Patent ID: 7108167

Claim:
A wire bonder, comprising an image recognition system, a bondhead movable in a horizontal plane and comprising a horn and a capillary clamped to the horn and at least one component of the image recognition system, a measuring system for acquiring a position of the bondhead, a control program for control of the position of the bondhead, and a device for determining and updating a vectorial distance between a tip of the capillary and an optical axis of the image recognition system, the device comprising a body with an optical marking and with two stop faces, the first stop face being aligned parallel to a first axis defining the horizontal plane and the second stop face being aligned parallel to a second axis defining the horizontal plane, wherein the control program is set up to move the capillary towards the first stop face and to determine a first co-ordinate of the position of the bondhead as soon as the capillary touches the first stop face and to move the capillary towards the second stop face and to determine a second co-ordinate of the position of the bondhead as soon as the capillary touches the second stop face and wherein the control program is set up to determine the co-ordinates of the bondhead at which the optical axis of the image recognition system passes through a predetermined point of the optical marking.