| 摘要 |
An optical disc apparatus continues the tracking operation even if a pickup reaches an unrecorded portion of a disc during the reproduction of an information signal. The apparatus discriminates whether the reading position of the pickup is at the recorded part or the unrecorded part according to a result of a comparison using a signal level read out, by the pickup, from a region other than a predetermined region. In accordance with the result of the discrimination, the tracking servo operation is switched to either one of a three-beam system and a push-pull system.
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