Browse Prior Art Database

Lombard Serpentine Flextape Vacuum Hold

IP.com Disclosure Number: IPCOM000113033D
Original Publication Date: 1994-Jul-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Horton, RR: AUTHOR [+3]

Abstract

The Lombard Serpentine Flextape Vacuum Hold, consists of a serpentine designed cut, into a vacuum chamber, as it is shown in Fig. 1. The width of the cut is of .005" on a centerline pattern of .016" x .074" and the total length of 1.531". The same pattern is repeated in a quadrant of 4 places as shown in Fig. 2. Note that the .005" width is achieved through a wire EDM tool.

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Lombard Serpentine Flextape Vacuum Hold

      The Lombard Serpentine Flextape Vacuum Hold, consists of a
serpentine designed cut, into a vacuum chamber, as it is shown in
Fig. 1.  The width of the cut is of .005" on a centerline pattern of
.016" x .074" and the total length of 1.531".  The same pattern is
repeated in a quadrant of 4 places as shown in Fig. 2.  Note that the
.005" width is achieved through a wire EDM tool.

      The formed Flex tape is accurately placed unto the serpentine
fixture via locating and registering dowel holes, then vacuum is
manually turned on to secure the flex tape poliemide side firmly, in
direct relation to the substrate solder pads.

The following is accomplished:

1.  Eliminate the flex tape smile effect caused by the previous
    slotted vacuum design, also it insures the linear flatness of
    flex tapes therefore minimizing any stress in delicate flex tape
    fingers contacts.

2.  All flex tape finger contacts (171 per side count) remain
    coplanar to VCOS-E substrate solder pads, therefore the lift of
    substrate operation to present the solder pads to finger
    contacts, is now repeatable for inner leads bond operation and
    successful.