PCB Retention Bosses Stabilize Connector Socket Mounting
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Solution Overview
Problem
Existing printed circuit board (PCB) mounting structures fail to maintain reliable electrical connections under significant shock and vibration, leading to temporary disconnections and varying electrical resistance, causing faults or system failures.
Innovation Solution
The integration of retention bosses on the PCB, which abut the mounting socket's surfaces to stabilize the board, combined with adhesive layers for enhanced immobilization, ensures consistent electrical connections by minimizing movement and rotation during shock and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PCB is mounted in a socket using only electrical contacts and locking clips, then the mounting structure is simple, but the electrical connections become unreliable under shock and vibration
Solution Approach 1:
The mounting structure is segmented into distinct functional elements: retention bosses on the PCB, corresponding retention features in the socket, electrical contacts for electrical connection, and locking clips for mechanical retention. This segmentation allows each element to perform its specific function optimally while maintaining overall structural simplicity.
Solution Approach 2:
Retention bosses are pre-formed on the PCB during manufacturing, positioned to abut against the socket's retention features before assembly. This preliminary positioning ensures that when the PCB is inserted into the socket, the retention bosses automatically engage to prevent movement, establishing reliable electrical connections before any vibration or shock occurs.
2Strength
If locking clips exert upward force on the PCB to hold it in the socket, then the PCB is mechanically retained, but the electrical connection stability deteriorates under vibration
Solution Approach 1:
Retention bosses serve as intermediary elements between the PCB and the socket's retention features. These bosses distribute the mechanical retention force from the locking clips across a larger area and transfer it to the socket structure, preventing direct transmission of vibration forces to the electrical leads and contacts, thereby maintaining electrical connection stability.
3Device complexity
If the PCB is allowed to move with respect to the mounting socket, then the mounting structure is simple, but electrical resistance varies over time causing system faults
Solution Approach 1:
The mounting structure incorporates localized retention features (retention bosses and corresponding socket features) at specific positions on the PCB edges. These local features provide precise positioning and movement restriction only where needed for electrical connection stability, while maintaining simplicity in the overall mounting structure design.
Data Source
AI summary
A circuit board that is to be mounted in a connector socket includes a plurality of electrical connectors located along a side edge of the circuit board. Retention bosses are formed on first and second opposite sides of the circuit board, each of the retention bosses protruding from a surface of the circuit board and extending parallel to and adjacent to the first edge of the circuit board. When the first edge of the circuit board is inserted into a slot of a connector socket, contact surfaces of the first and second retention bosses contact top surfaces of the connector socket to help immobilize the circuit board with respect to the connector socket. Adhesive layers on the contact surfaces of the first and second retention bosses may adhere to the top surfaces of the connector socket to help hold the circuit board immobile with respect to the connector socket.