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Browse Prior Art Database

Self-induced repair using customized probing fixture and relay array

IP.com Disclosure Number: IPCOM000112379D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Chen, JC: AUTHOR [+2]

Abstract

1. Holder and electrolyte container. 2. Printed circuit board. 3. Pads of a line under SIR.4. Lineunder SIR. 5. Other lines. 6. Fixture. 7. Probes. 8. Relay array. 9. SIR power supply. 10. Electrolyte.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Self-induced repair using customized probing fixture and relay array

       1.  Holder and electrolyte container.  2.  Printed circuit
board.  3.  Pads of a line under SIR.4.  Lineunder SIR.  5.  Other
lines.  6.  Fixture.  7.  Probes.  8.  Relay array.  9.  SIR power
supply.  10.  Electrolyte.

      By using a customized probing fixture and a relay array instead
of a pair of robot probes to access the ends of lines, the equipment
cost of the self-induced repair process can be greatly reduced.  This
method may be used for low-price high-volume printed circuit board
manufacturing.

      It was shown that with Self-Induced Repair (SIR) method, the
near-opens (constrictions) in circuits can be self-healed without
locating them [1].  With a simple seeding step, repair of opens and
making customized interconnections (engineering changes) are becoming
possible [2].  The quality of the SIR repair and engineering changes
is as good as the original lines.  The electronics and control system
cost and the materials cost are very low.  The major cost is the
equipment, it requires the means to access the ends of a defective
line.  In previous Patents, a movable probing station (comprises a
pair of high-precision robot fingers) is required [2].  Such a
probing system is expensive.  Although it is effective for high-end
circuits, and necessary for low-volume products, for low-end
large-volume products, the equipment is too costly.  Therefore, to
reduce the cost of apparatus is the key to expand the SIR technology
to low-end products.

      Description of the Invention (Figure) - The new approach is to
use a customized probing fixture to access all the end points of
lines on the PCB.  To access a specific...