Tracking and focus servo system with defect detection

Details Tracking and focus servo system with defect detection Tracking and focus servo system with defect detection

2006-03-21

2006-03-21

Tran, Thang V. (Department: 2653)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S047140

Reexamination Certificate

active

07016280

ABSTRACT:
A defect detector in an optical disk drive is presented. The defect detector indicates a defect by monitoring a sum signal. The sum signal is calculated from optical signals from detectors in an optical pick-up unit of the optical disk drive. A defect can be indicated when a filtered sum signal, the filtered sum signal being the sum signal filtered with a high pass filter, is above a threshold value. In some embodiments, the defect detector can recognize changes in laser power or transitions between media types and not indicate defects during those occurrences.

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