| 摘要 |
A drive circuit for driving a piezoelectric element print head actuator that has characteristic wherein its capacitance increases in association with increase in applied drive voltage. The drive circuit includes transistors for outputting a drive voltage of a waveform to the actuator (capacitor), and an element drive circuit for driving the transistors. One of the transistors is for charging the capacitor and the other transistor is for discharging the capacitor. Both of the transistors have a characteristic wherein their ON resistance decreases with increase in the applied drive voltage. The element drive circuit has a characteristic for driving the transistors while shortening the rising edge time and falling edge time of the drive waveform for driving the transistors in accordance with increase in the drive voltage amount. In this way, the transistors and the element drive circuit cancel out the characteristic of the actuator.
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