| 摘要 |
An apparatus for detecting whether bonding wire supplied to an ultrasonic bonding tool of an ultrasonic bonding machine is present in a bore of the tool tip and providing an alarm signal if a wire segment normally within the bore is absent because of inadvertent breakage or misfeeding of the wire includes an electronic switching and detection module connected between a machine ground terminal connected to a wire supply reel and a bonding tool electrically isolated from the machine ground. In response to an enable signal input to the module prior to making the first of a pair of ultrasonic bonds to interconnect a pair of binding sites by a bonding wire, electronic switching means within the module electrically isolate the machine ground from the tool, and electric continuity detection means within the module determines whether the tool has been brought to voltage level near that of the machine ground by electrical conductive contact between the wire segment within the tool bore, and the bore wall. Upon removal of the enable signal the electronic switching means reconnects the tool to machine ground preparatory to utilizing the tool to make an ultrasonic bond, or provide an alarm signal and/or halt operation of the machine upon not detecting continuity between the tool and wire supply ground.
|
