| 摘要 |
In an optical disc apparatus 1, when a supply of operation power to the main unit is started, an objective lens 4a is moved to a focusing position (a position where the focus is placed on a reflective recording layer of an optical disc 10) which is determined in the design level. If the quantity of reflected light at this time is equal to or larger than a threshold SH, it is judged that the optical disc 10 is set in the main unit. Therefore, a time period required for detecting whether the optical disc 10 is set in the main unit or not can be shortened.
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