Fishing – trapping – and vermin destroying
Patent
1992-05-29
1994-03-29
Chaudhuri, Olik
Fishing, trapping, and vermin destroying
437222, H01L 2152, H01L 2158, H01L 21603
Patent
active
052984648
ABSTRACT:
This invention resides in a curing process for adhesive on a housing member of a tape automated bonding section (TAB section). A force is applied to the housing member and then the entire TAB section is heated to a sufficient temperature and for a sufficient duration to cure the adhesive. The applied force, coupled with the heat squeezes a portion of the adhesive out from between the TAB section and the housing member and onto an inner portion of the outer leads before the adhesive cures. This embeds the inner portion of the outer leads with adhesive so that they are retained in alignment with and electrically isolated from each other.
The manner in which the force is applied to the housing member during the curing process is also a novel feature of the invention. The TAB section within the carrier frame is placed on a pedestal in a mounting fixture. A compressor block is then disposed against the TAB section. A compressor bar clamped over the compressor block and to the mounting fixture urges the compressor block against the TAB section. This also causes a centrally-located spring loaded plunger within the compressor block to push against the semiconductor chip but with a reduced force. This reduced force presses the chip against a housing member aperture so that a silver epoxy mounted in the aperture can evenly disperse over the semiconductor chip.
REFERENCES:
patent: 4099200 (1978-07-01), Koutalides
patent: 4672418 (1987-06-01), Moran et al.
patent: 4769345 (1988-09-01), Butt et al.
Doe Ralph W.
Gates Richard D.
Goddard Dennis P.
Hsu Shih C.
Schlesinger Randall L.
Chaudhuri Olik
Digital Equipment Corporation
Graybill David E.
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