Optical information recording medium and its manufacturing method, recording and playback method and device

A technology for recording media and optical information, applied in the manufacture of optical record carriers, optical recording/reproduction/erasing methods, optical record carriers, etc., can solve the problems of large changes in optical characteristics and optical constants, and achieve good recording and playback The effect of the characteristic

Inactive Publication Date: 2004-03-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Even if the wavelength of the laser light used for recording and playback changes, the thermal characteristics of the recording material are basically the same, but there are cases where the optical characteristics, especially the optical constants, vary greatly depending on the material

Method used

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  • Optical information recording medium and its manufacturing method, recording and playback method and device
  • Optical information recording medium and its manufacturing method, recording and playback method and device
  • Optical information recording medium and its manufacturing method, recording and playback method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] As the substrate, a substrate made of polycarbonate resin, having a diameter of about 12 cm, a thickness of about 0.6 mm, and a groove pitch of about 0.70 μm and a depth of about 40 nm for laser guiding grooves (groove) was used.

[0087] A ZnS dielectric layer with a film thickness of about 60 nm formed using a ZnS target, and a film formed with a Te-Pd (atomic ratio: 90:10) target were sequentially laminated on the surface of the substrate on which grooves were formed by sputtering. Te-O-Pd recording layer about 40nm thick. Both use a target with a diameter of 100mm and a thickness of about 6mm. The dielectric layer is formed with a 500W RF power supply, and the recording layer is formed with a 100W DC power supply. In addition, the dielectric layer is formed in an atmosphere of Ar only. Ar and O 2 Film formation was performed in an atmosphere of mixed gas (flow ratio 45:55), and the pressure of the atmosphere was kept at 0.2 Pa.

[0088] A dummy substrate was bonde...

Embodiment 2

[0095] As the substrate, a substrate made of polycarbonate resin, having a diameter of about 12 cm, a thickness of about 0.58 mm, and a groove pitch of about 0.70 μm and a depth of about 40 nm for laser guiding grooves (groove) was used.

[0096] As the first information layer, a ZnS dielectric layer with a film thickness of about 70 nm was formed using a ZnS target, and a Te-Pd (atomic ratio: 90:10 ) target to form a Te-O-Pd recording layer with a film thickness of about 20 nm. In addition, as the second information layer, a Te-Pd (atomic ratio: 90:10) target with a film thickness of about 40 nm was sequentially laminated on the surface of another same substrate on which grooves were formed by the sputtering method. -O-Pd recording layer, and a ZnS dielectric layer with a film thickness of about 60 nm formed using a ZnS target. Both use a target with a diameter of 100mm and a thickness of about 6mm. The dielectric layer is formed with a 500W RF power supply, and the recordin...

Embodiment 3

[0102] Figure 7 It is a cross-sectional view of an optical information recording medium in Example 3 of the present invention.

[0103] As the protective layer 4, a polycarbonate resin substrate having a diameter of about 12 cm, a thickness of about 1.1 mm, and a groove pitch of about 0.32 μm and a depth of about 30 nm for laser guidance was used.

[0104] As the fourth information layer 34, Te-O with a film thickness of about 40 nm was sequentially laminated on the surface of the protective layer 4 on which grooves were formed by sputtering using a Te-Pd (atomic ratio: 90:10) target. - The Pd recording layer and the ZnS dielectric layer with a film thickness of about 60 nm were formed using a ZnS target. The same groove pattern as that of the protective layer was replicated on the surface of the fourth information layer 34 by 2P (photopolymerization) using an ultraviolet curable resin to form a separation layer 8c having a thickness of about 10 micrometers. As the third in...

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Abstract

An optical information recording medium comprises a transparent substrate 1 on which an information layer 21 is disposed, the information layer 21 comprising a recording layer 3 and a dielectric layer 2, and the recording layer 3 containing Te, O and M (wherein M is one or more elements selected from Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag, In, Sn, Sb, Hf, Ta, W, Re, Os, Ir, Pt, Au and Bi), wherein a content ratio of 0-atom in the recording layer ranges from 25 atomic percent to 60 atomic percent, and a content ratio of M-atom therein ranges from 1 atomic percent to 35 atomic percent, and a refractive index n of the dielectric layer 2 is not less than 1.5 . Accordingly, a write-once optical information recording medium, from which excellent recording reproduction characteristics with a high C/N ratio can be obtained even for recording and reproduction of high density information using a violet laser beam, is provided as well as a manufacturing method, a recording and reproduction method and a recording/reproduction device for the same.

Description

technical field [0001] The present invention relates to a write-once optical information recording medium capable of recording and reproducing high-quality information signals by irradiating a thin film formed on a substrate with a high-energy beam such as a laser beam, and its manufacturing method, recording and Playback method and recording and playback apparatus. Background technique [0002] A technique for recording and reproducing information signals by forming a thin film on a transparent substrate and irradiating the thin film with laser beams reduced to a spot is well known. Te and TeO on substrates have been disclosed 2 mixture of TeO x A material film whose main component is (0<x<2) is used as a write-once recording medium for such recording and reproduction (JP-A-50-46317). Such a recording medium can obtain a large change in reflectance when irradiated with a light beam for reproduction. [0003] With the TeO x The recording film as the main component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0045G11B7/005G11B7/243G11B7/253G11B7/2534G11B7/257G11B7/26
CPCG11B2007/25706G11B2007/25713G11B2007/25715G11B2007/25711G11B7/2534G11B7/0052G11B7/00454G11B2007/2432G11B7/243G11B2007/2571G11B2007/24316G11B7/26Y10T428/21
Inventor 北浦英树山田升
Owner PANASONIC CORP
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