L-Shaped Yoke Magnetic Sensor Plating Accuracy
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Solution Overview
Problem
Existing magnetic sensors face challenges in accurately forming yokes with narrow and deep holes for plating, which affects the accuracy and height of the yoke, and the arrangement of magnetic field sensing films and yokes to efficiently guide magnetic flux.
Innovation Solution
A magnetic sensor design featuring a yoke with a first portion located on the side of the magnetic field sensing film and a second portion with a larger dimension orthogonal to the first portion, allowing for accurate plating and enhanced magnetic flux guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the yoke is formed by plating in a narrow and deep hole on the side of the magnetic field sensing film, then the height of the yoke can be increased to increase magnetic flux density, but the manufacturing precision deteriorates because such plating process is disadvantageous in ensuring the accuracy with which the plating is formed
Solution Approach 1:
The yoke structure transitions from a vertical columnar shape to an L-shape by extending in the planar direction (another dimension). This dimensional change allows the yoke to achieve sufficient magnetic flux density through increased planar area rather than increased height, thereby enabling accurate plating in shallower holes while maintaining or improving magnetic performance.
2Reliability
If the end portion of the yoke is provided on the side of the magnetic field sensing film in the first direction, then magnetic flux can be guided in the first direction, but the arrangement space increases which enlarges the overall size of the magnetic sensor
Solution Approach 1:
The yoke extends in the second direction (orthogonal to the first direction) rather than only in the first direction toward the magnetic field sensing film. This dimensional change allows the yoke to provide effective magnetic flux guidance while utilizing the orthogonal direction for its extension, thereby reducing the arrangement space in the critical first direction and enabling a more compact sensor design.
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 ensures accurate formation of the yoke and effectively guides magnetic flux in the detection direction, improving the magnetic sensor's ability to detect magnetic fields while maintaining a compact size.
Implementation Method 1
a magnetic field sensing film that detects a magnetic field in a first direction
Implementation Method 2
a yoke that includes a first portion that is located on a side of the first magnetic field sensing film with respect to the first direction
Data Source
AI summary
A magnetic sensor that ensures the height of the yoke and that guides magnetic flux in the direction in which the magnetic field sensing film detects a magnetic field includes a first magnetic field detection element that has a first magnetic field sensing film that detects a magnetic field in a first direction, and a first yoke that includes a first portion that is located on a side of the first magnetic field sensing film with respect to the first direction, and a second portion that is in contact with the first portion in a direction that is orthogonal to the first direction. The average dimension of the second portion in the first direction is larger than the average dimension of the first portion in the first direction.