Magnetic energy monitor for an ultrasonic wirebonder

Details Magnetic energy monitor for an ultrasonic wirebonder Magnetic energy monitor for an ultrasonic wirebonder

1996-06-13

1998-03-31

Bradley, P. Austin

Metal fusion bonding

Means to apply vibratory solid-state bonding energy to work

228 9, 228 565, B23K 2010

Patent

active

057328730

ABSTRACT:
An ultrasonic wirebonder has a horn and a transducer for vibrating the horn at a predetermined frequency. A magnet affixed to the horn generates a magnetic field. A coil coupled to the magnet has an output signal induced from the magnetic field moving relative to said coil. A filtering means filters the output signal from the coil to determine the reliably of the ultrasonic bond. An output device is used to monitor the output signal and determine whether the bond is reliable.

REFERENCES:
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patent: 4040885 (1977-08-01), Hight et al.
patent: 4341574 (1982-07-01), Landes
patent: 5357423 (1994-10-01), Weaver et al.
patent: 5360155 (1994-11-01), Ooki et al.
Kaman "Noncontact Position Measuring System", Ultrasonic System Analyzer UA-7251 Publication 860102-000. Rev. A. 1995.

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