Resin ECU Case Shielding Layout for EMC and Inspection Access
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Solution Overview
Problem
The use of metal cases in electronic control devices increases costs and prevents in-circuit testing (ICT), Automated Optical Inspection (AOI), and X-ray inspection, while using a resin case requires measures for electromagnetic compatibility (EMC).
Innovation Solution
An electronic control device with a resin case that includes a conductive member on its surface and conductive surface-mounted members arranged to form electrical shielding, sharing the same electric potential as the substrate's signal ground, thereby reducing noise radiation and enabling conventional inspections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal case is used, then EMC resistance is improved, but costs increase
Solution Approach 1:
The patent uses a composite structure combining resin (non-conductive) and conductive members (metal or conductive material). The resin case provides cost advantage and insulation, while strategically placed conductive members provide electromagnetic shielding where needed, achieving EMC protection without using an entirely metal case.
Solution Approach 2:
Instead of using a complete metal case, the patent segments the shielding function by placing conductive members only at specific locations (inner walls facing the substrate, areas near electronic components). This segmented approach provides necessary EMC protection while reducing material costs compared to a full metal enclosure.
2Object-affected harmful factors
If a metal case is used, then EMC resistance is improved, but inspection capability deteriorates
Solution Approach 1:
The patent extracts the shielding function from the case material itself and implements it through separate conductive members attached to the resin case. This allows the case to remain transparent to inspection methods (X-ray, AOI, ICT) while the conductive members provide the necessary electromagnetic shielding, resolving the conflict between shielding and inspectability.
Solution Approach 2:
The resin case acts as an intermediary material that is transparent to inspection methods but provides a mounting structure for conductive members. The resin enables both inspection capability (by not blocking X-ray or optical signals) and EMC protection (by holding conductive shielding elements in position).
3Ease of manufacture
If a resin case is used, then costs are reduced, but EMC resistance deteriorates
Solution Approach 1:
The patent applies local quality by making the case resin (non-conductive) in most areas for cost reduction, but strategically placing conductive members in specific locations where electromagnetic shielding is needed (inner walls facing the substrate, areas near sensitive electronic components). This localized approach provides EMC protection only where necessary while maintaining cost advantages of resin.
4Object-affected harmful factors
If a resin case with conductive members is used, then EMC resistance is improved, but device complexity increases
Solution Approach 1:
The patent merges the case structure and shielding function into a single integrated assembly. The conductive members are attached to the resin case to form a unified structure that provides both mechanical protection and electromagnetic shielding, reducing the need for separate shielding components and simplifying the overall device architecture.
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 improved EMC resistance and cost reduction by using a resin case with electrical shielding, allowing for conventional inspections and eliminating the need for new inspection equipment.
Implementation Method 1
The plurality of conductive surface-mounted members are arranged to be separated from each other on the electronic component mounting surface and form electrical shielding by coming into contact with the conductive member
Data Source
AI summary
An object of the present invention is to provide an electronic control device that can be improved in EMC resistance when a resin case is used without using a metal case. An electronic control device of the present invention includes: a substrate 101; an electronic component 302 disposed on an electronic component mounting surface 101a of the substrate 101; and a resin case 100 that houses the substrate 101. The case 100 includes a conductive member 102 on a surface facing the electronic component mounting surface 101a of the substrate 101. The substrate 101 includes a plurality of conductive surface-mounted members 301 mounted on the electronic component mounting surface 101a to surround the electronic component 302. The plurality of conductive surface-mounted members 301 are arranged to be separated from each other on the electronic component mounting surface 101a and form electrical shielding by coming into contact with the conductive member 102.