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US 4,510,673 AGranted
Laser written chip identification method
AssigneeInternational Business Machines Corporation
InventorsAlan J. Shils, John P. Ianni, Jr.
Life of this patent
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Abstract
A system of identifying each chip with identification data that is both human and machine readable. The chip identification is then used in sorting, storing, testing, assembling and failure analysis. The identification usage at these process steps eliminates chip part number mix-up and placement. It provides data used for quality control.
Claims10
A method of producing a semiconductor device comprising the steps of:
- providing a plurality of semiconductor chips on a wafer and testing said chips on said wafer to determine their useability;
- writing on each chip identification data that may be read by a human or a machine;
- dicing said wafer to separate said chips;
- selecting and placing said chips into a storage device and reading said identification data to verify the proper location and orientation of said chips in said storage device;
- removing said chips from said storage device and placing said chips on a substrate;
- reading said identification data to verify the correct location and orientation of each chip on said substrate and, if incorrect, re-locating and/or re-orienting said chip;
- and
- joining said chips to said substrate.
5 more elements
Dependencies are inferred from the claim text.