Optical disk reproducing device and optical disk reproducing...

Details Optical disk reproducing device and optical disk reproducing... Optical disk reproducing device and optical disk reproducing...

2007-06-12

2007-06-12

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053240, C369S044270

Reexamination Certificate

active

10659751

ABSTRACT:
A bottom hold circuit generates a bottom hold signal (BH signal) from an RFDC signal from an RF amplifier, and sends it to a comparator. The comparator compares a reference level and the BH signal, and generates an Rfdet signal having H level if the BH signal was found to be lower than the reference level. The Rfdet signal is a signal having H level when a laser spot falls in a data-recorded area on an optical disk, and having L level when in a non-recorded area. When it was detected that Rfdet signal had H level throughout a single turn of the disk, a servo-processing microcomputer controls an optical pickup so as to apply tracking servo. This makes it possible to precisely detect a boundary position between the data-recorded area and non-recorded area. If the optical disk is decentered, the boundary area corresponded to the amount of decentering can successfully be isolated from the data-recorded area.

REFERENCES:
patent: 2002/0159343 (2002-10-01), Fujimoto
patent: 2005/0099900 (2005-05-01), Buchler
patent: 10-172147 (1998-06-01), None
patent: 2001-250245 (2001-09-01), None
patent: 2003-030865 (2003-01-01), None
patent: WO 0165550 (2001-09-01), None

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