| 摘要 |
PURPOSE:To avoid a shift of the optical axis of an objective lens despite the displacement of a mobile member by dividing vertically an objective lens supporter comprising a mobile member, an intermediate connection member and a pair of hinge parts into two parts centering on an optical axis. CONSTITUTION:The 1st objective lens supporter 20 contains a mobile member 21 fixing an objective lens 2 and a drive coil 30, an intermediate connection member 22, a support member 23 and a hinge member 24. The member 22 is connected to a hinge part 42 of the 2nd objective lens supporter 40. The member 21 is displaced in the direction X by the force F2 just by the flexion of the part 42 together with the drive of the coil 30, a magnet 60 and a yoke 70. Thus the rotary movement can be prevented round the axis Z. This eliminates a shift of the optical axis of the lens 2. In addition, the number of component parts is decreased since the component member of the supporter 20 is vertically divided into two parts. This simplifies the assembling and adjustment and improves the stable quality for an objective lens driver. |
