Angle Sensing Device with Auxiliary Magnetic Signal
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Solution Overview
Problem
Existing angle sensing devices for foldable electronic products face challenges such as increased production costs due to material selection requirements to avoid residual magnetic effects, calibration needs due to manufacturing tolerances, and interference from external magnetic fields, limiting usage scenarios.
Innovation Solution
An angle sensing device with a rotating mechanism, a first magnetic element, a first magnetic sensor, a second magnetic sensor, and a controller that calculates the included angle between cover bodies using the magnetic field sensed by the first sensor and an auxiliary signal from the second sensor to determine the open or closed state, reducing reliance on precise material selection and external field interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strict material selection is used to avoid residual magnetic effects, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
A magnetic shielding layer is introduced as an intermediary component between the magnetic sensor and the external environment. This shielding layer blocks external magnetic field interference and reduces the impact of residual magnetic effects from surrounding materials, allowing the use of ordinary materials instead of expensive specialized materials while maintaining sensing accuracy
Solution Approach 2:
The system performs self-calibration by detecting the magnetic field characteristics when the cover is in known positions (fully open, fully closed, intermediate positions) and automatically storing these reference values. This eliminates the need for manual factory calibration and compensates for manufacturing tolerances, reducing both cost and complexity
2Measurement precision
If factory calibration is performed to compensate for manufacturing tolerances, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The angle sensing device performs automatic self-calibration during initial setup or when reference positions are detected. The system autonomously measures magnetic field values at known angular positions (0°, 45°, 90°, etc.) and stores them as reference data, eliminating the need for manual factory calibration and enabling mass production without sacrificing accuracy
Solution Approach 2:
The system pre-stores reference magnetic field values corresponding to standard angular positions in its memory. These preliminary reference values are used for subsequent angle calculations, allowing rapid compensation for manufacturing variations without requiring time-consuming calibration procedures during production
3Reliability
If the system is designed to be immune to external magnetic field interference, then reliability is improved, but device complexity increases
Solution Approach 1:
A magnetic shielding layer is introduced as an intermediary component between the magnetic sensor and the external environment. This shielding layer blocks external magnetic field interference and reduces the impact of residual magnetic effects from surrounding materials, allowing the use of ordinary materials instead of expensive specialized materials while maintaining sensing accuracy
Solution Approach 2:
The system continuously monitors magnetic field values and compares them against reference ranges stored in memory. When the magnetic field value falls within the expected range for the current angular position, the detection is validated; when it falls outside the range (indicating external interference), the system can flag the reading as invalid or trigger recalibration, ensuring reliable operation
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
Enhances the accuracy of determining the open or closed state between cover bodies by providing an auxiliary signal to counteract external magnetic field interference and residual magnetic effects, eliminating the need for factory calibration and expanding usage scenarios.
Implementation Method 1
The first magnetic sensor is disposed in the first cover body to sense a magnetic field generated by the first magnetic element
Implementation Method 2
The second magnetic sensor is disposed on an end of the first cover body away from the rotating mechanism corresponding to a position of the second magnetic element, and is configured to generate an auxiliary signal when the second magnetic element approaches
Data Source
AI summary
An angle sensing device including a first cover body, a second cover body, a rotating mechanism, a first magnetic element, a second magnetic element, a first magnetic sensor, a second magnetic sensor, and a controller is provided. The first magnetic sensor is configured to sense a magnetic field generated by the first magnetic element. The second magnetic sensor is disposed on an end of the first cover body away from the rotating mechanism corresponding to a position of the second magnetic element, and is configured to generate an auxiliary signal when the second magnetic element approaches. The controller receives the magnetic field sensed by the first magnetic sensor to calculate an included angle between the second cover body and the first cover body. The controller judges whether the second cover body and the first cover body are in a closed state or an open state according to the auxiliary signal and the calculated included angle.