Unlock instant, AI-driven research and patent intelligence for your innovation.

Optical information recording medium and production method therefor

A technology for recording media and optical information, which can be used in the manufacture of optical record carriers, optical record carriers, recording/reproducing by optical methods, etc., and can solve problems such as the inability to reduce poor transmittance

Inactive Publication Date: 2005-10-12
PANASONIC CORP
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, for some recording materials, the difference in transmittance between the recorded portion and the unrecorded portion of the information layer cannot be reduced only by adjusting the film thickness of the protective layer included in the information layer. , and when using these recording materials it is impossible to employ the techniques described above

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical information recording medium and production method therefor
  • Optical information recording medium and production method therefor
  • Optical information recording medium and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0084] In Example 1, the figure 1 The optical information recording medium shown. In the optical information recording medium in this example, all of the first to fourth recording layers 102, 202, 302, and 402 are composed of the write-once material Te-O-Pd, and the records contained in the respective information layers The composition ratio between the layers is varied so that the difference in transmittance among the information layers varies. In the optical information recording medium in this example, the state immediately after the film is formed (hereinafter referred to as "as depo. state") is an unrecorded state, and when a mark is recorded with an appropriate laser power, the mark portion Reflectivity is reduced. At this time, the marking portion is in a crystalline state. That is, in the optical information recording medium in this example, the as depo. state and the crystalline state correspond to state A and state B, respectively.

[0085] The method used to man...

example 2

[0108] In Example 2, making figure 2 The optical information recording medium shown. In the optical information recording medium of this example, both the first and second recording layers 102 and 202 are composed of the write-once material Te-O-Pd, and the transmittance difference of each information layer is adjusted by changing the composition ratio .

[0109] The method used in this example to manufacture the optical information recording medium is as follows.

[0110] A disc-shaped polycarbonate disc having a thickness of 1.1 mm and a diameter of 120 mm was used as the substrate 5, and spiral grooves having a width of 0.16 μm, a groove pitch of 0.32 μm, and a depth of 20 nm were formed on its surface. The second information layer 12 is formed by sputtering from the reflective layer 204 on the surface of the substrate 5 where the grooves are formed.

[0111] The reflective layer 204 is formed using Al-Cr, and has a thickness of 40 nm. Using SiO 2 A material mixed wit...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

An optical information recording medium of the present invention includes at least m (m is an integer of 2 or more) information layers, and each of the information layers includes a recording layer that changes irreversibly between a state A and a state B that are optically different from each other. In the case where the m information layers are taken as the first through m-th information layers in the order from a laser beam incidence side, when a recording layer included in the j-th information layer (j is an integer satisfying 1 <= j <= m - 1) is taken as the j-th recording layer, and when a transmittance of the j-th information layer at the time when the j-th recording layer is in the state A is TAj (%) and a transmittance of the j-th information layer at the time when the j-th recording layer is in the state B is TBj (%), the following relationship is satisfied in the j-th information layer: 0 <= 3 / 4 TAj - TBj 3 / 4 / (TAj,TBj)max <= 0.10 where (TAj,TBj)max is a larger value of TAj and TBj. Furthermore, at least one recording layer of the first through (m - 1)th recording layers is formed of a material having a complex index of refraction (n - ik, where n is a refractive index and k is an extinction coefficient) that is different from that of the m-th recording layer.

Description

technical field [0001] The present invention relates to an optical information recording medium on which information can be recorded or reproduced at high speed and high density by an optical method such as laser beam irradiation, and to a method for producing the medium. Background technique [0002] Optical information recording media such as magneto-optical recording media and phase-change recording media are recognized as information recording media having a high capacity to which information can be recorded or reproduced at high speed. These optical information recording media utilize the difference in optical properties of the recording material produced when the recording material is locally irradiated with a laser beam as a primary recording. These optical information recording media are very advantageous in that they can be randomly accessed if necessary and also have excellent portability, so their importance is increasing day by day. The demand for the medium is ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/00G11B7/24035G11B7/24038G11B7/24041G11B7/243G11B7/2433G11B7/2437G11B7/26
CPCG11B2007/24316G11B2007/24306G11B7/24038G11B7/2534G11B7/243G11B2007/2432G11B7/266G11B7/258G11B7/26
Inventor 宇野真由美西内健一儿岛理惠山田升
Owner PANASONIC CORP