Magnetic Sensor Guidance for Pivot Interference in Electronic Devices
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Solution Overview
Problem
Existing electronic devices with magnetic sensors face interference from metal pivots, leading to unintended power switching and increased design costs due to the need for stronger magnetic fields to compensate for magnetic sensing member proximity issues.
Innovation Solution
An electronic device design featuring a magnetic sensor positioned on a magnetism guiding member within a second body, which extends and guides the magnetic field from a magnetic member, allowing accurate detection while minimizing interference from other components and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetic sensing member is positioned close to the pivot, then the device can detect magnetic field changes more effectively, but the metal pivot causes interference and unintended power switching
Solution Approach 1:
A magnetism guiding member made of non-magnetic material is introduced as an intermediary between the magnetic member and the magnetic sensor. This mediator guides the magnetic field from the magnetic member to the sensor without being affected by the metal pivot, enabling accurate detection while isolating the sensing system from pivot interference.
2Object-affected harmful factors
If the magnetic sensing member is positioned far from the pivot, then pivot interference is reduced, but a stronger magnetic field is required which increases design cost
Solution Approach 1:
The magnetism guiding member acts as a magnetic flux conduit, efficiently directing magnetic field lines from the magnetic member to the sensor. This allows the sensor to be positioned farther from the pivot (reducing interference) while still receiving sufficient magnetic flux through the guiding member, avoiding the need for stronger magnets and reducing design costs.
3Measurement precision
If the magnetic sensor is positioned close to the magnetic member, then detection sensitivity is improved, but the metal pivot interferes with the magnetic field and causes detection errors
Solution Approach 1:
The magnetism guiding member provides a dedicated magnetic flux path that bypasses the interfering metal pivot. By positioning the sensor on or near the guiding member rather than directly adjacent to the magnetic member, the system achieves both high detection sensitivity (through the concentrated flux in the guiding member) and high reliability (by eliminating pivot interference from the direct magnetic path).
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 sensing accuracy and reduces power consumption by positioning the magnetic sensor far from the magnetic member, avoiding interference and maintaining sensitivity, thus saving design costs and power.
Implementation Method 1
The magnetism guiding member guides a magnetic field caused by the magnetic member
Implementation Method 2
The magnetic sensor detects a magnetic flux caused by the magnetic member
Data Source
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AI summary
An electronic device (1) includes a first body (10) and a second body (20). The first body (10) includes a first case (11) and a magnetic member (12) inside the first case (11). The second body (20) includes a second case (21) and includes a magnetic sensor (22), a magnetism guiding member (23) and a switch control component (24), and the magnetic sensor (22) inside the second case (21). The second case (21) is connected to the first body (10) to be movable relative to the first body (10). The magnetic sensor (22) is disposed on the magnetism guiding member (23), and the switch control component (24) is electrically connected to the magnetic sensor (22). The magnetism guiding member (23) guides the magnetic field caused by the magnetic member (12), and the magnetic sensor (22) detects the magnetic flux caused by the magnetic member (12). When the magnetic flux is larger than a first value, the switch control component (24) switches a component's switch.