JPH02134745A - Production of information recording medium - Google Patents

Abstract

PURPOSE:To shorten the time required for processing and to improve workability by transferring and forming plural track guide grooves and/or information into one sheet and making operations with the plural sheets in the subsequent stages for forming recording layers and forming protective layers. CONSTITUTION:Substrates 1 having recording layer patterns 2 are placed on a transporting belt 7 and are passed between a gravure roll 5 and transporting rolls 8. Ink 4 dissolved with a recording material is transferred by the roll 5 onto the patterns 2 on the substrate 1 at this time. The belt is thereafter passed through a drying oven 9 to dry the ink 4. A protective member 11 is then superposed via an adhesive agent 10 on the substrates formed with the recording layers 4 and is press-welded by a press machine to form the protective layers on the substrates 1. The sheet with the protective layers obtd. in such a manner is cut. The desired information recording medium is thus obtd.

Description

Detailed Description of the Invention (Field of application after graduation) The present invention relates to a method for manufacturing information recording media such as optical disks and optical cards, and in particular relates to a method for adding L of a molded substrate. It is something.

(Prior art) Conventionally, manufacturing of optical recording media such as optical discs and optical carts has been carried out using plastic deck materials, J, II, molding to transfer track guide grooves and information to plates, etc. - L rods, recording layers. Formation 1
In addition to the 1 culm, spacer, and 6 layers of fixed layers, there are other functional layers such as installation, cleaning, and drying.

Methods for molding the V rod of the substrate include the injection method, the combination method, and the method using ultraviolet ray conversion resin.
Two methods have been devised, studied, and implemented. In this process, the injector method generally produces several sheets of lrL, and other manufacturing methods often produce medium to several sheets considering the post-process.

This is because when installing the recording layer, spin coating is often used in solvent coating 1R, and the protective layer and adhesive layer are also installed at an early stage due to alignment issues. ■This is because it was often made into several leaves.

[Invention or problem to be solved]

However, the processing step (3) using RP-several sheets increases the time required for the process and is not suitable for a manufacturing method that requires low cost and one-to-one workability.

For example, when a spin cord is used to form a recording layer by solvent coating, coating is performed one by one by rotational movement. For this reason, there was a limit to the reduction in required time. In addition, although it is common to use a material with the same size and similar shape as the substrate to form the protective layer, it is necessary to process the material into the required shape, size, and thickness and align it one by one. there were.

Further, similar problems remain with respect to each functional layer and adhesive layer.

[Means to solve the problem]

The present invention has been made in view of the above-mentioned problems, and includes transfer molding of a plurality of track guide grooves and/or information for an information recording medium onto a single sheet, and at least the subsequent formation of a recording layer and the formation of a protective layer. By performing the forming process using multiple sheets, the process time is shortened and work efficiency is improved.
This is a method of manufacturing an information recording medium that leads to cost reduction.

Hereinafter, the present invention will be explained in detail using the drawings.

1 and 2 show substrates on which grooves have been formed for a plurality of pieces, which can be used in an embodiment of the manufacturing method of the present invention. Second
The figure shows one for optical cards.

In the figure, 1 is a substrate, 2 is a recording layer pattern, and 3 is a positioning mark.The recording layer pattern 2 is formed on the substrate 1 by the following method. Further, if a positioning mark is carved on the stub bar at this time, the positioning mark 3 is also transferred at the same time.

The molding method may be an injection method, a combination method, a 2P method, or an embossing method, and any method may be used. In the case of injection method,
The molded substrates may be bonded one by one with a thin sheet-like material from the back side. In the case of the combination method, a plurality of molds may be used to mold a plurality of molds at the same time, or one mold may be molded one by one. In the case of the 2P method or the casting method using a mold, a plurality of molds may be used, or each mold may be molded one by one, or molded materials may be lined up one by one and bonded together from the back with a thin sheet. The same applies to the embossing and cutting method.

Although there are some differences in the material of the substrate depending on the molding method and the information medium, it is preferably transparent. Examples include acrylic resins, polyester resins, polycarbonate resins, polysulfone resins, vinyl; f-resins, polyimide resins, polyacetal resins, polyolefin resins, polyamide resins, cellulose derivatives, etc.; Opaque plastic may also be used.

FIG. 3 shows an embodiment of the present invention, and shows the process of forming a recording layer by solvent coating among the methods of forming a recording layer on the substrate 1. In FIG. The substrate 1 is placed on a conveyor belt 7 and passed between a gravure roll 5 and a conveyor roll 8 of a gravure coater. At this time, the ink 4 which has dissolved the recording material accumulated on the blade 6 is transferred onto the recording layer pattern 2 of the substrate 1 by the gravure roll 5. Thereafter, the ink 4 is dried by passing through a drying oven 9 using a conveyor belt. Here, the ink is preferably an ink that can form an organic thin film whose optical properties can be changed by an energy beam, and can be applied continuously using a solution or a dispersion system. Examples of recording materials include anthraquinone derivatives (having an indathrene skeleton), dioxazine compounds and their derivatives, triphuedithiazine compounds, phenanthrene conductors, cyanine compounds, merocyanine compounds, pyrylium compounds, xanthine compounds, and triphenylmethane. croconium-based compounds, croconium-based dyes, azo-based compounds, croconium-based compounds, azines, indigoids, polymethine-based dyes,
Examples include complexes with azulenes, squalium derivatives, sulfur dyes, and metal dithiolate complexes.

Although gravure coating is given as an example of the application port, other coatings include dip coating, spray coating, bar code, roll coating, blade coating, knife coating, curtain coating, etc.

Also, although not shown in the drawings, a vacuum film forming technique may be used as a method for forming the recording layer on the substrate 1. In this case Te
, oxides of metals such as Sb, Mo, Ge, V, Sn, Te
Compounds such as Sn, Te0x-Ge, Te-CH4, T
e-C57Te-Styrene:/, 5n-3O2, Ge5-
5n.

Examples include composites of metals such as 5n-3 and organic compounds or inorganic sulfides, pigments, chalcogen compounds, and the like.

FIGS. 4 and 5 show an example of the protective layer installation process. FIG. 4 shows a state in which the adhesive 10 is applied to the recording layer 4 formed on the substrate 1. As shown in FIG. A protective layer is formed on the substrate 1 by pressing with a press 12.

At that time, if beads having a particle size of 300 to 800 scales are mixed into the adhesive, there is no need to take the trouble to install a spacer. Various adhesives can be used, but the recording layer,
It is fine as long as it does not deteriorate the medium consisting of the substrate, protective layer, etc., and if energy, such as heat, light, or electron beam, is required for bonding, the energy should not deteriorate the function of the information recording medium. It's fine if you don't have it.

FIG. 6 shows another example of installing the protective layer 11, and if the spacer cannot be sunk, a hot melt adhesive sheet 13 is sandwiched between the plate 1 and the protective member 11. The protective layer may be applied by laminating the film by passing it between the laminator rolls 14 and 15.

Examples of the adhesive 10 include acid-resistant vinyl, vinyl acetate-acrylic, vinyl acetate copolymer, vinyl acetate emulsion, acrylic, modified acrylic, acrylate, acrylic jj:ii combination, ethylene, and ethylene-acetic acid. Vinyl type, edylene-hinyl coroacide IJ yen type, polyethylene, methylene chloride type, polyamide type, polyamideimide type, polyimide type, urea type, epoxy type, epoxy-urethane type, epoxy acrylate type, pot-melt type urethane-acrylate type type, polynisder type, chlorobrene type, chloroprene rubber type, nitrile type, nitrile rubber type, urethane type, hinyl-urethane type,
Polyurethane-based, olefin-based, SBR-based (styrene-based)
butadiene rubber), polyol-based, silica/alumina-based, synthetic rubber-based, emulsion-based, oligoester-based, cellulose-based, formaldehyde-based, ultraviolet curing type, styrene-butadiene-freon TA-fi, organic solvent, silicone-based, modified silicone-based , butyl rubber, etc.

As the protective member 11, any material used for the J1c board 1 can be used, and in the case of a transmission type information recording medium, a transparent material is particularly preferable. Specifically, polyvinyl chloride, fluorine-substituted ethylene polymer, vinyl chloride-vinyl acetate copolymer,
Acrylic polymers such as polyvinylidene chloride and polymethyl methacrylate, polystyrene, polyvinyl butyral, acetyl cellulose, styrene-butadiene copolymer, polyethylene, polypropylene, polycarbonate, and epoxy acrylonitrile-butadiene-styrene copolymer are used. In some cases, iron, stainless steel,
A wide variety of materials can be used depending on the application, such as metal sheets such as aluminum, tin, copper, and zinc, synthetic paper, paper, 1A fiber-reinforced plastic deck, composite materials of metal powder such as magnetic material and plastic, and ceramics. It is.

By cutting the sheet with a protective layer produced in this way using a racer cutting method, a punching method, etc., an information recording medium for L1 is produced.

〔Example〕

Hereinafter, the present invention will be specifically explained using six practical examples.

Ability d outside 1 Polymethyl methacrylate (PMM) with a thickness of 1.2 mm
Transfer the pattern for the optical disk onto A) using the 2P method,
A sheet with 6 patterns as shown in FIG. 1 was laid out and laid out. A recording layer was formed on the substrate 1- through the coating and drying process shown in FIG. As the ink, a solution in which 1-1 In-820 manufactured by Honkayaku Co., Ltd. was dissolved in diacet alcohol to a concentration of 3 wL% was used. As shown in FIG. 4, an adhesive premixed with beads having a diameter of 300 to 800 μm was applied onto the substrate on which the recording layer was formed in this manner. The adhesive is epoxy and has a viscosity of 3.0.
OOcps ultraviolet curing type ionic polymerization type was used.

As shown in FIG. 51, 1.1 mm thick PMMA was pressed onto this using a press, and the adhesive was cured by irradiating it with ultraviolet rays for 2 minutes. The sheet with the protective layer thus produced was cut by a laser cutting method to obtain a WO (write once) type optical disc. G of this optical disc
/N sensitivity is 53.0d when measured with recording laser power 8.0mW, recording frequency 3.0M1lz, rotation speed +800rpm, and reproduction laser power 0.6mW.
It was B. This value was almost the same as that of an optical disk manufactured using a single sheet.

As shown in FIG. 2, a recording layer was formed in the same manner as in Example 1 on a polycarbonate substrate having a thickness of 0.4 m+n onto which six patterns of an optical card were transferred by compression molding. Then, as shown in Figure 6, a hot melt adhesive sheet (ethylene-vinyl acetate copolymer) was applied to
Sandwiched between the mm polycarbonate sheet and the substrate,
Lamination was carried out at a roll temperature of 110° C. and a feed rate of 1 m/s. Cut this pasted sheet with a punch,
I got a light card. The recording/reproducing contrast of this optical card is as follows: recording laser power: 4.0 mW (feeding speed: 60 mW)
mm/sec), laser oscillation pulse width 200μ, and reproduction power 0.4mW (feed speed 400mm 7 seconds), the value of 0.64 was 1! It was. This value was almost the same as that of the optical card manufactured with a single leaf. The recording/reproducing contrast referred to here is defined as: Recording/reproducing contrast=(reflectance of unrecorded area).

(Effects of the Invention) According to the present invention, the time required for the step of forming a recording layer of an information recording medium can be shortened, workability is further improved, and the purpose of cost reduction has been achieved.

In addition, since the recording layer is formed by a coating process using an organic solvent using a method such as gravure coating, ink circulation becomes easier and the amount of ink used can be reduced compared to the spinner method, making it more economical. be.

4. I7i'1qt- Explanation of the Drawings FIGS. 1 and 2 show a substrate for an information recording medium that can be used in the present invention, and FIG. 3 shows a recording layer forming process using the substrate.
FIGS. 4 to 6 are schematic diagrams of the protective layer installation process.

! ...Substrate 2...Recording layer pattern 3...
...Positioning mark 4...In 5...Gravure roll 6...Blade 7...Transport belt
8... Conveyance roller 9... Drying oven 10... Adhesive 11... Protective member! 2...Press machine 13...
・Hot melt type adhesive sheet 14.15... Laminating roller Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In the manufacturing process of an information recording medium, a plurality of track guide grooves and/or information for the information recording medium are transfer-molded onto one sheet, and at least the subsequent recording layer formation and protective layer formation are performed. 1. A method for manufacturing an information recording medium, characterized in that the forming step is carried out using multiple sheets. 2. The manufacturing method according to claim 1, which includes the step of forming the recording layer as a thin film mainly composed of an organic material by coating with a solvent.