Drive apparatus

Details Drive apparatus Drive apparatus

2007-03-09

2010-11-16

Benson, Walter (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07834515

ABSTRACT:
A drive apparatus includes an ultrasonic motor that rotates by an electromechanical transducer element, and generates an intermittent signal that outputs an alternating signal without change only during ON times of a pulse signal as a driving signal for the ultrasonic motor. A voltage is applied to the ultrasonic motor based on the driving signal to intermittently drive the ultrasonic motor, thereby reducing (adjusting) the speed of the ultrasonic motor. By setting the frequency of the intermittent signal (the inverse of a period of the intermittent signal) to a frequency outside the audible frequency range during the intermittent drive, noise can be easily lowered.

REFERENCES:
patent: 5917267 (1999-06-01), Miyazawa et al.
patent: 2001/0026112 (2001-10-01), Yoshida et al.
patent: 2005/0067921 (2005-03-01), Yamamoto
patent: 2006/0082253 (2006-04-01), Hara
patent: 63-7174 (1988-01-01), None
patent: 9-163765 (1997-06-01), None
Translation of JP 63-007174.

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