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Optical recording medium and its mfg. method

An optical recording medium and recording layer technology, which is applied in the manufacture of optical record carriers, optical record carriers, and record carrier materials, etc., can solve the problems of corrosion, high price, and no disclosure of technical ideas.

Inactive Publication Date: 2003-09-24
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] (1) Easy to corrode under high temperature and high humidity
[0013] (2) Easily corroded by sulfur or chlorine
[0014] (3) The adhesion between the reflective layer and the base layer is small
[0015] (4) Ag is a precious metal, and it is more expensive than Al, etc.
In addition, regarding the film thickness, it is thicker than the numerical limit range of the present invention, which is 2 to 9 nm. Therefore, the object of the present invention cannot be achieved, and it is clear that the technical idea of ​​the present invention has not been disclosed.
[0030] Furthermore, in the above-mentioned prior art, there is no disclosure at all about the preferred sputtering conditions for providing an intermediate layer containing Si or a dielectric protective layer to a recording medium, and the preferred layer structure and film quality influenced by the sputtering conditions. , and optimum film thickness resulting in a good balance of environmental reliability and recording signal characteristics

Method used

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  • Optical recording medium and its mfg. method
  • Optical recording medium and its mfg. method
  • Optical recording medium and its mfg. method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0261] A polycarbonate substrate with a thickness of 0.6 mm is formed by injection molding. The polycarbonate substrate is provided with a guide groove with a groove width of 0.25 μm, a groove depth of 27 nm, and a period of 4.26 μm of the swing groove. The substrate is sputtered on the substrate. A first protective layer, a recording layer, a second protective layer, a third protective layer, and an Ag reflective layer with a purity of 99.99% by weight were sequentially laminated.

[0262] The first protective layer and the second protective layer use ZnS·SiO 2 (80 / 20 mol%), the film thickness of the first protective layer was set to 80 nm, and the film thickness of the second protective layer was set to 14 nm.

[0263] The recording layer uses Ga 3 Ge 3 Mn 4 Sb 70 Te 20 , The film thickness is set to 16nm.

[0264] The third protective layer uses a Si film with a thickness of 4 nm. The electronegativity of Si is 1.8, and a material smaller than the electronegativity of Ag of 1.9...

Embodiment 2-13

[0277] A polycarbonate substrate with a thickness of 0.6 mm is formed by injection molding. The polycarbonate substrate is provided with a guide groove with a groove width of 0.25 μm, a groove depth of 27 nm, and a period of 4.26 μm of the swing groove. The substrate is sputtered on the substrate. A first protective layer, a recording layer, a second protective layer, a third protective layer, and an Ag reflective layer with a purity of 99.99% by weight were sequentially laminated.

[0278] The first protective layer and the second protective layer use ZnS·SiO 2 (80 / 20 mol%), Ga is used for the recording layer 3 Ge 3 Mn 4 Sb 70 Te 20 , The third protective layer uses the materials shown in Table 3-1 below. The film thickness and manufacturing conditions of each layer at this time are described in Table 3-1.

[0279] Next, an ultraviolet curable resin with a room temperature viscosity of 120 cps was coated on the Ag reflective layer by spin coating, and then cured. The glass transi...

Embodiment 14～18

[0304] Examples 14-18, Comparative Examples 8-10

[0305] A polycarbonate substrate with a thickness of 0.6 mm is formed by injection molding. The polycarbonate substrate is provided with a guide groove with a groove width of 0.25 μm and a groove depth of 27 nm. The sputtering method is sequentially laminated on the substrate to form the first protection Layer, recording layer, second protective layer, third protective layer, and Ag reflective layer with a purity of 99.99% by weight.

[0306] The first protective layer and the second protective layer use ZnS·SiO 2 (80 / 20 mol%), the thickness of the first protective layer was 80 nm, and the thickness of the second protective layer was 14 nm.

[0307] Recording layer uses Ge 2.0 Ag 0.5 In 5.0 Sb 68.5 Te 24.0 , The film thickness is set to 16nm.

[0308] The third protective layer used SiC as a target, and used the mixed gas shown in Table 4 below, and sputtered at a pressure of 0.5 Pa and a power of 1 kW to form a film with a thic...

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Abstract

The present invention relates to an optical recording medium capable of reproducing or recording information by irradiating laser light, particularly an optical recording medium capable of high-speed recording or high-speed reproduction, and a method for producing the same. The optical recording medium includes a substrate with guide grooves, a first protective layer on the substrate, a recording layer on the first protective layer, a second protective layer on the recording layer, and a first protective layer on the first protective layer. 2. A third protective layer with a film thickness of 2-9 nm and a Si content of not less than 35 mol% on the protective layer, and a reflective layer with an Ag content of not less than 95 wt%. Preferably, an overcoat layer having a glass transition temperature of 90°C to 180°C is formed on the reflective layer.

Description

Technical field [0001] The present invention relates to CD-DA, CD-ROM, VIDEO-CD, CD-R, CD-RW, DVD-VIDEO, DVD-ROM, DVD-R, DVD-RW, which can reproduce or record information by irradiating laser light. Optical recording media such as DVD+R, DVD+RW, DVD-RAM, and manufacturing methods thereof, and particularly to optical recording media capable of high-speed recording or high-speed reproduction, and manufacturing methods thereof, particularly capable of high-speed recording or High-speed reproduction optical recording medium and its manufacturing method. Background technique [0002] As optical recording media that can be reproduced or recorded by laser irradiation, CD-DA, CD-ROM, VIDEO-CD, CD-R, CD-RW, DVD-VIDEO, DVD-ROM, DVD-R, DVD-RW, DVD+R, DVD+RW, DVD-RAM, etc. have been commercialized. In order to record more information more quickly on these recording media, further densification and higher linear velocity are expected. Recently, the Ag-based reflection layer (Ag-based reflecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/2403G11B7/24067G11B7/24079G11B7/243G11B7/246G11B7/2463G11B7/2467G11B7/247G11B7/2472G11B7/249G11B7/253G11B7/2531G11B7/2533G11B7/2534G11B7/2536G11B7/257G11B7/258G11B7/2585G11B7/259
CPCG11B7/2403G11B7/24067G11B7/24079G11B7/246G11B7/2463G11B7/2467G11B7/2472G11B7/248G11B7/249G11B7/252G11B7/2531G11B7/2533G11B7/2534G11B7/2536G11B7/256G11B7/2585G11B7/259G11B7/266G11B2007/24306G11B2007/24308G11B2007/24312G11B2007/24314G11B2007/24316G11B2007/25706G11B2007/25708G11B2007/2571G11B2007/25711G11B2007/25713G11B2007/25715G11B2007/25716
Inventor 山田胜幸中村有希鸣海慎也加藤将纪
Owner RICOH KK
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