Structure optimization of ultrasonic bonding transducer based on frequency sensitivity method

To the common problems that double resonant peaks or multiple resonant peaks in ultrasonic transducer, a structure optimization method based on frequency sensitivity was introduced in this paper. For an ultrasonic transducer with double peaks used in wire bonding, the modal frequency sensitivity was investigated to control the double peak problems by modifying the minimal diameter of the horn, which can control effectively the distrub from the non-working modal vibration and the transducer canbe driven at the resonant frequency, further the stable outputs of the ultrasonic energy will be improved.