Multi-Directional Magnetic Sensing for Reliable Cover Trigger Detection
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Solution Overview
Problem
Magnetic sensor apparatuses in electronic equipment, such as mobile phones and tablets, are susceptible to interference from internal and external magnetic fields, leading to inadvertent triggering of functions due to monitoring of magnetic fields in a single direction, especially when used with protective cases that complicate the magnetic field changes.
Innovation Solution
Incorporating at least two magnetic field detectors that sense magnetic fields in different directions, with a control circuit connected to the motherboard, to send a sensor signal only when external magnetic induction meets a preset threshold in each direction, thereby improving precision and avoiding inadvertent triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single magnetic field detector is used to monitor magnetic field in one direction, then the device complexity is reduced, but the measurement precision deteriorates due to susceptibility to interference from internal and external magnetic fields
Solution Approach 1:
The patent applies dimensionality change by transitioning from single-direction magnetic field detection to multi-directional detection. Specifically, it uses at least two magnetic field detectors arranged in different spatial directions (e.g., perpendicular to each other) to detect magnetic field components along different axes. This multi-dimensional approach allows the system to distinguish between magnetic fields originating from different sources (internal vs. external) by analyzing the directional characteristics, thereby improving measurement precision without excessive complexity increase.
Solution Approach 2:
The patent segments the magnetic field detection function into multiple independent detectors, each responsible for detecting magnetic field components in specific directions. By dividing the detection task across multiple sensors with different sensing orientations, the system can analyze the magnetic field from multiple perspectives and filter out interference through comparative analysis, thus improving overall measurement accuracy.
2Reliability
If a magnetic sensor apparatus monitors magnetic field in one direction, then the ease of operation is maintained, but the reliability deteriorates due to inadvertent trigger of functions
Solution Approach 1:
The patent implements feedback mechanisms where the control circuit continuously monitors the outputs from multiple magnetic field detectors and dynamically adjusts the triggering logic. By comparing the magnetic field readings from different directions and analyzing their temporal and spatial relationships, the control circuit can distinguish between legitimate triggers (such as protective case opening) and false triggers (caused by internal magnets or external interference), thereby improving reliability through intelligent feedback-based decision making.
Solution Approach 2:
The system performs preliminary analysis of magnetic field patterns from multiple detectors before triggering any function. By pre-establishing threshold values and trigger conditions based on multi-directional magnetic field characteristics, the system can predict and prevent false triggers before they occur, ensuring more reliable function activation only when genuine external magnetic field changes are detected.
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 solution enhances the precision of magnetic sensing, reducing false triggers and improving the user experience with protective cases by monitoring magnetic induction in multiple directions, ensuring accurate control of electronic equipment functions.
Implementation Method 1
Any two of the at least two magnetic field detectors sense a magnetic field respectively in two sensing directions differing from one another
Implementation Method 2
The control circuit sends a sensor signal to the motherboard in response to determining that external magnetic induction sensed by each of the at least two magnetic field detectors is no less than a preset threshold
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Electronic equipment (1) includes an equipment body (11) and a magnetic sensor apparatus (12) assembled to the equipment body (11). The magnetic sensor apparatus (12) is provided with at least two magnetic field detectors (121). Any two magnetic field detectors (121) sense a magnetic field respectively in two different sensing directions. A control circuit (122) sends a sensor signal to a motherboard (111) only when each magnetic field detector (121) senses, in a respective sensing direction per se, external magnetic induction no less than a respective preset threshold corresponding to the each magnetic field detector (121). The motherboard (111) sends a control signal to control the equipment body (11) according to the sensor signal.