Patent ID: 7004373
Filing Date: 2006-02-28
Classification: B23K,H01L

Abstract:
1. An apparatus for detecting failure of wire fed through a wire feed bore in an ultrasonic bonding tool of an ultrasonic bonding machine to properly bond to a bond site, said apparatus comprising; a. wire feed means including a despooler for feeding bonding wire to an inlet aperture of a wire feed bore through an ultrasonic bonding tool, said despooler comprising: b. monitoring means for monitoring the length of wire fed by said wire feed means to said bonding tool, c. distance determining means for determining a direction vector distance R between a pair of bond sites comprising a source bond site BS and a destination bond site BD on a workpiece, d. logic means for confirming that a length of wire C drawn from said wire feed supply spool means by said bonding tool in forming a wire interconnection bonded at a source end of said wire to said source bond site and at a destination end of said wire to said destination bond site is at least as large as a length L which is at least as large as said vector distance R between said bond sites, and e. said logic means outputting a first, pass signal if C is at least as large as L, and a fail signal if C is less than L.