Ultrasonic motor and conveying apparatus having the same

An ultrasonic motor comprising:

• a fixed member including a surface;
• and
• a movable member disposed to face the surface of the fixed member, the movable member comprising an actuator to cause at least a portion of the movable member to contact the surface of the fixed member and cause the movable member to move relative to the fixed member;
• wherein the actuator comprises an electric field-converting element layer disposed on the movable member, which shapes the movable member into a traveling wave shape if the electric field-converting element layer is supplied with an electric power,
• wherein the movable member comprises at least one vibrating element that is movable, the at least one vibrating element being deformable to generate the traveling wave shape,
• wherein the fixed member comprises at least one contact element fixedly disposed opposite to the at least one vibrating element to come in friction contact with the at least one vibrating element when the at least one vibrating element is deformed into the traveling wave shape, and
• wherein the at least one vibrating element comprises:
• a hollowed plate comprising the electric field-converting element layer attached thereon;
• and
• a projection part disposed on the hollowed plate, the projection part comprising a plurality of projections formed opposite to the contact element.

A conveying apparatus comprising:

• an ultrasonic motor comprising a fixed member including a surface, a movable member rotatably positioned to face the surface of the fixed member, and an actuator to cause at least a portion of the movable member to contact the surface of the fixed member and cause the movable member to move relative to the fixed member;
• and
• a motion converting unit connected with the ultrasonic motor, which converts a rotational motion of the movable member into a linear motion and transmits the linear motion to convey a device;
• wherein the actuator comprises an electric field-converting element layer disposed on the movable member, which shapes the movable member into a traveling wave shape if the electric field-converting element layer is supplied with an electric power,
• wherein the movable member comprises at least one vibrating element that is movable, the at least one vibrating element being deformable by the traveling wave shape, and
• wherein the fixed member comprises at least one contact element fixedly disposed opposite to the at least one vibrating element to come in friction contact with the at least one vibrating element if the at least one vibrating element is deformed by the traveling wave shape.

An ultrasonic motor comprising:

• a first stator;
• a second stator, the first and the second stators being substantially fixed;
• a vibrating rotor disposed between the first and the second stators, the vibrating rotor comprising:
• a plurality of projection members disposed at an outer edge of the vibrating rotor and opposingly disposed toward the first and the second stators;
• a piezoelectric layer disposed between the plurality of projection members and a center of the vibrating rotor;
• and
• an output shaft coupled to the vibrating rotor.