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Method for producing an optical information recording medium

a technology of optical information and recording medium, which is applied in the direction of record information storage, film/foil adhesives, instruments, etc., can solve the problems of loss of production yield, unflat surface of the cover layer, uneven thickness, etc., and achieve stable recording/reproducing characteristics, low noise, and satisfactory jitter level

Inactive Publication Date: 2006-03-09
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] In consideration of the foregoing, an object of the present invention is to provide a method for producing an optical information recording medium having a satisfactory jitter level, low noises and stable recording / reproducing characteristics.
[0016] Another object of the present invention is to provide a method for producing an optical information recording medium capable, in an adhering step of adhering a surface bearing a recording layer and an adhering surface of a cover sheet with an adhesive material in manufacturing a high-capacity optical information recording medium, of preventing dust inclusion between the recording layer-bearing surface and the cover sheet, thereby preventing generation of a dropout.
[0017] Still another object of the present invention is to provide a method for producing an optical information recording medium utilizing a method for preparing a cover layer including a step of winding such cover layer into a roll, capable of providing an optical information recording medium with excellent recording characteristics and an excellent durability. Still another object of the present invention is to provide a method for producing an optical information recording medium with an excellent productivity.

Problems solved by technology

However, such adhering step is susceptible to formation of a fault portion by causing an inclusion of dust in the adhesive layer, formed by adhering the above-mentioned surface bearing the recording layer and the above-mentioned cover sheet, thus resulting in a dropout in the optical disc, namely in a loss in the production yield.
With such a method, in case the laminated film member after the continuous formation thereof is wound in a roll, the laminated film member working into the disc shape tends to show a bending by such rolling or a curl, thereby leading to a cover layer having an unflat surface or an unevenness in the thickness.
As a result, an optical information recording medium having such a cover layer is unable to achieve satisfactory recording characteristics or a satisfactory durability.

Method used

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  • Method for producing an optical information recording medium
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  • Method for producing an optical information recording medium

Examples

Experimental program
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Effect test

example 1-1

[0149] On a grooved surface of an injection molded polycarbonate substrate (polycarbonate Panlite AD5503 (trade name), manufactured by Teijin Ltd.) of a thickness of 1.1 mm and a diameter of 120 mm, having spiral grooves (track pitch: 30 nm, groove depth: 40 nm, groove width: 150 nm), Ag was sputtered under sputtering conditions of a sputtering power of 0.2 kW and an Ar flow rate of 50 cm3 / sec to form a reflective layer of a thickness of 100 nm. Then, Orazol Blue GN (trade name; manufactured by Ciba Fine Chemical Ltd.) was mixed with 2,2,3,3-tetrafluoropropanol and was subjected to an ultrasonic irradiation for 2 hours for dissolution to obtain a dye coating liquid. This dye coating liquid was spin coated with a revolution varying from 300 to 4000 rpm under conditions of 23° C. and 50% RH to obtain a recording layer. Then an annealing was conducted for 2 hours under conditions of 23° C. and 50% RH, and a UV curable adhesive (trade name SD347, manufactured by Dai-Nippon Ink and Chemi...

example 1-2

[0150] An optical information recording medium of an example 1-2 was obtained in the same manner as in the example 1-1, except that the elapsed time from immediately after the formation of the reflective layer to the start of the formation of the cover layer was selected as 6 hours, and a storage temperature and a storage humidity in such time were respectively selected as 23° C. and 50%.

example 1-3

[0151] An optical information recording medium of an example 1-3 was obtained in the same manner as in the example 1-1, except that the elapsed time from immediately after the formation of the reflective layer to the start of the formation of the cover layer was selected as 12 hours, and a storage temperature and a storage humidity in such time were respectively selected as 23° C. and 50%.

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Abstract

The invention provides a method for manufacturing an optical information recording medium having a track pitch of 200 to 400 nm and a groove depth of 20 to 150 nm, and being capable of recording and reproducing using a light with a wavelength of 450 nm or less, the method at least comprising: a metal reflective layer forming step for forming a metal reflective layer on a substrate; a recording layer forming step for forming a recording layer of an organic dye type on said metal reflective layer; and a cover layer forming step for forming a cover layer on said recording layer; in this order.

Description

[0001] This is a divisional of U.S. application Ser. No. 10 / 318,015 filed Dec. 13, 2002. The entire disclosure of U.S. application Ser. No. 10 / 318,015 is considered part of the disclosure of the accompanying divisional application and is hereby incorporated by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a method for producing an optical information recording medium of capable of add-on type recording and reproduction with a laser light of a specified wavelength. [0004] 2. Description of the Related Art [0005] An optical information recording medium (optical disc) capable of information recording only once with a laser light is already known. Such an optical disc is also called an add-on CD (CD-R), and has a representative structure including, on a transparent disc-shaped substrate, a recording layer composed of by an organic dye, a light reflecting layer formed by a metal such as gold (metal reflective layer) and fur...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B44C1/165B44C1/17C09J7/00G11B7/246G11B7/247G11B7/249G11B7/2492G11B7/253G11B7/2534G11B7/254G11B7/2542G11B7/257G11B7/258G11B7/259G11B7/26
CPCG11B7/247Y10T156/1062G11B7/2492G11B7/2534G11B7/2542G11B7/256G11B7/259G11B7/26G11B2007/24612G11B2007/25706G11B2007/2571G11B2007/25715G11B2007/25716Y10T156/1075Y10T156/1304Y10T156/1339Y10T156/13Y10T156/1085G11B7/248
Inventor KAKUTA, TAKESHIOZAWA, TAKAKOISHIDA, TOSHIOMIZUTA, AKIRA
Owner FUJIFILM CORP