Grounded Shield Case for PCB Connector EMI Control
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Solution Overview
Problem
Cables without electromagnetic shielding structures are difficult to integrate with connectors for effective electromagnetic interference (EMI) shielding, as they lack visible EMI shielding structures that degrade the appearance of electronic devices.
Innovation Solution
A cable device with an invisible optical cable and a connector that includes a shield case in contact with a printed circuit board's ground electrode, utilizing a conductive shield case with a contact portion and support portion to enhance EMI shielding without a separate structure on the printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an electromagnetic shielding structure is added to the cable, then EMI shielding performance is improved, but the cable becomes visible and degrades the appearance of electronic devices
Solution Approach 1:
The shielding function is segmented from the cable to the connector. The cable itself remains invisible without shielding structure, while the connector incorporates the shielding structure (shield case) that is grounded to provide EMI protection at the connection point where visibility is less critical to appearance.
2Object-affected harmful factors
If an electromagnetic shielding structure is added to the connector, then EMI shielding performance is improved, but the device complexity increases due to additional structures
Solution Approach 1:
The shield case is merged with the connector housing to form an integrated structure. The shield case is directly grounded to the ground electrode on the printed circuit board through a contact portion, eliminating the need for separate grounding structures or additional mounting components.
Solution Approach 2:
The shield case serves multiple functions: it provides EMI shielding, acts as a structural component of the connector, and provides a grounding path through its contact portion with the ground electrode. This multi-functionality reduces the need for additional separate components.
3Object-affected harmful factors
If a separate grounding structure is mounted on the printed circuit board, then EMI shielding effectiveness is improved, but the manufacturing complexity and assembly steps increase
Solution Approach 1:
The shield case is designed with an integrated contact portion that automatically contacts the ground electrode on the printed circuit board during assembly. This self-grounding feature eliminates the need for separate grounding wires, clips, or mounting operations, reducing assembly complexity while ensuring effective EMI shielding.
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 solution provides improved EMI shielding performance for the connector connected to the invisible cable, maintaining the aesthetic appeal of electronic devices by eliminating visible shielding structures while ensuring effective electromagnetic interference protection.
Implementation Method 1
A cable may include a conductor such as a copper wire for high voltage power transmission. The cable may have an electromagnetic shielding structure surrounding the conductor to shield electromagnetic waves generated from the conductor.
Data Source
AI summary
Disclosed herein is a cable device including a cable configured to transmit power and a connector connected to the cable, the cable device including a connector with improved electromagnetic interference (EMI) shielding performance. The cable device includes a cable, and a connector connected to the cable. The connector includes a printed circuit board including a ground electrode, and a shield case provided to accommodate the printed circuit board therein, the shield case including a contact portion provided in direct contact with the ground electrode.