ELEKTROMECHANISCHER WANDLER

摘要

An electro-mechanical transducer 10 has a dielectric plate 11 which is coated on opposite major surfaces with electrodes 12a and 12b, and a base plate 13 which is bonded to one of the major surfaces of the dielectric plate 11 through the electrode 12b and does not follow the shrinkage and expansion of the dielectric plate 11 when a voltage is applied to the dielectric plate 11 through the electrodes 12a and 12b perpendicular thereto. The dielectric plate 11 is made of a ceramic which is in para-electric phase or anti-ferroelectric phase at room temperature to avoid residual strain and displacement due to domain structure. Two ceramic plates 11 may be bonded with a phosphor bronze base plate 13 therebetween to form a bi-morph. Such transducer can be used to support a magnetic head in a video tape recorder.