Tilted Rod Magnet Displacement Detection Device
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Solution Overview
Problem
Conventional displacement detection devices cannot uniquely determine the rotation angle of a rotation body due to ambiguous output changes, making it difficult to accurately detect minute changes in rotation angles.
Innovation Solution
A displacement detection device featuring a rod-shaped magnet tilted at a predetermined angle, allowing the sensor to detect magnetic flux densities in orthogonal directions, enabling unique determination of displacement and expanding the detectable displacement range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional displacement detection devices use periodic voltage output to detect rotation angle, then detection sensitivity for minute changes is improved, but the ability to uniquely determine rotation angle deteriorates
Solution Approach 1:
The invention transitions from single-dimension periodic voltage output to two-dimensional output by introducing a second detection element. The first detection element provides periodic voltage changes for sensitivity, while the second detection element provides complementary information to resolve ambiguity. This dimensional expansion allows both high detection sensitivity and unique angle determination to coexist.
Solution Approach 2:
The detection function is segmented into two separate detection elements with different orientations. The first detection element detects magnetic field changes in one orientation for periodic voltage output, while the second detection element detects magnetic field changes in a different orientation. This segmentation allows each element to contribute different aspects of the magnetic field information, enabling both sensitive detection and unambiguous angle determination.
2Adaptability or versatility
If a magnet is arranged to rotate with the rotation body, then rotation detection is enabled, but the detection range is limited to one period
Solution Approach 1:
By adding the second detection element with a different orientation, the system expands from single-period detection to multi-period or continuous detection capability. The combined output from two detection elements with different orientations provides information that extends the detectable rotation range beyond a single period, effectively increasing the detection range while maintaining rotation detection capability.
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 device can uniquely determine the displacement of the detection target and widen the detectable displacement range by processing outputs from Hall elements, providing accurate and expanded detection capabilities.
Implementation Method 1
a magnet which is displaced in one direction, is rod-shaped and has a form in which a longitudinal direction and the one direction form a predetermined angle; and a sensor which detects a magnetic flux density of a magnetic field formed by the magnet
Implementation Method 2
a sensor which detects a magnetic flux density of a magnetic field formed by the magnet in a direction orthogonal to at least the one direction and a magnetization direction of the magnet and outputs a signal proportional to the magnetic field detected
Data Source
AI summary
Provided is a displacement detection device which can uniquely determine displacement of a detection target from output values based on detection as well as make a displacement range of the detection target wider than a displacement range detectable by a sensor.A displacement detection device includes a magnet which is displaced in a displacement direction Ds, is rod-shaped and has a form in which a longitudinal direction and the displacement direction Ds form a predetermined angle θ, and a sensor IC which detects a magnetic flux density of a magnetic field formed by the magnet in an x direction and a z direction orthogonal to the displacement direction Ds and outputs a signal proportional to the magnetic field detected.