Browse Prior Art Database

High Density/High Performance Cable I/O Connector System

IP.com Disclosure Number: IPCOM000036474D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 5 page(s) / 221K

Publishing Venue

IBM

Related People

Babuka, RT: AUTHOR [+5]

Abstract

This connector system provides a large number of I/O contacts and occupies the same circuit board area as a similar system which provides only substantially fewer I/O contacts. This was accomplished by implementing a series of changes and improvements as follows. (Image Omitted)

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High Density/High Performance Cable I/O Connector System

This connector system provides a large number of I/O contacts and occupies the same circuit board area as a similar system which provides only substantially fewer I/O contacts. This was accomplished by implementing a series of changes and improvements as follows.

(Image Omitted)

The contact spacing was reduced from a 2.5mm x 2.5mm to 2.5mm x
1.25mm grid. This was made possible by the development of a 1.25mm offset tail common-ground narrow-width spring contact. These contacts and straight tail narrow width signal spring contacts are inserted in alternate rows into plated through holes on a 2.5mm staggered grid. This contact arrangement translates the 2.5mm staggered plated-through- hole board pattern to a 2.5mm connector pattern which properly mates with paddle cards on a 2.5mm spacing and having pads on a 1.25mm spacing.

(Image Omitted)

The paddle card edge to spring housing locating system significantly reduces the potential for misalignment of the contact spring and contact pads which could result in system failures.

The increase in I/Os permits using a 1:1 ground-to-signal ratio, resulting in superior electrical performance.

In this system (see Figs. I and II), eleven adjacent cable card assemblies (2) on 2.5mm centers, each consisting of a printed circuit card (3) having a set number of I/O contact tabs (18) on 1.25mm spacing assembled with a plurality of high performance signal cables (29) and enclosed in plastic housing (28) are individually bias loaded horizontally against cable card datum "A" (19) in super grouper (20) and its datum "A" (26) (see Fig. II) through preferential load/latch- spring (7).

(Image Omitted)

Vertical containment of cable card assemblies (2) (see Fig. II) in super grouper (20) occurs when load latch spring (7) and latch spring (1) engage super grouper latch points (30) and (31). The primary card assembly vertical positioning and mechanical support, necessary to withstand vertical con...