Importance

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Abstract

Disclosed are a method of and an apparatus for controlling piezoelectric vibration in an apparatus comprising a piezoelectric vibrating element, a vibrating unit such as a parts feeder to which the piezoelectric vibrating element is attached, and a driving unit for driving the piezoelectric vibrating element. The piezoelectric vibration control is performed by vibrating the piezoelectric vibrating element at a frequency at which the vibrating unit does not vibrate substantially; detecting a voltage, a current, and a phase difference between the voltage and the current while the piezoelectric vibrating element is driven at that frequency; driving the piezoelectric vibrating element at a frequency required for actually vibrating the vibrating unit; detecting a driving voltage and a driving current while the vibrating unit is vibrated; obtaining a current component not relating to the vibration of the vibrating unit from the detected voltages, currents, and the phase difference; computing a current component relating to the vibration of the vibrating unit from the current component not relating to the vibration; and controlling the current component relating to the vibration so as to be a constant value or a desired value.

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First Claim