Magnetic Shielding Sheet Sealing Structure for Miniaturization
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Solution Overview
Problem
Existing magnetic field shielding sheets face challenges in miniaturization due to excessive deformation of protective films, which compromises the sealing force, especially for thicker sheet main bodies.
Innovation Solution
The introduction of a third protective layer with a hollow portion that alleviates the step difference between the sheet main body and the sealing portion, allowing for a reduced area of the first and second protective layers while maintaining an excellent sealing force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the area of protective films is expanded to form a gentle slope and prevent excessive deformation, then the sealing force is improved, but the size of the magnetic field shielding sheet becomes large
Solution Approach 1:
The protective film structure is segmented into multiple parts: a first protective film on the upper surface, a second protective film on the lower surface, and a third protective film on the side surface. This segmentation allows each protective film to be optimized independently, with the third protective film specifically addressing the step difference issue at the side surface, thereby improving sealing force without requiring excessive expansion of the overall sheet area.
Solution Approach 2:
The solution moves from a two-dimensional protective film configuration (only top and bottom surfaces) to a three-dimensional configuration by adding the third protective film on the side surface. This dimensional change allows the protective structure to accommodate the step difference created by the thick sheet main body, providing gentle slopes on all surfaces and improving sealing force without requiring excessive area expansion in the planar direction.
2Reliability
If the thickness of the sheet main body is increased to provide adequate shielding, then the shielding performance is improved, but the protective film forms a steep slope and is excessively deformed
Solution Approach 1:
The third protective film is specifically applied to the side surface of the sheet main body where the step difference and deformation issue occurs. This localized quality enhancement addresses the specific problem area without requiring changes to the entire protective film structure, allowing the thick sheet main body to maintain its shielding performance while the third protective film prevents excessive deformation at the critical side surface region.
3Area of stationary object
If the area of protective films is reduced to enable miniaturization, then the size of the magnetic field shielding sheet is reduced, but the sealing force cannot be secured
Solution Approach 1:
By segmenting the protective film into three separate components (first, second, and third protective films), each can be minimized in area independently. The third protective film on the side surface provides the necessary sealing adaptation to the step difference, allowing the top and bottom protective films to be reduced in area for miniaturization while maintaining adequate sealing force through the coordinated action of all three segments.
Solution Approach 2:
The addition of the third protective film in the vertical dimension (side surface) provides a new pathway for achieving sealing force without relying on horizontal area expansion. This dimensional change allows the magnetic field shielding sheet to be miniaturized in the planar direction while the third protective film compensates for the reduced area by providing proper sealing adaptation at the side surface.
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 solution enables the miniaturization of magnetic field shielding sheets by minimizing the area of the protective films and securing a robust sealing force, even for thicker sheet main bodies, through the strategic use of the third protective layer.
Implementation Method 1
the protective film forms a steep slope in proportion to the thickness and is excessively deformed
Data Source
AI summary
Provided are a magnetic field shielding sheet and a manufacturing method therefor. The magnetic field shielding sheet includes: a sheet main body formed from a magnetic material to be capable of shielding a magnetic field; a first protection layer disposed to cover one surface of the sheet main body; a second protection layer disposed to cover the other surface, opposite from the one surface, of the sheet main body; a third protection layer interposed between the first protection layer and the second protection layer to cover the side surface of the sheet main body in the thickness direction of the sheet main body; and a sealing part formed on the side portion of the sheet main body so that the sheet main body is sealed, wherein a stepped portion formed between the sheet main body and the sealing part is reduced by means of the third protection layer.