Measuring and testing – Vibration – By mechanical waves
Patent
1983-10-24
1985-12-17
Levy, Stewart J.
Measuring and testing
Vibration
By mechanical waves
228 11, 228 45, 228 10, G01M 700, B23K 106
Patent
active
045585962
ABSTRACT:
Apparatus is provided for monitoring the bond condition of a fine aluminum wire being ultrasonically bonded to an electrode pad. The apparatus comprises a counter for generating a start and stop signal indicative of a predetermined plurality of cycles from the ultrasonic generator of the ultrasonic bonder. A stable source of pulses is applied to a second counter which is started and stopped by the start and stop signal. The count stored in the second counter is read out to a microprocessor and is indicative of the frequency of the ultrasonic generator during the bonding operation. A plurality of frequency readings are taken and measured during the formation of an ultrasonic wedge bond and this information is employed to calculate a bond quality rating which accurately predicts whether a good bond has been made or some condition exists indicating that a good bond has not been made.
REFERENCES:
patent: 3784079 (1974-01-01), Spanjer
patent: 3852999 (1974-10-01), Wright
patent: 4047657 (1977-09-01), Mims
patent: 4341574 (1982-07-01), Landes
patent: 4479386 (1984-10-01), Beggs et al.
McBrearty Michael
Negin Michael
Weilerstein I. Marvin
Zielenski Albert J.
Chapman, Jr. John E.
Kulicke and Soffa Industries Inc.
Levy Stewart J.
Sowell John B.
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