Abstract: A method of determining a trajectory of an arc motion of a wire used in the formation of a wire loop is provided. The arc motion is between a first point and a second point of the trajectory. The method includes: (1) defining a pivot point with respect to the first point and the second point; (2) determining a plurality of data points for generating the trajectory, each of the data points including a radius value and an angle value as a function of time, each of the angle values being between (a) a first angle defined by the pivot point and the first point, and (b) a second angle defined by the pivot point and the second point; and (3) converting the plurality of data points into trajectory data that may be used by a wire bonding machine.

Abstract: A method of determining a trajectory of an arc motion of a wire used in the formation of a wire loop is provided. The arc motion is between a first point and a second point of the trajectory. The method includes: (1) defining a pivot point with respect to the first point and the second point; (2) determining a plurality of data points for generating the trajectory, each of the data points including a radius value and an angle value as a function of time, each of the angle values being between (a) a first angle defined by the pivot point and the first point, and (b) a second angle defined by the pivot point and the second point; and (3) converting the plurality of data points into trajectory data that may be used by a wire bonding machine.

Abstract: A novel pull strength tester is incorporated into an automatic wire bonder for performing pull strength tests during production bonding operation. The pull strength tester is provided with a control for automatically applying increments of pull force on a fine wire after making a bond. The control senses the elongation of the fine wire as a result of the force applied and is capable of terminating the pull test at a predetermined threshold value or continuing to increase the force until a break occurs. After each increase in force, a continuity circuit determines if the wire has broken at the bond or the bond has lifted off the bonding target. The system employs the information to determine if a proper bond was made and/or if a short tail was made which could affect the subsequent attempt to form a proper ball for a subsequent first bond.