Foldable Magnet Array Layout for EMR Stylus Interference
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Solution Overview
Problem
Foldable electronic devices experience magnetic field interference between separated housings due to magnets, affecting input devices like stylus pens using electromagnetic induction, leading to malfunctions.
Innovation Solution
Incorporate a magnet array with vertical and horizontal magnet components of varying lengths on opposing housings to minimize magnetic field deviations and inductance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If magnets are disposed at two opposite ends of the separated housings to reduce the gap, then the gap between housings is reduced, but the magnetic field generated by the magnets causes a change in magnetic field in the input device using electromagnetic induction
Solution Approach 1:
The magnet is divided into multiple segments (first magnet, second magnet, third magnet, fourth magnet) arranged in a specific pattern around the gap. This segmentation allows the magnetic fields to partially cancel each other out, reducing the net magnetic field interference in the gap region while maintaining the gap-closing force.
Solution Approach 2:
Different regions of the housing are assigned different magnetic properties. The magnets are strategically positioned at specific locations (opposite ends and intermediate positions) with specific polarities to create localized magnetic field distributions that achieve both gap reduction and interference minimization in different spatial zones.
2Reliability
If magnets are used to reduce the gap between separated housings, then the structural stability is improved, but the magnetic field generated causes inductance variations affecting input device functionality
Solution Approach 1:
The magnetic system is segmented into multiple magnets with alternating polarities arranged around the hinge gap. This segmentation creates a more controlled and distributed magnetic field pattern that maintains structural stability while reducing localized field intensity variations that would otherwise cause inductance fluctuations in the input device.
Solution Approach 2:
The magnetic field, which initially causes harmful interference, is reconfigured through strategic magnet placement and polarity assignment to serve a dual purpose: maintaining the gap-closing force for structural stability while creating field cancellation effects that reduce interference with the input device's electromagnetic induction.
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
Minimizes magnetic field strength deviations and inductance fluctuations, reducing malfunctions in input devices like stylus pens.
Implementation Method 1
magnets may be disposed at two opposite ends of the separated housings. However, the magnetic field generated by the magnets may cause a change in magnetic field in the input device
Implementation Method 2
The electronic device may detect the magnetic field generated from the input device using electro magnetic resonance (EMR) scheme
Implementation Method 3
the magnetic field generated by the magnets may cause a change in magnetic field in the input device using the electromagnetic induction scheme
Data Source
AI summary
An electronic device and method are provided. The electronic device includes a first housing, a second housing, a hinge structure connected to the first housing and the second housing, a flexible display disposed from the first housing across the hinge structure to the second housing, at least one first magnetic member disposed on the first housing, and at least one second magnetic member disposed at a position on the second housing corresponding to a position of the first magnetic member. Each of the first magnetic member and the second magnetic member includes at least one vertical magnet component perpendicular to the flexible display and at least one horizontal magnet component parallel to the flexible display. The at least one vertical magnet component is longer than the at least one horizontal magnet component.