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Optical information recording medium

A technology for recording media, optical information, applied in the direction of optical record carriers, optical recording heads, record carrier materials, etc.

Inactive Publication Date: 2007-10-17
VERBATIM CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0026]However, in the past, it was considered that high-speed recording and spot stability are contradictory characteristics, and it is difficult to meet the requirements of these two characteristics at the same time

Method used

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Examples

Experimental program
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Effect test

Embodiment 1 and comparative example 1

[0541] In order to compare the InGeSbTe system of the present invention as a recording layer with the conventionally known InAgSbTe quaternary system, as shown in Table-1, media with almost exactly the same recording layer composition and layer structure were prepared except for Ag and Ge compositions.

[0542] Except for the replacement of Ge and Ag, the other compositions of the two recording layers can be considered to be in the very same range within the measurement error range. The difference in film thickness of the lower protective layer is to adjust the reflectance Rtop of the medium to be the same. Such correction is necessary because the reflectance of the recording layer is slightly different, but it is necessary to make the correction to make the light absorption efficiency of the recording layer the same and to make the influence of the thermal damage caused by the reproducing light the same and to make the comparison. Since the film thickness of the recording...

Embodiment 2

[0564] Provide a lower protective layer (ZnS) with various film thicknesses on the substrate 80 (SiO 2 ) 20 , recording layer Ge 0.05 Sb 0.73 Te 0.22 , Upper protective layer (ZnS) 80 (SiO 2 ) 20 and reflective layer Al 0.995 Ta 0.005 . Table 3 shows the film thickness of each layer. All thin films are produced by sputtering without breaking the vacuum.

[0565] The reflective layer is formed in a vacuum up to 2×10 -4 Pa below, Ar pressure 0.54Pa, film forming speed 1.3nm / sec under the conditions.

[0566] Its volume resistivity is 55nΩ·m, and its area resistivity is 0.28Ω / □.

[0567] Impurities such as oxygen and nitrogen are considered to be below the detection sensitivity of X-ray excitation photoelectron spectroscopy, and are considered to be less than 1 atomic % in total. (ZnS) 80 (SiO 2 ) 20 The film density of the protective layer is 3.50g / cm 3 , is the theoretical bulk density of 3.72 g / cm 3 94% of. Also, the recording layer...

Embodiment 3

[0596] In addition to the composition of the recording layer using Ge 0.05 Sb 0.71 Te 0.24 In addition, the same layer structure as in Example 2 was used to make media, and the film layers and evaluation results of each layer are shown in Table-4. Measurements were performed using an optical system with NA=0.63.

[0597] Same as Table-3, take the best α for various layer structures 1 , αc and β n-1 , and also set the Pw and Pe that can make the jitter the lowest, and evaluate the jitter.

[0598] For Example 3 (a), as in Example 2 (a1), good characteristics can be obtained when the recording linear velocity is 1x speed and 2x speed, but at 9 m / s, the jitter is higher than that of Example 2 (a1) by 1 ~2%.

[0599] Also, for Examples 3 (a) to (f) in which the film thickness of the upper protective layer was 30 nm, the jitter was less than 10%, and it was less than 13% after 100 overwrites. For the thicker examples 3(g) to (i) in which the film thickness of th...

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Abstract

An optical information recording medium comprising a substrate and a phase-change recording layer including a crystal portion, which is brought into an unrecorded / erased state, and an amorphous portion, which is brought into a recorded state, for recording information by using recording marks whose shortest mark length is 0.5 mu m or less, is characterized in that erasure is effected by recrystalization substantially progressed by the growth of crystals from the boundary between the amorphous portion or a fusible portion and the peripheral crystal portion. The medium has a feature that high-speed overwrite is possible, the jitters at the mark edges are small, high-density variable mark-length recording is possible, and the stability of the marks with time is very good. An optical recording method suitable for such a medium is also disclosed.

Description

[0001] This application is a divisional application of the parent application whose title is "Optical Information Recording Medium and Optical Recording Method", the filing date is September 8, 1999, and the application number is 99801637.3 (PCT / JP 99 / 04874). technical field [0002] The present invention relates to rewritable DVD and other high-density recording optical recording mediums with phase-change recording layers and optical recording methods, in particular to the relationship between single beam rewriting and linear velocity, the relationship with recording power and the long-term stability of recording spots Optical recording with improved performance and an optical recording method. Background technique [0003] In general, compact discs (CDs) and DVDs record binary signals and detect tracking signals by utilizing changes in reflectance caused by interference of reflected light from pit bottoms and mirror portions. [0004] In recent years, phase-change rewritab...

Claims

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Application Information

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IPC IPC(8): G11B7/243G11B7/006G11B7/126
Inventor 水野裕宣大野孝志堀江通和
Owner VERBATIM CORPORATION
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