Wire bonder with a device for determining the vectorial distance between the capillary and the image recognition system and method
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United States of America Patent
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Sep 19, 2006
Grant Date -
Oct 14, 2004
app pub date -
Apr 7, 2004
filing date -
Apr 14, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A Wire Bonder comprises a bondhead that can be moved in a horizontal plane that has a capillary clamped to a horn and parts of an image recognition system. The tip of the capillary and the optical axis of the image recognition system are separated by a vectorial distance D. The Wire Bonder has a device with a body with an optical marking and with two stop faces that enable the vectorial distance D to be recalibrated at any time. The control program of the Wire Bonder is set up on the one hand to move the capillary towards the first stop face and to determine a first co-ordinate x.sub.C of the position of the bondhead as soon as the capillary touches the first stop face and then to move the capillary towards the second stop face and to determine a second co-ordinate y.sub.C of the position of the bondhead as soon as the capillary touches the second stop face. The control program is further set up to determine the co-ordinates (x.sub.A, y.sub.A) of the bondhead at which the optical axis of the image recognition system passes through the optical marking at a predetermined point. And the control program is set up to recalibrate the vectorial distance D under consideration of the acquired co-ordinates x.sub.A, y.sub.A, x.sub.C and y.sub.C.
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