JP2002358698A - Method of manufacturing optical information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture an optical information recording medium having good recording characteristics by suppressing the decomposition of the dye contained in a dye recording layer in molding a protective layer by curing a UV-curing resin and to reduce the cost by shortening the cycle time for production. SOLUTION: In manufacturing the optical information recording medium having a recording layer which is formed on a substrate, contains the dye and is capable of recording information with a laser beam, a light reflection layer which is formed on the recording layer and reflects incident light and the protective layer which is formed by curing the UV-curing resin on the light reflection layer, the protective layer is formed by curing the UV-curing resin by impulsively irradiating the resin with UV rays of 1.0 to 8.0 kW/cm<2> in the irradiation power per pulse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an optical information recording medium, and more particularly, to an optical information recording medium having a protective layer formed by curing an ultraviolet curable resin and a recording layer containing a dye. The present invention relates to a method for manufacturing an optical information recording medium to be manufactured.

[0002]

2. Description of the Related Art Conventionally, a write-once optical information recording medium (optical disk) in which information can be recorded only once by a laser beam.
Is called CD-R and is widely known. This CD-
A typical structure of an R-type optical information recording medium is such that a dye recording layer made of an organic dye, a light reflection layer made of a metal such as gold, and a protective layer made of a resin are further laminated in this order on a transparent disk-shaped substrate. Things. Recording of information on the optical disk is performed by irradiating the optical disk with near-infrared laser light (usually laser light having a wavelength of around 780 nm), and the irradiated portion of the dye recording layer absorbs the light. The temperature locally rises, and the optical characteristics of the portion change due to a physical or chemical change (for example, generation of a pit or the like), and information is recorded. On the other hand, in reproducing information, a laser beam having the same wavelength as the recording laser beam is irradiated onto the optical disc, and a portion where the optical characteristics of the dye recording layer has changed (recorded portion) and a portion where the optical characteristics have not changed (not yet recorded) This is performed by detecting a difference in reflectance with the recording portion).

Recently, a write-once optical disc called a DVD-R has been put to practical use as a medium capable of recording at a higher density than a CD-R, and is establishing a position as a large-capacity recording medium. . This DVD-R usually has a dye recording layer made of an organic dye, a light reflection layer,
And a structure in which two discs each having a protective layer laminated in this order are bonded with an adhesive with the dye recording layer on the inside, or a disc-shaped protective substrate having the same shape as the disc with the dye recording layer on the inside with an adhesive It has a laminated structure.

[0004] In the formation of the protective layer and the bonding of the disks, it is common to use an ultraviolet curable resin.
When irradiating the ultraviolet curable resin with ultraviolet rays to cure the photocurable resin simultaneously with the ultraviolet rays, the dye contained in the recording layer may be partially decomposed to deteriorate the recording characteristics. However, conventional CD-R, DVD-R
Has a structure in which a light reflecting layer is provided between the protective layer to be cured by ultraviolet light and the dye recording layer, so that most of the ultraviolet light is reflected by the light reflecting layer. For this reason, the conventional manufacturing method has not caused a problem of remarkable deterioration of the recording characteristics of the optical information recording medium.

[0005]

However, in order to shorten the manufacturing cycle time (the cycle time of the rate-limiting step in the manufacturing process), when ultraviolet light is irradiated from a high-output ultraviolet light source, the ultraviolet light is transmitted through the light reflecting layer. In this case, the amount of ultraviolet rays to be emitted increases, and the dye contained in the recording layer is decomposed to deteriorate the recording characteristics.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to prevent decomposition of a dye contained in a recording layer when a protective layer is formed by curing an ultraviolet curable resin. An object of the present invention is to provide a method for manufacturing an optical information recording medium that can manufacture an optical information recording medium having good recording characteristics, and can shorten the manufacturing cycle time to reduce the cost. .

[0007]

In order to achieve the above object, the present invention provides a recording layer formed on a substrate and containing a dye, on which information can be recorded by laser light, and a recording layer formed on the recording layer. A method for manufacturing an optical information recording medium for manufacturing an optical information recording medium including a light reflection layer that reflects incident light and a protective layer formed by curing an ultraviolet curable resin on the light reflection layer, The irradiation power per pulse is 1.0 kW / cm ^{2 to} 8.0 kW /
The method is characterized in that the protective layer is formed by curing the ultraviolet curable resin by irradiating an ultraviolet ray of cm ² with a pulse.

In the method for manufacturing an optical information recording medium of the present invention,
Irradiation power per pulse is 1.0 for UV curable resin.
and kW / cm ² ~8.0kW / cm ² was irradiated with ultraviolet light of high output, because it forms a protective layer to cure the ultraviolet curable resin, curing of the ultraviolet curable resin can be remarkably promoted. For this reason, the manufacturing cycle time can be significantly reduced, and the cost can be reduced. Also,
Since the ultraviolet curable resin is cured by irradiating the ultraviolet light with a pulse, the decomposition of the dye contained in the recording layer due to the ultraviolet light is suppressed, and an optical information recording medium having good recording characteristics can be manufactured.

In the above-described manufacturing method, it is preferable to irradiate ultraviolet rays with a pulse width of 1.0 second or less.

The recording layer is preferably formed by spin-coating a coating solution containing a dye on a substrate at a coating temperature of 23 ° C. to 50 ° C. By setting the coating temperature higher, the residual amount of the solvent in the recording layer is reduced, and the decomposition of the dye contained in the dye recording layer by ultraviolet rays is further suppressed, and an optical information recording medium having more favorable recording characteristics Can be manufactured.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment in which a method for manufacturing an optical information recording medium according to the present invention is applied to a system for manufacturing an optical disk (for example, a CD-R) having a dye recording layer. The form will be described.

The manufacturing system 10 according to the present embodiment
As shown in FIG. 1, for example, two molding equipments (first and second molding apparatuses) for producing a substrate by injection molding, compression molding or injection compression molding.
And a second molding facility 12A and 12B), a coating facility 14 for forming a dye recording layer on the substrate by applying and drying a dye coating solution on one main surface of the substrate, and a dye recording apparatus for the substrate. A light-reflecting layer is formed on the light-reflecting layer by, for example, sputtering, and after that, a UV curing liquid is applied onto the light-reflecting layer, and then UV irradiation is performed to form a protective layer on the light-reflecting layer. It is configured.

First and second molding equipment 12A and 12B
Is a molding machine 20 for injection molding, compression molding, or injection compression molding of a resin material such as polycarbonate to produce a substrate having a tracking groove or an unevenness (groove) representing information such as an address signal formed on one main surface. A cooling unit 22 for cooling the substrate taken out of the molding machine 20, and an accumulating unit 26 (stack pole turntable) on which a plurality of stack poles 24 for stacking and storing the cooled substrates are stored.
And

The coating equipment 14 has three processing units 30, 32
And 34, the first processing section 30 includes a stack pole storage section 40 for storing the stack poles 24 transported from the first and second molding facilities 12A and 12B, and a stack pole storage section 40 for storing the stack poles. A first transport mechanism 42 that takes out the substrates one by one from the stack pole 24 accommodated in the unit 40 and transports the substrates to the next process; And an electrostatic blow mechanism 44 for removing.

The second processing section 32 has a second transport mechanism 46 for sequentially transporting the substrates, which have been subjected to the electrostatic blow processing in the first processing section 30, to the next step, and transports the substrates by the second transport mechanism 46. A dye coating mechanism 48 that applies a dye coating liquid to each of the plurality of substrates, and a third transport mechanism 50 that transports the substrates that have been subjected to the dye application processing one by one to the next process. The dye application mechanism 48 includes six spin coaters 52.

The third processing section 34 cleans the back surface of one substrate transported by the third transport mechanism 50, and transports the substrate after the back surface cleaning to the next step. A fourth transport mechanism 56, a numbering mechanism 58 for marking the substrate transported by the fourth transport mechanism 56 with a lot number or the like, and transporting the substrate having been stamped with the lot number or the like to the next step. A fifth transport mechanism 60, an inspection mechanism 62 that inspects the substrate transported by the fifth transport mechanism 60 for the presence or absence of a defect, and a film thickness of the dye recording layer, and an inspection by the inspection mechanism 62. A sorting mechanism 68 for sorting the substrate into a stack pole 64 for a normal product or a stack pole 66 for a defective product (for NG) according to the result.

A first partition plate 70 is provided between the first processing unit 30 and the second processing unit 32, and the second processing unit 32 and the third processing unit 34 have the same second processing unit. A partition plate 72 is provided. An opening (not shown) is formed below the first partition plate 70 to such an extent that the transfer path of the substrate by the second transfer mechanism 46 is not blocked. An opening (not shown) is formed so as not to block the substrate transfer path by the third transfer mechanism 50.

The post-processing facility 16 includes a stack pole storage section 80 for storing a stack pole 64 for normal products transported from the coating apparatus 14, and one of the stack poles 64 stored in the stack pole storage section 80. A sixth transport mechanism 82 that takes out substrates one by one and transports them to the next process;
A first electrostatic blow mechanism 84 for removing static electricity from one substrate transported by the sixth transport mechanism 82
And a seventh transport mechanism 86 for sequentially transporting the substrate after the electrostatic blow processing to the next step, and forming a light reflecting layer on one main surface of the substrate transported by the seventh transport mechanism 86 by sputtering. Transport mechanism 90 for sequentially transporting the substrate after the sputtering of the light reflection layer to the next step, and cleaning the periphery (edge portion) of the substrate transported by the eighth transport mechanism 90 Edge cleaning mechanism 9
And 2.

The post-processing equipment 16 includes a second electrostatic blow mechanism 94 for removing static electricity from the substrate after the edge cleaning, and a second electrostatic blow mechanism 94 for removing one main surface of the substrate after the electrostatic blow processing. UV curable liquid application mechanism 96 for applying UV curable liquid
And a spin mechanism 9 for rotating the substrate on which the UV curing liquid has been applied at a high speed so as to make the applied thickness of the UV curing liquid on the substrate uniform.
8, a UV irradiation mechanism 100 for curing the UV curable liquid by irradiating the substrate with the UV curable liquid applied and spin-treated with a pulse of ultraviolet light to form a protective layer on one main surface of the substrate; The substrate is moved to the second electrostatic blow mechanism 94, U
A ninth transport mechanism 102 that transports the V-curing liquid application mechanism 96, the spin mechanism 98, and the UV irradiation mechanism 100, respectively,
A tenth transport mechanism 104 for transporting the substrate irradiated with UV to the next step, and a defect inspection mechanism 106 for inspecting the substrate transported by the tenth transport mechanism 104 for defects on the coating surface and the protective layer surface. And a characteristic inspection mechanism 108 for inspecting a signal characteristic by a groove formed in the substrate
And the defect inspection mechanism 106 and the characteristic inspection mechanism 108
And a sorting mechanism 114 that sorts the substrate into stack poles 110 for normal products or stack poles 112 for NG according to the inspection result of the above.

As shown in FIG. 1, the manufacturing system 10 is provided with an air conditioning system 300 in parallel with the second processing section 32 of the coating equipment 14. Air conditioning system 300
Although not shown, it is composed of an air conditioner, a dehumidifier, and an exhaust device. Among them, the air conditioner sends clean air to the coating equipment 14 and controls the temperature in the second processing unit 32, and the dehumidifier takes in outside air to perform dehumidification and outputs it as primary air. Also,
The exhaust device sends a part of exhaust (local exhaust) from the coating facility 14 to an upper exhaust system. Such local exhaust includes, for example, exhaust from the six spin coaters 52 in the dye application mechanism 48 of the application facility 14.

The exhaust air velocity at the time of applying the dye solution is 1 m /
s or less, preferably 0.7 m / s or less, and more preferably 0.4 m / s or less. Thereby, the application of the dye solution onto the substrate is favorably performed.

Although not shown, the first processing unit 30
The clean air is sent to the first and third processing units 30 and 34 also through the high performance packed bed filter (HEPA filter) to the ceilings of the first and third processing units 34, respectively. First and third processing units 30 and 3
An air conditioner for controlling the temperature inside 4 is installed.

Next, the process of manufacturing the optical disk D by the manufacturing system 10 will be described with reference to FIGS.
This will be described with reference to the process charts of FIGS.

First, in a molding machine 20 in the first and second molding facilities 12A and 12B, a resin material such as polycarbonate is subjected to injection molding, compression molding or injection compression molding, and as shown in FIG. A substrate 202 is formed on one principal surface of which a groove 200 for tracking or information 200 such as an address signal is formed.

Examples of the material of the substrate 202 include acrylic resins such as polycarbonate and polymetal methacrylate, vinyl chloride resins such as polyvinyl chloride and vinyl chloride copolymer, epoxy resins, amorphous polyolefin and polyester. They can be used together if desired. Among the above materials, polycarbonate is preferred from the viewpoints of moisture resistance, dimensional stability, cost, and the like. Further, the thickness of the substrate 202 is 1.2 mm for a CD-R type disc, the depth of the groove 200 is preferably in the range of 0.01 to 0.3 μm, and its half width is 0.1 mm. It is preferably in the range of 2 to 0.9 μm.

Substrate 202 taken out of molding machine 20
After being cooled in the cooling unit 22 in the subsequent stage, the wafer is stacked on the stack pole 24 with one main surface directed downward. At the stage when a predetermined number of substrates 202 are stacked on the stack pole 24, the stack pole 24 is taken out from the molding facilities 12A and 12B, and is conveyed to the next coating facility 14, where the stack pole storage section 40 in the coating facility 14 is placed.
To be housed. This transfer may be performed by a trolley or by a self-propelled automatic transfer device.

At the stage when the stack poles 24 are accommodated in the stack pole accommodating section 40, the first transport mechanism 42 is operated, and the substrates 202 are taken out one by one from the stack poles 24 and sent to the subsequent electrostatic blow mechanism 44. Transport. After the static electricity is removed by the electrostatic blow mechanism 44, the substrate 202 transported to the electrostatic blow mechanism 44 is transported to the next dye coating mechanism 48 via the second transport mechanism 46, and is subjected to six spin coatings. One of the devices 52 is supplied to one of the spin coaters 52. The substrate 202 loaded into the spin coater 52 is applied with a dye coating solution on one main surface thereof, is rotated at high speed to make the thickness of the coating solution uniform, and then subjected to a drying process. As a result, FIG.
As shown in (B), the dye recording layer 204 is formed on one main surface of the substrate 202.

As the coating solution, a dye solution in which a dye is dissolved in an appropriate solvent is used. The concentration of the dye in the coating solution is generally in the range of 0.01 to 15% by mass, preferably in the range of 0.1 to 10% by mass, and particularly preferably 0.5 to 10% by mass.
It is in the range of 5% by weight, most preferably in the range of 0.5 to 3% by weight.

The dye used in the dye recording layer 204 is not particularly limited. Examples of usable dyes include cyanine dyes, phthalocyanine dyes, imidazoquinoxaline dyes, pyrylium / thiopyrylium dyes, azurenium dyes, squalilium dyes, metal complex salt dyes such as Ni and Cr, and naphthoquinone dyes And anthraquinone dyes, indophenol dyes, indoaniline dyes, triphenylmethane dyes, merocyanine dyes, oxonol dyes, aminium / diimmonium dyes, and nitroso compounds. Among these dyes, cyanine dyes are preferable, benzoindolenine dyes are more preferable, and dyes represented by the following general formula (1) are particularly preferable.

[0030]

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R ¹ and R ^{2 in} the general formula (1) represent a monovalent substituent. R ¹ and R ² may be the same or different. As the monovalent substituent, a substituted or unsubstituted alkyl group is preferable.

The alkyl group includes 1 to 18 carbon atoms.
Is preferred, an alkyl group having 1 to 12 carbon atoms is more preferred, and an alkyl group having 1 to 4 carbon atoms is particularly preferred. The alkyl group may be linear or branched, and examples of the substituent include halogen atoms such as a fluorine atom and a chlorine atom; alkoxy groups such as a methoxy group and an ethoxy group; alkylthio groups such as a methylthio group and a methylthio group; Acyl groups; hydroxy groups; alkoxycarbonyl groups such as ethoxycarbonyl groups; alkenyl groups such as vinyl groups; and aryl groups such as phenyl groups. Among these, a substituted alkyl group containing an ether bond or an ester bond and an unsubstituted alkyl group are more preferable, and an unsubstituted alkyl group is particularly preferable.

R ^{3 in the} general formula (1) represents a monovalent substituent. As the monovalent substituent, a hydrogen atom, a carbon atom having 1 to 16
Are preferably an alkyl group, a halogen atom and an aralkyl group, more preferably a methyl group, an ethyl group and a benzyl group, and particularly preferably a methyl group.

X ^{2- in the} general formula (1) represents a divalent anion, and a divalent anion represented by the following general formula (2) is particularly preferable.

[0035]

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At least two of R ^{4 to} R ^{11 in} the general formula (2) are a sulfonato group (—SO ₃ ⁻ ), and the rest each independently represent a monovalent substituent. As the monovalent substituent,
Hydrogen atom, hydroxy group, alkyl group, halogen atom,
An aralkyl group is preferred, a hydrogen atom, a hydroxy group and an alkyl group having 8 or less carbon atoms are more preferred, and a hydrogen atom, a hydroxy group and a methyl group are particularly preferred.

Examples of the solvent of the coating agent for forming the dye recording layer 204 include esters such as butyl acetate and cellosolve acetate; ketones such as methyl ethyl ketone, cyclohexanone and methyl isobutyl ketone; dichloromethane, 1,2-dichloroethane, chloroform. Chlorinated hydrocarbons such as amides; amides such as dimethylformamide;
Hydrocarbons such as cyclohexane; tetrahydrofuran,
Ethers such as ethyl ether and dioxane; alcohols such as ethanol, n-propanol, isopropanol, n-butanol and diacetone alcohol;
Fluorinated solvents such as 2,3,3-tetrafluoro-1-propanol; ethylene glycol monomethyl ether;
Examples thereof include glycol ethers such as ethylene glycol monoethyl ether and propylene glycol monomethyl ether.

The above-mentioned solvents can be used alone or in combination of two or more as appropriate in consideration of the solubility of the dye used. Preferably, it is a fluorinated solvent such as 2,2,3,3-tetrafluoro-1-propanol. In the coating solution, an anti-fading agent or a binder may be added as desired, or various additives such as an antioxidant, a UV absorber, a plasticizer, and a lubricant may be added according to the purpose. It may be added.

Representative examples of the anti-fading agent include nitroso compounds, metal complexes, diimmonium salts and aminium salts. These examples are described in, for example, JP-A-2-300288, JP-A-3-224793, and JP-A-4-224793.
No. 146189. In this embodiment, an anti-fading agent represented by the following general formula (3) is preferable.

[0040]

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R ¹² and R ^{13 in} the general formula (3) each represent an independent hydrogen atom or a monovalent substituent. The substituent represented by R ¹² and R ¹³ is a halogen atom, or a substituent obtained by combining a carbon atom, an oxygen atom, a nitrogen atom or a sulfur atom, and specifically, an alkyl group, an alkenyl group, an aralkyl group, Aryl group, heterocyclic group, halogen atom, cyano group, nitro group, mercapto group, hydroxy group, alkoxy group, aryloxy group, alkylthio group, arylthio group, acyloxy group, amino group, alkylamino group, amide group, sulfonamide Group, sulfamoylamino group, alkoxycarbonylamino group, alkoxysulfonylamino group, ureido group, thioureido group, acyl group, alkoxycarbonyl group, carbamoyl group, alkylsulfonyl group, alkylsulfinyl group, sulfamoyl group, carboxyl group (salt ), Sulfo group (including salt) ) Can be mentioned. These may be further substituted with these substituents.

R ¹² and R ^{13 each} represent a hydrogen atom, a carbon atom of 1
To 6 alkyl groups, halogen atoms, cyano groups, 1 carbon atoms
-C6 alkoxy group, C1-6 alkylthio group,
An amide group having 1 to 6 carbon atoms, a sulfonamide group having 1 to 6 carbon atoms, an ureido group having 1 to 6 carbon atoms, an acyl group having 1 to 6 carbon atoms, an alkoxycarbonyl group having 2 to 6 carbon atoms, 1 carbon atom -6, a carbamoyl group having 1 to 6 carbon atoms, an alkylsulfonyl group having 1 to 6 carbon atoms, an alkylsulfinyl group having 1 to 6 carbon atoms are preferable, an alkyl group is more preferable, and an alkyl group having 4 or less carbon atoms is particularly preferable.

Examples of the binder include natural organic high molecular substances such as gelatin, cellulose derivatives, dextran, rosin, and rubber; and hydrocarbon resins such as polyethylene, polypropylene, polystyrene, and polyisobutylene; polyvinyl chloride; Vinylidene, polyvinyl chloride
Vinyl resins such as polyvinyl acetate copolymer, acrylic resins such as polymethyl acrylate and polymethyl methacrylate, polyvinyl alcohol, chlorinated polyethylene, epoxy resin, butyral resin, rubber derivatives, phenol
Synthetic organic polymers such as precondensates of thermosetting resins such as formaldehyde resins can be mentioned.

When a binder is used, the amount of the binder to be used is generally 20 parts by mass or less, preferably 10 parts by mass or less, more preferably 5 parts by mass, per 100 parts by mass of the dye.
Not more than parts by mass.

The thickness of the dye recording layer 204 is generally from 20 to
It is provided in the range of 500 nm, preferably in the range of 50 to 300 nm.

The solution temperature (coating temperature) when the dye solution is coated on the substrate 202 is in the range of 23 ° C. to 50 ° C. When the coating temperature is lower than 23 ° C., the residual amount of the solvent increases, and the decomposition of the dye contained in the recording layer at the time of forming the protective layer described later increases, and the recording characteristics deteriorate. On the other hand, when the application temperature is 5
If the temperature exceeds 0 ° C., drying is too early and the surface smoothness of the recording layer deteriorates. The lower limit of the coating temperature is preferably 23 ° C, more preferably 25 ° C, and further preferably 28 ° C. The upper limit of the coating temperature is preferably 40 ° C, more preferably 37 ° C.
° C.

When the dye solution is applied, the amount of dye discharged is 0.1.
It is preferably from 3 ml to 5 ml, particularly preferably from 0.5 ml to 2 ml. The humidity at the time of applying the dye solution is in a range of 25% RH to 65% RH, preferably in a range of 35% RH to 60% RH, and more preferably in a range of 45% RH to 55% RH.

An undercoat layer may be provided on the surface of the substrate on which the dye recording layer 202 is provided, for the purpose of improving flatness, improving adhesive strength, and preventing deterioration of the dye recording layer 204. .

Examples of the material of the undercoat layer include polymethyl methacrylate, acrylic acid / methacrylic acid copolymer,
Styrene / maleic anhydride copolymer, polyvinyl alcohol, N-methylol acrylamide, styrene / vinyl toluene copolymer, chlorosulfonated polyethylene,
Nitrocellulose, polyvinyl chloride, chlorinated polyolefin, polyester, polyimide, vinyl acetate-vinyl chloride copolymer, ethylene-vinyl acetate copolymer, polyethylene, polypropylene, polycarbonate and other high-molecular substances, and silane coupling agents Surface modifiers can be mentioned.

The undercoat layer is prepared by dissolving or dispersing the above substance in an appropriate solvent to prepare a coating solution, and then applying the coating solution to the surface of the substrate by using a coating method such as spin coating, dip coating, or extrusion coating. Can be formed. The thickness of the undercoat layer is generally 0.005.
-20 μm, preferably 0.01-10 μm
m.

The substrate 202 on which the dye recording layer 204 is formed
Is transferred to the next back surface cleaning mechanism 54 via the third transport mechanism 50.
And the other side of the main surface of the substrate 202 (back side)
Is washed. Thereafter, the substrate 202 is transported to the next numbering mechanism 58 via the fourth transport mechanism 56, and the substrate 2
02 is engraved with a lot number or the like on one main surface or the back surface.

Thereafter, the substrate 202 is moved to the fifth transport mechanism 6
Then, the substrate 202 is transported to the next inspection mechanism 62 through which the presence or absence of a defect in the substrate 202 and the thickness of the dye recording layer 204 are inspected. This inspection is performed by irradiating light from the back surface of the substrate 202 and performing image processing on the transmission state of the light using, for example, a CCD camera. The inspection result of the inspection mechanism 62 is sent to the next sorting mechanism 68.

The substrate 202 having undergone the above-described inspection processing is transported and sorted by the sorting mechanism 68 into a stack pole 64 for normal products or a stack pole 66 for NG based on the inspection result.

At the stage when a predetermined number of substrates 202 are stacked on the stack pole 64 for normal products, the stack pole 64 for normal products is taken out of the coating equipment 14 and transported to the next post-processing equipment 16. It is housed in the stack pole housing section 80 of the post-processing facility 16. This transfer may be performed by a trolley or by a self-propelled automatic transfer device.

At the stage when the stack poles 64 for normal products are accommodated in the stack pole accommodating section 80, the sixth transport mechanism 82 operates, and the substrates 2 are stacked one by one from the stack poles 64.
02 is taken out and transported to the first electrostatic blow mechanism 84 at the subsequent stage. After the static electricity is removed by the first electrostatic blow mechanism 84, the substrate 202 transported to the first electrostatic blow mechanism 84 is transported to the next sputtering mechanism 88 via the seventh transport mechanism 86. You. As shown in FIG. 2 (C), the light reflecting layer 208 is formed on the entire surface of one main surface of the substrate 202 excluding the peripheral portion (edge portion) 206 by sputtering.

The light reflecting layer 208 may be any reflecting film having a reflectance of 70% or more. As the light-reflective substance that is the material of the light-reflective layer 208, a substance having a high reflectance with respect to laser light is used, and examples thereof include Mg, Se,
Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo,
W, Mn, Re, Fe, Co, Ni, Ru, Rh, P
d, Ir, Pt, Cu, Ag, Au, Zn, Cd, A
1, Ga, In, Si, Ge, Te, Pb, Po, S
Metals such as n and Bi and semimetals or stainless steel can be mentioned.

Of these, preferred are Cr, N
i, Pt, Cu, Ag, Au, Al and stainless steel. These substances may be used alone or in combination of two or more. Alternatively, it may be used as an alloy. Particularly preferred are Au, Ag, and alloys thereof.

The light reflecting layer 208 can be formed on the recording layer by, for example, vapor deposition, sputtering or ion plating of the light reflecting substance.
The thickness of the reflective layer is generally in the range of 10 to 800 nm,
Preferably in the range of 20 to 500 nm, more preferably 5
It is provided in the range of 0 to 300 nm.

The substrate 202 on which the light reflecting layer 208 is formed
Is transferred to the next edge cleaning mechanism 9 via the eighth transport mechanism 90.
Then, as shown in FIG. 3A, the edge portion 206 in one main surface of the substrate 202 is cleaned, and the dye recording layer 204 formed on the edge portion 206 is removed. Thereafter, the substrate 202 is transported to the next second electrostatic blow mechanism 94 via the ninth transport mechanism 102, and the static electricity is removed.

Thereafter, the substrate 202 is transported to the UV curable liquid application mechanism 96 via the ninth transport mechanism 102, and the UV curable liquid is dropped on a part of one main surface of the substrate 202. Thereafter, the substrate 202 is also transported to the next spin mechanism 98 via the ninth transport mechanism 102 and rotated at a high speed, so that the applied thickness of the UV curing liquid dropped on the substrate 202 is reduced over the entire surface of the substrate. Is made uniform.

After that, the substrate 202 is similarly conveyed to the next UV irradiation mechanism 100 via the ninth conveyance mechanism 102, and the UV curable liquid applied film on the substrate 202 is pulse-irradiated with ultraviolet rays. As a result, as shown in FIG. 3B, a protective layer 210 made of a UV curable resin is formed so as to cover the dye recording layer 204 and the light reflecting layer 208 formed on one main surface of the substrate 202, and the optical disk D Will be configured as

The irradiation power per pulse is set to significantly accelerate the curing and shorten the production cycle time.
1.0 kW / cm ² or more. The irradiation power per pulse is preferably 2.0 kW / cm ² or more. The irradiation power per pulse is set to 8.0 kW / cm ² or less in order to suppress the decomposition of the dye. The irradiation power per pulse is preferably 6 kW / cm ² or less, and 4 kW / c.
m ² or less is more preferable.

The pulse width for irradiating ultraviolet rays is preferably 1.0 second or less in order to prevent the destruction of the dye due to heat.
0.6 seconds or less is more preferable. Further, the pulse width is preferably at least 0.01 second, more preferably at least 0.05 second, for promoting the curing.

The number of pulse irradiations is determined according to the irradiation power per pulse, but is preferably divided into two or more times, more preferably four or more times. on the other hand,
In order to shorten the manufacturing cycle time, the number of pulse irradiations is preferably 20 times or less, more preferably 10 times or less.

As described above, the UV curable resin is used as it is or dissolved in an appropriate solvent to prepare a coating solution, and then the coating solution is applied, and the protective layer 210 is cured by irradiating UV light. Can be formed. These coating solutions further contain an antistatic agent, antioxidant, UV
Various additives such as an absorbent may be added according to the purpose.
The thickness of the protective layer 210 is generally provided in the range of 0.1 to 100 μm.

Thereafter, the optical disk D is transported to the next defect inspection mechanism 106 and characteristic inspection mechanism 108 via the tenth transport mechanism 104, where the surface of the dye recording layer 204 and the protective layer 2
10, the presence or absence of a defect on the surface of the optical disc D
The signal characteristics of the groove 200 formed in the second groove 2 are inspected. These inspections are performed by irradiating light to both sides of the optical disc D and subjecting the reflected light to image processing by, for example, a CCD camera. The inspection results of the defect inspection mechanism 106 and the characteristic inspection mechanism 108 are sent to the next selection mechanism 114.

The optical disc D that has been subjected to the above-described defect inspection processing and characteristic inspection processing is subjected to a sorting mechanism 1 based on each inspection result.
Depending on 14, stack pole 110 for normal product or NG
Is sorted by the stack pole 112 for use. When a predetermined number of optical discs D are loaded on the stack pole 110 for normal products, the stack pole 110 is taken out of the post-processing equipment 16 and put into a label printing process (not shown).

[0068]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples. (Example 1) Polycarbonate substrate (outer diameter: 120 m)
m, inner diameter: 15 mm, thickness: 1.2 mm, Teijin Limited
(Trade name: Panlite AD5503) on the surface of a spiral groove (track pitch:
1.6 μm, groove groove width: 0.4 μm, groove groove depth: 160 nm).

Next, the following compound A (indolenine dye)
2.65 g and the following compound 1 (anti-fading agent) 0.53
g, 2,2,3,3-tetrafluoropropanol 1
The solution was dissolved in 00 ml using an ultrasonic vibrator for 2 hours to prepare a coating solution for forming a recording layer. On the surface of the polycarbonate substrate on the pregroove side, 0.5 ml of a coating solution heated to 26 ° C. was dispensed at 300 rpm,
The coating was performed by spin coating while changing the rotation speed from 300 rpm to 4000 rpm, and dried to form a dye recording layer. Then, it preserve | saved for 1 hour-4 hours under the environment of 23 degreeC 50% RH. The thickness of the formed dye recording layer in the groove was 200 nm, and the thickness in the land was 120 nm.

[0070]

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Next, on the dye recording layer, Ag was sputtered to form a light reflecting layer having a thickness of 150 nm. Further, on the light reflecting layer, a UV curable resin (trade name: SD-220, manufactured by Dainippon Ink and Chemicals, Inc.) was used at a rotation speed of 300 rpm to 4 rpm.
The coating was performed by spin coating while changing to 000 rpm. After the application, a pulse type UV irradiation lamp (Xenon Co., Ltd., trade name "CoolCu
reXL-DVD ”), the irradiation power per pulse was 4.0 kW / cm ² , and the coating film was cured by irradiating it in five times with a pulse width of 0.2 seconds to cure the coating film. A 7 μm protective layer was formed. The cycle time of the UV curing process is 2.5 seconds, and the cycle time of production is 5.
0 seconds. The coating film was cured under a nitrogen atmosphere having a concentration of 90% or more.

Through the above steps, a CD-R type optical information recording medium (CD-R type optical disk) according to the present invention, comprising a substrate, a dye recording layer, a light reflecting layer, and a protective layer, was produced.

(Examples 2 to 5) Table 1 shows pulse irradiation conditions when forming the protective layer and coating temperatures when forming the dye recording layer.
A CD-R type optical disk according to the present invention was produced in the same manner as in Example 1 except that the optical disk was changed as shown in FIG. Table 1 also shows the cycle time of the UV curing step and the cycle time of the production in each example.

[0074]

[Table 1]

(Comparative Example 1) After a UV curable resin was applied by spin coating, an irradiation power of 4 kW was applied thereto using a UV-curable mercury lamp (trade name “H04-L41” manufactured by Iwasaki Electric Co., Ltd.). A CD-R type optical disc of a comparative example was produced in the same manner as in Example 1, except that a protective layer was formed by irradiating an ultraviolet ray of / cm ² for 3 seconds to cure the coating film. The cycle time of the UV curing step of Comparative Example 1 is 8.
0 seconds, and the manufacturing cycle time is 8.0 seconds.

(Comparative Example 2) The coating temperature at the time of forming the dye recording layer was set at 26 ° C, and a pulsed UV irradiation lamp (xenon (X
ENON), brand name "CoolCureXL-DV"
D)), the irradiation power per pulse is 0.9 k.
An ultraviolet pulse of W / cm ² is applied at a pulse width of 0.2 seconds for 16 seconds.
A CD-R type optical disc of a comparative example was produced in the same manner as in Example 1, except that the coating film was cured by irradiation in different times to form a protective layer. The cycle time of the UV curing step of Comparative Example 2 was 8.0 seconds, and the cycle time of the production was 8.0 seconds.

Comparative Example 3 A coating temperature at the time of forming a dye recording layer was set at 35 ° C., and a pulsed UV irradiation lamp (xenon (X
ENON), brand name "CoolCureXL-DV"
D "), the irradiation power per pulse is 8.2 k.
A CD-R type optical disc of a comparative example was prepared in the same manner as in Example 1 except that an ultraviolet pulse of W / cm ² was irradiated once with a pulse width of 0.2 second to cure the coating film and form a protective layer. Was prepared. The cycle time of the UV curing step of Comparative Example 3 was 0.5 seconds, and the cycle time of the production was 3.5 seconds.

[Evaluation as Optical Disk] The above-mentioned CD-R type optical disk according to the present invention was evaluated by an evaluation machine “OMT
2000 "(manufactured by Pulstec), and the recording characteristics were evaluated at an optimum power at a recording wavelength of 780 nm.
The power margin at that time was examined. The power margin is a range of β values in which the value of BLER (block error rate) does not exceed 220. The wider the power margin is, the less the dye is decomposed, the higher the sensitivity, and the better the recording characteristics. A power margin of 30 or more is required. Table 1 shows the results.

From the results shown in Table 1, irradiation per pulse
Power is 1.0 to 8.0 kW / cm ^TwoEven if big, purple
Irradiation of an external line with a pulse makes the protective layer made of UV-curable resin
When formed (Examples 1 to 5), the power margin is
Wide range of 30 or more, optical disk has high sensitivity and good recording characteristics
It turns out that it is. In particular, raise the application temperature of the dye solution
(Example 2), the power margin is as wide as 40.
In addition, it can be seen that the sensitivity of the optical disk is improved. on the other hand,
4 kW / cm^TwoUV-cured tree by irradiating with UV light for 3 seconds
When a protective layer made of fat was formed (Comparative Example 1),
The work margin is as narrow as 20, and the sensitivity of the optical disc decreases.
You can see that it is. In addition, irradiation power per pulse
Is 1.0 kW / cm^TwoIf less than (Comparative Example 2)
Irradiation must be performed 16 times in order to
It is not possible to shorten the runtime. Irradiation power per pulse
Is 8.0 kW / cm^Two(Comparative Example 3)
Can be cured by irradiation, but has a narrow power margin of 22
It can be seen that the sensitivity has decreased. This drop in sensitivity
Is presumed to be caused by the decomposition of the dye in the recording layer.

[0080]

The method for manufacturing an optical information recording medium according to the present invention comprises:
When curing the ultraviolet curable resin to form the protective layer, by suppressing the decomposition of the dye contained in the dye recording layer, it is possible to produce an optical information recording medium having good recording characteristics, This has the effect of shortening the manufacturing cycle time and reducing costs.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an example of a manufacturing system according to an embodiment.

2A is a process diagram showing a state in which a groove is formed on a substrate, FIG. 2B is a process diagram showing a state in which a dye recording layer is formed on the substrate, and FIG. It is a process figure showing the state where the light reflection layer was formed.

FIG. 3A is a process diagram showing a state where an edge portion of the substrate is cleaned, and FIG. 3B is a process diagram showing a state where a protective layer is formed on the substrate.

DESCRIPTION OF SYMBOLS 10 Stack manufacturing system 14 Coating equipment 16 Post-processing equipment 24, 64, 66, 110, and 112 Stack pole 30 First processing unit 32 Second processing unit 34 Third processing unit 48 Dye coating mechanism 52 Spin coating device 62 Inspection mechanism 68 Sorting mechanism 88 Sputtering mechanism 100 UV irradiation mechanism 202 Substrate 204 Dye recording layer 208 Light reflection layer 210 Protective layer D Optical disk

Claims (3)

[Claims] 1. A recording layer formed on a substrate and capable of recording information with a laser beam by containing a dye, a light reflecting layer formed on the recording layer and reflecting incident light, and the light reflecting layer In a method for manufacturing an optical information recording medium having a protective layer formed by curing an ultraviolet-curable resin thereon, an irradiation power per pulse of the ultraviolet-curable resin is 1.0 kW. A method for producing an optical information recording medium, comprising: irradiating a pulse of ultraviolet light having a wavelength of from about / cm ^{2 to} 8.0 kW / cm ² to cure the ultraviolet-curable resin to form the protective layer. 2. The method for manufacturing an optical information recording medium according to claim 1, wherein the ultraviolet light is pulse-irradiated with a pulse width of 1.0 second or less. 3. The recording layer is heated at 23 ° C.
3. The method for producing an optical information recording medium according to claim 1, wherein the optical information recording medium is formed by spin coating on a substrate at a coating temperature of about 50 [deg.] C.