Laser assisted heater bar for multiple lead attachment

Details Laser assisted heater bar for multiple lead attachment Laser assisted heater bar for multiple lead attachment

1988-12-13

1990-01-16

Albritton, C. L.

Electric heating

Metal heating

By arc

21912185, 21912164, 21912163, 219 8513, 219 8516, B23K 2600

Patent

active

048945099

ABSTRACT:
A laser assisted miniature heater 10 includes an elongated hollow bar 12 having a high thermal conductivity and a supporting member 14 for conveying an optical fiber 16 which transmits laser radiation to an interiorly disposed hollow cavity 18. The interior surfaces 20 of the cavity 18 are reflective to the laser radiation such that the radiation undergoes repetitive internal reflections along a longitudinal axis of the bar 12. While repetitively reflecting within the cavity 18 the laser radiation is gradually absorbed into the walls of the cavity 18. The absorption of the laser radiation induces a uniform heating of the bar 12 to a temperature which exceeds the melting temperature of eutectic solder. The outer surface 22 of the bar 12, when placed in contact with a plurality of component leads which are each adjacent to a respective solder-bearing bonding pad, induces a melting of the solder and the physical and electrical coupling of the leads to their associated bonding pads.

REFERENCES:
patent: 3509317 (1979-04-01), Valsamakis et al.
patent: 3522407 (1970-08-01), Costello
patent: 3657508 (1972-04-01), Studnick
patent: 3718800 (1987-02-01), Costello
patent: 3723697 (1973-03-01), King
patent: 3742181 (1973-06-01), Costello
patent: 4534811 (1985-08-01), Ainslie et al.
patent: 4785156 (1988-11-01), Benko et al.

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