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Integrated floating bar with bimetallic stiffener design and assembly for flexcable connector due to high actuation loading

IP.com Disclosure Number: IPCOM000022720D
Original Publication Date: 2004-Mar-26
Included in the Prior Art Database: 2004-Mar-26
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Abstract

A mezzanine assembly to attach C-Byte* connector with a land grid array is described. Assembly uses very high actuation load to apply contacts between two boards with minimum deflection.

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Integrated floating bar with bimetallic stiffener design and assembly for flexcable connector due to high actuation loading

A mezzanine assembly with high actuation load utilizes C-Byte* connector for board-to-board contact. This assembly requires high actuation force (1658 lbs) and results in appreciable board deflection. No known solution exists for minimizing the board deflection with known stiffener design.

     The mezzanine actuation assembly is shown in Figure 1 and Figure 2. These figures show multiple signals being brought from the VHDM** connectors to the board and routed through the C-Byte flexcable to a different board. In order to actuate the C-Byte flexcable and make proper connection, a force of 240 grams (nominal) per contact is required. This results in a total of 1658 lbs of actuation force being applied along the length of the C-Byte flexcable. This high force results in deformation of the board resulting in loss in signal integrity and land grid array (LGA) functionality. To minimize this deformation of the board, a stiffener made of aluminum with pockets incorporating steel bars along with aluminum floating bars are implemented. Experimental and analytical testing have indicated that this stiffener design along with floating bar provides the necessary stiffness necessary for signal and LGA integrity.

Aluminum Stiffener

Steel Bar

Floating Aluminum Bar

Figure 1. Mezzanine Assembly

1

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