Abstract
The piezoelectric elemnet has high positioning resolution although it suffers from the problem of a rather small displacement range. The proposed actuator can achieve both a high positioning resolution and a long stroke. This mechanism is modified the construction of Impact Drive Mechanism(IDM), and is named Smooth Impact Drive Mechanism(SIDM) because of the smooth movement. To drive SIDM, the piezoelectric element is expanded slowly, and is contracted rapidly. The waveform of displacement of piezoelectric element is as saw-tooth. To generate saw-tooth displacement, saw-tooth voltage has been supplied. But the saw-tooth voltage is not always best, because transfer function from voltage to displacement in the piezoelectric element is not flat. It is necessary that the transfer function is considered to optimize waveform of voltage. By simulation it is found that the optimum waveform at 0.7 scale of resonance frequency is similar to rectangular pulse. And it is reported that SIDM can be driven by using the rectangular voltage.
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