliability
If the sensor structure is made more complex with additional magnetic portions and hole patterns, then external magnetic field interference is reduced, but the device complexity increases
Solution Approach 1:
The magnetic portion serves multiple functions simultaneously: it provides magnetic field shielding, allows force transmission through its hole pattern, and structurally supports the sensing element. This multi-functionality reduces the need for separate components, managing complexity while achieving noise suppression.
Solution Approach 2:
The magnetic portion and hole pattern structure are combined into a single integrated component rather than separate elements. This merging achieves both magnetic shielding and force transmission functions in one structure, reducing overall device complexity while maintaining noise suppression capabilities.
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 configuration effectively suppresses external magnetic field effects, enhances sensing sensitivity, and reduces noise, enabling stable and efficient detection of external forces across a broader frequency range.
Implementation Method 1
A width of one of the plurality of first holes along a second direction is narrower than a length of the sensing element portion along the second direction and wider than a length of the first element along the second direction. The second direction crosses a first direction from the film portion toward the first element.
Implementation Method 2
a first element including a magnetic layer and being provided at the film portion
Data Source
AI summary
According to one embodiment, a sensor includes a sensing element portion and a first magnetic portion. The sensing element portion includes a supporter, a deformable film portion supported by the supporter, and a first element including a magnetic layer and being provided at the film portion. The first magnetic portion is separated from the sensing element portion. The first magnetic portion includes a plurality of first holes. A width of one of the plurality of first holes along a second direction is narrower than a length of the sensing element portion along the second direction and wider than a length of the first element along the second direction. The second direction crosses a first direction from the film portion toward the first element.