Board-to-Board Connector Retention Key Lock Design
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Solution Overview
Problem
Conventional board-to-board connectors consume significant board area, are complex to assemble, and lack clear indication of proper connection, leading to increased costs, operator confusion, and reduced throughput.
Innovation Solution
A minimalist connector design featuring a retention key with a pliable layer and stiffening layer, where the retention key fits through slots in two boards, compresses due to applied force, and is rotated 90 degrees to secure with a locking tail, providing visual alignment confirmation of proper assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional standoffs and connector structures are used, then reliable board-to-board connection is achieved, but significant board area is consumed
Solution Approach 1:
The retention key is inserted through slots in the boards and connectors, nesting multiple components (key, slots, connectors) along the same spatial path. This allows the connection structure to be formed within the thickness of the boards rather than requiring lateral board area, effectively nesting the retention mechanism inside the board stack-up.
Solution Approach 2:
The invention transitions from a two-dimensional board surface connection to a three-dimensional through-thickness connection. By inserting the retention key through slots that penetrate the boards vertically, the connection is established in the Z-dimension (thickness direction) rather than consuming lateral board area, effectively moving the connection from the XY-plane to the Z-axis.
2Reliability
If complex connector structures are used, then connection reliability is improved, but assembly process complexity increases
Solution Approach 1:
The retention function is extracted as a separate, simple key component that can be independently inserted and manipulated. Rather than integrating complex retention mechanisms into the connectors themselves, the retention key is a distinct element that simplifies the overall assembly process by separating the retention function from the electrical connection function.
Solution Approach 2:
The retention key features a locking tail that automatically engages with the board or connector structure when inserted and rotated into position. This self-locking mechanism eliminates the need for additional fastening steps, tools, or operators to secure the connection, allowing the component to secure itself through the simple rotation action.
3Reliability
If complex connector structures are used, then connection reliability is improved, but assembly time increases and throughput decreases
Solution Approach 1:
The slots are pre-formed in the boards and connectors during manufacturing, and the retention key is designed with predetermined insertion and rotation paths. This preliminary preparation of the connection path and component geometry enables rapid assembly without requiring complex alignment procedures or multiple adjustment steps during the assembly process.
Solution Approach 2:
The retention key transitions from an inserted state to a rotated locked state, providing a dynamic assembly process that is faster than static fastening methods. The simple rotational motion locks the connection in place, enabling quick assembly and potential tool-less operation that increases throughput compared to threaded fasteners or rivets.
4Difficulty of detecting and measuring
If clear indication of proper connection is provided, then inspection needs are reduced, but connector complexity increases
Solution Approach 1:
The retention key or connector structure incorporates visual indicators (such as color-coded features, alignment marks, or visible locking positions) that change or become visible when the connection is properly formed. This allows operators to quickly verify correct assembly through visual inspection rather than requiring complex measurement tools or destructive testing.
Solution Approach 2:
The visual indication system replaces complex mechanical verification methods with simple optical detection. Rather than requiring measurement devices or complex mechanical gauges to verify connection integrity, the design uses visible features (alignment marks, color indicators, or exposed locking tails) that provide immediate visual confirmation of proper assembly.
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 connector design minimizes board area usage, simplifies assembly, and offers a clear visual indication of proper connection, enhancing manufacturing efficiency and reducing rework and inspection needs.
Implementation Method 1
A pliable layer, such as a piece of foam, may be included as part of the connector. This pliable layer may compress due to the applied force. The retention key may then be rotated such that the locking tail is at an angle of approximately 90 degrees to the slots. The retained compression force of the pliable layer may keep the retention key and prevent it from rotating back.
Data Source
AI summary
Board-to-board connectors that consume a minimal amount of board area, are simple to assemble, and provide a clear indication that a proper connection has been made. One example may consume minimal area, since only a retention key and slots in boards and connectors are needed. The connector may be simple to assemble since it may be as simple as stacking components, pushing down, and turning a retention key. Further, a first and a first line on a key and a cowling may be aligned after assembly to provide a clear indication that the connector has been properly assembled.