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Optical storage medium

A technology for optical recording medium and recording layer, which is applied in the direction of optical recording carrier, optical recording system, data recording, etc. It can solve the problems of increased jitter, insufficient rewriting, difficulty in obtaining recording characteristics, etc., and achieves good recording characteristics, high The effect of long-term storage stability

Inactive Publication Date: 2006-08-09
TAIYO YUDEN KK
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the composition of this recording film, it has been understood by the research of the present inventors: when carrying out 6 times speed or above DVD ultra-high linear velocity recording, although good recording characteristics and the recording characteristics of the first rewriting can be obtained, but when rewriting At about the 1000th (DOW999) time or more, the deterioration of the jitter is aggravated, and sufficient rewrite recording characteristics cannot be obtained
[0008] As mentioned above, it is difficult to obtain good recording characteristics at the high linear velocity of DVD at 6x speed or higher for the conventional phase-change recording medium containing chalcogen such as Te in the recording film
In addition, for conventional phase-change recording media in which the recording film does not contain a chalcogen element, although the recording characteristics at high linear velocity are good, sufficient rewriting characteristics cannot be obtained.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0059] Each layer described later was formed on a substrate 1 made of polycarbonate resin having a diameter of 120 mm and a plate thickness of 0.6 mm. On the substrate 1, grooves were formed with a track pitch of 0.74 μm, the groove depth was 25 nm, and the ratio of the groove width to the land width was about 40:60. In addition, the grooves are convex when viewed from the incident direction of the recording, reproducing or erasing laser light.

[0060] First, degas the vacuum container to 3×10 -4 After Pa, at 2×10 -1 In the Ar gas atmosphere of Pa, 20mol% SiO was added 2 A ZnS target was used, and a first protective layer 2 with a thickness of 66 nm was formed on the substrate 1 by high-frequency magnetron sputtering.

[0061] Next, the recording layer 3 with a thickness set to 16 nm was formed by co-sputtering using a 3-element single alloy target of Ge—Sb—In and a Sn single alloy target. The composition ratio of the recording layer 3 is Ge 12 Sb 70 In 13 sn 5 . Nex...

Embodiment 2

[0073] Composition of recording layer 3 changed to Ge 8 Sb 70 In 17 sn 5 , except that, the same optical recording medium A as in Example 1 was produced, and recording and measurement were performed.

[0074] The initial and rewrite recording characteristics are shown in Table 1. DOW0 jitter is 7.2%, DOW1 jitter is 8.5%, DOW9 jitter is 8.2%, and DOW999 jitter is 10.8%. The rewriting characteristics are very stable and the recording characteristics are good.

Embodiment 3

[0076] Composition of recording layer 3 changed to Ge 20 Sb 70 In 5 sn 5 , except that, the same optical recording medium A as in Example 1 was produced, and recording and measurement were performed.

[0077] The initial and rewrite recording characteristics are shown in Table 1. DOW0 jitter is 7.8%, DOW1 jitter is 8.9%, DOW9 jitter is 8.9%, and DOW999 jitter is 11.8%, so the rewriting characteristics are very stable and the recording characteristics are good.

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Abstract

To provide an optical recording medium which can produce successful recording properties in recording at a high lineal speed, can successfully retain the properties of performing a single round or a plurality of rounds of overwrite, and has high long-term shelf stability. A phase-changing type optical recording medium comprises a substrate 1 and at least a recording layer 3 and a reflective layer 5. A material for the recording layer 3 is a Ge-Sb-In-Sn alloy. When the respective atomic ratio of the constituent elements of the alloy is given as a, b, c and d, the relationship among following formulae (1) to (4) is satisfied: 0.08<=a<=0.20... (1), 0.60<=b<=0.80... (2), 0.05<=c<=0.20... (3), 0.01<=d<=0.15... (4), provided, however, that a+b+c+d=1.

Description

technical field [0001] The present invention relates to an optical recording medium for recording, reproducing, or erasing information by irradiation with light (for example, laser light). Particularly, the present invention relates to following optical recording medium: promptly for rewritable phase change type recording medium such as optical disk, optical card, when carrying out optical recording with high linear speed (high multiple speed), can obtain good recording characteristics, In addition, good recording characteristics and high long-term storage stability can be maintained even after multiple overwrites. Background technique [0002] The so-called phase-change optical recording media, such as CD-RW, DVD-RW, and DVD-RAM in recent years, are media in which information can be rewritable. Among them, DVD-RW and DVD-RAM are mainly used for recording and rewriting information with a large amount of information such as video information. For phase-change optical record...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/243G11B7/258G11B7/2433G11B7/2437G11B7/259
CPCG11B7/243G11B2007/2431G11B7/00454G11B7/259G11B7/266G11B2007/24314G11B7/0062G11B2007/24312
Inventor 田畑浩
Owner TAIYO YUDEN KK
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