| 摘要 |
A system for controlling a piezoelectric element whose strain varies with a voltage applied thereto and which has a residual strain left after removal of the voltage, such that a difference in the amount of the residual strain before and after an energization of the piezoelectric element varies depending upon a hysteresis of the piezoelectric element before the energization. The system is adapted such that at least one preliminary energization of the piezoelectric element is effected, prior to a primary energization cycle of the piezoelectric element, at least where the difference is equal to or larger than a predetermined value. The primary energization cycle includes at least one primary energization of the piezoelectric element for attaining a desired function. The disclosed system is capable of eliminating an error of the actual amount of residual strain of the piezoelectric element from the nominal value, which may arise from different operating conditions of the element, such as energization time, time duration between successive energizations, and temperature variations of the element. <IMAGE>
|
