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Browse Prior Art Database

SXLAT Chuck Pallet Lock

IP.com Disclosure Number: IPCOM000122056D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 71K

Publishing Venue

IBM

Related People

Weindelmayer, F: AUTHOR

Abstract

In the effort to automate the fluxing process prior to chip placement on a ceramic substrate, several problems were encountered. A vision system was used to map the solder pad positions on the substrates. An automatic flux head followed to leave flux on mapped solder pad areas of the ceramic substrate. In prior designs, it was difficult to assure that the substrate was in the same location during the mapping operation on a pallet; the vision system was thus required to search for the solder pads in a very large window on the ceramic substrates. A second problem occurred once the automatic flux head had deposited flux on the ceramic substrates; often the substrate would not separate from the flux head.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 60% of the total text.

SXLAT Chuck Pallet Lock

      In the effort to automate the fluxing process prior to chip
placement on a ceramic substrate, several problems were encountered.
A vision system was used to map the solder pad positions on the
substrates.  An automatic flux head followed to leave flux on mapped
solder pad areas of the ceramic substrate.  In prior designs, it was
difficult to assure that the substrate was in the same location
during the mapping operation on a pallet; the vision system was thus
required to search for the solder pads in a very large window on the
ceramic substrates.  A second problem occurred once the automatic
flux head had deposited flux on the ceramic substrates; often the
substrate would not separate from the flux head.  The flux head would
lift the substrate, and perhaps even the pallet on which the
substrate was disposed, when the automatic flux head retracted after
the fluxing operation.  The first problem significantly increases the
process time as well as impairing the ability of an automated process
to achieve repeatable and uniform results.  The second problem is
potentially disastrous as the pallet and substrate come crashing from
the tool.

      This disclosure teaches a chip placement chuck pallet lock
which uniformly presents the substrates for the vision system and
autofluxer as well as preventing the substrate from being displaced
upon the autofluxer pullout.  As shown in the Figure, a pallet having
positions for four ceramic subst...