Optical information recording medium

An optical information recording medium having a disk-shaped substrate formed with spiral grooves on one main surface, and having an optical reflection layer formed with grooves at the surface corresponding to the grooves of the substrate for reflecting a laser beam, an optical recording layer, a pr...

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Bibliographic Details
Main Authors HAGIWARA, MOTOMITSU, HARA, FUMI, OTSU, TAKESHI, MIYATA, AKIMASA, MATSUDA, ISAO
Format Patent
LanguageEnglish
French
German
Published 31.12.2008
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:An optical information recording medium having a disk-shaped substrate formed with spiral grooves on one main surface, and having an optical reflection layer formed with grooves at the surface corresponding to the grooves of the substrate for reflecting a laser beam, an optical recording layer, a protective layer, and an optical transparency layer in this order on the main surface thereof. The optical information recording medium has a main information area and a sub-information area to the inner circumferential side thereof, in which the track pitch TrB for the grooves in the sub-information area is 0.32 µm or less, and the depth D for the grooves and the half-band width W for the grooves satisfy a relation represented by: W ‰¥ 2D + 70, whereby the difference between the reflectivity at the land surface and the reflectivity at the groove surface in the sub-information area can be restricted to less than 30% thereby preventing occurrence of mis-decipherment for BCA marks.
Bibliography:Application Number: EP20080250448