Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1995-11-17
1997-01-07
Williams, Hezron E.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73827, 228 45, G01N 300
Patent
active
055919200
ABSTRACT:
A novel pull strength tester is incorporated into an automatic wire bonder for performing pull strength tests during production bonding operation. The pull strength tester is provided with a control for automatically applying increments of pull force on a fine wire after making a bond. The control senses the elongation of the fine wire as a result of the force applied and is capable of terminating the pull test at a predetermined threshold value or continuing to increase the force until a break occurs. After each increase in force, a continuity circuit determines if the wire has broken at the bond or the bond has lifted off the bonding target. The system employs the information to determine if a proper bond was made and/or if a short tail was made which could affect the subsequent attempt to form a proper ball for a subsequent first bond.
REFERENCES:
patent: 3840169 (1974-10-01), Steranko et al.
patent: 4786860 (1988-11-01), Zimmerman
patent: 5326015 (1994-07-01), Weaver et al.
Fokin Igor
Munakata Hiroshi
Perlberg Gil
Price Susanne F.
Razon Eli
Biegel Ronald L.
Kulicke and Soffa Investments, Inc.
Sowell John B.
Williams Hezron E.
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