| 摘要 |
PURPOSE:To stabilize the operating amount of a piezoelectric actuator by preoperating a device prior to the normal operation of the device when the difference of the magnitudes of remaining strains before and after a voltage is applied is a predetermined value or more. CONSTITUTION:When a power source of a printer 10 is turned ON, a preapplication signal is supplied to a driver 14, and a voltage application/ removal of a piezoelectric element 12 is instructed to the driver 14. Application conditions such as the amplitude of the application voltage, its rising time, a connecting time, etc., are so selected as to displace the element 12 at the maximum, and that a remaining distortion after the voltage is removed becomes an intrinsic value responsive to various conditions such as temperature, etc. Accordingly, when the voltage application/removal of the element 12 is conducted, the error of the remaining distortion can be completely eliminated. Thereafter, an intrinsic application signal is supplied to the driver 14 on the basis of an operation signal supplied from an operation instructing unit. Thus, the operating amount of a piezoelectric actuator becomes substantially constant.
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