Ultrasonic linear motor

An ultrasonic linear motor comprising:

• first and second guides for providing pressing force;
• and
• an ultrasonic transducer including
• piezoelectric units provided at least at two portions,
• a plurality of first contact portions having portions for receiving the pressing force from the first guide, and
• at least one second contact portion having portions for receiving the pressing force from the second guide;
• wherein voltages which change over time are applied to the piezoelectric units so as to excite the ultrasonic transducer such that elliptic vibrations are generated at least at one contact portion of the first and second contact portions, so that the ultrasonic transducer is relatively moved as to the first or second guide.

An ultrasonic linear motor comprising:

• first and second guides;
• an ultrasonic transducer including
• a first and second piezoelectric layered units wherein piezoelectric layers and internal electrode layers are alternately layered in the same direction,
• a plurality of driving elements provided at portions pressed into contact against the first and second guides, and
• an output obtaining member;
• and
• pressing means for pressing the first and second guides into contact against the ultrasonic transducer under a predetermined pressure from both sides thereof;
• wherein alternating voltages are applied to the first and second piezoelectric layered units so as to excite the ultrasonic transducer so that longitudinal vibration and flexural vibration are generated at the same time, and thus elliptic vibrations are generated at the driving elements, whereby the ultrasonic transducer is moved as to the guides.

An ultrasonic linear motor comprising:

• first and second guides;
• an ultrasonic transducer including
• piezoelectric units provided at least at two portions,
• a plurality of driving elements provided at portions pressed into contact against the first and second guides, and
• an output obtaining member;
• and
• pressing means for pressing the first and second guides into contact against the ultrasonic transducer under a predetermined pressure;
• wherein alternating voltages are applied to the piezoelectric units so as to excite the ultrasonic transducer so that longitudinal vibration and flexural vibration are generated at the same time, and thus elliptic vibrations are generated at the driving elements, whereby the ultrasonic transducer is moved as to the guides.

An ultrasonic linear motor comprising:

• first and second guides having output obtaining members;
• an ultrasonic transducer including
• piezoelectric units provided at least at two portions,
• a plurality of driving elements provided at portions pressed into contact against the first and second guides, and
• a fixing member;
• wherein alternating voltages are applied to the piezoelectric units so as to excite the ultrasonic transducer so that longitudinal vibration and flexural vibration are generated at the same time, and thus elliptic vibrations are generated at the driving elements, whereby the first and second guides are moved as to the ultrasonic transducer.