Appeal No. 1997-0367
Application No. 08/321,581
a vibrating member on which the at least one
piezoelectric vibrator is fixed, the vibrating member having a
plurality of projections;
a movable member having a plurality of non-uniform load
portions when viewed on a cross section in the direction of
its circumference; and
pressure regulating means for contacting the movable
member with the vibrating member under pressure;
wherein when the piezoelectric vibrator generates the
first standing wave, the projections are disposed at every
other one of the intermediate positions between a maximum
amplitude portion and a nodal portion of the first standing
wave, and each of the projections is located at a boundary
between two adjacent electrode patterns; and
wherein when the piezoelectric vibrator generates the
second standing wave, the projections are disposed at nodal
portions of the second standing wave and each of the
projections is located at a boundary between two adjacent
electrode patterns.
The Examiner relies on the following prior art:
Ueda et al. (Ueda) 5,237,237 Aug. 17,
1993
(Filed Mar. 11, 1991)
Miyazawa et al. (Miyazawa) 5,247,220 Sep. 21,
1993
(Filed Oct. 22, 1990)
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