Browse Prior Art Database

Method for Producing Metal Wires with Locally Varying Diameter

IP.com Disclosure Number: IPCOM000115882D
Original Publication Date: 1995-Jul-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Lueck, P: AUTHOR [+5]

Abstract

Disclosed is a laser-based method for producing thin metal wires with locally varying diameter. Such wires are preferably used in a so-called "Si-Probe", a multiple needle tester for electrical continuity check of e.g., multi ceramic modules.

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Method for Producing Metal Wires with Locally Varying Diameter

      Disclosed is a laser-based method for producing thin metal
wires with locally varying diameter.  Such wires are preferably used
in a so-called "Si-Probe", a multiple needle tester for electrical
continuity check of e.g., multi ceramic modules.

      A Si-Probe comprizes a housing with a plurality of thin wires
being undulatedly passed through the housing.  A pressure type of
stress typically leads to the so-called "buckling beam" stiffness as
shown in Fig. 1.  The array pattern of the wire ends in the xy-plane
and must be fine enough to allow contacting of today's and the future
modules.  Therefore, wire diameters as small as 25 &mu.m are
required.

      During testing, the electrical signals typically have to be
transported along about 1m to the electronic unit.  A wire of a
length of approximately 1m and 25 &mu.m in diameter however shows an
ohmic resistance which is too high for signal transmission.  So far
it was not possible to manufacture a copper wire with a well-defined
diameter of 25 &mu.m along an exactly defined length of e.g., 30 mm
and with a diameter twice as big along the remaining main part of the
wire length.  Electrically coupling two wires of different diameters
is very difficult due to the small diameter of the wire and
drastically reduces the reliability of the multiple needle tester.

The laser-based method comprises the steps:
  1.  Providing a layer of polymeri...