| 摘要 |
PURPOSE:To prevent the generation of resonance and buckling phenomena by providing a couple of composite elastic members which each have a tip between a lens frame and a magneic belt and each base held by a holding member, and locking their control positions for resonance and buckling by beltlike members consisting of damping materials. CONSTITUTION:When a tracking signal is supplied to coils 17 and 17', an objective lens 16 is displaced through the operation of leaf springs 19 and 20 at right angles to an optical axis, but the resonance occurs as a result. When a focusing signal is supplied to a coil 8, the objective lens 15 is displaced along the optical axis, but buckling phenomenon occurs to leaf springs 19 and 19', 20 and 20'. For this purpose, control positions of the leaf springs 19 and 19', and 20 and 20' for the resonance and buckling are locked by the beltlike members 23 and 23' consisting of the damping materials. Thus, the resonance and buckling are prevented without spoiling characteristics of the leaf springs at a focusing and a tracking position. |
