Metal fusion bonding – Process – Plural joints
Patent
1985-02-08
1987-01-20
Ramsey, Kenneth J.
Metal fusion bonding
Process
Plural joints
228264, B23K 112, H01L 2348
Patent
active
046375422
ABSTRACT:
A solder/desolder tool has a heater block supporting a handle at its upper end and a heating plate at its lower end. The heating plate is thermally engaged by heating elements housed in the heater block. An array of pin relief apertures are formed in the heating plate. Retractable clamps are pivoted to the heater block for clamping a leadless chip against the heating plate. The leadless chip has an array of input/output sockets corresponding to the array of pin relief apertures. A method is disclosed for soldering the chip sockets to a corresponding array of pins supported by a PC board. According to the method, solder balls are loaded in the chip sockets, and the chip is then secured in the tool to reflow the solder balls to form solder plugs. The solder plugs are then set upon the upper ends of the pins and melted by the heating plate so that solder joints are formed between the pins and sockets. The chip is released from the tool to allow the solder joints to cool. A desoldering method is disclosed wherein the tool is secured to a chip which is in a soldered condition (i.e., the chip sockets are soldered to the pins). The heating plate applies heat to the solder joints about the individual circumferences of the pins. Once the solder joints reach reflow temperature, the chip can be removed from the pins.
REFERENCES:
patent: 3576969 (1971-05-01), Surty
patent: 3582610 (1971-06-01), Eckles
patent: 3632973 (1972-01-01), O'Keefe
patent: 3990863 (1976-11-01), Palmer
Borning Jeffrey M.
Breske Carl D.
Atlass M. B.
Control Data Corporation
Genovese J. A.
Niebuhr F. W.
Ramsey Kenneth J.
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