Magnetism Detection Device Using Nested Magnetic Field Direction Changing Body
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Solution Overview
Problem
Magnetism detection devices using magneto-impedance elements and magnetic direction changing bodies face challenges in accuracy and size reduction, particularly in mobile applications where positional alignment is critical and miniaturization is needed.
Innovation Solution
A magnetism detection device with a substrate of semiconductor material featuring through-holes with increasing cross-sectional dimensions, accommodating magnetic field direction changing bodies, and a configuration that allows for accurate magnetism detection along the thickness direction and perpendicular directions using smaller magneto-impedance elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magneto-impedance element and magnetic direction changing body are arranged close to each other to improve detection accuracy, then detection accuracy is improved, but device size cannot be reduced
Solution Approach 1:
The magnetic direction changing body is nested inside the through-hole of the substrate, while the magneto-impedance element is mounted on the substrate surface. This nested arrangement allows the two components to be positioned close to each other for accurate magnetic field interaction while containing them within a compact volume defined by the substrate thickness, thereby resolving the contradiction between detection accuracy and device size reduction
Solution Approach 2:
The invention utilizes the thickness direction (z-axis) of the substrate as an additional spatial dimension to position the magnetic direction changing body below the magneto-impedance element. This vertical stacking in the thickness direction enables close proximity for accurate detection while reducing the planar footprint, thus achieving both high detection accuracy and compact device size
2Volume of moving object
If magneto-impedance element size is reduced for miniaturization, then device size is reduced, but detection accuracy deteriorates
Solution Approach 1:
The magnetic direction changing body acts as an intermediary that concentrates and directs the external magnetic field toward the magneto-impedance element. This intermediary structure enhances the magnetic flux density at the sensing element, allowing smaller magneto-impedance elements to maintain sufficient detection sensitivity even with reduced size, thus resolving the contradiction between miniaturization and detection accuracy
Solution Approach 2:
The invention changes the magnetic field parameters (flux density and direction) through the magnetic direction changing body to optimize the interaction with the magneto-impedance element. By controlling the magnetic field concentration and orientation, smaller sensing elements can achieve adequate detection performance, enabling device miniaturization without sacrificing detection accuracy
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
Enhances detection accuracy and reduces device size by optimizing the magnetic flux density and direction, enabling more precise magnetism detection in multiple directions with improved positional alignment and miniaturization of components.
Implementation Method 1
The magneto-impedance element uses a magneto-impedance effect in which impedance changes due to the skin effect when a high-frequency pulse current flows in the wire
Implementation Method 2
The magneto-impedance element uses a magneto-impedance effect in which impedance changes due to the skin effect when a high-frequency pulse current flows in the wire
Implementation Method 3
The magnetic field direction changing body performs a function of causing a response in the wire by changing the direction of an external magnetic field, such as that of the Earth, in a direction different from that of the wire
Data Source
AI summary
Provided is a magnetism detection device by which it is possible to achieve a reduction in size and an increase in accuracy. A magnetism detection device includes: a magneto-impedance element; a magnetic field direction changing body; and a substrate that is formed of a semiconductor material and has an element arrangement recessed portion bottom surface and a back surface that face mutually opposite sides in a thickness direction, and a through-hole that reaches the element arrangement recessed portion bottom surface and the back surface and has a cross-sectional dimension that increases toward the main surface starting from the element arrangement recessed portion bottom surface. The magneto-impedance element is mounted on the element arrangement recessed portion bottom surface, and the magnetic field direction changing body is accommodated in the through-hole.