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Optical recording medium

A technology for optical recording media and recording layers, applied to optical recording carriers, recording carrier materials, recording layers, etc., can solve problems such as jitter, reflectivity decline, and recording composition characteristics decline

Inactive Publication Date: 2002-06-26
VICTOR ADVANCED MEDIA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a means to obtain a high degree of modulation, that is, to improve recording sensitivity, the technology of inserting Ge, Cr, Ti, and Ni thin films with high absorption in the wavelength region of semiconductor lasers is disclosed in (Japanese) Unexamined Patent Publication No. 61-272190, but Since the thin film is in contact with the recording layer, it melts with the recording layer and becomes another composition, which reduces the recording composition characteristics. In fact, when the recording layer composition is made of Ag-In-Sb-Te alloy, etc., Significant drop in jitter and reflectivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Each layer was formed on a polycarbonate resin substrate 1 having a diameter of 120 mm and a plate thickness of 0.6 mm. Grooves are formed on the substrate 1 with a track pitch of 0.74 μm. The groove depth is 30 nm, and the ratio of the groove width to the island width is about 40:60.

[0066] First, degas the vacuum container to 1×10 -5 After Pa, at 2×10 -1 In the Ar gas atmosphere of Pa, according to the high-frequency magnetron sputtering method, a layer thickness of 60nm was formed on the substrate 1 with the addition of 20mol% SiO 2 The first protective layer 2 of ZnS.

[0067] Next, in a mixed gas atmosphere of Ar and nitrogen, use a Ge target added with 20 mol% Cr to sputter the interface layer 3 with a layer thickness of 2 nm, and then use a single target of four elements consisting of Ag, In, Sb, and Te in sequence Laminate a recording layer 4 with a layer thickness of 18nm, laminate a second protective layer 5 with a layer thickness of 5nm with the same ma...

Embodiment 2

[0072] As the recording layer 4, the same optical recording medium as in Example 1 was produced except that a Ge-Sb-Te alloy was used. When the same measurement as in Example 1 was carried out, either condition a or condition b was as shown in Table 1 and Table 2, and almost the same characteristics as in Example 1 were obtained.

[0073] recording layer

[0074] recording layer

[0075] The same optical recording medium as in Example 1 was produced except that a Ge-Ti alloy target was sputtered to form a light-absorbing heat-generating layer 6 (refractive index: 3.8, attenuation coefficient: 3.4) with a film thickness of 2 nm. (Example 4)

Embodiment 4

[0076] The same optical recording medium as in Example 1 was produced except that a Si-Cr alloy target was sputtered to form a light-absorbing heat-generating layer 6 (refractive index: 3.9, attenuation coefficient: 3.7) with a film thickness of 2 nm. (Example 5)

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Abstract

An optical recording medium 10 comprises a substrate 1, first protective layer 2, interfacial layer 3, recording layer 4, second protective layer 5, light absorbing and heat generating layer 6, third protective layer 7, reflection layer 8 and a protective film 9 laminated in order. The light absorbing and heat generating layer 6 is a metal layer or an alloy layer containing more than one element out of Ge, Sn, Pb, Cr, Ti, In, Si, Cd, Se, W, Mo, Zr, Nb, Zn and Hf, so that a reflectivity of the optical recording medium 10 and an optical modulation factor, which is an optical modulation factor in a phase changing state of crystalline or amorphous, in the recording layer 4 can be always maintained in high. Accordingly, a recording sensitivity of the recording layer 4 in the optical recording medium 10 can be increased without deteriorating a characteristic such as reflectivity and jitter.

Description

technical field [0001] The present invention relates to an optical recording medium capable of recording, erasing and reproducing information by light irradiation. In particular, the present invention relates to rewritable phase-change optical recording media such as optical discs and optical cards capable of high-sensitivity and good recording at high linear velocities. Background technique [0002] Conventional technologies for rewritable phase-change optical recording media are as follows. These phase-change optical recording media can form amorphous recording marks by applying laser pulses during recording to melt and rapidly cool the recording layer. The reflectance of the recorded marks is lower than that of the case where the recording layer is in a crystalline state, and can be read as optically recorded information. To erase the recording marks, the recording layer is brought to a temperature above the crystallization temperature and below the melting point by irr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/2403G11B7/24067G11B7/243G11B7/253G11B7/2531G11B7/2533G11B7/257
CPCG11B7/252G11B7/2531G11B7/2403G11B7/257G11B7/2533G11B7/243G11B7/24067Y10T428/21
Inventor 田畑浩
Owner VICTOR ADVANCED MEDIA CO LTD