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Optical recording medium

An optical recording medium and recording layer technology, which can be applied to optical recording carriers, optical recording systems, recording/reproducing by optical methods, etc., and can solve the problem of high manufacturing cost of optical recording media

Inactive Publication Date: 2008-08-20
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] A problem arises when only carbides are used for the dielectric layer between the reflective layer and the recording layer: the optical constant k increases from single digits to four digits compared to oxides
In that case, the number of layers increases more and more, causing a problem of high manufacturing cost of the optical recording medium

Method used

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  • Optical recording medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 5

[0069] -Preparation of Optical Recording Medium-

[0070] A substrate made of polycarbonate resin having a diameter of 12 cm and a thickness of 1.1 mm on which grooves were formed was used. The pitch between the grooves was 0.32 μm, the width of the pitch where information was recorded was 0.165 μm, and the depth of the grooves was 22 nm.

[0071] Films were sequentially formed on the substrate using a magnetron sputtering apparatus DVD-Sprinter manufactured by Unaxis.

[0072] First, a 140 nm-thick reflective layer was formed using an Ag-Bi target (Bi content: 0.5 atomic %).

[0073] Next, use Nb 2 o 5 : SiO 2 =85:15 (mol %) targets to form the second dielectric layer with 5 different thicknesses shown in Table 1 on the reflective layer.

[0074] Then use the composition with Ge 9.5 Sb 66 sn 18 mn 6.5 (atomic %) target, a recording layer with a thickness of 14 nm was formed on the second dielectric layer with 5 different thicknesses.

[0075] Next, using ZnS:SiO 2 ...

Embodiment 6

[0088] -Preparation of Optical Recording Medium-

[0089] A substrate made of polycarbonate resin having a diameter of 12 cm and a thickness of 1.1 mm on which grooves were formed was used. The pitch between the grooves was 0.32 μm, the width of the pitch where information was recorded was 0.165 μm, and the depth of the grooves was 22 nm.

[0090] Films were sequentially formed on the substrate using a magnetron sputtering apparatus DVD-Sprinter manufactured by Unaxis.

[0091] First, a 140 nm-thick reflective layer was formed using an Ag-Bi target (Bi content: 0.5 atomic %).

[0092] Next, use Nb 2 o 5 : SiO 2 =85:15 (mol%) target, a second dielectric layer with a thickness of 8 nm was formed on the reflective layer.

[0093] Then use the composition with Ge 5.5 Sb 66 sn 18 mn 6.5 Ga 4 (atomic %) target, a recording layer with a thickness of 14 nm was formed on the second dielectric layer.

[0094] Next, using ZnS:SiO 2 =70:30 (mol%) target, the first dielectric l...

Embodiment 7 to 28

[0103] A substrate made of polycarbonate resin having a diameter of 12 cm and a thickness of 1.1 mm on which grooves were formed was used. The pitch between the grooves was 0.32 μm, the width of the pitch where information was recorded was 0.165 μm, and the depth of the grooves was 22 nm.

[0104] Films were sequentially formed on the substrate using a magnetron sputtering device DVD-Sprinter from Unaxis.

[0105] First, a 140 nm-thick reflective layer was formed using an Ag-Bi target (Bi content: 0.5 atomic %).

[0106] Next, use Nb respectively 2 o 5 ·SiO2 2 、 Ta 2 o 5 ·SiO2 2 and Nb 2 o 5 ·SiO2 2 ·Ta 2 o 5 target, a second dielectric layer with a thickness of 8 nm was formed on the reflective layer.

[0107] Use composition as Ge 5.5 Sb 66 sn 18 mn 6.5 Ga 4 (atomic %) target, a recording layer with a thickness of 14 nm was formed on the second dielectric layer.

[0108] Next, using ZnS:SiO 2 =70:30 (mol%) target, the first dielectric layer was formed on t...

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Abstract

It is an object of the present invention to provide an optical recording medium containing a substrate, and a reflective layer, a second dielectric layer, a recording layer and a first dielectric layer which are disposed over the substrate in this order, wherein the recording layer contains a phase-change recording material containing any one of GeSbSnMn and GeSbSnMnGa, and the second dielectric layer contains an oxide of two or more elements of Nb, Si and Ta.

Description

technical field [0001] The present invention relates to an optical recording medium on which high-density and high-speed information recording and reproduction can be performed using laser beams. Background technique [0002] In recent years phase change optical discs have been used as rewritable optical discs. Specifically, there are disc specifications for each of CD-RW, DVD+RW, DVD-RW, and DVD-RAM. However, there is a need for an optical disc on which information can be recorded and reproduced in a larger capacity, and for the overall development of a digital broadcasting infrastructure that handles high-quality, high-resolution images, and for large The development of volume file storage is in progress. Therefore, higher densities and accelerated writing speeds are required simultaneously. [0003] There have been many proposals for higher density; however, a method of realizing high-density recording by further increasing the numerical aperture of an optical pickup i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/254G11B7/257G11B7/24G11B7/258G11B7/241G11B7/243G11B7/2433G11B7/2578G11B7/2585G11B7/259
CPCG11B2007/25706G11B2007/2431G11B7/257G11B2007/2571G11B7/00454G11B7/243G11B2007/24312G11B2007/24306G11B7/258G11B2007/25715G11B7/2578G11B7/259G11B7/2433G11B2007/24314G11B7/2585G11B7/241
Inventor 让原肇岩佐博之花冈克成柴田清人金子裕治郎
Owner RICOH KK
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