Chamfered Magnetic Body for Weak Field Detection
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Solution Overview
Problem
Existing magnetic sensors, particularly those using GMR elements, face challenges in detecting weak magnetic fields with sufficient intensity, leading to suboptimal detection precision.
Innovation Solution
Incorporating a soft magnetic body with chamfered corners or surfaces near the magnetoresistance effect element to efficiently direct and concentrate the magnetic field, enhancing the magnetic field intensity and detection precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional magnetic sensor uses a GMR element without a chamfered magnetic body, then the device structure is simple, but the magnetic field intensity at the GMR element is insufficient leading to poor detection precision for weak magnetic fields
Solution Approach 1:
The magnetic body is designed with chamfered corners and surfaces specifically at the location where the magnetic field interacts with the GMR element. This localized geometric modification concentrates and directs the magnetic field lines toward the GMR element, enhancing the magnetic field intensity at this specific critical location without requiring complex modifications to the entire device structure.
2Measurement precision
If the magnetic body has a conventional shape without chamfers, then the manufacturing process is simple, but the magnetic field direction cannot be efficiently directed to the GMR element
Solution Approach 1:
The magnetic body incorporates chamfered corners and surfaces that create an asymmetric geometry. This asymmetric design is specifically configured to redirect and concentrate magnetic field lines from the external magnetic field source directly onto the GMR element. The chamfered portions act as magnetic field guides, efficiently directing the field direction while remaining compatible with standard manufacturing processes.
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 chamfered magnetic body design significantly increases the magnetic field intensity at the GMR elements, thereby improving the detection precision of the magnetic sensor.
Implementation Method 1
a magnetoresistance effect element in which a resistance value changes according to a direction of an input magnetic field
Implementation Method 2
the chamfered magnetic body design significantly increases the magnetic field intensity at the GMR elements
Data Source
AI summary
The present invention relates to a magnetic sensor which can improve the detection precision of a weak magnetic field and can be downsized. A magnetic sensor is provided with a magnetic body changing the direction of a magnetic field input to a magnetoresistance effect element in the vicinity of the magnetoresistance effect element in which the resistance value changes according to the direction of the input magnetic field, the magnetic body has a mean for changing the direction of a magnetic field on the surface at a side where the magnetoresistance effect element is formed. The chamfer part of the magnetic body may be chamfered with a shape having at least one flat surface.