Cable Device EMI Shielding via Elastic Member Grounding
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Solution Overview
Problem
Current cable devices with electromagnetic shielding structures are easily visible, spoiling the aesthetic appearance of electronic devices, while cables without shielding structures lack effective electromagnetic interference (EMI) shielding at connectors.
Innovation Solution
A cable device with an invisible optical cable and a connector that includes a printed circuit board (PCB) with a ground electrode and a shield case, where an elastic member electrically connects the ground electrode to the shield case, providing improved EMI shielding without disturbing the die bonding of optical elements.
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 spoils the aesthetic appearance
Solution Approach 1:
The electromagnetic shielding function is segmented from the cable body and relocated to the connector. The cable remains invisible while the connector incorporates the shielding structure, separating the aesthetic requirement (invisible cable) from the functional requirement (EMI shielding).
Solution Approach 2:
The shielding approach transitions from wrapping the cable in a shield (affecting the cable's appearance) to creating a shielded enclosure at the connector (affecting the connector's structure). This dimensional shift moves the shielding function to a different component where it doesn't compromise cable aesthetics.
2Object-affected harmful factors
If an elastic member is added to connect the ground electrode to the shield case, then EMI shielding is improved, but the structure becomes more complex
Solution Approach 1:
An elastic member with conductive coating is used to establish the electrical connection between the ground electrode and the shield case. This flexible component provides both mechanical elasticity for contact and electrical conductivity for grounding, achieving EMI shielding without requiring complex rigid structures.
Solution Approach 2:
The elastic member combines elastic material with conductive coating, creating a composite component that simultaneously provides mechanical flexibility and electrical conductivity. This composite approach simplifies the overall structure by integrating multiple functions into a single element.
3Reliability
If the elastic member height is increased to ensure contact with the shield case, then reliability is improved, but die bonding of optical elements is disturbed
Solution Approach 1:
The elastic member's height is optimized to a specific range (0.5mm to 1.5mm) that balances two competing requirements: sufficient height to ensure reliable contact with the shield case while remaining low enough to avoid interfering with the die bonding process of optical elements. This parameter optimization resolves the contradiction between contact reliability and manufacturing precision.
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 achieves enhanced EMI shielding performance at the connector while maintaining a sleek, invisible cable appearance, ensuring both functional and aesthetic benefits.
Implementation Method 1
an elastic member arranged between the PCB and the shield case and provided to contact the ground electrode and the second face of the shield case so as to ground the shield case
Implementation Method 2
The elastic member may be compressively deformed when accommodated in the shield case
Implementation Method 3
an optic fiber provided to transmit an optical signal
Data Source
AI summary
Provided is a cable device including an optical cable capable of power transmission and a connector coupled with the optical cable, and having improved electromagnetic shielding performance. The cable device includes a cable; and a connector coupled to the cable, wherein the connector includes a printed circuit board (PCB) including a ground electrode, a shield case provided to accommodate the PCB and include a first face facing a mounting surface of the PCB and a second face perpendicular to the first face, and an elastic member arranged between the PCB and the shield case and provided to contact the ground electrode and the second face of the shield case so as to ground the shield case.