Device and program for checking optical disks

Details Device and program for checking optical disks Device and program for checking optical disks

2006-08-15

2006-08-15

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044320, C369S053150, C369S053170, C369S047140

Reexamination Certificate

active

07092333

ABSTRACT:
A plurality of tracks on an optical disk are optically read to obtain a signal containing a plurality of LOW segments. Each of the plurality of LOW segments should correspond to a certification pit. Accordingly, if the interval between LOW segment Xjand nth succeeding LOW segment Xj+nexceeds the length of one track, a defect pit that could be confused with a certification pit is judged as being present between two certification pits.

REFERENCES:
patent: 4873680 (1989-10-01), Chung et al.
patent: 5696757 (1997-12-01), Ozaki et al.
patent: 6031815 (2000-02-01), Heemskerk
patent: 6108296 (2000-08-01), Kajiyama et al.
patent: 6335912 (2002-01-01), Kobayashi et al.
patent: 6504800 (2003-01-01), Kuwahara et al.
patent: 6775227 (2004-08-01), Watanabe et al.
U.S. Appl. No. 09/832,960, filed Apr. 12,2001, entitled “Optical Disc, Reproduction Apparatus, and Disc Identifier Selecting Apparatus”, by Koichi Morioka et al.

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