| 摘要 |
PURPOSE:To improve the efficiency of drive at maximum torque by forming an electrode divided into two to one surface of an electrostrictive element proper, interposing an insulating section and mounting an electrostrictive element to a common electrode on the other surface. CONSTITUTION:An electrostrictive element 14 has an annular-shaped electrostrictive element proper 9 polarizing in the thickness direction, electrodes 11, 12 divided into two centering around an insulating section 10 are formed onto one surface of the main body 9, and a common electrode 13 as a whole-surface electrode is shaped onto the other surface. Two electrostrictive elements 14 are used, a metallic material 19 with an output end section 18 is joined with the surface of the common electrode 13 for one element 14, and a metallic material 21 is joined with a common electrode plate 20 cemented with the surface of the common electrode 13 for the other element 14, and the metallic materials 19, 21 are fixed integrally by a bolt 22, thus constituting a composite vibrator 25. Accordingly, AC voltage having mutually different phase is applied, thus generating rectilinear vibrations, circular vibrations and elliptical vibrations in the arbitrary direction on a surface in the direction rectangular to the direction of division of the electrode in the output end section 18. |
