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Recording/reproducing method in read-only holographic recording medium, and read-only holographic recording medium

A holographic recording medium and recording technology, applied in optical recording/reproducing/erasing methods, recording information storage, recording/reproducing/erasing using optical interference patterns, etc. The effect of increased multiplicity, high S/N and high transmission rate, and simple medium structure

Inactive Publication Date: 2011-06-15
NIPPON STEEL CHEM & MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the transmission type medium, whether it is a transmission type hologram or a reflection type hologram, it is necessary to have a recording and reproduction optical system in both directions on the surface of the medium, so the recording and reproduction device will become larger.

Method used

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  • Recording/reproducing method in read-only holographic recording medium, and read-only holographic recording medium
  • Recording/reproducing method in read-only holographic recording medium, and read-only holographic recording medium
  • Recording/reproducing method in read-only holographic recording medium, and read-only holographic recording medium

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0109] As a material for the above-mentioned hologram recording medium, a photopolymer composition having the following composition was prepared in a nitrogen atmosphere.

[0110] Hexamethylene diisocyanate (manufactured by Tokyo Chemical Industry Co., Ltd.) (refractive index n D =1.453) 30.8 parts by weight; polyoxypropylene triol (polyether triol, manufactured by (Co., Ltd.) ADEKA, G-400, average molecular weight 409) (refractive index n D =1.469) 48.1 parts by weight; acrylic acid derivatives of 9,9'-bis(4-hydroxyphenyl)fluorene diglycidyl ether (9 , 9-Bis(4-hydroxyphenyl)fluorine containing acrylic acid, manufactured by Nippon Steel Chemical Co., Ltd., ASF-400) (refractive index n D = 1.616) 4.0 parts by weight; dibutyltin dilaurate (manufactured by Shukyo Chemical Industry Co., Ltd.) 0.03 parts by weight; bis(η5-2,4-cyclopentadiene-l-y1)-bis(2,6 -Difluoro-3-(1H-pyrrole-1-yl)-phenyl)titanium (bis(η5-2,4-cyclopentadien-l-y1)-bis(2,6-difluoro-3-(1H-pyrol -1-yl)–phenyl)tit...

experiment example 2

[0126] The material of the hologram recording medium was prepared in the same manner as in Experimental Example 1. Next, the photopolymer composition is placed under a nitrogen atmosphere at a refractive index n D About 1.523 0.5 mm thick glass substrates (B270) were injected so as to have a thickness of 700 μm, and after standing overnight, they were heat-treated at 60° C. for 5 hours to obtain a hologram recording medium.

[0127] Next, on the back surface of the glass substrate with a thickness of 0.2 mm, a black adhesive tape was attached for the purpose of anti-reflection so as not to allow air bubbles to enter. At this time, when light with a wavelength of 532 nm was incident from the recording material side, the reflectance at the interface between the glass substrate and the adhesive tape was about 1%. In addition, since the above-mentioned adhesive tape is attached for the purpose of preventing reflection, the same effect can be obtained by applying a light-absorbing...

experiment example 3

[0132] The material of the holographic recording medium was prepared in the same manner as in Experimental Example 1-1. Next, the photopolymer composition, under nitrogen atmosphere, at the refractive index n D 1.487 and a thickness of 0.5mm and 0.2mm glass substrates (OHARA S-FSL5) were injected so as to have a thickness of 700 μm, and after standing overnight, heat treatment at 60° C. for 5 hours to obtain a holographic recording medium. At this time, the substrate was installed so that the antireflection film faced outward. At this time, when light with a wavelength of 532 nm was incident from the recording material side, the reflectance on the outer surface (surface on which the antireflection film was formed) of the 0.2 mm glass substrate was about 0.5%.

[0133] Next, in the same manner as in Experimental Example 1, 520 multiple recordings were performed. At this time, hologram recording was performed by making recording light incident from the side of the 0.5 mm thick...

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Abstract

A recording signal beam and a recording reference beam are applied on a first surface of a holographic recording medium, information as an interference pattern is recorded in the holographic recording medium, and a reflecting layer is adhered on a second surface which faces the first surface in the holographic recording medium. Then, a reproduction reference beam is applied on the first surface of the holographic recoding medium and is reflected by the reflecting layer, and a reproduction signal beam from the holographic recording medium is read out on the side of the first surface of the holographic recording medium.

Description

technical field [0001] The present invention relates to a recording and reproducing method of a read-only holographic recording medium for recording and reproducing information by using holography, and the read-only holographic recording medium. Background technique [0002] Recording to the hologram recording medium is performed by irradiating the recording layer with signal light and reference light with image information, and recording information on the recording medium as interference fringes. Reproduction from the holographic recording medium is performed by irradiating the recording layer on which the image information is recorded with reference light to read the image information. [0003] Since holographic recording uses the above-mentioned image information as one page (page), it can be recorded and reproduced in page units in batches, and multiple pages can be recorded in the same place on the medium, so it is expected to replace existing CDs and DVDs. , A high-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/22G11B7/0065G11B7/24G11B7/24024G11B7/24044
CPCG03H1/02G11B7/00772G11B7/26G11B7/0065G11B7/24024G11B7/245G03H1/0256G11B7/24044G03H2250/42G11B7/08564G03H1/22
Inventor 安藤敏男清水健博正木一嘉
Owner NIPPON STEEL CHEM & MATERIAL CO LTD
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