| 摘要 |
PURPOSE:To facilitate machining, to eliminate bonding process and to suppress dispersion by applying first and second oblique electrodes on the outer circumferential face of a hollow cylinder while inclining by about 45 deg. with respect to the axis. CONSTITUTION:First and second oblique electrodes 22, 23, inclining by about 45 deg. with respect to the axis of a hollow cylinder 21, are applied on the outer circumferential face of the hollow piezoelectric ceramic cylinder 21 thus providing first two terminals. When the hollow cylinder 21 is subjected to polarization, it is polarized in the direction perpendicular to the direction of the first and second oblique electrodes 22, 23. Upon application of a voltage between the oblique electrodes 22, 23 under this state, contractive distortion is produced in the direction of polarization if the polarity of the voltage is same as that of the polarization voltage, whereas elongating distortion is produced in the perpendicular direction. Consequently, torsional displacement is produced in the hollow cylinder 21. By such method, machining is facilitated, bonding process is eliminated and dispersion can be suppressed. |
