Browse Prior Art Database

Probe Tip MCM Product

IP.com Disclosure Number: IPCOM000108152D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 48K

Publishing Venue

IBM

Related People

Sipe, M: AUTHOR [+2]

Abstract

An auto chip placement tool, designed to place chips into substrates with rotating probe assemblies, is described. Both small and large chips are to be placed by the tool. Using probe tips designed to place smaller chips, the larger chips will lose their registration to the probe tip and placement will then be inconsistent and unacceptable. Through experimentation, it was found that smaller chips did not have enough bearing surface for vacuum adhesion of the larger chips. Misplacement was caused by the inertial force exerted by the linear motor during placement transit, causing the chips to move enough to have placement inconsistency.

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Probe Tip MCM Product

      An auto chip placement tool, designed to place chips into
substrates with rotating probe assemblies, is described. Both small
and large chips are to be placed by the tool. Using probe tips
designed to place smaller chips, the larger chips will lose their
registration to the probe tip and placement will then be inconsistent
and unacceptable. Through experimentation, it was found that smaller
chips did not have enough bearing surface for vacuum adhesion of the
larger chips.  Misplacement was caused by the inertial force exerted
by the linear motor during placement transit, causing the chips to
move enough to have placement inconsistency.

      While two types of rotating probes to accommodate the various
sized chips was a possible solution, it would require lengthy
down-time change over.  A simple augmented tip cover to go the
existing rotating probes was designed to augment the bearing surface
between the chip and the probe. It also maintains the vacuum force
for adhesion during linear motor transit.

      Disclosed anonymously.