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MECHANICAL ALIGNMENT OF C5 ICs WITH THREE CORNER PEG CONCEPT USING LARGER SOLDER SPHERES

IP.com Disclosure Number: IPCOM000006259D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-19
Document File: 2 page(s) / 96K

Publishing Venue

Motorola

Related People

Authors:
Kiron R Gore Ved V. Gundotra Edward J. Hall

Abstract

1. C-5 ICs typically require robots with sophisticated look up vision capability for assembly onto circuit boards. Robots are necessary as silhouette imaging used by chip shooters are not accurate in that the edge to ball pattern tolerance is unreliable and adversely effects placement quality, 2. C5 assembly is considered a "blind" assembly as a visual aid cross check is not available to verify place- ment accuracy. This makes it diflicult not only for robots (by putting stringent placement accuracy requirements) but also for humans for a manual repair process.