PIEZOELECTRIC DRIVE Russian patent published in 2004 - IPC

FIELD: multilayer piezoelectric drives. SUBSTANCE: piezoelectric drive has plurality of piezoelectric wafers whose direction of polarization is oriented perpendicular to plane of their arrangement, these wafers being disposed one on top of other in direction of polarization to form stack; control voltage source with two contact leads; two groups of at least two external electrodes in each, and plurality of internal electrodes, each being disposed between piezoelectric wafers. External electrodes of first group are electrically connected to first contact lead of voltage source and those of second group are connected to second contact lead of voltage source. Internal electrodes alternately come in contact with external ones so that one internal electrode is electrically connected to first contact lead of voltage source and next one on stack height is electrically connected to second contact lead of voltage source. Internal electrodes come in contact with external electrodes in sequence cyclically repetitive through stack height. EFFECT: reduced cracking probability; improved ability of shorting out cracks, if the appear. 6 cl, 4 dwg