| 摘要 |
PURPOSE:To facilitate the easy assembling with small variation by fixing an objective lens holder to a bearing attached rotatably to a support shaft via two sheets of plate springs and then driving said lens holder toward an optical axis as well as in the tangential direction centering on the support shaft. CONSTITUTION:A bearing 21 which holds an objective lens holder 2 via parallel plate springs 3 and 4 of the same length is attached to a support shaft 20 fixed to a substrate. Thus an objective lens 1 can move in the focusing direction by means of the springs 3 and 4 and also can move round the shaft 20 in the tracking direction respectively. When an optical disk device reads the information on a disk, the current corresponding to the focus errror signal is supplied to coils 9 and 10. While the current corresponding to the tracking error signal flows to a coil 8. As a result, the holder 2 of the lens 1 is shifted to attain both auto- focusing and auto-tracking functions. |
