Optical disc device

Details Optical disc device Optical disc device

2011-06-28

2011-06-28

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S047140, C369S053150, C369S053170

Reexamination Certificate

active

07969844

ABSTRACT:
An optical disc apparatus includes: a defect detecting section124for detecting, based on a light detection signal and with respect to a preset detection reference level, a fingerprint or a bubble on the disc102as a defect to output a defect detection signal; and a waveform shaping section126to output a hold signal that holds, in response to the defect detection signal, a signal from a tracking control section109at a level just before the defect has occurred. The apparatus is initially operated not to hold the signal from the tracking control section109even if there is a defect. But once a tracking failure has occurred during a read operation, settings are changed to hold the signal from the tracking control section109against the defect while the read operation is retried.

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