Browse Prior Art Database

Inexpensive Chip Package

IP.com Disclosure Number: IPCOM000100859D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Gillett, JB: AUTHOR

Abstract

Personal computers need the ability to inexpensively increase memory. Today this is accomplished by plugging in small printed circuit cards containing memory chips into connectors mounted on the base memory card. The connectors and their assembly to the card represent a cost adder, particularly since the connectors must be there whether they are used or not.

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This is the abbreviated version, containing approximately 71% of the total text.

Inexpensive Chip Package

       Personal computers need the ability to inexpensively
increase memory.  Today this is accomplished by plugging in small
printed circuit cards containing memory chips into connectors mounted
on the base memory card.  The connectors and their assembly to the
card represent a cost adder, particularly since the connectors must
be there whether they are used or not.

      Memory chips may be mounted on a flexible film carrier with
printed conductors connecting the chip pads to an Input/Output (I/O)
area on the substrate.

      Fig. 1 shows how the film becomes a part of the connector by
having a set of gold-plated contacts on the film.  Behind the section
of film carrying the contacts is a piece of resilient elastomer.  A
corresponding pattern of contacts is gold-plated onto the card
intended to receive the additional memory.

      The film is bonded to a plastic carrier, which has extensions
with snap-in fasteners (Fig. 2).  When the fasteners are pressed
through holes in the card, they automatically register the contacts
on the card to those on the memory module.  As the module is
inserted, the standoffs on the fasteners ensure that just the right
amount of compression of the elastomer occurs to maintain a good
contact.

      A variation is shown in Fig. 3, in which the film is bonded to
a sheet of elastomer, which serves not only as the resilient spring
to the contacts, as described above, but also to permit a heat...