Browse Prior Art Database

Micro-Element with Excellent Mechanical and Electrical Properties

IP.com Disclosure Number: IPCOM000114747D
Original Publication Date: 1995-Jan-01
Included in the Prior Art Database: 2005-Mar-29
Document File: 2 page(s) / 97K

Publishing Venue

IBM

Related People

Kratt, R: AUTHOR [+2]

Abstract

Disclosed is a cable for transmitting electrical signals which exhibits good electrical as well as mechanical (resilient) properties at the same time.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 58% of the total text.

Micro-Element with Excellent Mechanical and Electrical Properties

      Disclosed is a cable for transmitting electrical signals which
exhibits good electrical as well as mechanical (resilient) properties
at the same time.

      By selecting the materials of the individual wires and a
special winding technique the properties of this cable can be
optimized for specific applications.  The cable can be used
especiallly as a contact and signal transmitting element when
electrically testing semiconductors on wafers, with LCD, MLC and
printed circuit boards.

      When using a cable as a signal transmitting or contact element
it has to exhibit good electrical and mechanical properties at the
same time.  If the cable is manufactured from only one material,
e.g., CuBe(2) or W, certain reservations have to be made concerning
the electrical conductivity.  If Cu or Ag is used as the cable
material, the cable exhibits very good electrical properties,
however, it is unsuitable for use as a resilient element.  To
optimize both properties, a cable is described wherein the single
wire (1) used to contact a substrate is made of a hard material such
as, e.g., W, Fe or CuBe(2), whereas the single wires (2), which
contribute to the improvement of the electrical properties, are made
of Ag or Cu.

      In order to be able to use the cable also for very small
contact pads (< 100 &mu.m), the diameter of the wire (1) to be
contacted must be less than 50 &mu.m.  Furthermore,...