Hall Sensor Position Detection With Orthogonal Arrangement
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Solution Overview
Problem
Current position detection systems using magnetic sensors face challenges in achieving high precision over wide ranges, particularly in applications like camera zooming or auto focusing, due to limitations in miniaturization, component complexity, and sensitivity to magnetic field distribution, which restricts their use to short-range movements.
Innovation Solution
A position detection apparatus utilizing a rectangular solid magnet with a predetermined inclination angle and pairs of Hall sensors arranged orthogonally to the magnet's movement direction, allowing for precise detection over a wide range of 10 mm with a simple circuit configuration and general-purpose components, suppressing errors from non-uniform magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional Hall sensor arrangement with parallel sensors is used, then position detection can be performed, but the detection precision deteriorates over wide ranges due to non-uniform magnetic field distribution
Solution Approach 1:
The patent transitions from a one-dimensional linear sensor arrangement to a two-dimensional orthogonal arrangement. Two pairs of Hall sensors are positioned at right angles to each other, detecting magnetic field components in perpendicular directions. This dimensional change allows the system to maintain detection precision across wide ranges by capturing the magnetic field distribution in multiple dimensions, thereby compensating for non-uniformity effects.
Solution Approach 2:
The patent employs a composite detection approach by combining outputs from multiple Hall sensor pairs arranged orthogonally. The position detection system integrates signals from sensors detecting different magnetic field components, creating a composite measurement that compensates for individual sensor limitations and maintains high precision over extended detection ranges.
2Adaptability or versatility
If the distance between Hall sensors and magnet is increased to expand detection range, then detection range is improved, but measurement precision deteriorates due to weaker magnetic field signals
Solution Approach 1:
By arranging Hall sensor pairs in orthogonal directions, the system can detect magnetic field components in multiple dimensions simultaneously. This allows the sensors to be positioned at optimal distances while maintaining detection precision through multi-component field measurement, effectively decoupling the trade-off between distance and precision.
Solution Approach 2:
The patent uses multiple copies of Hall sensors arranged in different orientations. Each sensor pair detects a specific component of the magnetic field, and the combined information from these replicated sensors provides comprehensive position detection capability that maintains precision regardless of detection range.
3Volume of moving object
If miniaturization is pursued to reduce apparatus size, then device size is reduced, but position detection capability deteriorates due to limited space for sensor arrangement
Solution Approach 1:
The orthogonal arrangement of Hall sensor pairs utilizes three-dimensional space efficiently. By positioning sensors at right angles to each other, the system achieves comprehensive detection capability within a compact footprint, allowing miniaturization without sacrificing detection precision through optimized spatial utilization.
Solution Approach 2:
The patent combines multiple detection functions into a single integrated sensor arrangement. Two pairs of Hall sensors are positioned to simultaneously detect magnetic field components in orthogonal directions, merging position detection capabilities in multiple dimensions into one compact configuration that maximizes detection precision within limited space.
4Device complexity
If a simple circuit configuration is used, then device complexity is reduced, but position detection precision deteriorates due to lack of signal processing capability
Solution Approach 1:
The orthogonal Hall sensor arrangement performs self-compensation for magnetic field non-uniformity through its geometric configuration. The system inherently captures multi-component field information that automatically compensates for detection errors, achieving high precision without requiring complex external signal processing circuits or calibration mechanisms.
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 apparatus achieves high precision position detection with an error of 1% or less over a wide range, enabling miniaturization and efficient operation in applications requiring accurate position sensing, such as camera zooming and auto focusing.
Implementation Method 1
a position detection apparatus utilizing a rectangular solid magnet with a predetermined inclination angle and pairs of Hall sensors arranged orthogonally to the magnet's movement direction
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3F
AI summary
A magnetic flux detection unit and a rectangular solid magnet are provided. The magnetic flux detection unit includes one or more pairs of Hall sensors, each pair having two Hall sensors arranged on a substrate. The solid magnet is arranged movably in a direction in a plane parallel to the substrate. Each pair of two Hall sensors is arranged on the substrate so that a line connecting the centers of magnetism sensing sections of each pair of two Hall sensors is orthogonal to a movement direction of the magnet. A tetragon has a long side and a short side and the long side has a inclination angle to the line connecting the centers of magnetism sensing sections of the each pair of two Hall sensors. The magnet has one N-pole and one S-pole separately magnetized in orthogonal to the substrate on which the Hall sensors are arranged.