PIEZOELECTRIC ELEMENTS AND DEVICES INCORPORATING SAME

摘要

A piezoelectric element comprises a helical coil (10) having the piezoelectric properties. The coil (10) may have the properties of a spring and may be formed of a coiled tube. Electrodes may be formed on the inner and outer walls of the tube or within the wall of the tube. The use of the piezoelectric element in an actuator and in an underwater acoustic or seismic sensor is disclosed.