Patent ID: 8540135

Claim:
A bonding apparatus for performing bonding operation to a pad disposed on a free end of an overhanging die, the bonding apparatus comprising: a capillary having a wire inserted therethrough; an ultrasonic vibrator configured to apply an ultrasonic wave to a bonding target through the capillary; an ultrasonic horn for holding the capillary at one end and having the ultrasonic vibrator at the other end, and configured to transmit the ultrasonic wave to the capillary; a load detector configured to detect a load acting on the capillary; a control unit configured to control the bonding apparatus as a whole; wherein the control unit comprises a computer program, the computer program controlling a bonding control process and a load change detecting process, the bonding control process that moves the capillary to a predetermined bonding position to bond the wire to the pad and that forms a wire loop by moving the capillary along a predetermined trajectory, the load change detecting process that stores a position of the capillary and the load acting on the capillary that has been detected by the load detector in association with each other to a memory in the control unit when moving the capillary, and wherein the bonding control process that forms the wire loop by obtaining a load change point that is a point at which the load acting on the capillary changes, based on the position of the capillary and the load acting on the capillary that have been stored by the load change detecting process that calculates a movement distance of the capillary by calculating a difference between a position of the capillary at the load change point and the bonding position and that retracts the capillary by the calculated movement distance, and that moves the capillary along the predetermined trajectory.