| 摘要 |
PURPOSE:To improve the following-up capacity in high-frequency driving to perform stably auto-tracking by placing the center of gravity of the moving part of an optical system of an object lens, an optical head, or the like in a middle position between the position, to which a driving force is applied, and a fulcrum or a position to the fulcrum of the middle position. CONSTITUTION:For example, with respect to two-dimensional driving of an object lens 1 of an optical disc device, upper and lower ends of a lens holder 2 are supported by flat springs 3 and 4 respectively, and the other ends of flat springs 3 and 4 are fixed to one ends of flat springs 5 and 6 through a repeating plate 7. Thus, the lens 1 is so supported that it can be moved two-dimensionally in directions of arrows 14 and 15 with the position of the repeating plate 7 as a fulcrum A. Coils 8 and 9 are stuck to side faces of the lens holder 2 and are placed in magnetic fields of a yoke 10, a permanent magnet 11, a yoke 12, and a permanent magnet 13. The center of gravity GP of this device is placed in the middle position between the position of the coil 8, to which the driving force of the moving system including the optical system, and the fulcrum A or a position to the fulcrum A of the middle position. Thus, the shake due to resonance with respect to a high-frequency signal is prevented to improve the following-up capacity.
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