US7197005B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording method and medium
Assignee: TDK Corp
•
Filing: 2001-10-09
•
Granted: 2007-03-27
•
Expires: 2021-10-09
Abstract
Abstract In an optical recording medium including a grooved light-transparent substrate, a phase change recording layer, a dielectric layer and a reflective layer, recording is carried out by irradiating a laser beam to the recording layer through an objective lens in an optical system. The recording is carried out in a groove recording mode under the conditions: 0.48≦P T /(λ/NA)≦0.74, and P T ≦0.50 μm wherein λ is a laser beam wavelength, NA is an objective lens numerical aperture, and P T is a track pitch, thereby forming a recorded mark having opposite ends extending out of the groove. This enables high density recording and increases the data transfer rate of a phase change optical recording medium.
Inventors
- 👤 Tatsuya Kato
- 👤 Hideki Hirata
- 👤 Hajime Utsunomiya
- 👤 Hiroyasu Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:46
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/24; G11B7/2407; G11B7/24073; G11B7/24079; G11B7/0045; G11B7/00454; G11B7/006; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B7/007; G11B7/00718; G11B7/252; G11B7/256; G11B7/257; G11B7/2578; G11B7/258
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
176 words
An optical recording method for recording information in an optical recording medium comprising a grooved light-transparent substrate including grooves and lands and a phase change recording layer thereon, by irradiating a laser beam thereto through an objective lens in an optical system, wherein the recording is carried out in a groove recording mode, in which only the grooves serve as a recording track, under the conditions: 0.48≦P T /(λ/NA)≦0.74 and P T ≦0.50 μm, provided that the laser beam used for recording has a wavelength λ, the objective lens has a numerical aperture NA, and recording tracks are arranged at a pitch P T , wherein the grooves are located relatively closer to a plane through which the laser beam enters than the lands, wherein said optical recording medium includes the recording layer, a dielectric layer, and a reflective layer stacked on the light-transparent substrate in the described order, and wherein the reflective layer has a thermal conductivity of at least 100 W/mK, and the dielectric layer has a thermal conductivity of at least 1 W/mK.
Claim 2
Dependent Claim
176 words
An optical recording method for recording information in an optical recording medium comprising a grooved light-transparent substrate including grooves and lands and a phase change recording layer thereon, by irradiating a laser beam thereto through an objective lens in an optical system, wherein the recording is carried out in a groove recording mode, in which only the grooves serve as a recording track, under the conditions: 0.48≦P T /(λ/NA)≦0.74 and P T ≦0.50 μm, provided that the laser beam used for recording has a wavelength λ, the objective lens has a numerical aperture NA, and recording tracks are arranged at a pitch P T , wherein the grooves are located relatively closer to a plane through which the laser beam enters than the lands, wherein said optical recording medium includes the recording layer, a dielectric layer, and a reflective layer stacked on the light-transparent substrate in the described order, and wherein the reflective layer has a thermal conductivity of at least 100 W/mK, and the dielectric layer has a thermal conductivity of at least 1 W/mK.
Claim 3
Dependent Claim
17 words
An optical recording medium in which recording is carried out by the method of claim 1 .
Claim 4
Dependent Claim
163 words
An optical recording method for recording information in an optical recording medium comprising a grooved light-transparent substrate and a phase change recording layer thereon, by irradiating a laser beam thereto through an objective lens in an optical system, wherein the recording is carried out in a groove recording mode, in which only grooves serve as a recording track, under the condition: 0.48≦P T /(λ/NA)≦0.68, provided that the laser beam used for recording has a wavelength λ, the objective lens has a numerical aperture NA, and recording track are arranged at a pitch P T , wherein the recording forms a recorded mark having at least one end extending out of the groove, and wherein said optical recording medium includes the recording layer, a dielectric layer, and a reflective layer stacked on the light-transparent substrate in the described order, the reflective layer has a thermal conductivity of at least 100 W/mK, and the dielectric layer has a thermal conductivity of at least 1 W/mK.
Claim 5
Dependent Claim
163 words
An optical recording method for recording information in an optical recording medium comprising a grooved light-transparent substrate and a phase change recording layer thereon, by irradiating a laser beam thereto through an objective lens in an optical system, wherein the recording is carried out in a groove recording mode, in which only grooves serve as a recording track, under the condition: 0.48≦P T /(λ/NA)≦0.68, provided that the laser beam used for recording has a wavelength λ, the objective lens has a numerical aperture NA, and recording track are arranged at a pitch P T , wherein the recording forms a recorded mark having at least one end extending out of the groove, and wherein said optical recording medium includes the recording layer, a dielectric layer, and a reflective layer stacked on the light-transparent substrate in the described order, the reflective layer has a thermal conductivity of at least 100 W/mK, and the dielectric layer has a thermal conductivity of at least 1 W/mK.
Claim 6
Dependent Claim
17 words
An optical recording medium in which recording is carried out by the method of claim 3 .
References Cited (Backward Citations)
US5916730A
Cited
US6167006A
Cited
US5694379A
Cited
EP0777216A2
Cited
EP0831468A2
Cited
EP0880131A2
Cited
US6040030A
Cited
EP0919996A2
Cited
EP0984443A1
Cited
US6385162B1
Cited
US6175548B1
Cited
JP2000011453A
Cited
US6125101A
Cited
EP0977189A1
Cited
US6636477B1
Cited
EP0994470A2
Cited
US6449239B1
Cited
EP1039451A2
Cited
US6611492B2
Cited
US6618349B2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2010-03-26 | 2010-09-25 | 2011-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2014-03-26 | 2014-09-25 | 2015-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2018-03-26 | 2018-09-25 | 2019-03-27 | $7700.00 | Window Closed / Lapsed |