Browse Prior Art Database

Circuit Board Shorts/Opens Repair Head

IP.com Disclosure Number: IPCOM000101523D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 3 page(s) / 101K

Publishing Venue

IBM

Related People

Kropa, WT: AUTHOR [+4]

Abstract

Disclosed is a repair head allowing for the sequential repair of both circuit board shorts and opens on the same X-Y table. Transportation cost of product handling is therefore reduced.

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This is the abbreviated version, containing approximately 60% of the total text.

Circuit Board Shorts/Opens Repair Head

       Disclosed is a repair head allowing for the sequential
repair of both circuit board shorts and opens on the same X-Y table.
Transportation cost of product handling is therefore reduced.

      This process head combines defect verification, open circuit
repair, and short circuit repair into a single operating unit.

      This system is linked to an optical tester.  Defect data (X-Y
axes coordinates) from the tester address the X-Y table to all defect
sites for initial operator inspection. Once this inspection is
accomplished, repair cycles can begin.

      Referring to Figs. 1 and 2, the center optics 4 portion of this
assembly is used for operator verification of a circuit defect, be it
an open or a short.

      If a short is evident, the operator will lock into machine
memory the X and Y axes coordinates of the beginning and end of the
shorted circuit to be cleared.  The X-Y table, to which this process
head is mounted, will offset from the center optics to the defect
site.

      The delete mechanism 2 will then automatically drive down to
the defective area of a core, or composite, imbedding the
micro-cutter 5 to a proper position below the surface of the product.

      The X-Y table now travels to a location previously set by the
operator, thus removing the short.

      Following the repair, the delete mechanism retracts, and the
X-Y table repositions the repair site again under the c...