Metal fusion bonding – With means to juxtapose and bond plural workpieces – Plural discrete workpieces
Patent
1980-03-21
1982-03-23
Baldwin, Robert D.
Metal fusion bonding
With means to juxtapose and bond plural workpieces
Plural discrete workpieces
228220, H01L 2152, H05K 334, B23K 3102
Patent
active
043208657
ABSTRACT:
A system for automatic and high production attachment of dies to heat sinks and other supporting structure includes an open ended gas tunnel having an inlet at one end, an outlet at the other end with means for indexing supporting structures step by step through the tunnel with heating means for heating the supporting structure in a first portion of the tunnel with automatic manipulating means for selecting and introducing first, a solder pre-form onto the heated support structure and then a die onto the melted solder with a source of forming gas continuously fed into the tunnel for controlling the atmosphere therein, and also for quickly quenching and cooling the solder after the die has been placed thereon. The method includes selecting a tunnel as above described, including a source of forming gas and selectively introducing support structures into one end of the tunnel indexing the structures through the tunnel while simultaneously heating them to the melting point of solder, introducing a solder pre-form onto the support structure and thereafter introducing a die onto the melted solder and cooling the solder while indexing the support structure and assembly through the tunnel.
REFERENCES:
patent: 3617682 (1971-11-01), Hall
patent: 3731867 (1973-05-01), Frisbie et al.
patent: 3920949 (1975-11-01), Clawson et al.
patent: 3964664 (1976-06-01), Butler et al.
Baldwin Robert D.
National Semiconductor Corporation
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