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

Optical information recording medium and method for manufacturing the medium

A technology for recording media and optical information, applied to optical recording media, optical recording/reproduction, information storage, etc., can solve problems such as deterioration of optical disc corrosion resistance

Inactive Publication Date: 2004-12-01
PANASONIC CORP
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moisture may deteriorate the corrosion resistance of the discs to be manufactured
Also, it has been found that optical discs manufactured according to the above-mentioned conventional method have corrosion resistance inferior to those manufactured by batch-type mass manufacturing equipment

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 method for manufacturing the medium
  • Optical information recording medium and method for manufacturing the medium
  • Optical information recording medium and method for manufacturing the medium

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0043] An example of the disk structure used in the above-described embodiments will be described.

[0044] First, as the substrate 1 , a substrate made of polycarbonate having a diameter of 120 mm and a thickness of 1.1 mm and whose surface was covered with guide grooves at a pitch of 0.3 μm and a depth of 20 nm was used. A subsequent layer is formed on the substrate 1 by magnetron sputtering, thereby forming a first information layer 100 . The layer includes: a transmittance adjustment layer 2 made of titanium oxide with a thickness of 20nm, a reflective layer 3 made of silver with a thickness of 10nm, a layer of zirconium dioxide-silicon dioxide-chromium trioxide with a thickness of 16nm The dielectric layer 50 composed of the reflective layer side dielectric layer 4 and the recording layer side dielectric layer 5 made of Ge with a thickness of 7nm 22 Sb 25 Te 53 A recording layer 6 made of (atomic percent), a dielectric layer 7 made of zirconium dioxide-silicon dioxide-...

example 2

[0067] (1) The composition of the dielectric layer 4 on the reflection layer side is fixed, while the composition of the dielectric layer 5 on the recording layer side is changed. The results of studies examining the corrosion resistance and transmittance of the recording layer side dielectric layer 5 will be described below. As shown in Table 1 below, in this study, the composition of the dielectric layer 4 on the reflective layer side was fixed at ZrO2: SiO2: Chromium trioxide = 50:20:30, and only the dielectric layer on the recording layer side was changed 5 ingredients. The rest of the disc structure etc. are the same as in Example 1.

[0068] 〔Table 1〕

[0069] sample

serial number

Zirconia Silica Chromium Trioxide Corrosion Resistance Transmittance

(mol%) (mol%) (mol%)

1

2

3

10 20 70 better 50%

30 20 50 Better 52%

50 20 30 bad 54%

[0070] It can be understood from Table 1 that the highe...

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
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

An optical information recording medium of the invention has at least two information layers. A first information layer (100) disposed at the front side (viewed from a laser incident side) includes at least a reflection layer (3), a recording layer (6) disposed at the laser incident side with respect to the reflection layer (3), for generating a reversible change between an amorphous phase and a crystalline phase that can be detected optically by applying a laser beam, and a dielectric layer (50) disposed between the reflection layer (3) and the recording layer (6). The dielectric layer (50) contains at least Zr, Si and Cr, a ratio of Zr, Si and Cr of the dielectric layer (50) at the reflection layer side is expressed as Zr:Si:Cr = p:q:r (p + q + r = 100), a ratio of Zr, Si and Cr of the dielectric layer (50) in the vicinity of the interface at the recording layer side is expressed as Zr:Si:Cr = s:t:u (s + t + u = 100), and r < u or t < q.

Description

technical field [0001] The present invention relates to an optical information recording medium for recording and reproducing information at high speed and high density by using an optical means such as a laser beam, and a method for manufacturing the medium. Background technique [0002] A technique for reproducing or recording high-density information using a laser beam is known and has been mainly commercialized as an optical disc. [0003] Optical discs are roughly classified into read-only type, write-once type, and rewritable type. Read-only types have been commercialized as compact optical discs or laser discs, and write-once and rewritable types have been commercialized as recording media for document files or data files. Rewritable optical discs include a magneto-optical type and a phase-change type. A phase-change optical disc utilizes a phenomenon in which a recording layer reversibly changes its phase between an amorphous phase and a crystalline phase (or betwe...

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): G11B7/24G11B7/243G11B7/253G11B7/2531G11B7/2533G11B7/2534G11B7/257G11B7/2578G11B7/258G11B7/259
CPCG11B2007/25706G11B2007/25708G11B7/2578G11B2007/25718G11B2007/25715G11B2007/25713G11B7/259G11B7/2531G11B7/2534G11B2007/25716G11B2007/24314G11B7/2533G11B2007/2571G11B2007/24316G11B2007/24312Y10T428/21A47K10/42B65D83/0805A47K2010/3233
Inventor 坂上嘉孝长田宪一山田升儿岛理惠西原孝史
Owner PANASONIC CORP