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Write-once-read-many optical recording medium

A technology for optical recording media and multiple reads, applied to optical recording media, recording/reproducing with optical methods, data recording, etc., can solve the problems that did not mention the applicability of optical recording media, etc.

Inactive Publication Date: 2007-11-28
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the conventional technologies described in Patent Documents 3-6 are limited by patents related to materials and manufacturing methods, and these documents do not mention the applicability of write-once-read-many optical recording media

Method used

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  • Write-once-read-many optical recording medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0185] As shown in FIG. 16, by sputtering, a recording layer 12, an overcoat layer 13, a reflective layer 14 and a UV curable resin-containing resin are sequentially formed on a polycarbonate substrate 11 having a guide groove (not shown) having a depth of 20 nm. And the thickness of the protective layer 15 is about 5 μm, thereby preparing an optical recording medium 10 that writes once and reads many times.

[0186] Recording layer contains Bi 2 O 3 And the thickness is 10nm. The top coating contains ZnS and SiO 2 (ZnS and SiO 2 The molar ratio is 80:20) and the thickness is 17nm. The reflective layer contains Ag alloy (AgIn, in which the composition of In is about 0.5% by mass) and has a thickness of 100 nm.

[0187] Using the optical disc tester DDU-1000 manufactured by Pulstec Industrial Co., Ltd., with a wavelength of 405 nm, a numerical aperture of 0.65, and a beam diameter of about 0.55 m, the laser intensity at the center of the beam diameter is 1 / e 2 ; According to the mu...

Embodiment 2

[0194] As shown in FIG. 16, by sputtering, a recording layer 12, an overcoat layer 13, a reflective layer 14 and containing UV curing are sequentially formed on a polycarbonate substrate 11 having a depth of 21 nm guide grooves (not shown). The protective layer 15 is made of resin and has a thickness of about 5 m, thereby preparing an optical recording medium 10 that writes once and reads many times.

[0195] More specifically, using Bi 2 O 3 And a recording layer with a thickness of 10nm, a reflective layer containing an Ag alloy (AgBi, where the composition of Bi is about 0.5% by mass) and a thickness of 100nm, and a reflective layer containing ZnS and SiO 2 (ZnS and SiO 2 The molar ratio is 80:20) and the upper coating has various thicknesses to prepare an optical recording medium that can write once and read multiple times.

[0196] Using an optical disc tester DDU-1000 manufactured by Pulstec Industrial Co., Ltd., the reflectance and jitter of these optical recording media we...

Embodiment 3

[0202] As shown in FIG. 16, by sputtering, a recording layer 12, an overcoat layer 13, a reflective layer 14 and a UV curable resin-containing resin are sequentially formed on a polycarbonate substrate 11 having a guide groove (not shown) having a depth of 22 nm. And the thickness of the protective layer 15 is about 5 μm, thereby preparing an optical recording medium 10 that writes once and reads many times.

[0203] More specifically, using ZnS and SiO 2 (ZnS and SiO 2 The mol is 80:20) and the thickness is fixed to 15nm, the reflective layer containing Ag alloy (AgBi, the composition of Bi is about 0.5% by mass) and the thickness is fixed to 100nm, and the reflective layer containing Bi 2 O 3 And it has recording layers of various thicknesses to prepare optical recording media that can write once and read multiple times.

[0204]The reflectance and SDR of these optical recording media were measured using a disc tester DDU-1000 manufactured by Pulstec Industrial Co., Ltd. with a ...

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Abstract

The present invention provides a write-once-read-many optical recording medium comprising a substrate, a recording layer comprising any one of bismuth and an oxide of bismuth, an overcoat layer and a reflective layer in this order from a laser beam incident plane, wherein the write-once-read-many optical recording medium has a reflectivity of 35 % or less when a laser is applied to the flat part of the substrate or a write-once-read-many optical recording medium comprising a substrate, an undercoat layer, a recording layer comprising any one of bismuth and an oxide of bismuth, an overcoat layer and a reflective layer in this order from a laser beam incident plane, wherein the write-once-read-many optical recording medium has a reflectivity of 35 % or less when a laser is applied to the flat part of the substrate.

Description

Technical field [0001] The present invention relates to a write-once-read-many (WORM) optical recording medium, or more specifically, the present invention relates to a one-time recording medium that allows high-density recording in the wavelength region of a blue laser beam. Write to multiple read optical recording media. Background technique [0002] Research is currently underway on optical recording media that allow write-once read-many for recording at blue laser wavelengths or shorter wavelengths. [0003] Regarding the existing optical recording medium that writes once and reads multiple times, by applying a laser beam to the recording layer containing organic dyes, the refractive index changes mainly due to the decomposition or change of the organic material, thereby forming information pits (information pits). pit). Therefore, the optical constant and decomposition behavior of the organic dye used in the recording layer are important factors for forming a preferable reco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/26G11B7/24G11B7/243G11B7/254G11B7/257G11B7/24088
Inventor 藤井俊茂笹登林嘉隆三浦裕司藤原将行
Owner RICOH KK
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