Plug Connector Metal Shell Recesses for EMI Shielding
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Solution Overview
Problem
USB connectors face issues with electromagnetic interference (EMI), dust, and debris accumulation due to their design, which affects their stability and performance, especially with frequent use.
Innovation Solution
The modification of the plug connector involves forming recesses or protrusions on the metal shell using a stamping process to enhance electromagnetic shielding and prevent dust and debris entry, ensuring stable insertion and extraction strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two holes are provided in the metal shell for snap plate engagement, then connection requirements and ground requirements are satisfied, but EMI enters through the holes and dust/debris accumulate in the holes
Solution Approach 1:
The hole is segmented into two functional zones: an upper open portion that allows snap plate engagement and connection, and a lower closed portion that prevents dust and debris accumulation. This segmentation resolves the contradiction by allowing connection functionality while preventing harmful factor accumulation.
Solution Approach 2:
Different portions of the hole have different structural qualities: the upper portion remains open to enable mechanical engagement with snap plates, while the lower portion is closed to prevent dust accumulation. This local quality differentiation allows the same structure to serve multiple functions and resolve the contradiction between connection stability and harmful factor prevention.
2Strength
If the metal shell is made with holes for snap plate engagement, then mechanical connection is achieved, but electromagnetic interference affects device capability
Solution Approach 1:
The hole is divided into an upper open portion for mechanical engagement and a lower closed portion for EMI shielding. This segmentation allows the structure to provide both mechanical connection strength and electromagnetic interference protection simultaneously.
Solution Approach 2:
The closed lower portion of the hole acts as an intermediary barrier that allows mechanical force transmission from snap plates while blocking electromagnetic interference from reaching internal components. This intermediary structure resolves the contradiction between mechanical connection and EMI protection.
3Productivity
If traditional USB connector design is used, then easy connection and high data transmission speed are achieved, but insertion and extraction strength deteriorates after frequent uses
Solution Approach 1:
The hole structure is segmented to provide both connection functionality and dust prevention, ensuring that debris does not accumulate and compromise mechanical engagement over time. This maintains insertion and extraction strength even after frequent uses while preserving high data transmission capability.
Data Source
AI summary
A plug connector is for connecting to a receptacle connector. The receptacle connector comprises two resilient plates. The plug connector has an insulating housing and a metal shell. The insulating housing includes a tongue portion and a base portion for accommodating and connecting the terminals. The metal shell has a top plate, bottom plate, and two side plates. Multiple recesses, protrusions or elongated recesses are selectively formed on at least one of the top plate, the bottom plate for connecting the resilient plates. These can avoid electromagnetic interference, dusts or any external substances from attaching to the insulating house and also ensure a high quality of the insertion force and the extraction force after frequent uses.