Sliding EMI Shield Extension for Aperture Sealing
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Solution Overview
Problem
Standard mounting brackets with perpendicularly angled flanges in electronic equipment enclosures often require larger apertures for connector mating, leading to uncovered sections that allow electromagnetic interference (EMI)/radio frequency interference (RFI) leakage.
Innovation Solution
An elongated aperture in the enclosure with a mounting bracket and an electrically conductive shield extension, where the shield extension's flange receptacle receives the angled flange and its shielding plate covers the aperture, ensuring complete sealing with the mounting bracket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the slot-shaped aperture is made larger to accommodate the outwardly projecting flange and allow connector mating, then the ease of operation is improved, but the shielding integrity deteriorates due to uncovered sections allowing EMI/RFI leakage
Solution Approach 1:
The sealing function is divided into two segments: the mounting bracket seals the first portion of the aperture, while the shield extension seals the second portion. This segmentation allows each component to be optimized for its specific sealing zone, enabling both connector mating access and EMI/RFI protection.
Solution Approach 2:
The shield extension acts as an intermediary component between the mounting bracket and the aperture. It receives the outwardly projecting flange and extends to cover the remaining uncovered portion of the aperture, thereby mediating between the need for flange accommodation and the need for complete sealing.
2Adaptability or versatility
If the aperture is made larger to allow movement of the mounting bracket for connector mating, then the adaptability is improved, but the shielding integrity worsens due to remaining uncovered sections
Solution Approach 1:
The shield extension is designed to be movable relative to the mounting bracket, allowing the assembly to adapt during installation. The shield extension can be positioned to cover the aperture as the mounting bracket is moved into place, maintaining shielding integrity throughout the dynamic installation process.
Solution Approach 2:
The shield extension is nested with the mounting bracket, with the flange receptacle receiving the outwardly projecting flange. This nested configuration allows the smaller shield extension to be integrated with the larger mounting bracket, creating a combined sealing solution that maintains reliability while allowing adaptability.
3Ease of manufacture
If the mounting bracket is designed with a perpendicularly angled flange for standard mounting, then the ease of manufacture is improved, but the device complexity increases to accommodate the flange while maintaining sealing
Solution Approach 1:
The sealing function is segmented between the standard mounting bracket and the additional shield extension. This allows the mounting bracket to be manufactured using standard procedures while the shield extension handles the complex sealing requirement, effectively dividing the complexity into manageable parts.
Solution Approach 2:
The shield extension serves multiple functions: it seals the second portion of the aperture, receives the outwardly projecting flange, and maintains shielding integrity. By consolidating these functions into a single component, the overall device complexity is managed while preserving ease of manufacture for the standard mounting bracket.
Data Source
AI summary
Described is an adaptable electromagnetic interference and radio frequency interference (EMI/RFI) shield adapted to reduce unwanted EMI/RFI at an electrically conductive equipment panel having an elongated aperture. The aperture provides external access to a mounting bracket of an expansion board assembly. The mounting bracket (e.g., for a PCI expansion board) abuts an interior surface of the equipment panel at the elongated aperture and includes an angled flange extending through the elongated aperture. The EMI/RFI shield includes an electrically conductive shield extension slidable between open and closed positions. The shield extension includes a flange receptacle for receiving the angled flange of the mounting bracket and a shielding plate. The shielding plate overlaps an adjustable portion of the elongated aperture such that in a closed position the shielding plate together with the mounting bracket cover substantially the entire elongated aperture.