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Optical record medium, optical information processing apparatus, and optical recording/reproducing method

一种光记录媒体、记录层的技术，应用在光学记录/再现/擦除方法、用光学方法记录/重现、光学记录载体等方向，能够解决光量不足等问题

Inactive Publication Date: 2005-04-27
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the disclosed technology, its reflectivity varies from 30% to 40%, only a 10% change
This is due to the limitation caused by the nonlinear optical effect material used on the first recording layer 12 or the second recording layer 16, and there is a problem of insufficient light quantity if there are more layers.

Method used

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  • Optical record medium, optical information processing apparatus, and optical recording/reproducing method
  • Optical record medium, optical information processing apparatus, and optical recording/reproducing method
  • Optical record medium, optical information processing apparatus, and optical recording/reproducing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] figure 1 The cross-sectional structure of the optical recording medium of Example 1 is shown. This optical recording medium is a multilayer optical recording medium in which a first recording layer 751, a second recording layer 752, and a final recording layer 754 are sequentially provided on a substrate 701 from the light (L0) incident side. Separation films 731 and 732 are provided between the respective recording layers.

[0032] The first recording layer 751 and the second recording layer 752 are layers of the same structure, and have recording films 721, 722, dielectric films 711, 713, and a reflection control film (corresponding to a variable reflection film) arranged in this order from the light (L0) incident side. 735, 736 and the structure of the dielectric film 712, 714.

[0033]The final recording layer 754 composed of the recording film 723 , the dielectric film 715 , and the reflective film 702 is arranged, and the second recording layer 752 and the sepa...

Embodiment 2

[0045] The optical recording medium of embodiment 2 is the recording layers 751, 752 other than the final recording layer 754 of the optical recording medium of embodiment 1 and Figure 6 A structure obtained by replacing the structure shown. in addition, Figure 6 The case of reading and writing on the first recording layer 751 is shown in .

[0046] Figure 6 Among them, 711 and 712 represent dielectric films, and 735 represents a reflection control film, which is the same as that of Embodiment 1. The recording film 721 is substantially transparent to the light L0 and records information based on the difference in refractive index. Furthermore, the heat-absorbing film 746 is made of a material that is translucent to the light L0. For example, when the light L0 is laser light with a wavelength of about 650 mm, the heat-absorbing film 746 can be an amorphous silicon film. The heat-absorbing film 746 absorbs the light L0 to generate heat. The generated heat heats the refl...

Embodiment 3

[0052] The optical recording medium of embodiment 3 is the recording layers 751, 752 other than the final recording layer 754 of the optical recording medium of embodiment 1 and Figure 7 The structure shown is substituted for the structure. in addition, Figure 7 The situation when reading and writing on the first recording layer 751 is shown in .

[0053] exist Figure 7 Among them, 711 and 712 represent dielectric films, and 735 represents a reflection control film, which is the same as that of Embodiment 1. The recording film 721 is substantially transparent to the light L1 of the wavelength λ1 and the light L2 of the wavelength λ2, and records information by utilizing a change in refractive index due to heat. Furthermore, the wavelength selection film 743 is made of a material that is semitransparent to the light L2 and transparent to the light L1. For example, when the wavelength λ1 of the light L1 is about 430 nm, and the wavelength λ2 of the light L2 is about 650 n...

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Abstract

A first recording layer and a second recording layer among a plurality of recording layers have a recording film and a reflection control film composed of silver oxide, and the reflection control film is interposed between dielectric films. The reflection control film utilizes heat generated from the recording film by light irradiation, thereby forming a high-reflection region in a portion at a temperature equal to or higher than a threshold temperature for forming a high-reflection region. Thus, an optical loss in the portions other than a recording layer to be recorded / reproduced is reduced, whereby a light efficiency is enhanced.

Description

technical field [0001] The present invention relates to an optical recording medium such as an optical disc or an optical card for optically recording / reproducing information, an optical information processing device and an optical recording and reproducing method for recording / reproducing information on the optical recording medium. Background technique [0002] In recent years, with the development of society's informatization, people wish to have large-capacity external storage devices. In the recording of optical information, due to the diffraction limit determined by the wavelength of light and the numerical aperture of the objective lens, the traditional method of reducing the size of recording bits to achieve high density has limitations. In order to solve such problems, a multilayer optical recording medium provided with a plurality of recording layers has been proposed. For the recording layer of a multilayer optical recording medium, a translucent film capable of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/004G11B7/0045G11B7/125G11B7/1275G11B7/1356G11B7/257G11B7/258
CPCG11B2007/2571G11B7/00455G11B7/00454G11B2007/0013G11B7/259G11B2007/25716G11B7/252G11B7/1275G11B2007/25715G11B7/24038B82Y10/00G11B7/004G11B7/1356G11B2007/25706
Inventor 山本博昭门胁慎一
Owner PANASONIC CORP
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