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Information recording medium and method for manufacturing the same

A technology for information recording and media, applied in the manufacture of optical record carriers, temperature recording methods, optical record carriers, etc., can solve the problems of lower C/N ratio, lower recording and reproduction characteristics, etc.

Inactive Publication Date: 2010-02-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to experiments by the inventors, it has been found that when information is recorded at a recording density higher than the experimental conditions described in Patent Document 2, the C / N ratio decreases and the recording and reproduction characteristics decrease.

Method used

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  • Information recording medium and method for manufacturing the same
  • Information recording medium and method for manufacturing the same
  • Information recording medium and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] In Example 1, the influence of the composition of the recording layer on the C / N ratio and reproduction durability was investigated when a Sb—O—Ge-based material was used as the recording material. A plurality of information recording media (optical discs) each having a different composition of the recording layer were prepared as samples and evaluated. The details are shown below.

[0116] In this example, the production has figure 2 An information recording medium 1 having the configuration shown. A substrate made of polycarbonate resin was used as the substrate 2 . The substrate 2 has a diameter of 12 cm and a thickness of 1.1 mm, and has guide grooves on one surface. The guide grooves had a groove pitch of 0.32 μm and a groove depth of 20 nm.

[0117] Using an Al-Ni (atomic ratio 96.0:4.0) target, an Al-Ni reflective layer 3 with a thickness of 80 nm was formed on the surface of the substrate 2 on the side where the grooves were formed by sputtering. Next, usi...

Embodiment 2

[0135] In embodiment 2, to use Sb-O-Zn series material, Sb-O-Ni series material, Sb-O-Te series material, Sb-O-C series material, Sb-O-Cu series material, Sb-O-Ge - Zn-based materials, Sb-O-Ge-Ni-based materials, Sb-O-Ge-Te-based materials, Sb-O-Ge-C-based materials, and Sb-O-Ge-Cu-based materials are used as recording materials to form recording layers The C / N ratio and reproduction durability of the recording medium (disk) were evaluated. When the composition of the recording layer is a ternary system, set Sb:O:M=50:40:10; when it is a quaternary system, set Sb:O:M1:M2=45:35:10: 10. The film composition of the sample (only the composition of the recording layer is different from Example 1), the film formation conditions of each layer, and the evaluation method of the disc are the same as those described in Example 1. Table 2 shows the evaluation results of the discs.

[0136] [Table 2]

[0137] plate

Composition of record layer [at%]

C / N ratio

regen...

Embodiment 3

[0141] In embodiment 3, adopt Sb-O-M series material (here, Sb-O-Ge system material is used as a representative example) to constitute the recording layer of the information recording medium having two layers of information layers, and in the same manner as in embodiment 1, the recording Effect of layer composition on C / N ratio and playback durability of recording medium (optical disk).

[0142] made with image 3 An information recording medium of the configuration shown. A substrate made of polycarbonate resin was used as the substrate 10 . The substrate had a diameter of 12 cm and a thickness of 1.1 mm, and had guide grooves on one surface. The guide grooves had a groove pitch of 0.32 μm and a groove depth of 20 nm.

[0143] The first information layer 15 is formed on the surface of the substrate 10 on which the grooves are formed. The first information layer 15 has a reflective layer 14 , a first dielectric layer 12 , a recording layer 13 , and a second dielectric laye...

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Abstract

Provided is a low-cost information recording medium, by which excellent signal qualities can be obtained even when high density recording is performed by using a blue laser. The information recordingmedium records and reproduces information by irradiating a laser beam on a recording layer. When the total number of Sb atoms, O atoms and M atoms contained in the recording layer is 100 atm%, the content rate of the O atoms is 20 atm% or more but not more than 70 atm%, the content rate of the M atoms is 1 atm% or more but not more than 50 atm%, and the content rate of the Sb atoms is 10 atm% or more but not more than 70 atm%, and the recording layer is configured not to contain Au, Pt and Pd.

Description

technical field [0001] The present invention relates to an information recording medium capable of recording and reproducing information at high density and high speed by using optical means such as laser beam irradiation and a method for manufacturing the same. Background technique [0002] An optical information recording medium is known as an information recording medium capable of recording and reproducing information at high speed and having a large capacity (hereinafter referred to as "recording medium" or "medium"). Recording and reproduction of information on this optical information recording medium is carried out by changing the recording material to an optically distinguishable state by heat generated when the recording material is irradiated with a laser beam. This recording medium has the remarkable advantages of being randomly accessible as needed and having excellent transferability, and therefore its importance has been increasing in recent years. [0003] E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/243G11B7/254B41M5/26G11B7/257G11B7/24G11B7/26G11B7/24035G11B7/24038G11B7/2433G11B7/2437G11B7/2578G11B7/2585
CPCG11B2007/24328G11B7/2437G11B7/2578G11B7/266G11B2007/24314G11B2007/24308G11B7/2433G11B7/24038G11B2007/2432G11B2007/24316G11B7/2585G11B2007/24312G11B2007/24304
Inventor 土生田晴比古山田升
Owner PANASONIC CORP
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