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

Optical recording medium

An optical recording medium and recording technology, which can be used in optical record carriers, optical record carrier manufacturing, data recording, etc., and can solve problems such as substrate deformation, thermal expansion of disk substrates, and partial deformation of marks forming

Inactive Publication Date: 2010-08-11
SONY CORP
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, specifically, recording of marks to the reflective film may be performed by relatively high-power laser irradiation, whereby, when a predetermined mark is recorded, a problem may arise that the temperature of this recording portion rises, thereby cause localized thermal expansion of the disc substrate; cause deformation of the substrate itself corresponding to said marks, etc.
[0024] In this case, as described above, at the time of recording a mark as sub data, since relatively high-power laser light is irradiated to the reflective film 102, deformation may occur at the portion (X) where the mark is formed through thermal expansion according to temperature rise

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 recording medium
  • Optical recording medium
  • Optical recording medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] As described above, the substrate 101 of the concave / convex pattern in which the pits and lands corresponding to the main data are formed is provided.

[0098] By means of the simultaneous spraying of Ag (silver) and W (tungsten), by making the alloy film reach the thickness of this case, more specifically the reflective film 102 with a thickness of 40 nanometers, the Ag 100-x W x On this substrate 101, a reflective film 102 made of an Ag-alloy film expressed in (atomic percent) was formed.

[0099] Then, samples of x=3.5, x=7 and x=10 are provided to indicate the different characteristics of the W (tungsten) composition in this composition.

Embodiment 2

[0101] In this embodiment, by means of the method of spraying Ag (silver) and Ta (tantalum) simultaneously, by forming a reflective film 102 with a thickness of 40 nanometers, Ag 100-x Ta x An Ag-alloy film expressed in (atomic percent) was formed on the same substrate 101 as in Example 1.

[0102] Then, samples of x=1.8, x=7 and x=10 are provided to indicate different characteristics of the Ta (tantalum) composition.

Embodiment 3

[0104] By means of the simultaneous injection of Ag (silver) and Ti (titanium), Ag 100-x Ti x A reflective film made of an Ag-alloy film expressed in (atomic percent) was formed on the same substrate 101 as in Embodiment 1. The thickness is 40 nm. In addition, samples of x=7, x=10 and x=13 are provided to indicate different characteristics of the Ti (titanium) composition.

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
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

An optical recording medium is provided. The optical recording medium includes at least a reflective film and a cover layer on a substrate; main data by a combination of pit and land are recorded on the substrate; a write-once recording is made to be possible on the reflective film by irradiating a laser light; sub-data are recorded by a mark that is formed by the irradiation of laser light for the write-once recording with respect to the reflective film; a reproducing signal level at portion where said mark is formed increases for the land of specified length; the mark by which the reproduced level decreases at the portion where the mark is formed is formed for an optical disc recording medium manufactured by physical copy; the reflective film is composed of an Ag-alloy film of Ag100-xXx(0<x<100); and the X is selected from Ti, W, Ta, V, Mo, Nb and Zr.

Description

technical field [0001] The present invention relates to an optical recording medium, in particular to an optical recording medium capable of effectively performing detection or preventing illegal copy versions. Background technique [0002] Because many replica substrates can be produced in a short period of time with one laminated film through an injection molding process, optical discs as optical recording media, especially playback-only ROM (read-only memory) discs, are widely used as program package media in the world. usage of. [0003] As ROM disks for recording music, pictures, and the like, for example, CDs (Compact Disks), DVDs (Digital Versatile Disks), and the like are common in the market. [0004] From the past, on the basis of ROM discs sold as package media, duplicate version (so-called pirated) discs that illegally duplicate recorded data have been produced, and this has caused a problem of copyright infringement. [0005] Regarding pirated discs, generally...

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 Patents(China)
IPC IPC(8): G11B7/24G11B7/258G11B7/26G11B7/00G11B7/259
CPCG11B20/00086G11B7/0053G11B7/259G11B20/00594G11B20/10G11B2220/218G11B20/00115G11B20/00688G11B2220/2541Y10T428/21
Inventor 坂本哲洋下马隆司高川繁树中野淳藤田五郎
Owner SONY CORP