DIMM Retainer Constraining Top Edges for Vibration Stability
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Solution Overview
Problem
Conventional connectors for dual in-line memory modules (DIMMs) face challenges in preventing unwanted movement during operation, leading to intermittent electrical discontinuity, especially with taller DIMMs, due to inadequate constraints on the upper and top edges.
Innovation Solution
A DIMM retainer system that includes vertical and horizontal members forming a U-shaped, T-shaped, or framed structure to constrain the top edges of DIMMs inserted into connectors, using fasteners or spacers for attachment, thereby inhibiting movement and ensuring electrical continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional connectors are used to couple DIMMs with PCB, then removability is enabled, but high dynamic risk of DIMM movement occurs during operation
Solution Approach 1:
A retainer structure is introduced as an intermediary component between the connector and the DIMM. The retainer includes vertical members that attach to the connector and a horizontal member that extends over the top edge of the DIMM, providing mechanical constraint while preserving removability. This mediator resolves the contradiction by enabling both easy insertion/removal and operational stability.
2Quantity of substance
If taller DIMMs (2U, 4U) are used to increase memory capacity, then storage capacity is improved, but lateral movement risk increases due to inadequate constraints on upper and top edges
Solution Approach 1:
The retainer structure adds a new dimensional constraint by extending a horizontal member over the top edge of the DIMM in the lateral direction. This creates a physical barrier in the previously unconstrained lateral dimension, preventing unwanted movement of taller DIMMs while preserving vertical insertion and removal capability.
3Reliability
If retainer structure is added to constrain DIMM movement, then electrical continuity is improved, but device complexity increases
Solution Approach 1:
The retainer is designed as a segmented structure with distinct vertical members that attach to the connector and a horizontal member that constrains the DIMM. This segmentation allows the retainer to be attached to existing connectors without replacing the entire connector assembly, minimizing the increase in device complexity while achieving the reliability improvement.
Data Source
AI summary
A retainer to inhibit movement of dual in-line memory modules (DIMMs) that are removably inserted into connectors attached to a printed circuit board (PCB) of a system. Inhibiting movement of the DIMMs, especially taller DIMMs, such as the higher height 2 U and 4 U DIMMs, mitigates the effects of operational vibration causing intermittent electrical discontinuity between DIMM and the PCB. The retainer inhibits movement of DIMMs at the connector component level by constraining all or a portion of top edges of DIMMs inserted into connectors. The retainer is implemented independently of the design of the system-level chassis. The retainer is shaped into any of a bracket or frame from multiple rigid horizontal, vertical and oblique members that permit airflow to the DIMMs and connectors retained therein.