Piezoelectric driving body for ultrasonic motors

摘要

An ultrasonic motor of the present invention uses a vibrating body (1) in a quadrilateral form, with a piezoelectric element (2) provided on at least a part of the vibrating body (1), protrusions (1a) provided on the vibrating body, and a moving body (8). The piezoelectric element (2) is oscillated with a vibration wave having a node on a diagonal line (10a,10b) of the vibrating body (1). <??>Also, a plurality of electrodes (3b,3c,3d,3e) are provided on the piezoelectric element (2) formed on the vibrating body (1) so that a node of vibration oscillated on the vibrating body is moved in position to vary a rotation direction of the moving body. <IMAGE>