Piezoelectric Vibrator for Ultrasonic Motor, Process for Producing the Same, Method of Mounting Piezoelectric Vibrator and Ultrasonic Motor

摘要

The piezoelectric vibrator for ultrasonic motors of the present invention is one capable of causing a piezoelectric vibrator component to generate a longitudinal vibration/bending vibration to thereby drive a moving element, said piezoelectric vibrator comprises a piezoelectric vibrator component and, bonded thereto through an elastic member, either a mounting member having means for bonding with a fixture or a fixture. This piezoelectric vibrator for ultrasonic motors is free from lowering the resonance characteristics of the piezoelectric vibrator component and enables operating the ultrasonic motor in high efficiency. Further, the assembly of the piezoelectric vibrator into the ultrasonic motor can be effected more easily and more securely than in the prior art and the stability and reliability thereof can markedly be improved at the time of motor operation. The ultrasonic motor of the present invention is an ultrasonic motor of the standing-wave type comprising a piezoelectric vibrator provided with a wear resisting member at its face opposite to a driving surface in the vicinity of an end thereof in the driving direction and bonded with a magnet for pressurizing the piezoelectric vibrator against the driving surface composed of a magnetic material by means of a bonding material, said magnet being disposed apart from the driving surface. This ultrasonic motor attains not only simplification of the pressurization mechanism and miniaturization of the motor and further ensures high driving efficiency.