Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Dual-layer recordable optical recording medium

An optical recording medium, double-layer technology, applied in the direction of optical recording carrier, data recording, recording carrier material, etc., can solve the problems of insufficient rewriting characteristics of the optical disc, and the high transmittance of the first information layer, etc., and achieve a small refractive index , high sensitivity, high reflectivity effect

Inactive Publication Date: 2007-08-29
RICOH KK
View PDF9 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, nitrides and carbides are more likely to generate cracks on the thermal diffusion layer due to their high stress, resulting in insufficient rewriting characteristics of the optical disc provided with the thermal diffusion layer
[0019] Furthermore, carbides greatly absorb light, especially at shorter wavelengths, causing the problem that first-generation carbides made of carbides cannot be integrated in next-generation systems such as the Blue-ray Disc system using blue-violet lasers. The transmittance of the information layer is made larger

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
  • Dual-layer recordable optical recording medium
  • Dual-layer recordable optical recording medium
  • Dual-layer recordable optical recording medium

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0099] (Preparation of double-layer recordable optical recording media)

[0100] First and second substrates made of polycarbonate resin, each having a diameter of 120 mm, a thickness of 0.58 mm, and grooves (depth=21 nm, track pitch=0.43 μm) on its surface, were prepared first.

[0101] In a single-wafer sputtering apparatus (Balzers), the following layers are sequentially deposited on the first substrate to form the first information layer: 2 o 3 A compound layer containing typical elements made of Bi 2 o 3 Made of Re layer with a thickness of 20nm, made of ZnS-SiO 2 (80:20 (mol%)) and a thickness of 20 nm, a reflective layer made of Ag and a thickness of 15 nm, and a thermal diffusion layer made of IZO and a thickness of 50 nm.

[0102] In a similar manner, the following layers were sequentially deposited on the second substrate to form the second information layer: a reflective layer made of Ag with a thickness of 100 nm, a layer made of ZnS-SiO 2 (80:20 (mol%)) and a...

example 2

[0109] A double-layer recordable optical recording medium was fabricated in a manner similar to that described in Example 1, except that T2 was set differently by changing T1 (thickness of the Ag reflective layer of the first information layer) and T2 (thickness of the IZO thermal diffusion layer) / T1 ratio, and measure the value of PRSNR. More specifically, various T2 / T1 ratios were obtained by setting the thickness (T1) of the Ag reflective layer at 10 nm, 15 nm, and 20 nm and setting a different thickness (T2) for each thickness.

[0110] From the measurement results shown in Figure 2, it can be seen that the line corresponding to the PRSNR of the second information layer shows a rapid decline when T2 / T18. decline.

example 3

[0112] Dual-layer recordable optical recording media were fabricated in a manner similar to that described in Example 1, except that thermal diffusion layers having various thicknesses were used. PRSNR values ​​were then measured.

[0113] From the measurement results shown in Figure 3, it can be seen that the line corresponding to the PRSNR of the first information layer shows a rapid decline when the thickness of the thermal diffusion layer is less than 30nm, and the line corresponding to the PRSNR of the second information layer decreases when the thickness of the thermal diffusion layer >90nm showed a rapid decline.

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

The invention provides a double-layer recordable optical recording medium, which includes a first information layer; a middle layer disposed on the first information layer; a second information layer disposed on the middle layer. The first information layer, the middle layer, the second information layer are deposited in sequence from laser irradiation side, wherein the first information layer from the laser irradiation side at least includes: membrane containing Bi as primary component, dielectric layer, reflection layer and heat diffusion layer, The second information layer from the laser irradiation side at least includes: membrane containing Bi as primary component, dielectric layer, reflection layer, and the region of the ratio t2 / t1 of the thickness (t2) of the dielectric layer of the second information layer to the thickness (t1) of the dielectric layer of the first information layer is 0.7 to 1.5 or 4.5 to 6.0.

Description

technical field [0001] The present invention relates to recordable (write once read many (WORM)) optical recording media on which high density recording is possible even in the blue laser wavelength range, and more particularly to optical recording media having at least a first information layer, A double-layer recordable optical recording medium of an intermediate layer, and a second information layer. Background technique [0002] Examples of optical recording media capable of recording using laser beam irradiation are, for example, recordable optical recording media such as CD-R and DVD-R. These optical recording media are supported to be compatible with CD-ROM and DVD-ROM in terms of information reproduction, and both are used as small-scale distribution media and storage media. However, CD-Rs and DVD-Rs based on organic dyes are mostly used at present, which can be produced in large quantities at low cost. If the number of layers to be deposited is large, the manufact...

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): G11B7/24G11B7/243G11B7/252G11B7/257
Inventor 藤井俊茂笹登林嘉隆藤原将行三浦裕司篠塚道明真贝胜关口洋义岩佐博之山田胜幸鸣海慎也加藤将纪
Owner RICOH KK
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com