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Optical recording medium

An optical recording medium and recording layer technology, which is applied in the directions of data recording, temperature recording, recording/reproducing by optical methods, etc., can solve the problems such as the inability to obtain the effect and the lack of the medium structure of the low thermal conductivity layer.

Inactive Publication Date: 2006-11-01
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] However, in any of the above-mentioned documents, there is no such low thermal conductivity of less than or equal to 10 W / m·K between the second protective layer and the reflective layer having a thermal conductivity greater than or equal to 300 W / m·K of the present invention. Layer media structure and its effects
Furthermore, as shown in the comparative examples described later, the effects of the present invention cannot be obtained by combinations that do not satisfy the above conditions.

Method used

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  • Optical recording medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] On the substrate 1, a first protective layer 2, a phase change recording layer 3, a second protective layer 8, a low thermal conductivity layer 4, and a reflective layer 5 are sequentially formed by sputtering, and a resin protective layer 6 is formed on it by a spin coating method. , and finally, the bonding substrate 7 is bonded, and an optical recording medium having the layer structure shown in FIG. 1 is produced and initialized.

[0124] As the substrate 1 , a polycarbonate substrate having a diameter of 12 cm and a thickness of 0.6 mm and a track pitch of 0.74 μm with guide grooves was used.

[0125] The first protective layer 2 uses ZnS-SiO with a thickness of 60nm 2 (80:20 mol%) (κ8.6W / m·K).

[0126] The phase change recording layer 3 uses Ga with a thickness of 16nm 12 Sb 88 .

[0127] The second protective layer 8 uses ZnSSiO with a thickness of 7nm 2 (80:20 mole %).

[0128] Low thermal conductivity layer 4 uses ZrO with a thickness of 4nm 2 (contains...

Embodiment 2

[0140] In addition to changing the material of the low thermal conductivity layer 4 to ZrO 2 (contains 3 mol% Y 2 o 3 )-20mol%TiO 2 Except for the point of (κ2.0W / m·K), an optical recording medium was fabricated and initialized in the same manner as in Example 1, and then evaluated.

Embodiment 3

[0142] In addition to changing the material of the low thermal conductivity layer 4 to ZrO 2 (contains 3 mol% Y 2 o 3 )-10 mol% SiO 2 Except for the point of (κ3.5W / m·K), an optical recording medium was fabricated and initialized in the same manner as in Example 1, and then evaluated.

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Abstract

An optical recording medium having favorable recording sensitivity and repetition recording characteristic is used for recording at high speed corresponding to the speed of a 3X to 10X (10 to 36 m / s) DVD. The optical recording medium is characterized in that on a transparent substrate at least a first protective layer, a phase-change recording layer whose maximum recording linear velocity is 10.0 m / s or more and where data is rewritable at least at any linear velocity between 10.0 to 36.0 m / s, a second protective layer, and a reflective layer of heat conductivity of 300 W / m.K or more are formed, and in that further a layer whose film thickness is between 0.5 and 8 nm and which is formed of a low heat-conductivity material having a heat conductivity of 7 W / m.K or less is interposed between the second protective layer and the reflective layer.

Description

technical field [0001] The present invention relates to a rewritable optical recording medium. Background technique [0002] In recent years, with the increase in the amount of information, recording media capable of recording and reproducing a large amount of data at high density and at high speed are required. A phase-change optical recording medium, especially a phase-change optical disc, which irradiates light beams and performs recording and reproduction of information, has excellent signal quality and can be increased in density. Easy and high-speed access recording medium. [0003] Such a phase-change optical disc generally has a structure in which at least a first protective layer is sequentially provided on a light-transmitting substrate having a concave guide groove for guiding laser scanning, and a reversible phase change between an amorphous phase and a crystalline phase is performed. The phase change recording layer, the second protective layer, the reflective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/26G11B7/254
Inventor 安部美树子伊藤和典出口浩司大仓浩子加藤将纪
Owner RICOH KK
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