Card Edge Connector Layout for Dense Slots and High-Speed Signals
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Solution Overview
Problem
Existing electrical connectors fail to accommodate increasing numbers of components in constrained spaces while maintaining signal integrity at high speeds, and they have limited tolerance for manufacturing errors such as coplanarity variations.
Innovation Solution
The design includes a housing with multiple slots and narrow latches, reinforcing members, and conductive elements with specific configurations that allow for closer placement of adjacent slots and improved mechanical strength, enabling higher component density and increased tolerance for manufacturing errors by using a shared wall with reduced thickness and conductive elements with mounting ends that can accommodate larger solder balls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of slots is increased to accommodate more components, then component density is improved, but the connector size and complexity increase
Solution Approach 1:
Adjacent slots share a common wall structure, merging what would otherwise be separate structural elements. This shared wall approach reduces the total amount of material and structural complexity needed compared to having completely separate walls for each slot, thereby increasing component density without proportionally increasing connector size.
Solution Approach 2:
The shared wall between adjacent slots serves multiple functions: it provides structural support for both slots simultaneously, acts as an electrical isolation barrier, and serves as a mounting surface for latches. This multi-functionality allows more slots to be packed into the same space without linearly increasing complexity.
2Quantity of substance
If the wall thickness between slots is reduced to increase component density, then slot spacing is improved, but mechanical strength deteriorates
Solution Approach 1:
The shared wall incorporates a latch mechanism that combines the wall structure with a locking function. The latch provides additional mechanical reinforcement to the thinned wall structure, compensating for the reduced wall thickness while enabling the slot spacing to be reduced for higher density.
Solution Approach 2:
The latch mechanism introduces a curved, pivoting element that distributes mechanical stresses more effectively than a rigid straight wall. The curved geometry of the latch allows it to absorb and distribute forces across a larger area, maintaining mechanical strength despite reduced wall thickness.
3Device complexity
If latches are made narrower to reduce connector size, then connector compactness is improved, but reliability of component retention deteriorates
Solution Approach 1:
The latch is designed as a pivoting mechanism rather than a fixed structure. This dynamic design allows a narrow latch to provide reliable retention by using rotational motion to engage and disengage, creating a mechanical advantage that compensates for the reduced latch dimensions while maintaining component retention reliability.
Solution Approach 2:
The pivoting latch acts as an intermediary mechanism between the compact connector structure and the component retention requirement. It translates small movements in a narrow latch into effective locking and releasing actions, ensuring reliable component retention despite the reduced latch size.
4Manufacturing precision
If conductive elements are configured with larger solder balls to accommodate manufacturing variations, then manufacturing precision tolerance is improved, but signal integrity at high speeds may deteriorate
Solution Approach 1:
The conductive element design changes the solder joint geometry by using larger solder balls with controlled configurations. This parameter change in solder joint size and shape provides greater tolerance for coplanarity variations during assembly while the controlled configuration maintains electrical performance for high-speed signals.
Solution Approach 2:
The conductive element has different properties at different locations: the solder ball portion is larger to accommodate manufacturing variations, while the trace portion is optimized for signal integrity. This local differentiation allows the same component to satisfy both manufacturing tolerance and high-speed signal requirements.
Data Source
AI summary
A connector for high density, high speed, and high performance electronic systems. The connector has multiple slots, each of which can receive a card. Terminals disposed on opposite sides of each slot connect the card inserted therein to a motherboard on which the connector is mounted. Each slot has a latch disposed at an end for retaining the card inserted therein when the latch is locked and releasing the card from the slot when the latch is unlocked. The connector has a reinforcing members configured to enhance the mechanical strength of the housing. Terminal tails are configured for solder ball attachments such that the terminals of adjacent slots are disposed closer. The tails are also configured such that a smaller solder area is needed on the motherboard. Such configurations improve signal integrity at higher speed and increases the tolerance of errors in the manufacturing process.