| 摘要 |
PURPOSE:To enhance durability by preventing the seizure or abrasion at a bent part, by forming non-contact pats for avoiding the mutual contact of the bending parts of both leaf springs to the opposed surfaces of said bending parts. CONSTITUTION:When voltage is applied between both electrodes of a piezoelectric element 1, the piezoelectric element 1 is stretched by a predetermined length in its laminated direction, that is, the direction shown by an arrow X and a movable element 5 is displaced. Hereupon, the leaf spring 7 on the side of the movable element 5 receives the displacement force of the movable element 5 to be pushed up along the leaf spring 6 on the side of a frame 2 and both leaf springs 6, 7 are largely bent at the bending parts 6a, 7a thereof to generate angular moment in the direction shown by an arrow P and a tiltable member 8 is tilted. At this time, non-contact parts 6b, 7b are formed to the opposed surfaces of the bending parts 6a, 7a at a slight interval and the friction force generated between the opposed surfaces of both bending parts 6a, 7a is reduced as much as possible and magnification can be increased while the seizure or abrasion generated between the opposed surfaces of both bending parts 6a, 7a is prevented to keep magnification over a long period of time. |
