Shield Can Structure with Extended Cover for PCB EMI Shielding
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Solution Overview
Problem
Existing shield can structures for electronic devices fail to effectively shield electromagnetic waves generated by electronic components on printed circuit boards, particularly due to openings in the shield frames that allow electromagnetic interference to pass through, affecting human safety and device functionality.
Innovation Solution
A shield can structure is designed with a shield cover that covers openings in the shield frame and side walls of the printed circuit board, using a combination of shield frames and covers to surround electronic components and interrupt electromagnetic waves, while also incorporating a shielding layer or second cover to enhance shielding efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If openings are arranged at the lower end of the shield frame to prevent it from coming out during SMD process, then the shield frame positioning stability is improved, but electromagnetic waves can be introduced and discharged through the opening causing interference
Solution Approach 1:
The shield can is divided into two functional parts: the shield frame that provides mechanical positioning stability during SMD process, and the shield cover that seals the openings to block electromagnetic waves. This segmentation allows each part to fulfill its specific function without compromise.
Solution Approach 2:
The shield cover is nested over the shield frame, with the cover's side surface extending downward to cover the openings at the lower end of the shield frame. This nested structure allows the cover to seal the frame's openings while maintaining the frame's positioning function.
2Reliability
If shield frames and shield covers are matched on upper and lower surfaces of the printed circuit board, then the shield can structure is completed to cover electronic components, but it becomes difficult to interrupt electromagnetic waves generated on the side surfaces of the printed circuit board
Solution Approach 1:
The shield cover's side surface extends downward in the vertical dimension beyond the shield frame's lower end, creating an additional shielding barrier that covers the side surfaces of the printed circuit board. This dimensional extension addresses the side surface electromagnetic interference problem.
Solution Approach 2:
The shield cover is designed with different functional zones: the upper portion covers the electronic components on the printed circuit board surfaces, while the downwardly extending side surface specifically targets and shields the side surfaces of the board where electromagnetic waves are generated.
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 configuration effectively shields electromagnetic waves, improving the electromagnetic compatibility of electronic devices and reducing interference, thereby enhancing both human safety and device performance.
Implementation Method 1
a shield can or the like that may shield electromagnetic waves
Data Source
AI summary
An electronic device includes a housing comprising a first plate, a second plate, and a side member, a printed circuit board arranged inside the housing and comprises a first surface, a second surface, and at least one side surface t, a first electronic component mounted on the first surface, a second electronic component mounted on the second surface, a first shield frame formed on the first surface and has a first opening, a second shield frame formed on the second surface and has a second opening, and a first shield cover comprising a first cover part and a first side part. The first cover part is supported by the first shield frame and covers the first electronic component. The first side part extends from the first cover part to the second shield frame and is covers the printed circuit board, the first opening, and a portion of the second opening.