Patent ID: 7424966

Claim:
A method of ultrasonic mounting that ultrasonically bonds a semiconductor chip to a substrate using an ultrasonic mounting apparatus in which a horn that propagates ultrasonic vibration of a metallic ultrasonic vibrator is made of a ceramic that has a higher vibration propagation speed than the metal of the ultrasonic vibrator and in which a spacer, which is composed of a material that has a vibration propagation speed of an intermediate magnitude that is between a vibration propagation speed of the metallic ultrasonic vibrator and a vibration propagation speed of the ceramic horn, is interposed at a joint between the ultrasonic vibrator and the horn, the method comprising steps of: disposing the substrate on a stage; disposing the semiconductor chip on the substrate; and placing the semiconductor chip in contact with a convex part provided on the horn and applying ultrasonic vibration from the ultrasonic vibrator to the horn via the spacer so as to bond the semiconductor chip to the substrate.