| 摘要 |
Piezoelectric elements (1) are overlapping on a stator (11) in the same direction as shown in FIG. 3. Since a fixed end (6) of a piezoelectric element (1) is fixed to a foundation (4), an open end (7) of the piezoelectric element (1) elongates in the direction opposite to the foundation (4) when a voltage is applied to the piezoelectric element (1). When a drive device (12) generates a saw-tooth wave shown in FIG. 4(a), the piezoelectric element (1) rapidly elongates or slowly shrinks. A slider (21) then moves while being flicked away by the piezoelectric element (1). On the other hand, since piezoelectric element (1) rapidly shrinks or slowly elongates in the case of FIG. 4(b), a slider (21) moves while being pulled in by the piezoelectric element (1). Because of piezoelectric elements (1) arranged in a circle as shown in FIG. 13, a stator (11) can rotate a circular rotor (31) and a spherical rotor (35).
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