Board-to-Board Connector Spring Structure for Contact Return Stability
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Solution Overview
Problem
The elastic piece in existing board-to-board connectors is not sufficiently long, leading to plastic deformation and hindered return to its initial position after repeated load cycles, affecting transmission characteristics.
Innovation Solution
A board-to-board connector design with a spring piece having a first spring part and a second spring part, where the second spring part remains in contact with the board after load removal, ensuring the contact part returns closer to its original position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the elastic piece length is reduced to improve transmission characteristics, then the transmission path length is shortened and transmission characteristics are improved, but the elastic piece is prone to plastic deformation when subjected to repeated loading
Solution Approach 1:
The elastic piece is divided into two separate elastic pieces: a first elastic piece that provides the primary elastic restoring force for contact part movement, and a second elastic piece that specifically prevents plastic deformation by maintaining contact with the circuit board during loading. This segmentation allows each elastic piece to be optimized for its specific function, resolving the contradiction between transmission characteristics and durability.
2Force
If the elastic piece is deformed by a predetermined number of strokes to ensure contact pressure, then the contact pressure is maintained, but plastic strain remains in the elastic piece preventing the contact part from returning to its initial position
Solution Approach 1:
The elastic piece is divided into two separate elastic pieces: a first elastic piece that provides the primary elastic restoring force for contact part movement, and a second elastic piece that specifically prevents plastic deformation by maintaining contact with the circuit board during loading. This segmentation allows each elastic piece to be optimized for its specific function, resolving the contradiction between transmission characteristics and durability.
Solution Approach 2:
The second elastic piece acts as a preventive measure against plastic deformation before it occurs. By maintaining continuous contact with the circuit board during loading, it provides beforehand cushioning that prevents the first elastic piece from undergoing plastic deformation, ensuring the contact part can always return to its initial position.
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
The design maintains the contact part's position closer to its initial state after load removal, improving coplanarity and wiping action, and enhancing transmission characteristics.
Implementation Method 1
the spring piece of each contact includes a first spring part extending between the contact part and the fixed part, and a second spring part extending from the contact part... when the spring piece receives a load from the second board and thereby the contact part is displaced... the first spring part is deformed, and the second spring part is deformed in contact with the first board... after the load is removed and thereby the contact part is displaced in a direction of viewing the housing upper surface from the housing lower surface, the second spring part remains in contact with the first board
Data Source
AI summary
A spring piece of each contact includes a first spring part extending between a contact part and a fixed part, and a second spring part extending downward from the contact part. In a plurality of contacts, when a board-to-board connector is mounted on a main board, the second spring part is separated from the main board. In the plurality of contacts, when the spring piece receives a load from a sub-board and thereby the contact part is displaced downward, the first spring part is deformed, and further the second spring part is deformed in contact with the main board. In at least any one of the plurality of contacts, after the load is removed and thereby the contact part is displaced upward, the second spring part remains in contact with the main board.