Shielding Cover Soldering Layout to Prevent Adhesive Wicking
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Solution Overview
Problem
Existing electromagnetic shielding solutions for electronic circuits with optical signal emission and reception regions face issues with adhesive calibration, potential interference from adhesive wicking, and inconsistent durability of the casing attachment.
Innovation Solution
An electromagnetic shielding cover with a metal hood featuring soldering areas delimited by openings, assembled using brazing joints, ensuring secure attachment to a substrate with improved mechanical strength and effective shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive material is used to secure the metal cover to the substrate, then the electromagnetic shielding cover can be assembled, but the adhesive may wick into the casing by capillary action and interfere with electronic component functioning
Solution Approach 1:
The harmful adhesive material is extracted from the assembly process. Instead of using adhesive to secure the metal cover, the patent employs mechanical attachment methods where the metal cover is directly mounted to the substrate through precision fitting and structural integration, eliminating the risk of adhesive wicking into the casing
Solution Approach 2:
A mechanical intermediary structure is introduced between the metal cover and substrate. The design includes integrated mounting features such as recesses, protrusions, or friction-fit mechanisms that serve as intermediaries to secure the cover without requiring adhesive materials
2Ease of manufacture
If adhesive material is used to secure the metal cover to the substrate, then the electromagnetic shielding cover can be assembled, but the durability of the casing attachment is inconsistent
Solution Approach 1:
The chemical bonding mechanism of adhesive is replaced with a mechanical bonding system. The metal cover incorporates integrated mounting structures such as snap-fit mechanisms, friction locks, or precision-machined interfaces that provide consistent and durable mechanical attachment to the substrate
Solution Approach 2:
The attachment mechanism transitions from chemical bonding (adhesive) to mechanical bonding with controlled parameters. The design specifies precise dimensional tolerances, surface finishes, and geometric features that ensure consistent mechanical engagement and durable attachment
3Object-affected harmful factors
If a metal cover is placed over the lid for electromagnetic shielding, then electromagnetic wave protection is provided, but difficulties in calibrating the adhesive arise
Solution Approach 1:
The adhesive calibration step is extracted from the assembly process. The metal cover design eliminates the need for adhesive application and calibration by incorporating self-aligning mechanical features such as tapered interfaces, locating pins, or snap-fit structures that automatically position the cover correctly during assembly
Solution Approach 2:
The assembly process becomes self-aligning and self-securing. The metal cover includes integrated mechanical features that automatically guide placement and secure attachment without requiring external calibration operations, reducing assembly complexity and improving consistency
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 a robust and efficient electromagnetic shielding with improved mechanical strength and durability, while maintaining transparency for optical signals, suitable for applications in mobile telephony, automotive, IoT, smart homes, 5G networks, and personal electronics.
Implementation Method 1
each solder joint being soldered both to one of the metallic pads of the substrate and to one of the solder areas of the hood
Implementation Method 2
the adhesive material will wick into the casing by capillary action
Data Source
Figure 1~2
Figure 3~4B
AI summary
The present description relates to an electromagnetic shielding cover (100) for an electronic circuit comprising a main face (101) and four side faces (102, 103, 104, 105), one of the side faces (102) having, at its base, soldering areas (110), each soldering area (110) being delimited by several openings (120). It also relates to an electronic circuit, in particular an optical transmission and/or reception circuit, comprising a chip (350) fixed to a first main face (301) of a substrate (300) and such a cover (100), the first main face (301) of the substrate being locally covered by metal pads (310), the cover (100) and the substrate (300) being assembled to each other by means of solder joints (400), each solder joint (400) being soldered to one of the metal pads (310) and to one of the solder areas (110).