Foldable Magnet Array Layout for Stable EMR Stylus Input
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Solution Overview
Problem
Foldable electronic devices experience magnetic field changes due to magnets used to reduce the gap between housing components, affecting input devices like stylus pens through electromagnetic induction, leading to potential malfunctions.
Innovation Solution
An electronic device design featuring a magnet array with vertically and horizontally oriented magnets, where the vertical magnets are longer than the horizontal ones, minimizing variations in magnetic field strength and inductance, thereby reducing malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
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 patent applies local quality by configuring magnets with different orientations (vertical and horizontal components) and different lengths at specific locations. The vertical magnet components are made longer than horizontal ones, creating localized variations in magnetic field strength that compensate for the overall magnetic field changes caused by housing separation, thereby reducing the harmful electromagnetic induction effects on the input device while maintaining the gap-reduction benefit
Solution Approach 2:
The patent changes the parameters of the magnet array by varying the lengths of magnet components (vertical vs. horizontal) and their orientations. This parameter modification allows control over the magnetic field distribution, reducing the magnitude of magnetic field changes that reach the input device while still achieving the mechanical function of reducing the gap between housings
2Reliability
If a magnet array with different length magnet components is used, then variations in magnetic field strength are minimized, but the device complexity increases
Solution Approach 1:
The magnet array is segmented into multiple magnet components with different orientations (vertical and horizontal) and different lengths. This segmentation allows each component to contribute differently to the overall magnetic field, enabling fine-tuned control over magnetic field variations while maintaining a manageable structural complexity through modular organization of the magnet components
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 design minimizes deviations in magnetic field strength and inductance, reducing the frequency of malfunctions in electronic pens and improving the reliability of electronic devices.
Implementation Method 1
magnets may be disposed at two opposite ends of the separated housings
Implementation Method 2
the magnetic field generated by the magnets may cause a change in magnetic field
Implementation Method 3
The electronic device may detect the magnetic field generated from the input device using electro magnetic resonance (EMR) scheme
Implementation Method 4
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.