Electronic Device Module Boss Welding Shielding
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Solution Overview
Problem
In-vehicle camera modules face issues with electromagnetic interference due to the deterioration of spring contacts over time, leading to reduced shielding effectiveness and a complex internal configuration.
Innovation Solution
An electronic device module with a metallic casing and a ground shell having boss insertion portions, where bosses from the casing are welded to the ground shell's coated layer for electrical connection and fixation, eliminating the need for spring contacts and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring contacts are used to establish electrical connection between shield shell and ground shell, then electrical connection is achieved, but resistance values increase over time and shielding effectiveness is reduced
Solution Approach 1:
The patent removes the spring contacts from the structure entirely, replacing them with a direct welding connection between the ground shell and shield shell. This extraction of the problematic elastic contact elements eliminates the deterioration issue while maintaining electrical connectivity for shielding.
Solution Approach 2:
The patent replaces the mechanical elastic contact system (spring contacts) with a welded joint system. This substitution transitions from a mechanical connection that degrades over time to a permanent metallurgical bond that maintains consistent electrical properties throughout the product lifecycle.
2Reliability
If spring contacts are formed to establish electrical connection, then electrical connection is achieved, but internal configuration becomes complicated
Solution Approach 1:
The patent merges the ground shell and shield shell into a single integrated structure through welding, eliminating the need for separate spring contact components. This merging simplifies the internal configuration while ensuring reliable electrical connection for electromagnetic shielding.
Solution Approach 2:
The patent extracts and removes the complex spring contact mechanism from the internal configuration, replacing it with a simple welded joint between metal components. This extraction dramatically reduces structural complexity while maintaining the essential electrical connectivity function.
3Strength
If boss is inserted into boss insertion portion, then ground shell is fixed to casing, but electrical connection must be ensured
Solution Approach 1:
The patent combines the mechanical fixation function and electrical connection function into a single welding operation. The boss insertion provides mechanical positioning and strength, while the subsequent welding of the boss head to the ground shell simultaneously establishes both structural fixation and reliable electrical connectivity.
Solution Approach 2:
The patent employs a composite joining approach where mechanical insertion (physical fit) is combined with metallurgical welding (electrical and structural bond). This composite method ensures both strong fixation and consistent electrical connection by utilizing two different bonding mechanisms working together.
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
This solution provides consistent shielding effectiveness while reducing manufacturing complexity and costs, and enhances the waterproofing of the module, effectively addressing electromagnetic interference.
Implementation Method 1
the head of the at least one boss being inserted into the at least one boss insertion portion corresponding to the at least one boss, and the coated layer positioned on a periphery of the at least one boss insertion portion corresponding to the at least one boss are welded to each other
Data Source
AI summary
An electronic device module includes a metallic casing having at least one boss formed therein, an electronic device unit placed inside the casing, connector terminals for external device connection electrically connected to the electronic device unit, and a metallic ground shell disposed so as to surround the connector terminals, having a front surface covered with a metal coated layer and including at least one boss insertion portion formed, a head of the at least one boss inserted into the at least one boss insertion portion and the coated layer positioned on a periphery of the corresponding at least one boss insertion portion being welded to each other to electrically connect and fix the ground shell to the casing.