Optical recording medium

A technology for optical recording media and recording layers, applied to optical recording media, optical recording/reproduction, data recording, etc., to achieve high storage reliability, maintain productivity, and high productivity

Active Publication Date: 2012-02-01
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The techniques mentioned above hardly meet this need

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0099] The present invention is specifically described below by means of specific examples, but the present invention is not limited to these examples.

[0100] (method of analyzing layer composition)

[0101] In Examples, Comparative Examples and Test Examples, the composition of each layer was determined as described below.

[0102] First, a layer whose composition is to be determined (for example, a first protective layer or a second protective layer) is deposited on a flat substrate under the same conditions as described in Examples, Comparative Examples, and Test Examples. Thus, samples were prepared. Next, the layer composition of each sample was examined using ICP mass spectrometry using an inductively coupled plasma (ICP) mass spectrometer.

[0103] (Measurement of average thickness)

[0104] In Examples, Comparative Examples and Test Examples, the average thickness of each layer was determined as described below.

[0105]First, a layer whose thickness is to be mea...

Embodiment 1

[0175] First, a polycarbonate substrate with a thickness of 1.1 mm was formed by injection molding. An uneven surface with grooves is formed on a polycarbonate substrate. Next, a third protective layer, an inorganic recording layer, a first protective layer, and a second protective layer were sequentially stacked on the polycarbonate substrate by a sputtering method. The specific structure of each layer is as follows.

[0176] The third protective layer: ITO, 8nm (average thickness)

[0177] Inorganic recording layer: [(ZnS) 80 (SiO 2 ) 20 ] 40 Sb 60 , 11nm (average thickness)

[0178] The first protective layer: ITO, 19nm (average thickness)

[0179] Second protective layer: TiO 2 , 10nm (average thickness)

[0180] Each layer was formed using a target with a diameter of 200 mm. The ITO layer used as the first protective layer and the third protective layer is passed through containing Ar and O 2 Deposited by DC sputtering of an ITO target in an atmosphere of . [...

Embodiment 2

[0183] A write-once optical recording medium was prepared according to the method of Example 1, except that the second protective layer was formed of a composite oxide of zirconia, indium oxide, and silicon oxide (SIZ).

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Abstract

An optical recording medium includes an inorganic recording layer, a first protective layer provided on at least one surface of the inorganic recording layer and containing indium oxide, and a second protective layer provided so as to be adjacent to the first protective layer and containing titanium oxide, zirconium oxide, or tin oxide.

Description

technical field [0001] The present invention relates to an optical recording medium. More specifically, the present invention relates to an optical recording medium including an inorganic recording layer. Background technique [0002] Conventionally, compact discs (CDs), digital versatile discs (DVDs), and the like have dominated the optical recording medium market. Recently, however, with the realization of high-definition television and the rapid increase in the amount of data handled by personal computers (PCs), it is expected that the capacity of optical recording media will be further increased. In order to meet these needs, large-capacity optical recording media such as Blu-ray Discs (BD, registered trademark) using blue laser light have emerged, thereby forming a new market for large-capacity optical recording media. [0003] Recordable optical recording media include rewritable optical recording media such as digital versatile disc recordable (DVD-R) and digital ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/254G11B7/24G11B7/24035G11B7/243G11B7/2433G11B7/2437G11B7/257
CPCG11B2007/25708G11B2007/24312G11B2007/25706G11B2007/2571G11B7/243G11B2007/25715G11B2007/2432G11B2007/24314G11B2007/24304G11B2007/24324Y10T428/21
Inventor 田畑浩
Owner SONY CORP
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