| 摘要 |
PURPOSE:To prevent the deviation in tracking owing to focusing by using at least a thin plate spring having arms of such a blanked shape as to have line symmetry with respect to >=2 straight lines running the central part of an elastic support which supports a lens barrel in constituting said elastic support. CONSTITUTION:An elastic support 5a has plural arms 11 which are formed and disposed respectively to have the shape of line symmetry with respect to >=2 straight lines running the central axis, for example, I - I and II-II lines, and are curved to an S shape or the like, and an inside ring 12 and outside ring 13 which are monolithically formed and support both ends of said arms. The ring 12 to be fixed to a lens barrel 3 and the ring 13 to be fixed to a cylindrical housing 8 are formed concentrically. Then, even if the barrel 3 moves from a neutral position by the focusing control by a driving coil 7, the forces in the rotating direction acted by the respective arms 11 on the barrel 3 are offset by each other and therefore the barrel 3 moves in a focusing direction 6 without rotating and the movement of an objective lens 1 in the direction 6 does not affect the tracking operation. |
