360-Degree Sealing for EMI Shielding Connectors
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Solution Overview
Problem
Conventional anti-EMI shielding devices suffer from electromagnetic wave leakage due to clearance between the connector and frame, which can be mitigated only by manual welding, leading to deformation and increased labor and time costs.
Innovation Solution
A 360-degree sealing structure is implemented using an annular rib on the frame and a corresponding annular groove on the connector, combined with external threads on the tubular portion, to ensure a secure and leak-proof connection between the frame and connector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual welding is used to seal the clearance, then electromagnetic wave leakage is prevented, but frame deformation occurs and labor time increases
Solution Approach 1:
The sealing function is segmented from the welding process and integrated into the connector structure through the annular rib and groove design. This allows the sealing to be achieved through mechanical engagement rather than thermal welding, preventing frame deformation while maintaining EMI shielding effectiveness.
Solution Approach 2:
The annular rib and groove structure acts as an intermediary mechanism between the connector and frame, providing both mechanical connection and electromagnetic sealing. This intermediary structure eliminates the need for direct welding while achieving the same sealing purpose.
2Reliability
If manual welding is used to seal the clearance, then electromagnetic wave leakage is prevented, but production time increases
Solution Approach 1:
The sealing structure is pre-formed during connector manufacturing through the annular rib and groove features. This preliminary action eliminates the need for post-assembly welding operations, thereby increasing production speed while maintaining sealing effectiveness.
Solution Approach 2:
The connector structure provides its own sealing capability through the integrated annular rib and groove design, eliminating the need for separate welding operations. This self-service approach to sealing significantly reduces assembly time and improves productivity.
3Strength
If riveting and compression is used to connect connector to frame, then firm connection is achieved, but clearance is created causing electromagnetic wave leakage
Solution Approach 1:
The connection structure incorporates local quality variations through the annular rib and groove design. The rib provides both mechanical engagement for firm connection and a tight-fitting seal to prevent electromagnetic wave leakage, achieving both strength and sealing in the same localized structure.
Solution Approach 2:
The mechanical connection function and electromagnetic sealing function are merged into a single integrated structure. The annular rib and groove simultaneously provide both the firm mechanical connection and the electromagnetic wave barrier, eliminating the clearance problem while maintaining connection strength.
Data Source
AI summary
An anti-electromagnetic interference (anti-EMI) shielding device for fastening to a PC board is disclosed. The anti-EMI shielding device includes a frame having an upper lid closed onto an open top thereof, the frame including a plurality of side walls sequentially connected to one another to enclose a space therein and having a receiving hole formed on one of the side walls at a predetermined position; a connector including an annular ring portion, a body portion, and a tubular portion following the body portion, the annular ring portion being located at a front end of the connector for engaging with the receiving hole on the side wall of the frame; and a sealing structure forming a 360-degree sealing between the frame and the connector to effectively prevent electromagnetic wave from leaking out of and entering into the shielding device.