Electric heating – Heating devices – Tool or instrument
Patent
1978-04-12
1981-03-10
Bartis, A.
Electric heating
Heating devices
Tool or instrument
1565831, 1565832, 219 85D, 219 85F, 219228, 219243, 228 441A, 228179, 228180A, B23K 302, H05K 1304, H05B 324
Patent
active
042556449
ABSTRACT:
A tool for micro-soldering the connecting tags of an integrated circuit chip to corresponding terminals on a substrate by Joule heating includes a high conductivity bit having a planar bottom face adapted to contact the tags and press them against the terminals while applying sufficient heat to the tags to solder them to the terminals. The face has a perimeter and a centrally apertured portion adapted to receive and accommodate the circuit chip. The apertured portion forms a geometric loop on the planar face having opposite sides spaced from each other and adapted to contact the tags of the chip. A continuous high electrical conductivity flange extends upwardly from all portions of the perimeter of the face to provide rigidity to the bit.
A pair of high conductivity strips extend from facing segments of the flange for applying current to and removing current from the flange on opposite sides of the loop so that a pair of symmetrical current half loops extend about the face between the opposite sides thereof. Each strip has a reduced cross-sectional area symmetrical with the side of the face and removed from the intersection of the strip with the flange.
REFERENCES:
patent: 3050612 (1962-08-01), Eversole
patent: 3097286 (1963-07-01), Luke
patent: 3337716 (1967-08-01), Krause
patent: 3369954 (1968-02-01), Femer
patent: 3425887 (1969-02-01), Bowen
patent: 3551645 (1970-12-01), Stoll
patent: 3887783 (1975-06-01), Comette
"Solder Tip," by H. Carl, IBM Technical Disclosure Bulletin, vol. 10, No. 6, Nov. 1967, p. 853.
Bartis A.
Compagnie Internationale l'Informatique-CUU Honeywell Bull
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