Research on a New Composite Ultrasonic Energy Transmission Mechanism with Parallel Structure

A composite two-dimension ultrasonic vibration system with parallel structure is presented in this paper for the wire bonding application. Compared with other conventional structures, this one uses the structure of the clamping beam, weakening the horizontal deflection stiffness, instead of the clamping ring, which weakens the coupling effects existing in most parallel structures. By means of the self-locking wedge, the piezoelectric ceramics are effectively preload. The length of the horn is optimized according to the relationship between the magnification ratio and the ratio of the horn length. Through the vibration characteristic analysis and FEA verification, it is proved that this parallel structure can increase the composite output amplitude of the ultrasonic horn and the density of ultrasonic energy, and can complete the bonding at a larger area range so that it will shorten the bonding time and improve the bonding efficiency.