Charging or discharging piezoelectric element whilst carrying out charge transport from element having capacitive characteristics to piezo-electric element or vice versa and several elements are provided having capacitive characteristics

摘要

The method of charging or discharging is carried out so that the element having capacitive characteristics under the use of this should charge or discharge the piezoelectric element, is chosen selectively from several elements (7b;7a,7b), dependent of the charge condition of the piezo electric element or of the aimed for course or the aimed for extent of the charge or the discharge.