Method and apparatus for batch solder bumping of chip carriers
First Claim
1. A method of forming solder bumps on contact pads of chip carriers, the method comprising the steps of:
- dispensing a plurality of chip carriers into an array of cavities of a planar holder;
applying a vacuum to hold said carriers in said cavities;
positioning the holder, with the chip carriers held therein, proximate to a plate having a plurality of arrays of dimples therein, each dimple containing a solder preform;
releasing the vacuum to place the pads in contact with the solder preforms; and
heating the preforms to form a solder bump on each pad.
1 Assignment
0 Petitions
Accused Products
Abstract
Chip carriers (10--10) are released from an end of a dispensing means (38) drawn across a holder (22) having a plurality of apertures (28--28) therein, to place a carrier in each aperture. Small solder spheres (58--58) are located in a plurality of dimples (56--56) of a planar plate (40) in arrays that are substantially the same as a plurality of bonding pad arrays (18--18) on the bottom surface of a plurality of chip carriers. A vacuum is applied to the holder (22) to hold the chip carriers (10--10) in the apertures (28--28) as the holder rotates to place the bonding pads (18--18) in contact with the solder spheres (68--68). The solder spheres (58--58) are reflowed by applying heat to form a solder "bump" (68) on each pad (18). The chip carriers (10--10) are then cooled and loaded into a plurality of the tubular members (39--39).
42 Citations
8 Claims
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1. A method of forming solder bumps on contact pads of chip carriers, the method comprising the steps of:
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dispensing a plurality of chip carriers into an array of cavities of a planar holder; applying a vacuum to hold said carriers in said cavities; positioning the holder, with the chip carriers held therein, proximate to a plate having a plurality of arrays of dimples therein, each dimple containing a solder preform; releasing the vacuum to place the pads in contact with the solder preforms; and heating the preforms to form a solder bump on each pad. - View Dependent Claims (2, 3, 4, 5)
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6. A soldering apparatus for forming solder bumps on contact pads of chip carriers, comprising:
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a plate having a plurality of arrays of dimples, each sized to receive a solder preform therein; a planar holder having an array of cavities therein and rotatably connected to the plate; means for dispensing a plurality of chip carriers in the cavities; a vacuum means for holding the chip carriers in the cavities; and means for releasing the vacuum to place the pads in contact with the solder preforms prior to heating the preforms to form a solder bump on each pad. - View Dependent Claims (7, 8)
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Specification