Fine pitch bonding tool for constrained bonding

Details Fine pitch bonding tool for constrained bonding Fine pitch bonding tool for constrained bonding

1997-05-22

1999-02-16

Heinrich, Samuel M.

Metal fusion bonding

Process

Plural joints

228 45, H01L 2160, H01L 21603

Patent

active

058711414

ABSTRACT:
A fine pitch capillary bonding tool for making ball bonds having a consistent bonded ball size even though the air balls may vary in diameter is provided. The convential shaped bonding tool is provided with a novel ball constraining recess in the working tip. When an air ball is bonded it is forced into the constraining recess which has a shoulder portion for exerting a downward bonding force. The ball being bonded extrudes vertically into the constraining recess without laterial extrusion which would create mashed balls of varying diameter.

REFERENCES:
patent: 4571688 (1986-02-01), Kashihara et al.
patent: 4974767 (1990-12-01), Alfaro et al.
patent: 5558270 (1996-09-01), Nachon et al.
patent: 5559054 (1996-09-01), Adamjee

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