Method and system for machine vision-based feature detection and mark verification in a workpiece or wafer marking system
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United States of America Patent
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app pub date -
Oct 9, 2006
filing date -
May 17, 2002
priority date (Note) -
Abandoned
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Abstract
A precision laser based method of marking semiconductor wafers, packages, substrates or similar workpieces is provided. The workpieces have articles which may include die, chip scale packages, circuit patterns and the like. The marking occurs in a workpiece marking system and within a designated region relative to an article position. The method includes determining at least one location from which reference data is to be obtained using (a) information from which a location of an article is defined, and (b) a vision model of at least a portion of at least one article. Reference data is obtained to locate a feature on a first side of (a second) workpiece using at least one signal from a first sensor. The method further includes positioning a marking field relative to the workpiece so as to position a laser beam at a marking location on a second side of the workpiece. The positioning is based on the feature location. A predetermined pattern is marked on the second side of the workpiece using a laser marking output beam. The workpiece is a semiconductor wafer, and the step of determining includes: measuring at least one feature in an image obtained from a first wafer portion; relating the measured feature to a wafer map; and storing the data for use when marking of wafers substantially identical to the first wafer.
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- 15 United States
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Patent Owner(s)
Patent Owner | Address | |
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ELECTRO SCIENTIFIC INDUSTRIES INC | 13900 NW SCIENCE PARK DRIVE PORLTLAND OR 97229 |
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- [Patents Count]
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Nemets, Chris | Camarillo, CA | 4 | 67 |
Pukmel, Michael | Burlington, MA | 2 | 34 |
Woelki, Michael | Stow, MA | 7 | 202 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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