Browse Prior Art Database

Bimetal Component Removal

IP.com Disclosure Number: IPCOM000119813D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Lidestri, KA: AUTHOR [+3]

Abstract

Disclosed is a unique bi-metallic fixture which, when used in conjunction with an existing IR tool aperture, permits the removal of very small back-bonded components, e.g., capacitors, from the surface of multi-component carriers, without the use of new processes and tooling.

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This is the abbreviated version, containing approximately 59% of the total text.

Bimetal Component Removal

      Disclosed is a unique bi-metallic fixture which, when
used in conjunction with an existing IR tool aperture, permits the
removal of very small back-bonded components, e.g., capacitors, from
the surface of multi-component carriers, without the use of new
processes and tooling.

      A current technique for removing semiconductor chip devices
from electronic module surfaces (*) cannot be successfully applied to
the removal or replacement of capacitors, which are much smaller in
size than chips and of a different material (BaTi03).  A common
device replacement technique, one compatible with that used in the
removal of chips, is desirable.  This involves the use of an IR
source that localizes and focuses the energy on the backside of the
device, thereby permitting the C-4 (controlled-collapse chip
connection) connector balls to become molten through conduction and
the chip to be withdrawn from the surface via vacuum.  The disclosed
invention consists of a bi-metallic hat (see Fig. 1) which, when used
in conjunction with the current IR tool aperture, provides an
effective method of component removal.  The fixture shown consists of
a stainless steel top plate 1 and bi-metallic sides 2.  It can have
the two general configurations shown in Figs. 2 and 3. In Fig. 2, the
bi-metal strips are oriented and shaped to form a hat with sides, the
lower-expanding metal 3 facing inward.  In Fig. 3, bi-metallic strips
4 are used only on the sides...