Patent ID: 8106564

Claim:
An ultrasonic transducer, comprising an elongate horn, a counterpiece, two piezoelectric drives, and a screw, the counterpiece being fastened to the horn by means of the screw, the piezoelectric drives arranged on either side of a longitudinal axis of the transducer and clamped between the horn and the counterpiece, the horn having a flange comprising at least one hole for fastening the transducer to a bonding head of a wire bonder, wherein first ultrasonic oscillations, which are directed parallel to the longitudinal axis of the transducer, form in the transducer when first, in-phase alternating voltages are applied to the two piezoelectric drives, second ultrasonic oscillations, which are directed transversely to the longitudinal axis of the transducer, form in the transducer when second, inversely phased alternating voltages are applied to the two piezoelectric drives, and wherein the piezoelectric drives are located in a first node of the first ultrasonic oscillations, the piezoelectric drives are located in a first antinode of the second ultrasonic oscillations, the flange is located in a second node of the first ultrasonic oscillations, the flange is located in a second antinode of the second ultrasonic oscillations, and the at least one hole in the flange is located in a further node of the second ultrasonic oscillations.