ULTRASONIC MOTOR

PROBLEM TO BE SOLVED: To freely set a drive thrust to be generated while optimally maintaining traveling characteristics when slightly moving by forming a piezoelectric body with a plurality of systems, constituting each system with a plurality of piezoelectric element groups, and at the same time using at least the same number of sliding members as the number of piezoelectric element groups for constituting each system. SOLUTION: Sliding members 31 and 32 are provided on the bottom surface of an elastic body 1, two lamination-type piezoelectric bodies 21 and 22 for constituting a first system and two lamination-type piezoelectric bodies 23 and 24 for constituting a second system are provided in parallel on the bottom surface of the elastic body 1, and a pin 4 is planted and fixed at the center of the side surface of the elastic body 1, thus supporting the pin 4 so that it can freely rotate for the support body. Then, two burst waves whose phases are shifted by 90 degrees are applied to the first and second systems and two vibrations of vertical and flex vibrations are generated at the elastic body 1 for performing the elliptical motion of the two sliding members 31 and 32 and linearly moving a body to be driven, thus selecting the optimum characteristic of fine amount of travel and an arbitrary drive thrust.