Magnetic Sensor Orientation for False Trigger Reduction
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Solution Overview
Problem
Magnetic interference from electronic devices with magnets can cause false triggering of magnetic sensors, leading to inappropriate operational changes in electronic devices, such as laptops, even when they are in the open configuration.
Innovation Solution
The implementation of magnetic sensor systems with strategically positioned and oriented magnetic sensors that selectively target the triggering magnetic field generated by a magnetic element, minimizing detection of spurious magnetic fields by aligning detection axes parallel to the horizontal components of the triggering magnetic field, thereby reducing false triggering events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If magnetic sensors are used to detect device configuration, then automatic operational responses can be achieved, but false triggering from ambient magnetic interference occurs
Solution Approach 1:
The magnetic sensor's detection axis is specifically oriented to be parallel to the horizontal component of the triggering magnetic field. This directional sensitivity creates a localized detection zone that accepts magnetic flux only from the intended triggering element while rejecting ambient magnetic interference from other directions, thereby maintaining high automation reliability
Solution Approach 2:
The solution introduces directional orientation as an additional dimension to magnetic field detection. By aligning the sensor's detection axis with the horizontal component of the triggering field, the system adds angular selectivity to the detection process, enabling discrimination between the intended magnetic signal and ambient interference based on their different spatial orientations
2Measurement precision
If magnetic sensors detect all magnetic fields, then comprehensive detection is achieved, but spurious magnetic fields cause incorrect operational changes
Solution Approach 1:
The magnetic sensor is configured with a specific detection axis orientation that creates a directional detection profile. This localized sensitivity accepts magnetic flux predominantly from the horizontal component direction while rejecting flux from other directions, enabling precise detection of the triggering field while filtering out spurious magnetic fields from ambient sources
Solution Approach 2:
The solution utilizes the vector nature of magnetic fields to convert the problem of ambient magnetic interference into a beneficial filtering mechanism. By orienting the detection axis to be parallel to the horizontal component of the triggering field, the system naturally rejects vertical and diagonal magnetic flux components, transforming what would be harmful interference into a useful discrimination criterion
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 approach ensures that magnetic sensors accurately detect the intended triggering magnetic field, reducing false triggers and maintaining appropriate operational states of electronic devices, even in the presence of ambient magnetic interference.
Implementation Method 1
magnetic sensor systems with strategically positioned and oriented magnetic sensors that selectively target the triggering magnetic field generated by a magnetic element
Data Source
AI summary
An electronic device can include a first and second portions that are pivotally coupled to each other so that the electronic device can have at least a closed configuration and an open configuration. A magnetic sensor system can be carried by the electronic device to detect the closed configuration so that the electronic device can automatically turn to a mode, such as a sleep mode, when the electronic device is bought to the closed configuration. A magnetic sensor can have a detection axis that targets a horizontal component of a magnetic field. A triggering magnetic element can be laterally offset relative to the magnetic sensor. The magnetic sensor can also be a magneto-resistive sensor. The electronic device can also include a second set of magnetic sensor system to confirm when the electronic device is brought to the closed configuration.