Browse Prior Art Database

Flexible I/O Cable to Thin Film Connector

IP.com Disclosure Number: IPCOM000051210D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Bickford, HR: AUTHOR [+5]

Abstract

The Josephson device technology will require a reliable connection for multiple high speed I/O lines. The connector is comprised of spherical gold-plated copper contacts 10 soldered to I/O pads. Each I/O line 12 is a portion of the cable 14, which also includes a groundplane 16. The I/O pads 18 can be part of a thin film adapter 20. Each I/O line 12 and the groundplane 16 are pressed to the contacts 10 by a BeCu leaf spring assembly 22, which is a miniature, two-sided leaf-spring that acts simultaneously on both the signal line contacts and the ground plane contacts.

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Flexible I/O Cable to Thin Film Connector

The Josephson device technology will require a reliable connection for multiple high speed I/O lines. The connector is comprised of spherical gold- plated copper contacts 10 soldered to I/O pads. Each I/O line 12 is a portion of the cable 14, which also includes a groundplane 16. The I/O pads 18 can be part of a thin film adapter 20. Each I/O line 12 and the groundplane 16 are pressed to the contacts 10 by a BeCu leaf spring assembly 22, which is a miniature, two- sided leaf-spring that acts simultaneously on both the signal line contacts and the ground plane contacts.

This type of connection provides a demountable connection in contrast to that where soldering is used to connect the cable 14. This avoids the use of solder flux in the cable join so that weaknesses in the structure will not be attacked. Further, the clamping force is not transmitted to the thin film structure. Since each I/O line is now free to move independently, less force per contact is required, and differential contraction in the horizontal direction will result in a wiping action to assure good electrical contact.

This connector can be used to interconnect striplines on a flexible cable to coplanar striplines on a printed circuit board. Fig. 2 shows the striplines on a flexible cable 24 and the coplanar striplines 26. Fig. 3 shows the interconnection of these striplines.

In Fig. 2, the striplines on the flexible cable 24 are comprised of a groundplan...