Multi-Axis Magnetic Sensor Event Detection for Curved Trajectories
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Solution Overview
Problem
Existing event detection systems face challenges in accurately detecting movements and positional changes of detection objects over long distances with high precision, particularly in scenarios where the detection object's movement increases, and in determining trigger threshold values for event detection in complex magnetic field configurations.
Innovation Solution
The proposed event detection system employs a magnetic-field generation unit and a multiaxial magnetic sensor that generates and detects magnetic fields across multiple axes, allowing for the determination of trigger threshold values and event detection even when the magnetic-field generation unit moves in various directions, including diagonal or curved trajectories, thereby extending the detectable region and improving precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-axis magnetic sensor is used for event detection, then the device complexity is reduced, but the measurement precision deteriorates when the magnetic-field generation unit moves in diagonal or curved trajectories
Solution Approach 1:
The patent transitions from single-axis magnetic field detection to multi-axis (biaxial or triaxial) magnetic field detection. By adding detection dimensions, the system can accurately detect magnetic field changes regardless of the movement direction (horizontal, vertical, diagonal, or curved trajectories) of the magnetic-field generation unit, thereby resolving the precision limitation of single-axis sensors.
Solution Approach 2:
The magnetic sensor is designed to detect magnetic fields in multiple directions simultaneously, making it universally applicable to various movement patterns of the magnetic-field generation unit. This multi-functional capability allows a single sensor configuration to handle diverse event detection scenarios without requiring additional specialized sensors.
2Area of stationary object
If the detection distance is increased to cover larger areas, then the area of detection is improved, but the measurement precision deteriorates
Solution Approach 1:
The patent segments the detection space by using multiple magnetic sensors positioned at different locations. Each sensor covers a specific spatial region, and by combining data from multiple segmented detection zones, the system achieves both wide coverage area and high precision within each segment. This segmentation approach allows the system to maintain accurate event detection across large areas.
3Device complexity
If traditional event detection methods are used with limited detection axes, then the device complexity is reduced, but the reliability deteriorates in complex magnetic field configurations
Solution Approach 1:
The patent introduces a processing unit that acts as an intermediary between the multi-axis magnetic sensor and the event detection logic. This processing unit calculates trigger threshold values based on magnetic field changes in multiple directions and determines events by comparing actual measurements against these dynamically calculated thresholds, thereby improving reliability in complex magnetic field configurations while managing system complexity through sophisticated software processing.
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 system effectively generates trigger signals based on relative positional changes, enabling accurate event detection and state transitions in devices like rollable phones and smartwatches, even in situations where traditional methods fail to detect events due to undetectable regions, thereby enhancing the reliability and flexibility of event detection systems.
Implementation Method 1
a magnetic sensor that detects the magnetic field generated by the magnetic-field generation unit
Data Source
AI summary
Provided is an event detection method comprising: obtaining an event occurrence position based on a magnetic field detected by a magnetic sensor; selecting a detection axis for event detection based on the event occurrence position; calculating a trigger threshold value according to the event occurrence position on the detection axis; and obtaining a trigger signal indicating that the magnetic field detected by the magnetic sensor and the trigger threshold value meet a predefined condition.