Patent ID: 7973451

Claim:
An ultrasonic linear motor, comprising a plate-type ultrasonic oscillator with two planar parallel main faces, two end faces and two lateral faces, and a mobile element engaged with at least one guide rail and having two friction parts, said element frictionally interacting with the ultrasonic oscillator via the lateral faces of the friction parts, characterized in that the lateral faces of the ultrasonic oscillator are planar and are inclined at like angles in relation to a longitudinal plane of symmetry in such a way that the intersection lines between the planes of the lateral faces and the longitudinal plane of symmetry extend parallel to the main faces of the ultrasonic oscillator, and that the friction parts of the mobile element are resiliently connected to each other, wherein the friction parts of the mobile element press against the corresponding lateral faces of the ultrasonic oscillator with a first contact pressing force and the mobile element presses against the guide rail with a second contact pressing force, wherein the ratio between the first and second contact pressing forces is determined by the angle of inclination of the lateral faces in relation to the longitudinal plane of symmetry of the ultrasonic oscillator.