Magnetic Sensor With Shielding Leg Parts
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Solution Overview
Problem
Magnetic sensors with magnetic members offset to detection elements are susceptible to environmental magnetic fields, which act as noise, reducing detection sensitivity.
Innovation Solution
A magnetic sensor design featuring multiple detection elements covered by a magnetic member with protruding leg parts, where the magnetic field is collected and directed to the detection elements while the environmental magnetic field is bypassed, using a soft magnetic material for the member to enhance shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetic member is disposed offset to the magnetic detection element, then the direction of magnetic flux is bent enabling high-sensitivity detection, but a large part of the magnetic detection element is exposed from the magnetic member making the sensor subject to environmental magnetic field noise
Solution Approach 1:
The magnetic member transitions from a conventional planar offset configuration to a three-dimensional structure with a main body portion extending over the detection element and leg portions anchoring to the substrate. This dimensional transformation allows the magnetic member to simultaneously achieve flux concentration at the detection element and environmental noise shielding, resolving the contradiction between sensitivity enhancement and noise protection.
Solution Approach 2:
The magnetic member acts as an intermediary structure that mediates between the magnetic detection element and the environmental magnetic field. By positioning the detection element within the main body portion, the magnetic member serves as both a flux-conducting pathway and a shielding barrier, allowing useful magnetic flux to pass through while blocking harmful environmental magnetic fields from reaching the detection element.
2Object-affected harmful factors
If the magnetic detection element is covered by the magnetic member main body portion, then environmental magnetic field influence is reduced, but the structure complexity increases with multiple components
Solution Approach 1:
The magnetic member is segmented into functionally distinct portions: a main body portion that covers and shields the detection element, and leg portions that anchor to the substrate and conduct magnetic flux. This segmentation allows each portion to be optimized for its specific function while maintaining overall structural integrity and manufacturability.
Solution Approach 2:
The magnetic member is designed as a multi-functional component that simultaneously provides magnetic flux conduction, mechanical anchoring, and environmental noise shielding. By integrating these multiple functions into a single magnetic member structure, the design avoids the complexity of separate components while achieving comprehensive performance.
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 design effectively reduces the influence of environmental magnetic fields on the sensor, improving detection sensitivity and allowing for differential signal generation while maintaining a wide magnetic field coverage.
Implementation Method 1
a magnetic member provided on a second plane parallel to the first plane... The magnetic member includes a first main body part forming a first space between itself and the second plane and a first leg part protruding from the first main body part and fixed to the second plane... a magnetic field to be detected is collected in the first leg part
Implementation Method 2
the first magnetic detection element is covered with the first main body part... allowing an environmental magnetic field acting as noise to bypass the first magnetic detection element through the first main body part. Thus, influence of the environmental magnetic field can be reduced
Data Source
AI summary
An object of the present invention is to provide a magnetic sensor less subject to an environmental magnetic field. A magnetic sensor includes magnetic detection elements MR1 to MR4 positioned on a first plane P1 and a magnetic member 30A provided on a second plane P2. The magnetic member 30A includes first and second leg parts 41 and 42 and a first main body part 51 positioned between the first and second leg parts 41 and 42 so as to form a first space 61 between itself and the second plane P2. The magnetic detection elements MR1 to MR4 are covered with the first main body part 51. According to the present invention, magnetic field to be detected is collected to the first and second leg parts 41 and 42, and the magnetic detection elements MR1 to MR4 are covered with the first main body part 51, thereby allowing an environmental magnetic field acting as noise to bypass the magnetic detection elements MR1 to MR4 through the first main body part 51. Thus, influence of the environmental magnetic field can be reduced.