Optical disk identifying device, optical disk identifying...

Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval

Reexamination Certificate

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Details

C369S053310

Reexamination Certificate

active

06965550

ABSTRACT:
A tracking error signal calculating unit (221) detects a tracking error signal of light with respect to a mark recorded on a wobbled groove in a focused-on state from the light reflected back from the wobbled groove. A pull-in signal calculating unit (225) detects a total light volume signal PI of the mark, recorded on the wobbled groove, from the reflected light. A D-flipflop discriminating circuit (244) compares the phase of a binary coded version of a tracking error signal TE detected by the tracking error signal calculating unit to the phase of a binary coded version of the total light volume signal PI as detected by the pull-in signal calculating unit to discriminate the sorts of the optical discs having the same outer shape and the same optical system but differing in the UTOC recording system.

REFERENCES:
patent: 6201784 (2001-03-01), Maeda
patent: 8-235763 (1996-09-01), None
patent: 9-198779 (1997-07-01), None
patent: 11-176070 (1999-07-01), None
patent: 2000-322742 (2000-11-01), None
patent: 2001-210004 (2001-08-01), None
patent: 2002-230753 (2002-08-01), None

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