Connector Shield Structure for SMT Grounding and EMC Protection
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Solution Overview
Problem
Existing technologies face challenges in electrically connecting shield members for electromagnetic compatibility (EMC) measures to printed circuit boards during surface mount technology (SMT) board mounting, which is desired for reducing soldering weight, costs, and process steps.
Innovation Solution
A shield structure that includes a connector shield metal part directly connected to a housing and electrically connected to a connector via an elastic member, eliminating the need for soldering and allowing GND connection through SMT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shield members are soldered to printed circuit boards by DIP process, then reliable GND connection is achieved, but board mounting complexity and costs increase
Solution Approach 1:
The patent introduces a connector shield metal part as an intermediary component that provides GND connection functionality. This shield member acts as a mediator between the connector and the housing, eliminating the need for complex DIP soldering processes while ensuring reliable electrical connection to ground potential through direct contact with the grounded housing.
Solution Approach 2:
The patent extracts the GND connection function from the traditional DIP soldering process and relocates it to the connector shield metal part that directly contacts the housing. This separation allows the printed circuit board to be mounted using simpler SMT processes while the shield member independently provides the required ground connection through mechanical contact with the housing.
2Reliability
If DIP soldering process is used for shield members, then stable GND connection is achieved, but facility costs and jig costs increase
Solution Approach 1:
The connector shield metal part serves as an intermediary that provides GND connection without requiring expensive DIP soldering facilities. By designing the shield member to directly contact the grounded housing, the patent eliminates the need for specialized DIP soldering equipment and jigs, thereby reducing manufacturing costs while maintaining connection stability.
Solution Approach 2:
The shield member is designed to automatically establish GND connection through its own structure that directly contacts the housing. This self-service mechanism eliminates the need for additional soldering processes, facilities, and jigs, reducing manufacturing costs while ensuring reliable ground connection is achieved through the shield member's inherent design.
3Reliability
If multiple mounting processes are used, then comprehensive EMC measures are achieved, but number of process steps increases
Solution Approach 1:
The patent merges multiple functions into the connector shield metal part: it provides electromagnetic shielding, establishes GND connection, and serves as a structural component. By combining these functions into a single integrated component that directly contacts the housing, the patent reduces the number of separate mounting processes needed while maintaining comprehensive EMC protection.
Solution Approach 2:
The connector shield metal part is designed as a multi-functional component that simultaneously provides electromagnetic shielding, ground connection, and mechanical support. This universal component performs multiple roles that would traditionally require separate elements and processes, thereby reducing the overall number of process steps while achieving comprehensive EMC measures.
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
Enables effective EMC measures by simplifying the board mounting process, reducing costs, and ensuring reliable GND connection without the need for DIP soldering, while enhancing vibration and impact resistance.
Implementation Method 1
an elastic member 53 which is surface-mounted on the printed circuit board 45
Data Source
AI summary
A shield structure according to the present disclosure includes a printed circuit board, an elastic member, and a connector shield metal part. The printed circuit board is placed inside a grounded housing. At least one electronic component including a connector connected outside is surface-mounted on the printed circuit board. The elastic member is placed on a mounting surface side of the printed circuit board, inside the housing. The connector shield metal part is placed on the mounting surface side, inside the housing and formed in a shape covering the connector. The connector shield metal part directly contacts and is electrically connected to the housing, and is electrically connected to the connector via the elastic member in a state where the connector shield metal part is attached to the housing.