Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2010-10-14
2011-11-22
Budd, Mark (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S323030, C310S323040
Reexamination Certificate
active
08063538
ABSTRACT:
An ultrasonic motor includes a stator and a rotor. In the stator, an n number of piezoelectric elements (wherein n is a natural number) are affixed to one surface of a vibrating member, whose outer circumferential edge is circular or polygonal, along a direction in which the outer circumferential edge extends. Each of the piezoelectric elements has a size corresponding to λθ/2 in terms of center angle, and the piezoelectric elements that are adjacent to each other are disposed so as to be separated by an interval corresponding to λθ/4 in terms of the center angle along a circumferential direction of the vibrating member. The piezoelectric elements are polarized in opposite directions in a thickness direction. The rotor is disposed so as to contact the stator, and is rotated by receiving vibration resulting from a 3n-wave traveling wave generated by the stator.
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Budd Mark
Dickstein & Shapiro LLP
Murata Manufacturing Co. Ltd.
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