Patent ID: 8483024
Filing Date: 2013-07-09
Classification: G11B

Abstract:
1. A disc discrimination apparatus comprising: a detecting section configured to detect at least one of a ratio between a tracking error and a focus error, and a duty cycle of an off-track signal with respect to an optical disc; a deciding section configured to decide whether or not the optical disc is playable on the basis of said at least one of the ratio and the duty cycle detected by the detecting section; a focus servo; a tracking servo; means configured to adjust a tracking servo gain while holding the focus servo in its on state and holding the tracking servo in its off state; and wherein the tracking error used for the ratio and the duty cycle are those occurring while the tracking servo gain is adjusted by said means, and the deciding section decides whether or not the optical disc is playable after said adjusting the tracking servo gain has been completed; a tracking-error-balance adjusting section configured to decide whether or not said adjusting the tracking servo gain has been completed in a given term, to suspend said adjusting the tracking servo gain in cases where said adjusting the tracking servo gain has not been completed in the given term, to change a tracking error balance when said adjusting the tracking servo gain is suspended, and to restart said adjusting the tracking servo gain after the tracking error balance is changed.