Preparing MCM hat for removal

Details Preparing MCM hat for removal Preparing MCM hat for removal

2005-06-21

2005-06-21

Cooke, Colleen P. (Department: 1754)

Metal fusion bonding

Process

Repairing, restoring, or renewing product for reuse

C228S264000, C029S426600, C029S402080, C029S402210

Reexamination Certificate

active

06908025

ABSTRACT:
A process and apparatus for preparing an MCM for hat removal where the hat includes a piston thermally coupled to a corresponding chip. The apparatus includes a heater positioned to reflow a joint between the piston and a base of the hat; and a retractor for biasing the piston away from the corresponding chip. Implementation of the apparatus and process prevent a piston, as it moves across the top of a corresponding chip during mechanical shear to remove the hat, to impact chip(s) and surrounding components. In addition, since piston(s) are retracted, the likelihood of piston impact with or cracking of a chip is reduced. In addition, cutting into a corresponding chip having a tilted back surface is prevented. The need to replace chips and other electronic components when making other repairs may, therefore, be greatly reduced.

REFERENCES:
patent: 5239747 (1993-08-01), Ewers
patent: 5461544 (1995-10-01), Ewers
patent: 5722579 (1998-03-01), Yu et al.
patent: 6031729 (2000-02-01), Berkely et al.
patent: 6046410 (2000-04-01), Wojnarowski et al.
patent: 6492620 (2002-12-01), Lau

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