Method for analyzing an abnormal region on an optical...

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

Reexamination Certificate

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Reexamination Certificate

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07821893

ABSTRACT:
The present invention relates to a method for analyzing abnormal regions on an optical recording medium. The method includes the steps of:detecting the abnormal region;determining the type of the abnormal region; andmeasuring the length of the abnormal region.Before playback or recording of an optical recording medium inserted in an apparatus for reading from and/or writing to optical recording media the apparatus determines the positions, lengths and types of abnormal regions on the optical recording medium. The obtained information can then be used, for example, to avoid that during playback or recording a pickup for reading and/or recording unexpectedly encounters an abnormal region. This makes the operation of the apparatus more reliable.

REFERENCES:
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patent: 5212677 (1993-05-01), Shimote et al.
patent: 5485444 (1996-01-01), Kuhn et al.
patent: 6263469 (2001-07-01), Jang
patent: 6336202 (2002-01-01), Tsuchimoto et al.
patent: 7038983 (2006-05-01), Ueda et al.
patent: 7215619 (2007-05-01), Van Den Enden
patent: 7457212 (2008-11-01), Oh
patent: 2003/0141997 (2003-07-01), Kawabe et al.
patent: 0397126 (1990-11-01), None
patent: 54048213 (1979-04-01), None
patent: 1-253638 (1989-10-01), None
English translation of Tsuchiya et al., Japan H01-253638, published Oct. 9, 1989, translated by Schreiber Translations, Inc.
Search Report dated Feb. 2, 2005.

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