| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a large displacement output of a magnetostrictive actuator whose displacement output loss is made small. <P>SOLUTION: The magnetostrictive actuator uses constitutively a magnetostrictive element 11 having a magnetostriction, a driving rod 13 connected with the magnetostrictive element 11 and capable of moving in the displacement direction of the magnetostrictive element 11 and made of a ferromagnetic, a solenoid coil 12 provided in the periphery of the magnetostrictive element 11 and for applying a magnetic field to the magnetostrictive element 11, and a storing portion 14 for storing therein the magnetostrictive element 11 and the solenoid coil 12. The storing portion 14 is so constituted by providing in the periphery of the magnetostrictive element 11 stored in it a permanent magnet 142 for applying a static bias magnetic field to the magnetostrictive element 11 and a cylindrical case 143 made of the ferromagnetic as to provide a clearance 15 between the driving rod 13 and the storing portion 14. A preload is applied to the magnetostrictive element 11 by the magnetic attracting force generated between the driving rod 13 and the storing portion 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
