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A microgripper capable of accurately releasing or clamping the microgold wire for ultrasonic bonding is a key component in integrated circuit and light-emitting diode wire bonders. A novel gripper with a piezoelectric (PZT) stack and flexible mechanism is presented. A dynamic model of the PZT gripper is established, and a method of suppression control for residual vibration is proposed. The vibration...
A design method for ultrasonic torsional transducer is presented based on the one-dimensional wave equation and the equivalent circuit method. Firstly, the equivalent circuits of torsional transducer and horn are constructed. The mounting flange can be placed right at the nodal plane, where no angular displacement occurs. An ultrasonic torsional tool is fabricated according to the presented method,...
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