Magnetic Sensor Wiring Simplification via Intersecting Element Arrangement
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Solution Overview
Problem
The complexity of wiring structures in magnetic sensors increases with the number of magnetic detection elements per unit area, making it challenging to simplify the electrical connections while maintaining sensitivity.
Innovation Solution
A magnetic sensor design featuring a plurality of magnetic detection elements, yokes, and shields, where the elements are arranged in intersecting directions, allowing for simplified wiring by positioning yoke pairs and shield pairs to facilitate efficient electrical connections without the need for complex wiring configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of magnetic detection elements per unit area is increased to improve sensitivity, then measurement precision is improved, but device complexity increases due to complicated wiring structure
Solution Approach 1:
The patent combines multiple magnetic detection elements into a bridge circuit configuration where four magnetoresistive elements are arranged in four arms. This merging approach allows the elements to work together to detect magnetic fields while sharing common wiring paths, thereby improving sensitivity through increased element density without proportionally increasing wiring complexity.
Solution Approach 2:
The patent employs asymmetric positioning of yokes and shields relative to the magnetic detection elements. The yokes are positioned to concentrate magnetic flux specifically toward certain elements, while shields are placed to block interference from specific directions. This asymmetric arrangement optimizes the magnetic field distribution to enhance sensitivity without requiring symmetric, complex wiring for each element.
2Measurement precision
If magnetic detection elements are arranged to receive magnetic field components in the same direction, then measurement precision is improved, but ease of operation deteriorates due to complicated electrical connections
Solution Approach 1:
The patent designs the bridge circuit so that the same wiring structure serves multiple functions: it provides electrical connections for all four magnetoresistive elements, establishes the differential measurement configuration, and enables temperature compensation. This multi-functionality allows accurate magnetic field detection with simplified wiring compared to individual connections for each element.
Solution Approach 2:
The patent segments the bridge circuit into four distinct arms, each containing a magnetoresistive element with its own yoke and shield configuration. This segmentation allows each element to be optimized for receiving magnetic field components in the same direction while maintaining independent control and simplified collective wiring through the bridge configuration.
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 enables a more compact and efficient magnetic sensor layout with increased sensitivity by allowing for a higher number of magnetic detection elements per unit area without complicating the wiring structure.
Implementation Method 1
a magnetic sensor including a soft magnetic body that receives a magnetic field to be detected and outputs a magnetic field component in a desired direction
Implementation Method 2
As the magnetic detection elements, magnetoresistive elements are used, for example
Data Source
AI summary
A magnetic sensor includes a plurality of MR elements, a plurality of yokes each including a portion long in a first direction, and a plurality of shields each including a portion long in a second direction. The plurality of MR elements include a plurality of first specific elements. The plurality of yokes include a plurality of yoke pairs each including one of the plurality of first specific elements. The plurality of shields include a plurality of shield pairs each with one of the plurality of first specific elements therebetween. The plurality of first specific elements are arranged in a direction intersecting both the first direction and the second direction.