Shield Member Protrusions for PCB Grounding Reliability
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Solution Overview
Problem
Existing electronic equipment struggles to effectively suppress noise propagation from circuit elements on printed boards, especially when the grounding of shield members is insufficient, leading to interference with other circuit elements and wireless communication.
Innovation Solution
The electronic equipment incorporates a printed board with a ground pattern and a shield member that has a strip-shaped region opposing the ground pattern, with protruding parts and screw holes to ensure contact and secure attachment, allowing for effective noise suppression by grounding the shield member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield member is used to cover circuit elements to prevent noise propagation, then noise blocking capability is improved, but grounding reliability deteriorates when simple contact methods are used
Solution Approach 1:
The shield member is equipped with protruding parts that extend toward the ground pattern before fastening, ensuring preliminary contact and reliable grounding connection is established before the fastening operation completes. This preliminary action guarantees grounding reliability without requiring complex adjustment procedures.
Solution Approach 2:
The protruding parts act as an intermediary element between the shield member and the ground pattern, facilitating reliable electrical contact. These protrusions ensure that the grounding connection is established through a dedicated contact interface rather than relying on imperfect surface-to-surface contact.
2Reliability
If multiple screw holes are made in the shield member for secure fastening, then fastening reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The shield member is segmented with multiple screw holes distributed across its structure, allowing independent fastening points that collectively enhance overall fastening reliability. This segmentation enables the shield to be securely attached at multiple locations without requiring a single complex fastening mechanism.
3Reliability
If the shield member is designed with protruding parts for ground contact, then grounding effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The protruding parts are designed with optimized dimensions and positioning that can be directly formed during standard sheet metal fabrication processes. By carefully selecting the protrusion height, width, and location parameters, reliable grounding contact is achieved without requiring additional manufacturing steps or specialized processes, thereby controlling manufacturing costs.
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 configuration effectively prevents noise propagation by ensuring strong electrical connection between the shield member and the ground pattern, reducing interference and enhancing noise blocking capabilities while maintaining a low manufacturing cost.
Implementation Method 1
a shield member configured to be disposed opposed to the front surface of the printed board... effectively prevent propagation of noise generated by circuit elements
Implementation Method 2
The shield member has a strip-shaped region that is opposed to the ground pattern... causes the strip-shaped region and the ground pattern to get contact with each other
Data Source
AI summary
Electronic equipment includes a printed board having a front surface on which a ground pattern is formed and a shield member disposed opposed to the front surface of the printed board. The shield member has a strip-shaped region that is opposed to the ground pattern and protrudes toward the printed board, and is fastened to the printed board by screws that pass through a respective one of a plurality of screw holes made in the strip-shaped region. Either one of the shield member and the printed board has a protruding part that is formed projectingly toward the other and causes the strip-shaped region and the ground pattern to get contact with each other at a position sandwiched by adjacent two screw holes in the strip-shaped region in plan view.