Browse Prior Art Database

Ball Shorting Block

IP.com Disclosure Number: IPCOM000121442D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 30K

Publishing Venue

IBM

Related People

Beaumont, GD: AUTHOR [+2]

Abstract

This article describes a ball shorting block which is used to electrically short a number of points together for performing electrical testing on substrate devices or other parts.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Ball Shorting Block

      This article describes a ball shorting block which is
used to electrically short a number of points together for performing
electrical testing on substrate devices or other parts.

      As circuitry becomes increasingly miniaturized and more dense,
it becomes more difficult to perform electrical tests making use of
input/output points or leads or other such elements on substrates.
One such test requires that all of the input/output points be shorted
together.

      The ball shorting block consists of a bath of conductive balls
on which the part to be tested is seated. A diaphragm at the bottom
of the bath deflects and keeps the balls in contact with the part to
be tested even if the surface of the part is not perfectly flat.
With all of the input/output points shorted together, the required
electrical tests can then be performed from the top of the substrate.

      The only real limitation with this device is that the diameter
of the balls must be smaller than the diameter of the input/output
points. There is no need for the spacing or location of the
input/output points to be accurate as the balls will appropriately
position themselves to make contact with them. Air pressure or a
spring may be used instead of the diaphragm to maintain the balls in
contact with the part to be tested or a combination of diaphragm, air
pressure and spring.