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Optical information recording medium

A technology for recording media and optical information, used in optical record carriers, recording layers, optical record carrier manufacturing, etc.

Active Publication Date: 2012-08-08
SONY CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for recording layers other than the recording layer located at the deepest portion on the side of the information recording surface, if the transmittance of the information signal layer changes greatly before and after recording the information signal, due to the effective The intensity of the laser light is changed without properly performing the recording of the information signal on the layer of the deepest part

Method used

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  • Optical information recording medium
  • Optical information recording medium
  • Optical information recording medium

Examples

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example

[0155] Although the present invention will be described in detail below using experimental examples, the present invention is not limited to these experimental examples.

[0156] Hereinafter, the information signal layers of the multilayer optical information recording medium are referred to as L0 layer, L1 layer, L2 layer, . . . in order from the substrate side to the laser irradiation surface side.

[0157] Hereinafter, the extinction coefficients of the first protective layer and the second protective layer were measured as follows in the test examples. After fabricating a sample in which a first protective layer or a second protective layer of about 100 nm was laminated on a silicon wafer, the temperature at The medium records the extinction coefficient of the sample at a wavelength of 405nm.

[0158] The test examples are described below in the following order.

[0159] 1. Materials of the first protective layer and the second protective layer

[0160] 2. PdO materials...

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Abstract

An optical information recording medium including: a substrate; two or more information signal layers provided on the substrate; and a cover layer provided on the information signal layers, wherein the surface of one of the side of the substrate and the cover layer is a light irradiation plane, wherein at least one of the information signal layers other than the information signal layer at the deepest portion from the light irradiation plane includes an inorganic recording layer that includes a W oxide and a Pd oxide, a first protective layer that is provided on a first principal plane of the inorganic recording layer, and a second protective layer that is provided on a second principal plane of the inorganic recording layer, wherein at least one of the first protective layer and the second protective layer is a layer with an extinction coefficient of 0.05 to 0.6.

Description

technical field [0001] This application relates to optical information recording media. In particular, the present application relates to optical information recording media having more than two information signal layers. Background technique [0002] The market for optical information recording media is still dominated by CDs (Compact Discs), DVDs (Digital Versatile Discs) and the like. However, in recent years, with the expansion of high-definition televisions and the remarkable increase of data handled by PCs (Personal Computers), the demand for the capacity of optical information recording media has further increased. In order to meet such demands, mass storage optical information recording media compatible with such as BD (Blu-ray Disc (registered trademark)) have emerged, and a new market for mass storage information recording media is being established. [0003] Although there are writable optical information recording media represented by CD-RW (Compact Disc-Record...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/26G11B7/2403G11B7/24038G11B7/24056G11B7/243G11B7/2433G11B7/254G11B7/257G11B7/2578
CPCG11B7/2578G11B2007/25715G11B7/24038G11B7/2403Y10T428/21
Inventor 田畑浩
Owner SONY CORP
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