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US 6,611,492 B2Granted
Optical recording medium and master disc for preparation thereof
AssigneeSony Corporation
InventorsToshihiro Akimori, Somei Endo, Manabu Sato
Life of this patent
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AssigneeSony Corporation
InventorsToshihiro Akimori, Somei Endo, Manabu Sato
Estimating the term…
An optical recording medium in which a high recording density is to be realized as compatibility with respect to a pre-existing optical recording medium is kept. A wobbling groove 5 is formed on a disc substrate 1. The modulation/demodulation system for the wobbling signals recorded on the wobbling groove 5 and that for information signals recorded and/or reproduced on or from the recording track are made to be the same as the modulation/demodulation system for a standardized pre-existing optical recording medium. Moreover, if the track pitch of kept recording track is Tp, the shortest recording mark period in recording on kept recording track is Mc, the wavelength of a light beam used in recording and/or reproducing kept recording track is λ, and the numerical aperture of the objective lens is NA, the following relation (1) to (3) X=Tp/(λ/NA) (1) Y=Mc/(λ/NA) (2) Y>2.9118X2−5.5422X+3.19 (3) are met.
An optical recording medium in which information signals are recorded and/or reproduced along a recording track, wherein the recording density is made to be higher than that in a standardized pre-existing optical recording medium despite the fact that the modulation/demodulation system for information signals recorded and/or reproduced on or from said recording track is made to be the same as that for said standardized pre-existing optical recording medium, and wherein
A master disc for preparation of an optical recording medium employed in the preparation of an optical recording medium in which information signals are recorded and/or reproduced along a recording track, wherein
Dependencies are inferred from the claim text.