Electrostrictive torsional vibrator

Claim 1

AN ELECTROSTRICTIVE VIBRATOR FOR USE AS A TRANSDUCER FOR A MECHANICAL FILTER OR THE LIKE, COMPRISING, IN COMBINATION: A SUBSTANTIALLY CYLINDRICAL, RADIALLY PRE-POLARIZED ELECTROSTRICTIVE BODY; COATINGS ON SAID BODY APPLIED TO THE CYLINDRICAL SURFACE AND THE WALL OF IN INTERNAL BORE AND WHICH COATINGS SERVE AT THE SAME TIME FOR APPLYING THE PRE-POLARIZATION VOLTAGE AND THE ALTERNATING DRIVING VOLTAGE AND THUS DEFINE ELECTRODES, THE GEOMETRIC FORM OF ONE ELECTRODE BEING ASYMMETRICAL IN SUCH A WAY THAT, IN A MIRROR IMAGE OF THIS BODY IN A PLANE DISPOSED AT RIGHT ANGLES TO THE AXIS OF TORSION, SUCH MIRROR IMAGE CANNOT BE MADE TO COINCIDE WITH THE ORIGINAL BODY BY CONTINUOUS ROTATION AROUND ANY AXIS WHATEVER AND BY PARALLEL DISPLACEMENT OF THE MIRROR IMAGE, THE COATINGS BEING DISPOSED COAXIAL WITH RESPECT TO ONE ANOTHER, AND THE END SURFACES OF THE CYLINDER EXTENDING OBLIQUELY TO THE AXIS OF SYMMETRY IN SUCH A WAY THAT THE TWO PLANES DEFINED BY SAID AXIS AND BY LINES AT RIGHT ANGLES TO THE END SURFACES TAKEN AT THE POINTS WHERE THEY INTERSECT ARE AT LEAST NEARLY AT RIGHT ANGLES TO ONE ANOTHER.