Browse Prior Art Database

Zero Insertion Force Socket for Pin Grid Array Modules

IP.com Disclosure Number: IPCOM000115767D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 4 page(s) / 124K

Publishing Venue

IBM

Related People

Nguyen, A: AUTHOR [+3]

Abstract

The number of I/O pins required both in Single Chip Module (SCM) and Multi Chip Module (MCM) has been increasing due to high integration levels at device level. The number of I/O's required may be more than 1000 pins. To socket such a modules presents a problem due to high insertion force that may run to hundreds of pounds. Zero Insertion Force (ZIF) sockets provide a solution to the problem of high insertion forces. The disclosed concept provides a simple and cost-effective design for a ZIF socket.

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This is the abbreviated version, containing approximately 67% of the total text.

Zero Insertion Force Socket for Pin Grid Array Modules

      The number of I/O pins required both in Single Chip Module
(SCM) and Multi Chip Module (MCM) has been increasing due to high
integration levels at device level.  The number of I/O's required may
be more than 1000 pins.  To socket such a modules presents a problem
due to high insertion force that may run to hundreds of pounds.  Zero
Insertion Force (ZIF) sockets provide a solution to the problem of
high insertion forces.  The disclosed concept provides a simple and
cost-effective design for a ZIF socket.

      Fig. 1 shows an exploded view of such a socket design.  It
consists of three parts, i.e., contact carrier plate, a slide cap,
and an actuating screw.  The module is dropped into sliding cap in
unlocked or unactuated position.  The actuating screw is then rotated
so that module pins move to engage the two point contact.  Fig. 2
shows the three states of the contact mating positions.

      The contact design details are given in Fig. 3, while Fig. 4
and Fig. 5 show the sliding cap and contact carrier plate details.

      A 389-pin working model of the zero insertion force connector
has been fabricated to demonstrate the concept feasibility.  The key
to the design is the wireform dual point contact which can be
fabricated in a two-step die.  There are only three parts for the
whole connector.  The simple contact geometry and reduced part count
makes it a very cost effective design w...