Browse Prior Art Database

Pluggable Flex Circuit Connector with Sequencing Features

IP.com Disclosure Number: IPCOM000102406D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 4 page(s) / 175K

Publishing Venue

IBM

Related People

Babuka, R: AUTHOR [+5]

Abstract

Disclosed herein is a means for providing a flex circuit card edge connector with contact wipe, and power connections separate from signal connections. Contact force during wipe, as well as signal and power connections, can all be sequentially applied.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Pluggable Flex Circuit Connector with Sequencing Features

       Disclosed herein is a means for providing a flex circuit
card edge connector with contact wipe, and power connections separate
from signal connections.  Contact force during wipe, as well as
signal and power connections, can all be sequentially applied.

      Plugging motion of a card in the connector completes the
connections between a flex circuit attached to a board and the card.
The plugging force and motion is supplied by turning a retention
screw at each end of the connector.  The screws engage a structural
mounting member present in the electronic package.  The motion wipes
rows of pads with suitable contact geometry and metallurgy on the
card against pads with suitable metallurgy and geometry on the flex
in a similar pattern.  The pads are electrically connected via
circuit traces to components on the card and plated thru holes on the
flex.  These plated thru holes are soldered to either pins or lands
on a board to which the card is connected to.

      Contact force between card and flex pads in the plugged
position is generated by remote force-generating springs on both
sides of the card imbedded in a structural dust cover attached to the
card, shown in Fig. 2.  When fully plugged, the contact force springs
impinge against backer plates that distribute the forces to an array
of elastomer bumps.  The elastomer bumps impinge against the flex
circuit to press card and flex contact pads together.  The elastomer
bumps absorb tolerance variation in the contact-force direction.

      Plugging the card first causes the contact springs to spread
apart over the connector body, depicted in Fig. 2. Pushing the card
farther pushes the contact force springs onto the backer plates.  The
backer plates, initially held away from the card by light springs,
force the flex and card pads together at a predetermined spring
deflection.  Over the rema...