Browse Prior Art Database

Broken Chip Removal

IP.com Disclosure Number: IPCOM000120881D
Original Publication Date: 1991-Jun-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Puttlitz, KJ: AUTHOR [+2]

Abstract

Disclosed is a tool and a process for removing broken chips from modules which have the potential for damaging the polymer/thin-film top surface to which they are attached.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 76% of the total text.

Broken Chip Removal

      Disclosed is a tool and a process for removing broken
chips from modules which have the potential for damaging the
polymer/thin-film top surface to which they are attached.

      A technique which has been used in the past utilized a "Micro-
Chisel," which is an operator hand-held instrument. Removal is
achieved by scraping, prying, pushing, etc., which has the potential
for damaging the module surface, as it is an operator-dependent
process.

      The disclosed invention consists of a two-step procedure: A)
subdivision and B) separation.  These procedures can be automated,
except for set-up, thereby eliminating operator dependence.

      A)   The substrate which contains the chip 12 to be removed is
mounted in a fixture 8 capable of x-y motion as indicated in Fig. 1.
The broken chip 12 is scribed to a predetermined grid size 4 and
depth 3 by a diamond scribe 1 which is mounted to a z-motion slide 2.

      Independent of the configuration in which the chip is broken or
cracked, the subdivision step defines the largest chip segment that
must be removed.

      B)   The second stage consists of separating and removing the
chip fragments from the substrate surface (Fig. 2).  A curved knife 7
is positioned such that the tip is located between the scribed chip
12 and substrate via the z-motion slide 2.  Care must be exercised to
ensure contact is not made with the substrate surface.  A miniature
heat source 5 mounted...