Floated Shielding Mechanism for IO Port EMI
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Solution Overview
Problem
Existing IO shielding mechanisms on motherboards often suffer from poor electromagnetic shielding due to manufacturing tolerances, which prevent them from being properly connected to the case, leading to inadequate shielding performance.
Innovation Solution
A floated-type shielding mechanism that includes a cover, a shielding sheet with movable protrusions and openings, and a flexible conductor, allowing it to move relative to the circuit board assembly and press against the case's inner wall for effective electromagnetic shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IO shielding mechanism is directly locked to the motherboard, then the structure is simple and easy to manufacture, but the shielding mechanism cannot be well connected to the case due to tolerance, resulting in poor electromagnetic shielding
Solution Approach 1:
The shielding sheet is designed with movable protrusions that can dynamically adjust their position within openings on the back plate, allowing the shielding mechanism to adapt to tolerance variations and achieve proper connection with the case, thereby improving electromagnetic shielding without significantly increasing structural complexity
Solution Approach 2:
The flexible conductor is introduced to change the physical state of connection, allowing the shielding sheet to deform and press against the case inner wall, ensuring reliable electromagnetic shielding while maintaining a relatively simple overall structure
2Reliability
If the shielding sheet is fixed rigidly to the circuit board, then the structure is stable, but it cannot adapt to tolerance and press against the case for effective shielding
Solution Approach 1:
The shielding sheet incorporates movable protrusions that enable dynamic adjustment of position, allowing the sheet to shift and adapt to tolerance variations while maintaining stable connection with both the circuit board and case, resolving the conflict between stability and adaptability
Solution Approach 2:
The shielding sheet is designed as a flexible structure that can deform and press against the case inner wall, ensuring reliable electromagnetic shielding while maintaining positional stability through its flexible yet constrained design
3Reliability
If the shielding mechanism uses a fixed structure, then the manufacturing is simple, but it cannot deform to press against the case inner wall for effective shielding
Solution Approach 1:
The shielding sheet is designed as a flexible component that can deform to press against the case inner wall, ensuring effective electromagnetic shielding. The flexibility is achieved through movable protrusions and flexible conductors, while the overall structure remains simple and easy to manufacture
Solution Approach 2:
The flexible conductor allows the shielding sheet to change its physical state from rigid to deformable, enabling it to press against the case inner wall for effective shielding. This parameter change is achieved through simple material selection and structural design, maintaining ease of manufacture
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 mechanism ensures a good electromagnetic shielding effect by allowing the shielding sheet to deform and press against the case's inner wall, aligning the circuit board's IO ports with the case's fixing holes, thereby enhancing the assembly's shielding capabilities.
Implementation Method 1
The flexible conductor protrudes from an inner surface of the shielding sheet and is adapted to be deformed
Data Source
AI summary
A floated-type shielding mechanism including a cover, a shielding sheet, and a flexible conductor is provided. The cover is adapted to be fixed to a circuit board and covers a plurality of input/output (IO) ports of the circuit board. The shielding sheet is movably disposed at the cover and a back plate, and has a plurality of openings respectively corresponding to the IO ports. The flexible conductor deformably protrudes from an inner surface of the shielding sheet and is adapted to contact the IO ports. When the circuit board, the back plate, and the floated-type shielding mechanism are assembled into a case, the IO ports are exposed from a case opening and the flexible conductor is adapted to be deformed by pressing so that the shielding sheet presses against an inner wall surface around the case opening.