Television – Special applications – Manufacturing
Patent
1994-05-02
1997-06-17
Britton, Howard W.
Television
Special applications
Manufacturing
382146, H04N 718
Patent
active
056401990
ABSTRACT:
This invention provides a method and apparatus for automatically locating the bond of a wire to a lead frame and semiconductor chip or similar device as an in-process operation to facilitate in-process inspection. The apparatus includes a wire bonding machine, or similar apparatus, having a movable platform such as an X-Y table for holding semiconductor chips situated in lead frames; a video camera or other optical sensing or imaging device for generating images, which camera is typically positioned over the target chip and lead frame to be bonded; illumination means for illuminating the chip in a lead frame; an image processor capable of summing said absolute difference values, whereby each sum is stored as a difference metric, and digitizing and analyzing the optically sensed images; a bonding mechanism; and a host controller connected to the bonding mechanism, the movable platform, the camera and the image processor. The apparatus generates and stores a pre-bond digital image of the semiconductor chip in the lead frame before bonding has occurred; connects one or more wires between the chip and lead frame by any of a number of means such as ultrasonic bonding, heat bonding, conductive glue bonding or other means; generates and stores a post-bond digital image of the now-bonded chip in its lead frame; registers the pre-bond and post-bond stored digital images using nearest neighbor interpolation so that analysis can be done; and permits inspection of the results of the wire bonds according to appropriate criteria.
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Garakani Arman
Koljonen Juha
Michael David J.
Britton Howard W.
Cognex Corporation
Stretch Maureen
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