Back to results
US 7,680,010 B2Granted
Method for recording information on optical recording medium
AssigneeTDK Corporation
InventorsJiro Yoshinari, Hideaki Miura, Hiroshi Shingai
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeTDK Corporation
InventorsJiro Yoshinari, Hideaki Miura, Hiroshi Shingai
Estimating the term…
A method for recording information on an optical recording medium is provided so that it is satisfied that 0.16≦(Lv×Tcool)/(λ/NA)≦0.30 and 0.06≦(Lv×Ttop)/(λ/NA)≦0.14, where λ is a write wavelength of a laser beam used to irradiate the recording layer of a phase-change optical recording medium, NA is a numerical aperture of an objective lens used for irradiation with the laser beam, Lv is a relative speed between the objective lens and the optical recording medium, Tcool is a pulse time of a cooling pulse inserted immediately following a leading write pulse, and Ttop is a leading write pulse time. The method allows for forming a record mark with a good shape and prevents fluctuations at the front edge of the record mark, which would be otherwise caused by the recrystallization of the recording film being held at a high temperature.
A method for recording information on an optical recording medium, the method comprising pulse-modulating a laser beam into a pulse train including at least a leading write pulse at write power and a trailing cooling pulse at generally bottom power, and allowing the laser beam to irradiate a recording layer of a phase-change optical recording medium, thereby modulating the laser beam into a length of a record mark along a track of the recording layer, the length of the record mark being associated, for recording, with an integral multiple of T or nT, or a time length of write data, where T is a write channel clock cycle, a write wavelength of the laser beam is λ, a numerical aperture of an objective lens used for irradiation with the laser beam is NA, and a relative speed between the objective lens and the optical recording medium is Lv, wherein:
A method for recording information on a multi layered optical recording medium having a plurality of recording layers, the method comprising pulse-modulating a laser beam into a pulse train including at least a leading write pulse at write power and a trailing cooling pulse at generally bottom power, and allowing the laser beam to irradiate a recording layer of a phase-change optical recording medium, thereby modulating the laser beam into a length of a record mark along a track of the recording layer, the length of the record mark being associated, for recording, with an integral multiple of T or nT, or a time length of the write data, where T is a write channel clock cycle, a write wavelength of the laser beam is λ, a numerical aperture of an objective lens used for irradiation with the laser beam is NA, and a relative speed between the objective lens and the optical recording medium is Lv, wherein:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Drawings are temporarily unavailable. Open the PDF at USPTO
Overwriting: overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media
Information storage based on relative movement between record carrier and transducer
About 2 years 3 months of term left · ends 14 Jan 2029 (estimated)
1. Field of the Invention
The present invention relates to a method for recording information on a phase-change optical recording medium.
2. Description of the Related Art
FIG. 1 is a schematic cross-sectional view showing an optical recording medium on which information is recorded in accordance with a method of an example of the present invention;
FIG. 2 is a block diagram showing an information read and write apparatus for carrying out a method of the present invention;
FIG. 3 is a diagram showing a write strategy according to the embodiment;
Now, a more detailed description will be given below to an exemplary embodiment of the present invention with reference to FIGS. 1 and 2.
An optical recording medium 10 of this exemplary embodiment for recording information according to a method for recording information on an optical recording medium is configured such that a first recording layer (L0 layer) 14, an intermediate transparent layer 16, a second recording layer (hereinafter referred to as a recording layer) 18 (L1 layer), and a light transmitting layer 20 are laminated in that order on a substrate 12.
As illustrated under magnification in FIG. 1, the recording layer 18 is configured such that an underlying film 18A, a metal heat dissipation 18B, a second protective film 18C, a phase-change recording film (L1 recording film) 18D, and a first protective film 18E of a two-layered dielectric film and a heat dissipation film are laminated in that order on the intermediate transparent layer 16.