Missing wire detector

Details Missing wire detector Missing wire detector

1987-04-08

1988-11-22

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

73827, 228 45, 228 10, 228103, 324525, 324555, G01N 330

Patent

active

047868600

ABSTRACT:
The absence of a wire (40) in proper position under the bonding tool (32) of an ultrasonic wire bonder is detected by energizing the bonder transducer (14) while the wire is pulled to break it after the second bond (B) has been made. The pulling of the wire to break it changes the transducer impedance, which is monitored to signal presence or absence of a wire in its proper location.

REFERENCES:
patent: 2633019 (1953-03-01), Albrecht et al.
patent: 3818334 (1974-06-01), Rosenberg
patent: 4068371 (1978-01-01), Miller
patent: 4597522 (1986-07-01), Kobayashi
patent: 4600138 (1986-07-01), Hill
Unger et al., Self Test Ultrasonic Wire Bonding (Wire Bonding and Non--destructive Pull Testing by the Same Equipment), IEEE, May 1979, pp. 377-383.

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