Precisely aligned lead frame using registration traces and pads

Details Precisely aligned lead frame using registration traces and pads Precisely aligned lead frame using registration traces and pads

1992-05-21

1994-01-04

Kight, III, John

Radiation imagery chemistry: process, composition, or product th

Registration or layout process other than color proofing

430311, 430313, 430318, 430319, 430394, 1566591, 428209, 428220, 257666, 257678, 257701, G03F 900, G03C 500

Patent

active

052758974

ABSTRACT:
Assemblies of aligned tape automated bonding frames on a substrate, and a method of aligning a tape automated bonding frame to connection sites on the substrate. The method includes photolithographically patterning and etching metal to form a first pattern of signal leads and a second pattern of alignment leads. A semiconductor chip is bonded to the inner lead ends of the first pattern. Metal on a substrate is photolithographically patterned and etched to provide a third pattern of substrate connection sites and a fourth pattern of registration pads. The fourth pattern of registration pads has geometric and dimensional features which precisely correspond to those of the alignment leads. Moreover, the spatial relationship of the third and fourth patterns correspond to the spatial relationship of the first and second patterns. The corresponding geometric and dimensional features of the second and fourth patterns are aligned, whereafter the registration pads and the alignment leads are soldered together. The attachment of the second and fourth patterns provide fixed registration of the first and third patterns. Preferably, the substrate includes redundant registration pads to facilitate replacement of a defective semiconductor chip.

REFERENCES:
patent: 4707363 (1987-10-01), Barber et al.
patent: 4786545 (1988-11-01), Sakuma et al.

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