Blind Mate Connectors with Nested Float and Guide Mechanisms
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Solution Overview
Problem
Blind mate connectors in server chassis face challenges in aligning and connecting PCBs with different orientations, particularly when trays are inserted at 90-degree offsets, leading to complexity in forming concurrent connections to the mid-plane while maintaining structural integrity and insertion tolerance.
Innovation Solution
The implementation of blind mate connection techniques using connector pairs with male and female connectors, where one side has a 'float' and the other is fixed, along with the use of brackets to control rotational movement and spring-loaded standoffs for alignment and attachment, allows for concurrent connections through the mid-plane, enabling efficient data communication and power distribution across differently oriented trays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If blind mate connectors are used to connect PCBs with different orientations (e.g., 90-degree offsets), then connectivity between node trays and switch trays is enabled, but alignment precision and insertion tolerance deteriorate
Solution Approach 1:
The connector assembly includes an outer housing that receives and positions an inner connector assembly. The inner connector is nested within the outer housing, which provides additional alignment features and structural support. This nested structure enables the connector to accommodate different orientations while maintaining precise alignment through the hierarchical positioning system.
Solution Approach 2:
The outer housing acts as an intermediary between the PCB and the inner connector, providing alignment features such as guide pins, chamfers, and positioning slots that mediate the connection process. This intermediary structure enables precise alignment even when connectors are inserted at different orientations, resolving the conflict between orientation flexibility and alignment precision.
2Ease of operation
If connection aids (chamfers, grooves, springs, standoffs) are added to blind mate connectors, then ease of connection is improved, but device complexity increases
Solution Approach 1:
Multiple connection aids (chamfers, guide pins, positioning slots, spring-loaded contacts) are merged into a single integrated connector assembly. The outer housing and inner connector work together as a unified structure where alignment features and electrical contacts are combined, reducing the number of separate components while maintaining ease of connection.
Solution Approach 2:
The connector assembly is designed to perform multiple functions simultaneously: alignment through guide pins and chamfers, mechanical retention through the snap-fit mechanism, and electrical connection through spring-loaded contacts. This multi-functional design improves ease of operation without proportionally increasing complexity, as a single assembly handles all connection requirements.
3Adaptability or versatility
If trays are inserted from both front and back of chassis, then chassis configurability is improved, but difficulty of detecting and measuring alignment increases
Solution Approach 1:
The connector incorporates visual alignment indicators such as colored alignment marks, transparent or translucent housing sections, and contrasting color features that make alignment status immediately visible. These visual cues enable operators to easily detect whether connectors are properly aligned during insertion from either front or back of the chassis, resolving the difficulty of alignment detection.
Solution Approach 2:
The connector includes pre-configured alignment features such as guide pins, positioning slots, and chamfered edges that automatically guide the insertion process and establish correct alignment before final connection. This preliminary alignment action occurs during insertion, making the final aligned state easily detectable and ensuring proper configuration regardless of insertion direction.
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
This solution facilitates efficient electrical connections between node and switch trays with improved insertion tolerance and configurability, allowing for flexible chassis configurations with varying compute and network resources, while minimizing stack space and enhancing stacking tolerances.
Implementation Method 1
A standoff is disposed in the opening with a spring surrounding the standoff, the spring within the opening to provide a spring-loaded mounting for the retainer
Implementation Method 2
A blind mate connector may include a chamfered leading edge to provide a 'guide' for another connector's trailing edge
Data Source
AI summary
Blind mate connection techniques and associated connectors are disclosed. Blind mate connectors provide connections where visual inspection at time of connection may not be available. Stacking tolerance increases when connectors have a different set of datums (e.g., a different relative orientation) relative to adjacent connectors. Different datums permit twinning two printed circuit boards (“PCBs”) prior to insertion into a slot of a chassis. Each connector may be attached to a respective PCB utilizing a spring and offset feature to provide a standoff on a respective PCB. Control of standoff and rotational movement (e.g., via brackets) allows each individual connector to have a “float” for improved insertion tolerance. Connector pairs may connect through an opening in a midplane while simultaneously connecting to the midplane. Switch trays and node trays may be inserted through opposing sides of a chassis and be connected through the midplane of that chassis.