HIGH DATA DENSITY OPTICAL MEDIA DISCS

A high data density pre-recorded optical media disc having a data density of at least 7.5 Gigabytes per disc layer or 0.17 Gigabytes per square cm (Gb/cm ) per layer and a degree or replication such that the average pit depth equals 1/4 to 1/8 times (the wavelength of the laser divided by the refrac...

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Bibliographic Details
Main Authors JONES, MARY, ANN, PARSONS, GARY, D, HAHNFELD, JERRY, L
Format Patent
LanguageEnglish
French
German
Published 25.10.2006
Subjects
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
CHEMISTRY
COMPOSITIONS BASED THEREON
GENERAL PROCESSES OF COMPOUNDING
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PHYSICS
THEIR PREPARATION OR CHEMICAL WORKING-UP
WORKING-UP
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Summary:A high data density pre-recorded optical media disc having a data density of at least 7.5 Gigabytes per disc layer or 0.17 Gigabytes per square cm (Gb/cm ) per layer and a degree or replication such that the average pit depth equals 1/4 to 1/8 times (the wavelength of the laser divided by the refractive index of the disc); or a rewritable optical media disc having a data density of at least 0.05 Gb/cm , wherein at least 75 percent replication is achieved as measured by a combination of groove height and the left and right sidewall angles, and wherein the pre-recorded or rewritable disc has a retardation of less than 25 nm per 0.6 mm substrate thickness, and a water absorbance of less than 0.5 percent as measured according to ASTM D570.
Bibliography:Application Number: EP20000952373