Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2000-02-22
2001-11-27
Sircus, Brian (Department: 2839)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S323040, C310S316010
Reexamination Certificate
active
06323579
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an ultrasonic driving motor in which a plurality of divided parts of a contact member are contacted with an ultrasonic vibrator by pressing with a ring-like elastic material, and a control apparatus is provided for driving the ultrasonic driving motor.
In an ultrasonic driving motor in the prior art, slide projections are made in the inside of a resilient ring frame of a rotor having a separated portion in the resilient ring frame, and the slide projections are pressed on a piezoelectric vibrator by opening the separated portion of the resilient ring frame. A rubber ring is inserted into a groove of the outside of the resilient ring frame, whereby the slide projections of the rotor are pressed on the piezoelectric vibrator.
In the ultrasonic driving motor, however, the rotor cannot be efficiently rotated by elliptically progressive waves generated on the edge of the piezoelectric vibrator, because the projections of the resilient ring frame of the rotor are contacted with the piezoelectric vibrator by leaving the spaces of the projections.
SUMMARY OF THE INVENTION
It is, therefore, the primary object of the present invention to provide an ultrasonic driving motor for efficiently transmitting a progressive wave to a contact member by pressing the whole edge of an ultrasonic vibrator with the contact member consisting of a plural divided parts by a ring-like elastic material.
It is another object of the present invention to provide an ultrasonic driving motor in which a rotor is rotated by rotating the contact member and the rotor is axially connected to the contact member.
It is another object of the present invention to provide an ultrasonic driving motor in which revolution of the rotor is detected by an encoder, the output of a voltage to frequency convertor is converted by the output of the encoder, and a small number of the output and a phase of a digital to analogue convertor are changed by the output of the encoder, whereby optimum frequency to the revolution number of the rotor is regulated.
In order to accomplish the above and other objects, the present invention comprises an ultrasonic vibrator having a center hole and an edge generating elliptically progressive waves, a contact member with plural divided parts contacted with each other, a ring-like elastic member for pressing the contact member to the edge of the ultrasonic vibrator, a fixing member fixed in the center hole of the ultrasonic vibrator, a rotor mounted to rotate by a bearing mounted to the fixing member, a connection member for connecting the contact member to the rotor.
REFERENCES:
patent: 4562374 (1985-12-01), Sashida
patent: 4608651 (1986-08-01), Murakami et al.
patent: 5493164 (1996-02-01), Nogarede
patent: 5886453 (1999-03-01), Kyodo
patent: 6031316 (2000-02-01), Kataoka
patent: 6201338 (2001-03-01), Naito et al.
Kurata Hisao
Maeda Yuji
Sato Keichi
Takahashi Shoji
Yagita Yasunobu
Goldberg Richard M.
Honda Electronics Co., Ltd.
Sircus Brian
Zarroli Michael C.
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