Angled EMC Shield Structure for PCB-Housing Contact
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Solution Overview
Problem
Existing EMC shields do not adequately meet regulatory specifications and are not well suited for interfacing with printed circuit boards (PCBs) and housings, failing to provide effective electromagnetic compatibility (EMC) and often compromising heat transfer and vibration management.
Innovation Solution
An EMC shield design featuring angled portions with a bend portion connecting them, allowing for improved contact and spring properties, which is manufactured from stamped and bent sheet metal, and optionally using compressible pads for attachment to the housing, enhancing EMC shielding, thermal conductivity, and vibration absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a straight EMC shield is used, then the manufacturing is simpler, but it cannot compensate manufacturing tolerances and does not provide advantageous contact between the shield and housing
Solution Approach 1:
The shield incorporates a bend portion with a curved transition between the first and second portions. This curvature allows the shield to adapt to manufacturing tolerances and achieve planar contact with the housing, resolving the contradiction between contact quality and structural simplicity.
Solution Approach 2:
The bend portion provides spring properties to the shield, enabling it to dynamically adjust to manufacturing variations and maintain optimal contact with the housing. This dynamic capability improves contact quality without requiring complex adjustment mechanisms.
2Area of stationary object
If the first and second portions are arranged in a single plane, then the structure is simpler, but it cannot provide advantageous contact area with the housing
Solution Approach 1:
The shield transitions from a single-plane arrangement to a three-dimensional configuration with the bend portion. This dimensional change enables the second portion to be attached to the housing at an angle different from perpendicular, increasing the contact area while maintaining structural integrity.
3Area of stationary object
If the second portion is attached perpendicularly to the housing, then the attachment is straightforward, but it reduces the contact area and spring properties
Solution Approach 1:
The bend portion is designed to provide spring properties that enable the second portion to attach to the housing at an angled orientation. This dynamic attachment mechanism increases contact area while remaining manufacturable through standard bending and attachment processes.
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 design compensates for manufacturing tolerances, ensures effective EMC shielding, facilitates heat transfer, and absorbs vibrations, while providing a stable interface between the PCB and housing.
Implementation Method 1
the use of the bend portion may advantageously enable spring properties of the EMC shield (e.g., the second portion, and preferably the third portion) which may be advantageous for assembling/closing the housing
Implementation Method 2
Shielding aims at improving EMC properties for electrical components. It may be generally used with any electrical component having high exposure to and/or high emissions of electromagnetic radiation
Implementation Method 3
enhancing EMC shielding, thermal conductivity, and vibration absorption
Implementation Method 4
enhancing EMC shielding, thermal conductivity, and vibration absorption
Data Source
AI summary
An electromagnetic compatibility (EMC) shield for providing electromagnetic compatibility of electronic components. The EMC shield includes a first portion, a second portion, and a third portion. The first portion being arranged for attachment to a printed circuit board. The second portion being arranged for attachment to a housing at least partially enclosing the printed circuit board. The first and second portions are arranged at an angle to each other. The third portion connects the first and second portions. The third portion is a bend portion between the first portion and the second portion.