Foldable Device Coil Layout for Stylus Charging and Antenna Isolation
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Solution Overview
Problem
Attaching and powering an input device to a portable electronic device that can be switched between unfolded and folded states is challenging, especially in the folded state where the coil and receiving coil may not align, leading to instability and difficulty in supplying power.
Innovation Solution
The electronic device incorporates a magnetic material and a coil arrangement that allows attachment and charging of an input device regardless of the device's unfolded or folded state, with a non-conductive region on the housing and coil placement to prevent interference with the antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electronic device is folded to reduce size, then portability is improved, but the coil and receiving coil cannot align properly causing power transmission failure
Solution Approach 1:
The coil is divided into multiple segments (first coil segment and second coil segment) arranged at different positions along the folding axis. This segmentation allows different parts of the coil to maintain alignment with the receiving coil in both folded and unfolded states, resolving the power transmission failure issue while preserving portability.
Solution Approach 2:
The coil segments are arranged not only in the plane parallel to the display but also extended along the folding axis dimension. This multi-dimensional arrangement ensures that at least one coil segment maintains proper alignment with the receiving coil regardless of the folding state, enabling reliable power transmission in both compact and expanded configurations.
2Reliability
If the coil is placed to transmit power in folded state, then power transmission is improved, but the coil interferes with the antenna causing harmful effects
Solution Approach 1:
A non-conductive region is created between the coil segments and the antenna, providing local electrical isolation. This allows the coil to be positioned for effective power transmission while the non-conductive material prevents electromagnetic interference with the antenna, resolving both power transmission reliability and antenna functionality simultaneously.
Solution Approach 2:
A non-conductive member is introduced as an intermediary element between the coil and the antenna. This mediator provides electrical isolation and prevents harmful electromagnetic coupling, allowing the coil to function effectively for power transmission without degrading antenna performance.
3Force
If the magnetic material is placed to attach input device, then attachment strength is improved, but the coil and receiving coil misalignment in folded state causes power supply failure
Solution Approach 1:
The magnetic material is positioned to work with the segmented coil structure, ensuring that the input device attachment location corresponds with at least one active coil segment in both folded and unfolded states. This maintains both strong magnetic attachment and reliable power transmission across different device configurations.
Solution Approach 2:
The coil structure is designed to serve multiple functions: power transmission when the device is unfolded, and both attachment and power transmission when folded. The segmented coil arrangement ensures that the same physical structure can effectively transmit power regardless of device state, making the system universally functional across different configurations.
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
Enables stable attachment and charging of the input device across different device configurations, prevents device damage, and adjusts antenna performance to maintain functionality.
Implementation Method 1
The electronic device may include a magnetic material for attaching the input device to the electronic device
Implementation Method 2
The electronic device can transmit power to the input device attached to the electronic device using a coil
Data Source
AI summary
An electronic device is provided. The electronic device includes a first housing, a second housing rotatably connected to the first housing around a folding axis, a first display arranged on one surface of the first housing and one surface of the second housing, a second display arranged on another surface of the first housing, a magnetic material attaching an input device to the electronic device, and a coil that transmits power to the input device, wherein the first housing includes a non-conductive region on at least a portion of a side surface of the first housing formed perpendicular to one surface of the first housing and the other surface of the first housing and parallel to the folding axis, wherein the magnetic material and the coil are arranged in a space surrounded by the side surface of the first housing, a first region of the first display, and a second region of the second display arranged in the opposite side of the first region, and wherein the coil is arranged at a position overlapping the non-conductive region.