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Multilayer optical recording medium and optical recording method

An optical recording medium, optical recording technology, applied to optical recording media, optical recording/reproduction, data recording, etc., can solve the problem of not explaining the protective layer

Inactive Publication Date: 2008-09-03
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In addition, a multilayer phase-change information recording medium is disclosed in Patent Document 3, in which the heat dissipation layer contains ITO (indium oxide-tin oxide) and at least one of Al and Ga as main components, but there is no description The protective layer and the heat dissipation layer or the lower protective layer and the upper protective layer and the heat dissipation layer are composed of Sn oxide

Method used

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  • Multilayer optical recording medium and optical recording method
  • Multilayer optical recording medium and optical recording method
  • Multilayer optical recording medium and optical recording method

Examples

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Effect test

Embodiment 1 to 21 and comparative example 1 to 5

[0136] The recording linear velocity at the time of recording in the first recording layer was 9.2 m / s. Random recording was repeated 10 times (DOW 10) on three tracks, and the middle track among them was reproduced. Random records refer to marks and spaces in irregular records 3T to 11T and 14T1010.

[0137] In the evaluation criteria, the recording power in which the light transmittance in the first information layer is 40% or more and the degree of modulation is saturated is the optimum recording power Ppo [mW], when recording in the first information layer by Ppo The degree of modulation of is M (DOW 10), and the reflectance of the crystal after recording is Itop (DOW 10). A case of “M≧0.55 and Itop×X≧4.0%” was determined as A, a case of “M≧0.55 and 4.0%<Itop≧3.5%” was determined as B, and cases other than these cases were determined as C.

[0138] The evaluation results are collectively shown in Table 2.

Embodiment 1

[0140] ZnS (80 mol %)-SiO with a thickness of 60 nm was sequentially formed on a first substrate made of polycarbonate resin with a diameter of 12 cm and a thickness of 0.58 mm in an Ar atmosphere by a sputtering method. 2 (20mol%) constitutes the first lower protective layer, the thickness is 7.6nm by Ag 0.2 In 3.5 Sb 69.2 Te 21.1 Ge 6 The first recording layer composed of In with a thickness of 5nm 2 o 3 (7.5mol%)-ZnO(22.5mol%)-SnO 2 (60mol%)-Ta 2 o 5 (10mol%) of the first upper protective layer, a thickness of 8nm, the first reflective layer made of a material in which 1.1% by mass of Mo is added to Cu, and a thickness of 80nm of In 2 o 3 (7.5mol%)-ZnO(22.5mol%)-SnO 2 (60mol%)-Ta 2 o 5 (10mol%) to form a first information layer, wherein the first substrate has on one side a tracking guide asperity formed by continuous grooves with a track pitch of 0.74um.

[0141] By adopting the same substrate as the first substrate as the second substrate, a second reflective...

Embodiment 2

[0145] A two-layer phase-change optical recording medium was fabricated in the same manner as in Example 1, except that the thickness of the light-transmitting layer in the first information layer was changed to 60 nm in Example 1. The light transmittance in the first information layer after initialization was 43.8%.

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Abstract

A multilayer optical recording medium including at least multiple information layers having at least a phase change recording layer capable of recording information by laser irradiation and a reflection layer, wherein each information layer other than an innermost information layer as seen from a side of the laser irradiation has at least a lower protection layer, the phase change recording layer, an upper protection layer, the reflection layer and an optical transmission layer, the upper protection layer and the optical transmission layer in each information layer other than the innermost one are composed of an Sn oxide-containing material and a thickness of the upper protection layer in each information layer other than the innermost one as seen from the side of the laser irradiation is 2 nm to 15 nm is provided.

Description

technical field [0001] The present invention relates to a kind of multi-layer optical recording medium (hereinafter also referred to as "multilayer phase change information recording medium", "multilayer phase change optical recording medium", "multilayer optical disc" and "multilayer phase change optical disc" ”), which is capable of recording information by causing an optical change by laser irradiation, and has a multilayer recording layer including a phase-change recording layer capable of rewriting information, and the present invention also relates to an optical recording method in an optical recording medium. Background technique [0002] In phase-change optical discs (phase-change optical recording media) such as CD-RW, generally by forming a recording layer composed of a phase-change material on a plastic A reflective layer for heat dissipation is used to form the basic structure, and the information is recorded and reproduced by irradiating laser light from the sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/254G11B7/257G11B7/258
Inventor 关口洋义篠塚道明真贝胜日比野荣子
Owner RICOH KK
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