Browse Prior Art Database

Method for an elastomer-filled tubular electrical interconnect

IP.com Disclosure Number: IPCOM000008477D
Publication Date: 2002-Jun-17
Document File: 4 page(s) / 904K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for an elastomer-filled tubular electrical interconnect. Benefits include improved reliability and decreased defects.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 50% of the total text.

Method for an elastomer-filled tubular electrical interconnect

Disclosed is a method for an elastomer-filled tubular electrical interconnect. Benefits include improved reliability and decreased defects.

Background

              Conventional micro-PGA contacts are primarily made of high-strength copper alloy with a very high modulus and limited elongation (5-20%). As the contact size shrinks, the bend radius-to-thickness ratio has become smaller while the metal stress level has risen to nearly the yield-strength level. The acceptable deflection of the metal contact now becomes smaller than the manufacturing tolerance of the socket and package flatness. As a result, the typical contact force varies greatly from contact to contact. In certain regions, contacts have high contact force while in other regions insufficient contact force occurs.

              In the conventional stamped contact design, only 5% of the sheet metal area makes up the final contact, and 95% of the sheet metal is wasted in the process. The cost of raw metal is relatively high. Approximately 50% of the socket cost is due to raw metal.

              Metal contacts typically require a standoff to limit deflection distance. As a package contacts the standoff, compression force transfers to the standoff and into the socket case. This condition is sometimes referred to as load loss.

              Conventionally, these problems are unsolved.

Description

              The disclosed method is a type of land grid array (LGA) socket with contacts that are cylindrical-shaped elastomer with metal wrapped on the outside. The contact is made from a long string of elastomer or plastic. The outside surface of the string is wrapped in metal foil. The string is c...