Covered Magnetic Shielding Sheet for Oxidation-Resistant Wireless Charging
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Solution Overview
Problem
Magnetic shielding sheets used in wireless charging systems face issues with particle separation and oxidation when their exposed surfaces come into contact with moisture, leading to potential short circuits and reliability concerns.
Innovation Solution
A magnetic shielding sheet with a cover member that covers all surfaces of the magnetic sheet, made of materials like amorphous or nano-crystalline alloys, is used to prevent exposure and oxidation, and is designed as a multilayer sheet with fine pieces having curved sides for enhanced flexibility and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the magnetic shielding sheet is manufactured through a punching process, then the magnetic sheet can be formed into required shapes, but the punched surface becomes externally exposed leading to particle separation and oxidation
Solution Approach 1:
A cover member in the form of a thin film is applied to cover the punched surface of the magnetic shielding sheet. This thin film encapsulates the exposed metal particles and prevents their separation, while also providing a barrier against oxidation from environmental moisture and air.
Solution Approach 2:
The cover member acts as an intermediary layer between the magnetic shielding sheet and the external environment. It mediates the interaction by physically separating the punched surface from direct contact with air and moisture, thereby preventing oxidation and particle detachment.
2Ease of operation
If the punched surface is externally exposed, then the magnetic shielding sheet can be assembled, but particles separate and cause short circuits in electronic circuits
Solution Approach 1:
The cover member functions as a protective thin film that encapsulates the punched surface, preventing metal particles from separating and contaminating surrounding electronic circuits during assembly and operation.
Solution Approach 2:
The cover member is applied in advance to prevent particle separation before it can cause harmful effects. By pre-encapsulating the punched surface, the system proactively prevents the detachment and migration of conductive metal particles that could cause short circuits.
3Reliability
If the punched surface contacts moisture during salt spray test, then the test can be performed, but oxidation occurs degrading performance
Solution Approach 1:
The cover member creates a protected environment around the punched surface, effectively isolating it from the corrosive salt spray atmosphere. This barrier prevents moisture and salt from contacting the metal surface, thereby preventing oxidation and maintaining compositional stability during reliability testing.
Solution Approach 2:
The thin film cover member provides a physical barrier that protects the punched surface from environmental degradation during salt spray testing, maintaining the surface's original composition and preventing oxidation-induced performance degradation.
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
The solution effectively prevents particle separation and oxidation, enhancing the reliability of wireless charging systems by maintaining the magnetic sheet's initial characteristics and performance.
Implementation Method 1
a magnetic shielding sheet attached to one surface of the antenna unit through an adhesive layer so as to shield a magnetic field generated in the antenna unit
Data Source
AI summary
A magnetic shielding sheet is provided. The magnetic shielding sheet according to an embodiment of the present invention comprises: a plate-shaped magnetic sheet made of a magnetic material containing a metal component; and a cover member for covering the entire surface of the magnetic sheet so as to prevent the surface of the magnetic sheet from being exposed to the outside.