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Optical storage medium and method of producing optical storage medium

A technology for recording media and manufacturing methods, applied in the fields of optical record carrier manufacturing, optical record carrier, recording/reproducing by optical methods, etc., can solve problems such as deterioration of average SER, inability to fully ensure long-term reliability, etc., and improve long-term reliability sexual effect

Inactive Publication Date: 2010-06-30
JVC KENWOOD CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The inventors of the present invention provided an optical information recording medium with an inorganic recording film through a trial production with Nb 2 o 5 An experiment was conducted to evaluate the long-term reliability of the optical information recording medium with the intermediate layer formed. As a result, it was found that the average SER was seriously deteriorated after being left in a high-temperature and high-humidity environment, and the invention described in Patent Document 1 alone was not sufficient. Ensure long-term reliability
In Patent Document 1, reproduction jitter (jitter) before and after being left in a high-temperature and high-humidity environment is compared, but only suppressing changes in jitter is not enough, and an optical information recording medium with better long-term reliability is required.

Method used

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  • Optical storage medium and method of producing optical storage medium

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Each film described later was formed on a substrate 1 made of polycarbonate having a diameter of 120 mm and a plate thickness of 1.1 mm. Grooves are formed on the substrate 1 so that the track pitch is 0.32 μm. The groove depth is 25 nm, and the width ratio of the groove and the land (Groove and Land) is about 50:50.

[0055] First, degas the vacuum container to 3 x 10 -4 After Pa, at 2×10-1 The reflective film 2 having a thickness of 80 nm was formed by magnetron sputtering using an Ag—Pd—Cu alloy target under an Ar gas atmosphere of Pa. Next, in Ar gas and N 2 A GeCrN film with a thickness of 2nm was formed as the interface film 3 by using a GeCr alloy target in a mixed atmosphere of gas, and then a 20mol% SiO 2 A ZnS target was used to form the first dielectric film 4 with a thickness of 20 nm.

[0056] In addition, in Ar gas and N 2 A GeBiN recording film 5 was formed with a thickness of 25 nm using a GeBi (element ratio 50:50) alloy target in a mixed atmospher...

Embodiment 2

[0062] In addition to changing the material of the moisture-proof film 7 to add 20mol% W 2 o 5 In 2 o 3 Except for the target, the optical information recording medium 100 of Example 2 was produced in the same manner as in Example 1. confirmed the addition of 20mol% W 2 o 5 In 2 o 3 The sputtered film is also amorphous. The average SER was measured in the same manner as in Example 1, and as a result, as shown in Table 1, the average SER obtained was 9.1×10 -5 good results. In addition, IWO in Table 1 means indium tungsten oxide.

Embodiment 3

[0064] In addition to changing the material of the moisture-proof film 7 to add 20mol% CeO 2 (Cerium Oxide) In 2 o 3 Except for the target, the optical information recording medium 100 of Example 3 was produced in the same manner as in Example 1. The addition of 20mol% CeO was confirmed 2 In 2 o 3 The sputtered film is also amorphous. As shown in Table 1, an average SER of 6.8×10 was obtained -5 good results. In addition, ICO in Table 1 means indium cerium oxide.

[0065] In the above Examples 1 to 3, by using In 2 o 3 The moisture-proof film 7 is formed by sputtering the target, but it is also possible to use In which is a mixture of two or three of tin oxide, tungsten oxide, and cerium oxide. 2 o 3 target.

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Abstract

An optical storage medium has a substrate and a cover layer that allows light to pass therethrough in recording or reproduction. Provided between the substrate and the cover layer are at least a reflective film, a first dielectric film, a recording film, and a second dielectric film formed in this order from the substrate side. Provided further between the second dielectric film and the cover layer is a damp-proof film that is at least partially an amorphous film and contains at least an indium oxide.

Description

technical field [0001] The present invention relates to an optical information recording medium and a manufacturing method of an optical information recording medium that uses, for example, laser light to record or reproduce information, and particularly relates to a write-once optical information recording medium and an optical information recording medium having a structure in which a recording layer is disposed near one surface of the optical information recording medium. A method of manufacturing an information recording medium. Background technique [0002] Conventionally, as an optical information recording medium for recording or reproducing information using laser light, DVD is the mainstream, but Blu-ray Disc (Blu-ray Disc) having a larger recording capacity than DVD is appearing and spreading. DVDs and Blu-ray Discs (hereinafter abbreviated as BDs) are discs with a diameter of 12 cm and a thickness of 1.2 mm, but they differ in the following points. In DVD, the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/252G11B7/26G11B7/24G11B7/2403G11B7/24056G11B7/254G11B7/257
Inventor 田畑浩须本宇航
Owner JVC KENWOOD CORP
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