Optical disc, having a certification pit for certifying that...

Details Optical disc, having a certification pit for certifying that... Optical disc, having a certification pit for certifying that...

2005-05-31

2005-05-31

Huber, Paul W. (Department: 2653)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S059250, C369S124070

Reexamination Certificate

active

06901042

ABSTRACT:
An optical disc includes a processed area that has been processed by the irradiation of a YAG laser. Concave pits and convex pits having a length 3T-14T (T=0.133 μm) are formed in an area of the optical disc other than the processed area. The processed area includes (1) a concave pit having a length X or (2) a pit string that has a length X and includes a convex pit from which a reflection layer has been removed. A specific area of the optical disc records physical character information that shows the location and length of the concave pit or the pit string in the processed area.

REFERENCES:
patent: 5696757 (1997-12-01), Ozaki et al.
patent: 5805551 (1998-09-01), Oshima et al.
patent: 5881038 (1999-03-01), Oshima et al.

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