PCB Grounding Structure with Edge-Protrusion for Rotation Prevention
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Solution Overview
Problem
Conventional grounding structures for circuit boards face interference issues due to protruding connection members, which restrict design freedom and can lead to incomplete earth connections, especially in densely packed devices where space is limited.
Innovation Solution
A grounding structure featuring a plate-shaped connection member with protruding portions that prevent rotation during screw fastening, allowing for efficient positioning and reducing interference with adjacent components, while ensuring secure electrical connections through dual routing and stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plate-shaped connection member with protruding portions is used to prevent rotation during screw fastening, then grounding reliability is improved, but the connection member may interfere with components on the back side of the circuit board
Solution Approach 1:
The protruding portion is designed to engage with the end surface of the circuit board (peripheral surface) rather than penetrating through the board thickness. This dimensional change allows the protruding portion to provide rotation prevention functionality while occupying space in a different dimension, thus avoiding interference with components mounted on the back side of the circuit board.
2Manufacturing precision
If the protruding portion penetrates through the circuit board to ensure positioning, then positioning accuracy is improved, but interference with adjacent components occurs
Solution Approach 1:
Instead of extending the protruding portion through the circuit board thickness (one dimension), the invention engages the protruding portion with the end surface of the circuit board (peripheral surface in another dimension). This provides sufficient positioning accuracy while avoiding space occupation that would cause interference with components on the back side.
Solution Approach 2:
The protruding portion is strategically positioned to engage with the end surface of the circuit board at a location that provides adequate positioning without extending into the space where back-side components are mounted. This localized engagement provides the necessary positioning function while avoiding harmful interference.
3Ease of manufacture
If a round crimped terminal is used for earth connection, then ease of manufacture is improved, but incomplete fastening may occur due to insufficient torque
Solution Approach 1:
The connection member is designed with an asymmetric structure including a protruding portion that engages with the end surface of the circuit board. This asymmetric feature prevents rotation of the connection member during screw fastening, ensuring that the screw can be fully tightened without the connection member rotating, thereby achieving complete and reliable fastening.
Data Source
AI summary
Since a protruding portion preventing a rotation during screw fastening of a connection member is disposed to engage with an end surface of a printed circuit board, a configuration can be achieved such that the protruding portion does not interfere with an earth member, a bracket, etc. disposed on the back side of the printed circuit board, and the earth member and the bracket can freely be designed.