Patent ID: 8181527

Claim:
A method of pass/fail determination of bonding in a bonding apparatus, comprising: preparing a bonding apparatus comprising: a base unit; an ultrasonic horn configured to vibrate longitudinally in resonance with the vibration of an ultrasonic vibrator; a bonding tool attached at an anti-node of the vibration of the ultrasonic horn; a flange provided at a node of the vibration of the ultrasonic horn; a bonding arm comprising a flange mounting surface, the flange being fixed to the ultrasonic horn, and attached rotatably to the base unit in such a manner as to move a tip end of the bonding tool in a direction toward and away from a bonding target; and a load sensor attached between the center of rotation of the bonding arm and the flange mounting surface in an offset manner in the direction toward and away from the bonding target from a longitudinal central axis of the ultrasonic horn; continuously detecting a load on the bonding tool in the direction toward and away from the bonding target using the load sensor during bonding operation; defining the maximum value of the detected load as an impact load; and determining pass/fail of the bonding based on the impact load.