Card Edge Connector Ejector Alignment Standoff
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Solution Overview
Problem
Card edge connectors face issues with ejectors failing to align properly due to dimensional tolerance between spindles and circular holes, leading to ineffective latching and ejection of memory modules during insertion and removal.
Innovation Solution
The design includes a pair of standoffs on the ejectors with horizontal surfaces that align with resisting surfaces on the tower portion, ensuring the centers of the spindles and circular holes overlap, allowing for proper rotation and latching, and preventing excessive rotation with oblique surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spindle diameter is made smaller than the circular hole diameter to facilitate assembly, then the ease of manufacture is improved, but the alignment precision between the spindle and circular hole deteriorates, causing the ejector to fail to rotate to the scheduled position and latch effectively
Solution Approach 1:
A standoff is introduced as an intermediary component between the ejector spindle and the tower portion circular hole. The standoff features a lower surface that contacts the spindle and an upper surface that contacts the resisting surface in the tower portion, acting as a precision alignment mediator that ensures accurate positioning despite the loose fit between spindle and hole
Solution Approach 2:
The design changes the dimensional parameters by creating a deliberate dimensional difference between the spindle diameter and circular hole diameter (making the spindle smaller), then compensates for the resulting alignment issue by introducing the standoff component that provides the necessary positioning through its specific geometry and contact surfaces
2Device complexity
If dimensional tolerance is allowed between the spindle and circular hole for easier manufacturing, then the manufacturing cost and complexity are reduced, but the ejector rotation accuracy deteriorates, preventing effective latching of the memory module
Solution Approach 1:
The standoff serves as a mediator component that bridges the ejector spindle and the tower portion structure. It provides a reliable positioning mechanism through its contact surfaces, ensuring that the ejector rotates to the correct position for effective latching while allowing the overall structure to remain relatively simple
Solution Approach 2:
The standoff is designed to automatically align and position the ejector spindle relative to the tower portion through its geometric features (lower surface contacting the spindle, upper surface contacting the resisting surface). This self-aligning mechanism ensures reliable latching without requiring complex external alignment systems or additional adjustment mechanisms
Data Source
AI summary
A card edge connector (100) includes an insulative housing, a set of contacts (2) retained in the insulative housing and an ejector (3). The insulative housing has a central slot (12) and at least one tower portion (13). The tower portion includes a pair of outer walls (131) and a receiving slot (135) formed between the outer walls. Each outer wall has a ladder with a circular hole (1312) formed therein. The ejector has a pair of spindles (312) received in the circular holes and a pair of standoffs (313). Each standoff has a horizontal surface (3131) abutting against a corresponding horizontal resisting surface (1314) formed on the ladder so as to make centers of the spindle and the circular hole overlap when the ejector rotates inwardly.