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Optical information recording medium

A technology for recording media and optical information, applied in the direction of optical record carrier, optical record carrier manufacturing, data recording, etc., can solve the problem of low initialization efficiency

Inactive Publication Date: 2004-11-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, it is conceivable that even taking into account the initialization order of the layers, the initialization is still very inefficient

Method used

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

Examples

Experimental program
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Effect test

no. 1 example

[0085] When the transmittance of the second information layer in the amorphous state is Ta2 at the wavelength of the laser beam for initialization, and the transmittance in the crystalline state is Tc2, the results of the examination of the sizes of Tc2 and Ta2 and the information layers The initialization sequence is described.

[0086] The structure of the disk used for the examination is as follows. The structure of the first information layer is 100nm Ag reflective layer, 5nm GeN layer, 25nm ZnS-20mol% SiO 2 layer, 15nm GeSbTe recording layer and 60nm ZnS-20mol% SiO 2 Floor. As for the second information layer, two different types of recording layer compositions are provided. For disc 1, after forming a light separation layer on the first information layer, there is a 10nm Ag reflective layer, a 5nm GeN layer, a 24nm ZnS-20mol% SiO 2 layer, 6nm GeSbTe recording layer and 50nm ZnS-20mol% SiO 2 Floor. Disc 2 has the same film thickness of each layer as that of disc 1, ...

no. 2 example

[0103] When the second information layer in an amorphous state has a transmittance Ta2 and a reflectance Ra2 at the wavelength of the laser beam at which the initialization is performed, said transmittance Tc2 and a reflectance Rc2 in a crystalline state, without lamination When the second information layer has a reflection coefficient of Ra1 in the amorphous state and a reflection coefficient of Rc1 in the crystalline state of the first information layer in the crystalline state, it was examined which situation provides a better initialization yield. That is to say, when initializing the second information layer after initializing the quantitative relationship between Rc1 and Ra1 and the first information layer, whether to initialize from the amorphous region of the first information layer or from the crystalline region. The results of the examination are as follows.

[0104] The disk structure used in this examination is as follows. The structure of the first information la...

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Abstract

An error may occur at initialization depending on the thin film constructions of first and second information layers when the first and second information layers are initialized in an optical disk of a phase-change, single-sided, multiplayer construction. An optical information recording medium, wherein a reflectance, at the wavelength of a laser beam for pre-crystallizing a recording layer at the interface between the crystallizing area and the amorphous area of at least one information layer, that is, in the area of another information layer area in a position facing the initialization starting position of one information layer, is lower than that at the above wavelength in another area of another information layer.

Description

technical field [0001] The present invention relates to an optical information recording medium that records and reproduces optical information at high speed and high density by using an optical means such as a laser beam. Background technique [0002] The technique of reproducing or recording high-density information using a laser beam is in the known field, and in practical applications, it is mainly used as an optical disc. [0003] Optical discs can be broadly classified into reproduction-only types, recordable types, and rewritable types. In practice, reproduction-only types are used for compact discs and laser discs, and recordable and rewritable types are used for document files, data files, and the like. Rewritable optical discs are mainly classified into a magneto-optical type and a phase change type. Phase-change optical discs utilize a reversible state change of a recording layer between an amorphous state and a crystalline state (or between a crystal of a diffe...

Claims

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Application Information

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IPC IPC(8): G11B7/24038G11B3/74G11B7/0055G11B7/241G11B7/2433G11B7/257G11B7/26
CPCG11B7/268G11B7/241G11B7/257G11B7/24038G11B7/2433G11B7/0055G11B7/26
Inventor 坂上嘉孝长田宪一
Owner PANASONIC CORP