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Write-once-read-many optical recording medium

An optical recording medium, multiple reading technology, applied to optical record carriers, optical recording/reproducing, data recording, etc., can solve problems such as the applicability of optical recording medium is not mentioned

Inactive Publication Date: 2010-01-06
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

[0186] Such as Figure 16 As shown, by sputtering, a recording layer 12, an overcoat layer 13, a reflective layer 14, and a UV-curable resin-containing resin were sequentially formed on a polycarbonate substrate 11 having a guide groove (not shown) with a depth of 20 nm to a thickness of The protective layer 15 is about 5 μm, so as to prepare the write-once-read-many optical recording medium 10 .

[0187] The recording layer contains Bi 2 o 3 And the thickness is 10nm. Top coat contains ZnS and SiO 2 (ZnS and SiO 2 The molar ratio is 80:20) and the thickness is 17nm. The reflective layer contained an Ag alloy (AgIn in which the composition of In was about 0.5% by mass) and had a thickness of 100 nm.

[0188] Using a disc detector 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, using a laser intensity at the center of the beam diameter of 1 / e 2 ; According to the multi-...

Embodiment 2

[0195] Such as Figure 16 As shown, by sputtering, a recording layer 12, an overcoat layer 13, a reflective layer 14, and a UV-curable resin with a thickness of The protective layer 15 is about 5m long, so as to prepare the write-once-read-many optical recording medium 10 .

[0196] More specifically, using Bi 2 o 3 and a recording layer having a thickness of 10 nm, a reflective layer containing an Ag alloy (AgBi, wherein the composition of Bi is about 0.5% by mass) having a thickness of 100 nm, and containing ZnS and SiO 2 (ZnS and SiO 2 The molar ratio is 80:20) and the overcoat layer with various thicknesses is used to prepare a write-once-read-many optical recording medium.

[0197] The reflectance and jitter of these optical recording media were measured using a disc tester DDU-1000 manufactured by Pulstec Industrial Co., Ltd. at a wavelength of 405 nm and a numerical aperture of 0.65.

[0198] Such as Figure 17 As shown, suitable SDRs are observed when the thickne...

Embodiment 3

[0203] Such as Figure 16 As shown, by sputtering, a recording layer 12, an overcoat layer 13, a reflective layer 14, and a UV-curable resin are sequentially formed on a polycarbonate substrate 11 having a guide groove (not shown) with a depth of 22 nm and a thickness of The protective layer 15 is about 5 μm, so as to prepare the write-once-read-many optical recording medium 10 .

[0204] More specifically, using ZnS and SiO 2 (ZnS and SiO 2 The molar ratio of 80:20) and the upper coating layer with a fixed thickness of 15 nm, the reflective layer containing an Ag alloy (AgBi, wherein the composition of Bi is about 0.5% by mass) and a fixed thickness of 100 nm, and the layer containing Bi 2 o 3 And it has recording layers of various thicknesses to prepare an optical recording medium for writing once and reading many times.

[0205] The reflectance and SDR of these optical recording media were measured with a disc tester DDU-1000 manufactured by Pulstec Industrial Co., Ltd....

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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 write-once-read-many (WORM) optical recording media, or more specifically, to one-time Write to optical recording media that is read many times. Background technique [0002] Research on a write-once-read-many optical recording medium that allows recording at a blue laser wavelength or shorter is currently underway. [0003] With respect to the existing write-once-read-many optical recording medium, by applying a laser beam to a recording layer containing an organic dye, a change in the refractive index is caused mainly due to decomposition or change of the organic material, thereby forming information pits. pit). Therefore, the optical constant and decomposition behavior of the organic dye used in the recording layer are important factors for forming preferable recording pits. [0004] Therefore, in order to realize a write-once-read-many optical recording medium based on a blue laser beam, it is necessary to select...

Claims

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Application Information

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Patent Type & Authority Patents(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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