Outer Conductor Terminal Locking Mechanism Resolving Noise Leakage
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Solution Overview
Problem
The existing outer conductor terminals lack a reliable lock structure and can block return currents, leading to noise issues due to the U-shaped slit design, which impedes the flow of return currents to the ground pattern on a circuit board.
Innovation Solution
An outer conductor terminal with a back plate portion and side plate portion, featuring a board connecting piece and a linear slit, respectively, to ensure the return current flows directly to the circuit board without being blocked, and a locking portion to maintain the terminal in a closed state, preventing noise leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a U-shaped slit is formed in the lid body to create a lock structure, then the locking reliability is improved, but the return current path is blocked causing noise emission
Solution Approach 1:
The lid body is divided into multiple regions: a lock formation region with a U-shaped slit for locking, and a return current flow region with a through hole for current passage. This segmentation allows the locking function and current conduction function to be separated into different spatial zones, resolving the contradiction between locking reliability and noise emission.
Solution Approach 2:
A partition wall is introduced as an intermediary structure that separates the lock formation region from the return current flow region. The partition wall allows the lock projection to engage with the locking edge while preventing the return current from leaking through the U-shaped slit, thus mediating between the locking requirement and the noise prevention requirement.
2Device complexity
If no lock structure is provided between the lid body and outer conductor terminal body, then the device complexity is reduced, but the shape retention reliability deteriorates
Solution Approach 1:
The lid body incorporates a self-locking mechanism where a lock projection on the lid body automatically engages with a locking edge on the outer conductor terminal body when the lid is positioned. This self-service locking structure maintains shape retention reliability without requiring additional external locking components, thus avoiding increased device complexity.
Data Source
AI summary
An external conductor terminal (22) comprises: a terminal body (45) that can surround the outer periphery of an internal conductor terminal (21); a back plate part (43) that is displaced from an open state to a closed state in relation to the terminal body (45), and seals a back-surface opening of the terminal body (45) in the closed state; and a side plate part (44) that connects to the back plate part (43), and constitutes a part of a side-surface portion of the terminal body (45) in the closed state. The back plate part (43) has a base plate connection piece (49) that projects out toward a circuit board (90). The side plate part (44) has: a linear-shaped slit (53) that extends toward the circuit board (90); and a locking part (54) that is bent and raised through the slit (53), is locked to the terminal body (45), and holds the back plate part (43) in the closed state.