| 摘要 |
[Problems] In an objective lens driving device used for an optical disc and the like, a moving speed of the objective lens is changed corresponding to amount of vertical deviation of the optical disc, and when the vertical deviation is small, time for aligning the focus is reduced. [Means for Solving Problems] In a case that an objective lens is moved from a bottom limit to an upper limit in a specific range for aligning the focus, when the objective lens is positioned nearer a point (basic focusing position) where light is focused on an optical disc 11 having no vertical deviation than a position away from the basic focusing position, the servo signal processor 5 moves the objective lens faster.
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