Magnetic Detection Device With Substrate Stopper For Sensor Positioning
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Solution Overview
Problem
Existing magnetic detection systems face challenges in efficiently detecting rotational motion due to limitations in magnetic flux density application and sensor size, leading to reduced detection accuracy and increased manufacturing costs.
Innovation Solution
The magnetic detection system incorporates a substrate with a first through hole for inserting a magnet and a stopper to prevent the magnet from protruding, allowing for a shorter distance between the magnet and the magnetic sensor, thereby enhancing magnetic flux density application and sensor downsizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnet is positioned closer to the magnetic sensor, then magnetic flux density application is enhanced, but the magnet may protrude through the substrate causing operational issues
Solution Approach 1:
A stopper is formed on the substrate at the location corresponding to the through-hole, positioned to prevent the magnet from protruding through the substrate. This preliminary structural arrangement ensures the magnet remains at the optimal detection position without requiring additional restraining mechanisms during operation.
Solution Approach 2:
The stopper acts as an intermediary element between the magnet and the substrate, providing mechanical support and positioning control. It mediates the interaction by preventing excessive insertion while allowing the magnet to maintain close proximity to the sensor for high magnetic flux density application.
2Measurement precision
If the distance between magnet and sensor is reduced, then magnetic flux density increases, but manufacturing complexity increases
Solution Approach 1:
The stopper is integrated directly into the substrate structure, forming a unified component rather than a separate assembly. This merging of functions reduces the number of discrete parts and simplifies the manufacturing process while achieving the dual purpose of structural support and magnet positioning.
Solution Approach 2:
The substrate serves multiple functions: it provides mechanical support, creates the through-hole for magnet insertion, and incorporates the stopper for positioning control. This multi-functionality reduces overall device complexity by eliminating the need for separate components for each function.
3Area of stationary object
If sensor size is reduced for downsizing, then mounting space increases, but detection capability may be compromised
Solution Approach 1:
The magnetic flux density parameter is enhanced to 400 mT or more through optimized magnet-sensor positioning, allowing the use of smaller sensor dimensions while maintaining detection capability. The increased magnetic field strength compensates for the reduced sensor area, preserving measurement precision despite downsizing.
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 configuration enables the application of a magnetic flux density of 400 mT or more to the magnetic sensor, improving detection accuracy and allowing for sensor downsizing, which reduces manufacturing costs and expands mounting space.
Implementation Method 1
enables the application of a magnetic flux density of 400 mT or more to the magnetic sensor
Data Source
AI summary
There is provided a magnetic detection device including: a substrate including: a hole portion into which a magnet is inserted from a side of one main surface; and a stopper for stopping, from a side of another main surface, the magnet inserted into the hole portion to prevent the magnet from protruding toward the side of the another main surface; and a magnetic sensor mounted at a position corresponding to the hole portion, in the another main surface. The substrate may include a first substrate, and a second substrate bonded to the first substrate from the side of the another main surface. The hole portion may be a first through hole formed in the first substrate. The stopper may include a region, in the second substrate, that closes the first through hole.