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Method of recording information on an optical information recording medium

a technology of optical information and recording medium, which is applied in the field of optical information recording medium, can solve the problems of insufficient storage stability, insufficient recording characteristics, and insufficient reflectance and percentage modulation, and achieve excellent recording characteristics and high versatility.

Inactive Publication Date: 2006-05-18
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an optical information recording method and medium that can record information using a shortwave laser having a wavelength of 450 nm or less, and play back the information using the same laser or a different laser having a wavelength of 750 to 850 nm. The recording layer of the medium contains a phthalocyanine derivative that has high sensitivity to both lasers and good recording and playback characteristics. The optical information recording medium can also store information over a long period of time by designing a recording layer that is stable with respect to high temperature and high humidity. The invention solves the problems of previous optical information recording methods and media, which had limitations in recording and playback characteristics, reflectance, and percentage modulation.

Problems solved by technology

While DVD-Rs have to a certain extent secured a position as large-capacity recording media, they still do not possess a sufficiently large recording capacity to meet the demands of the future.
However, the present inventors have ascertained that further improvement is needed because, when information is recorded on the above-described conventional optical discs by irradiating the discs with a shortwave laser having a wavelength of 450 nm or less, recording characteristics, such as reflectance and percentage modulation, are not satisfactory and storage stability is insufficient.

Method used

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  • Method of recording information on an optical information recording medium
  • Method of recording information on an optical information recording medium
  • Method of recording information on an optical information recording medium

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0067] A compound (I-1) was dissolved into 2,2,3,3-tetrafluoropropanol to obtain a coating solution for forming a recording layer (concentration: 1% by weight). The coating solution was spin-coated onto the surface of a polycarbonate substrate (diameter: 120 nm; thickness: 0.6 mm) disposed with a spiral pre-groove (track pitch: 0.4 μm; groove width: 0.2 μm; groove depth: 0.08 μm) formed by injection molding, whereby the recording layer was formed (thickness (inside pre-groove): approximately 80 nm).

[0068] Next, silver was sputtered onto the recording layer to form a reflective layer having a thickness of approximately 100 nm. A UV-curable resin (SD 318 made by Dainippon Ink and Chemical Co., Ltd.) was then coated onto the reflective layer and cured by being irradiated with ultraviolet light, whereby a protective layer having a thickness of 7 μm was formed. Thus, an optical disc of the present invention was obtained.

examples 2 to 17

[0069] Optical discs of the invention were formed in the same manner as in Example 1, except that compound (1-1) was changed to compounds shown in Table 6 (amount not changed).

example 18

[0074] A compound (I-3) was dissolved into dibutyl ether to obtain a coating solution for forming a recording layer (concentration: 1% by weight). The coating solution was spin-coated onto the surface a polycarbonate substrate (diameter: 120 nm; thickness: 0.6 mm) disposed with a spiral pre-groove (track pitch: 1.0 μm; groove width: 0.4 μm; groove depth: 0.15 μm) formed by injection molding, whereby the recording layer was formed (thickness (inside pre-groove): approximately 170 nm).

[0075] Next, silver was sputtered onto the recording layer to form a reflective layer having a thickness of approximately 100 nm. A UV-curable resin (SD 318 made by Dainippon Ink and Chemical Co., Ltd.) was then coated onto the reflective layer and cured by being irradiated with ultraviolet light, whereby a protective layer having a thickness of 7 μm was formed. Thus, an optical disc of the present invention was obtained.

Evaluation 2 as an Optical Disc

[0076] A 14T-EFM signal was recorded on the optic...

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Abstract

An optical information recording medium includes a substrate having disposed thereon a recording layer that is recordable by irradiating the recording layer with a laser having a wavelength of 450 nm or less. The recording layer contains a specific phthalocyanine derivative. An optical information recording method uses the medium.

Description

[0001] This is a divisional of application Ser. No. 10 / 180,099 filed Jun. 27, 2002. The entire disclosure of the prior application, application Ser. No. 10 / 180,099 incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to an optical information recording method, in which information is recorded and played back with a laser, and to an optical information recording medium used in the method. In particular, the invention relates to a heat-mode optical information recording medium on which information is recorded by irradiating the medium with a shortwave laser having a wavelength of 450 nm or shorter, and to an optical information recording method using the medium. [0004] 2. Description of the Related Art [0005] A CD-R is a writable, optical information recording medium (optical disc) on which information can be written only once by irradiation with a laser, and has conventionally been known. A CD-R typically c...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11B7/24G11B7/248
CPCG11B7/24G11B7/248Y10S430/146
Inventor SAITO, NAOKI
Owner FUJIFILM CORP
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