US6611492B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium and master disc for preparation thereof
Assignee: Sony Corp
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Filing: 2001-02-09
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Granted: 2003-08-26
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Expires: 2021-02-09
Abstract
Abstract 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 lambd, and the numerical aperture of the objective lens is NA, the following relation (1) to (3)are met.
Inventors
- 👤 Toshihiro Akimori
- 👤 Somei Endo
- 👤 Manabu Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:10
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24073; G11B7/24085; G11B7/007; G11B7/26; G11B7/261
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
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 if the track pitch of said recording track is Tp, the shortest recording mark period in recording on said recording track is Mc, the wavelength of a light beam used in recording and/or reproducing said 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> 2.9118 X 2 −5.5422 X+ 3.19 (3).
Claim 2
Dependent Claim
143 words
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 if the track pitch of said recording track is Tp, the shortest recording mark period in recording on said recording track is Mc, the wavelength of a light beam used in recording and/or reproducing said 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> 2.9118 X 2 −5.5422 X+ 3.19 (3).
Claim 3
Dependent Claim
34 words
The optical recording medium according to claim 1 wherein the relation (1) to (3) are met and, in addition, the relation shown by the following inequality (4): Y< 0.8899 X −1 (4) is met.
Claim 4
Dependent Claim
31 words
The optical recording medium according to claim 1 wherein the relation (1) to (3) are met and, in addition, the relation shown by the following inequality (5): X>0.5 (5) is met.
Claim 5
Dependent Claim
24 words
The optical recording medium according to claim 1 wherein a row of pits corresponding to EFM-modulated information signals is formed on said recording track.
Claim 6
Dependent Claim
64 words
The optical recording medium according to claim 1 wherein a wobbling groove is formed for extending along said recording track; information signals are recorded and/or reproduced for said recording track based on wobbling signals from said wobbling groove; and wherein the modulation/demodulation system for said wobbling groove is made to be the same as the modulation/demodulation system in said standardized pre-existing optical recording medium.
Claim 7
Dependent Claim
37 words
The optical recording medium according to claim 5 wherein signals recorded and/or reproduced for said recording track are EFM-modulated signals and wherein said wobbling signals are FM-modulated signals containing the absolute time information or the address information.
Claim 8
Dependent Claim
185 words
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 said master disc has formed thereon a crest-and-groove pattern corresponding to a recording track to be formed on said optical recording medium; the recording density of said optical recording medium 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 if the track pitch of said recording track is Tp, the shortest recording mark period in recording on said recording track is Mc, the wavelength of a light beam used in recording and/or reproducing said recording track is λ, and the numerical aperture of the objective lens is NA, the following relation (6) to (8) X=Tp /(λ/ NA ) (6) Y=Mc /(λ/ NA ) (7) Y> 2.9118 X 2 −5.5422 X+ 3.19 (8).
Claim 9
Dependent Claim
185 words
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 said master disc has formed thereon a crest-and-groove pattern corresponding to a recording track to be formed on said optical recording medium; the recording density of said optical recording medium 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 if the track pitch of said recording track is Tp, the shortest recording mark period in recording on said recording track is Mc, the wavelength of a light beam used in recording and/or reproducing said recording track is λ, and the numerical aperture of the objective lens is NA, the following relation (6) to (8) X=Tp /(λ/ NA ) (6) Y=Mc /(λ/ NA ) (7) Y> 2.9118 X 2 −5.5422 X+ 3.19 (8).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-08-25 | 2007-02-24 | 2007-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-08-25 | 2011-02-24 | 2011-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-08-25 | 2015-02-24 | 2015-08-26 | $7700.00 | Window Closed / Lapsed |