| 摘要 |
The invention provides a focus search apparatus and a focus search method by which damage to an objective lens of an optical pickup or an optical recording medium upon a focus search can be prevented at a low cost. The optical pickup is driven in a focusing direction with a gradually increasing amplitude, and the driving is stopped when the optical pickup reaches a range within which focus servoing is possible. Since the amplitude of the driving exhibits a gradual increase, even if the optical pickup is driven over several periods in an initial stage of the focus search, the amplitude of the driving then is still small. Since the optical pickup has a number of opportunities in which it can reach the range within which focus servoing is possible equal to the number of periods, the possibility that the optical pickup may collide with the optical recording medium is low.
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