Magnetic Sensor Bridge Layout for Lower Wiring Resistance
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Solution Overview
Problem
Magnetic sensors face challenges in increasing the occupancy area of magnetoresistive elements while minimizing wiring resistance and sensor size, particularly when connecting multiple elements in series along a long yoke structure, leading to increased cost and decreased sensitivity.
Innovation Solution
A magnetic sensor design featuring parallel bridge circuits with magnetoresistive elements and yokes, where each bridge circuit is connected in parallel, allowing for increased occupancy area without increasing sensor size and reducing wiring resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the occupancy area of magnetoresistive elements is increased by arranging multiple elements along a long yoke structure, then the sensitivity of the magnetic sensor is improved, but the wiring resistance increases and the sensor size increases
Solution Approach 1:
The patent transitions from a one-dimensional linear arrangement of magnetoresistive elements along a long yoke to a two-dimensional planar arrangement using multiple yokes disposed at different positions. This dimensional change allows the sensor to achieve increased occupancy area without proportionally increasing wiring length, as elements can be connected through shorter interconnections in the planar layout rather than along a extended linear path.
Solution Approach 2:
The patent divides the single long yoke structure into multiple separate yokes (first yoke, second yoke, third yoke, fourth yoke) disposed at different positions around the magnetoresistive elements. This segmentation allows each element to be connected to its own dedicated yoke through shorter wiring paths, reducing total wiring resistance while maintaining the overall sensor area and sensitivity.
2Area of stationary object
If multiple magnetoresistive elements are connected in series along a long yoke structure, then the occupancy area is increased, but the wiring resistance increases
Solution Approach 1:
The patent employs a two-dimensional arrangement where multiple yokes are positioned at different locations (first, second, third, fourth yokes) rather than extending a single yoke linearly. This spatial distribution enables magnetoresistive elements to be connected through shorter wiring paths while achieving the same occupancy area, thereby reducing wiring resistance and improving reliability.
Solution Approach 2:
By segmenting the yoke structure into multiple separate yokes disposed at different positions, the patent reduces the total wiring length required to connect magnetoresistive elements. Each yoke serves a specific region, allowing for optimized local connections that minimize cumulative wiring resistance while maintaining the overall occupancy area.
3Measurement precision
If the number of yokes is increased to increase the occupancy area of magnetoresistive elements, then the sensitivity is improved, but the sensor size increases
Solution Approach 1:
The patent combines multiple yokes (first, second, third, fourth yokes) into a coordinated arrangement that collectively enhances the magnetic field interaction with magnetoresistive elements. This merging of multiple yoke structures achieves improved sensitivity through increased occupancy area while maintaining a compact overall sensor size, as the yokes are integrated into a unified sensor architecture rather than being separate components.
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 design enhances sensitivity by optimizing the layout of magnetoresistive elements and yokes, reducing wiring resistance, and maintaining a compact sensor size, thereby decreasing production costs.
Implementation Method 1
a plurality of magnetoresistive elements configured to detect a magnetic field induced by the plurality of yokes
Implementation Method 2
converting a magnetic field in a direction perpendicular to a surface of a substrate into a magnetic field in a direction parallel to the surface of the substrate with a plurality of yokes
Data Source
AI summary
A magnetic sensor includes a plurality of yokes, a plurality of MR elements, and a plurality of bridge circuits. The plurality of yokes include a plurality of first yokes disposed at a same position in a first direction. The plurality of bridge circuits include a first bridge circuit and a second bridge circuit that are disposed at positions different from each other in the first direction, and disposed so that the plurality of first yokes are interposed therebetween. The first bridge circuit and the second bridge circuit are connected in parallel with each other.