JPH03235233A - Manufacture of roll die to form substrate for information recording medium and manufacture of substrate for information recording medium using this roll die - Google Patents

Abstract

PURPOSE:To manufacture a forming roll die for a substrate of information recording medium and to manufacture a substrate using this roll by applying a liquid resin on an original plate having a grooved pattern of preformat to form a resin layer and then fixing the resin layer on the surface of the roll body. CONSTITUTION:A resin layer 2 is formed to a certain thickness on an original plate or stamper 1 having a grooved pattern 3, then hardened and transferred to the surface of a roller 4 to be fixed thereon. In this process, the resin layer 2 is fixed to the roller 4 with the rugged pattern face outside. The resin layer 2 is preferably to have certain rigidity since it is mechanically peeled off from the plate after hardened. Usually, it is sufficient that the original plate or stamper 1 is >=100 mum thick and preferably 400 - 5000 mum thick. Any material can be used for the resin layer 2 as far as the layer can be formed to have uniform thickness on the original plate or stamper 1 and the layer can be processed and hardened after the pattern is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a roll-shaped mold or stamper for forming a concavo-convex preformat pattern on a substrate of an optical recording medium.

[Conventional technology]

Conventionally, magnetic materials such as magnetic tapes and magnetic disks, various semiconductor memories, and the like have been mainly used to record various types of information. Although this kind of magnetic memory semiconductor memory has the advantage of being able to easily write and read information, it also has the disadvantage that the content of the information can be easily tampered with.
Another problem was that high-density recording was not possible. In order to solve these problems, an optical information recording method using an optical recording medium has been proposed as a means to efficiently handle a wide variety of information, and an optical information recording carrier, a recording/reproducing method, and a recording/reproducing apparatus for this purpose have been proposed. has been done.

Such an optical recording medium as an information recording carrier is generally produced by using a laser beam to evaporate a part of the optical recording layer on the information recording carrier, to cause a change in reflectance, or to cause deformation. Information is recorded or reproduced based on differences in optical reflectance and transmittance. in this case,
The optical recording layer does not require any development treatment after information is written, and can be read directly after writing, so-called D.
It is a RAW (Direct Read After Write) medium that allows high-density recording and additional writing, making it effective as an information recording/storage medium.

FIG. 7 is a schematic cross-sectional view of an optical recording medium. In FIG. 7, 41 is a transparent substrate, 42 is a track groove, and 43 is a transparent substrate.
4 is an optical recording layer, 44 is a spacer/adhesive layer, and 45 is a protective substrate. In FIG. 7, information is recorded and read out optically through a transparent substrate 41 and track grooves 42. At this time, tracking can be performed using the phase difference of the laser beam by utilizing the fine irregularities of the track groove.

In this way, a concave-convex preformat that becomes a track groove, an address pit, etc. is formed on the substrate of an optical recording medium.

The formation of this uneven preformat on the substrate can be done by, for example,
With conventional video discs, audio discs, etc.
In general, a stub bar with an uneven shape formed in advance is used to transfer the uneven shape of the stub bar onto a transparent resin substrate using a press method, an injection molding method, or an ultraviolet curing resin method. The above method is generally a single-wafer process, but for example,
JP-A-56-87203, JP-A-56-8672
As in Publication No. 1, as shown in FIG.
A method of continuously forming a concavo-convex pattern on a substrate 1 is also widely used. In the above-mentioned prior art, as shown in FIG. 4, the stand bar 12 is attached to the roll 11 with adhesive or double-sided tape, or fixed with screws. This stanbar 12 is generally manufactured by forming a pattern in a photolithography process, developing it, making it conductive, and then electroforming nickel, but these processes take a lot of time and are expensive to manufacture. The problem was that it was expensive and impractical. Further, when the stambar and the roll are fixed with screws or the like without adhesive, it is difficult to completely expel the air between the stambar and the roll and bring them into close contact. When air enters between the stand bar and the roll, there is another problem in that unevenness occurs on the surface of the stand bar, and the unevenness is transferred to the resin, deteriorating the quality of the substrate of the optical recording medium. Furthermore, if the stambar is thin, it will lack strength, resulting in poor durability.On the other hand, if the stambar is thick, it will not only be difficult to wrap around a roll, but will also have poor thermal conductivity. There is also the problem that the rate also gets worse.

Introduction to printing machinery and new photosensitive resins (Printing Society Publishing Department)
describes a general plate-making technique as shown in FIGS. 5 and 6. In FIG. 5, a roll 21 is rolled over a mask 22 on which a pattern has been formed in advance, and electron beams or electromagnetic waves are irradiated to transfer the pattern of the mask onto the roll. Further, in the method shown in FIG. 6, a pattern is directly drawn by scanning a light beam 32 in one direction while rotating a roll 31 coated with photosensitive resin or the like around an axis. However, since the patterns on optical recording media are as fine as submicrons, it is currently impossible to transfer submicron pattern line widths using the method shown in FIG. 5 due to the optical resolution. Furthermore, in the method shown in FIG. 6, the spiral pattern must be accurately positioned and drawn with submicron precision while the roll and beam are interlocked, and mechanical control of both is difficult. Furthermore, since precision is required for the roll bearings and the flatness of the roll surface, processing of the rolls is also difficult. As described above, it is difficult to manufacture roll molds for optical recording media by applying general plate-making techniques.

[Problems to be Solved by the Invention] The present invention has been made in view of the above problems.

That is, according to the present invention, a concavo-convex preformat can be continuously and precisely formed on a substrate for an information recording medium. A roll mold for forming a substrate for an information recording medium can be made more easily. The object of the present invention is to provide a method for manufacturing a roll mold for forming a substrate for an information recording medium.

Another object of the present invention is to provide a method for manufacturing an information recording medium that is excellent in mass productivity and can obtain a high quality information recording medium at low cost.

[Means for solving problems]

That is, the method for manufacturing a roll mold for forming a substrate for an information recording medium of the present invention is a method for manufacturing a roll mold for forming a substrate for an information recording medium, in which a concave-convex preformat is continuously formed on the substrate for an information recording medium. A resin layer is formed by coating a liquid resin on the original plate on which a concavo-convex preformat pattern corresponding to the concavo-convex preformat is formed, and the resin layer to which the concavo-convex preformat pattern is transferred is applied to the surface of the roll base material. This method is characterized in that the resin layer is fixed with the surface on which the uneven preformat pattern is formed facing outward. Further, the method for manufacturing a substrate for an information recording medium of the present invention is a method for continuously manufacturing a substrate for an information recording medium having an uneven preformat, in which an uneven preformat pattern corresponding to the uneven preformat is formed. A resin layer is formed on the original plate, and then a liquid resin to which the uneven preformat pattern is transferred is applied to form a resin layer, and the resin layer to which the uneven preformat pattern is transferred is applied to the surface of the roll base material. The present invention is characterized in that the uneven preformat is formed on the information recording medium substrate using a roll mold in which the resin layer is fixed with the uneven preformat pattern forming surface facing outward.

That is, according to the present invention, there is no need to electroform Ni as in the past, and it is possible to obtain a stamper with higher precision than when creating a stamper using conventional plate-making technology. , it is possible to obtain a high-precision roll mold more easily than before.

[Means to solve the problem]

The present invention will be explained in detail below. 1 to 3 are cross-sectional views showing an embodiment of the method for manufacturing a roll type optical recording medium of the present invention. In FIG. 1, the method for producing a roll type optical recording medium of the present invention includes forming a resin layer 2 with a constant thickness on the surface of an original plate or stamper 1 on which a concavo-convex pattern 3 is formed. . As shown in FIG. 2, after this resin layer 2 is cured, it is transferred and fixed onto the surface of the roller 4. Alternatively, as shown in FIG. 3, after the resin layer 2 is cured, it can be peeled off from the original plate or stand bar 1, and the cured resin layer can be wrapped around the roller 4 and fixed.

The original plate l in the present invention can be used with any method and material as long as it is possible to form unevenness with the necessary precision. For example, an original plate generally used for CDs (compact discs) etc. or stand bar
can be used. It can be manufactured using the manufacturing method generally used for CDs (compact discs), etc. Specifically, resist is applied to a glass master, the pattern is exposed and developed, and then nickel is sputtered. A film is formed and electroformed to deposit nickel to a predetermined thickness. Using the thus obtained second master as a father, a third master (mother) and a grandchild stand may be created. As another method, a method of producing an original plate can also be used. Specifically, a resist is applied to a glass plate on which a metal layer such as chromium is formed, a pattern is exposed and developed, and then a portion of the metal layer is removed by etching or the like to form a concavo-convex pattern. The stamper may be formed from this original plate by exposure. Alternatively, the irregularities may be formed by dry or wet etching after forming a pattern on the glass original plate. In addition to the above materials, metals, metallized metals, glass, ceramics, etc. can also be used. Original plate or stamper 1
In the present invention, since the cured resin layer 2 is mechanically peeled off, it is desirable that the thickness has a certain degree of rigidity. The range of thickness to be used depends on the material of the original plate or stand bar 1, but generally the thickness is 100 μm or more, and the more preferable thickness is 400 to 5000 μm.

The material of the resin layer 2 formed on the surface of the original plate or stamper 1 can be formed to a uniform thickness on the original plate or stamper 1, and a fine pattern can be transferred with high precision, and the fine pattern can be formed. Any material can be used as long as it can be processed and hardened so that the pattern can be maintained after it has been applied. For example, radiation-curable resins such as acrylic resins, thermosetting resins such as epoxy resins, The curing shrinkage rate of any resin that can be used is preferably 5% or less, particularly 1% or less.

In addition, materials that can be coated with a solvent, such as vinyl chloride resin, can be used.

Furthermore, radiation-curable resins having thermoformability can also be used.

Examples of such materials include the following compounds having radically polymerizable unsaturated groups.

(1) In a polymer with a glass transition temperature of 0 to 250°C,
Those with radically polymerizable unsaturated groups. More specifically, the following methods (a) to (d) are applied to polymers obtained by polymerizing or copolymerizing the following compounds 1 to 2.
A radically polymerizable unsaturated group has been introduced.

■ Monomeric weight N-methylacrylamide with hydroxyl group,
2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate), 2-hydroxyne, 3-phenoxybutyl acrylate, 3-phenoxybutyl methacrylate, etc.

■ Monomers with carboxyl groups such as nialic acid, methacrylic acid, acroyloxyethyl monosuccinate, etc.

■ Monomer nigericidyl methacrylate, etc. having an epoxy group.

(2) Monomers having an aziridinyl group: 2-aziridinylethyl methacrylate, allyl 2-aziridinylourobionate, etc.

■ Monomers containing amino groups such as niacrylamide, methacrylamide, diaseptone acrylamide, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, etc.

(2) Monomer having a sulfone group = 2-acrylamide 2-methylpropanesulfonic acid, etc.

(2) Adducts of diisocyanates and radically polymerizable monomers having active hydrogen, such as 1 mol to 1 mol adducts of monomer weight 2.4-toluene diisoanate and 2-hydroxyethyl acrylate, each having an isocyanate group.

■Furthermore, by adjusting the glass transition point of the above copolymer,
In order to adjust the physical properties of the cured film, the above compound and
It is also possible to copolymerize with the following monomers that can be copolymerized with this compound. Examples of such copolymerizable monomers include methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate,
Propyl acrylate, butyl methacrylate, butyl acrylate, isobutyl methacrylate, isobutyl acrylate, t-butyl methacrylate, t-butyl acrylate, isoamyl methacrylate, isoamyl acrylate, cyclohexyl acrylate, cyclohexyl methacrylate, N-methylolmelamine acrylate, 2-ethyl Examples include hexyl methacrylate and 2-ethylhexyl acrylate.

Next, the material according to the present invention can be obtained by reacting the polymer obtained as described above by methods (a) to (d) described below to introduce a radically polymerizable unsaturated group. can.

(a) In the case of a polymer or copolymer of a monomer having a hydroxyl group, a monomer having a carboxyl group such as acrylic acid or methacrylic acid is subjected to a condensation reaction.

(b) In the case of a polymer or copolymer of monomers having a carboxyl group or a sulfone group, the aforementioned monomers having a hydroxyl group are subjected to a condensation reaction.

(c) Polymerization or co-addition reaction of monomers having epoxy groups, isocyanate groups, or aziridinyl groups.

(d) In the case of a polymer or copolymer of a monomer having a hydroxyl group or a carboxyl group, a monomer having an epoxy group or a monomer having an aziridinyl group, or a diisocyanate compound and a hydroxyl group-containing acrylic ester monomer. 1 mole of polymer to 1 mole of adduct is subjected to an addition reaction. In order to carry out the above reaction, it is preferable to add a small amount of a polymerization inhibitor such as hydroquinone and carry out the reaction while blowing dry air.

(2) Another material that can be used in the present invention as a resin having aging properties is a compound having a melting point of 0 to 250°C and a radically polymerizable unsaturated group. Specific examples include stearyl acrylate, stearyl methacrylate, triacryl isocyanurate, cyclohexanediol diacrylate, isochlorohexanediol dimethacrylate, spiroglycol dimethacrylate, and spiroglycol diacrylate. Such radically polymerizable unsaturated monomers improve crosslinking density and heat resistance when irradiated with ionizing radiation, and in addition to the above monomers, ethylene glycol diacrylate, erylene gelyl Dimethacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, hexanediol diacrylate, hexanediol dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, trimethylolpropane diacrylate, trimethylolpropane dimethacrylate, pentaerythritol tetra acrylate, pentaerythritol tetramethacrylate, pentaerythritol triacrylate,
Pentaerythritol trimethacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexamethacrylate, ethylene glycol diglycidyl ether diacrylate, ethylene glycol diglycidyl ether dimethacrylate, polyethylene glycol diglycidyl ether diacrylate, polyethylene glycol diglycidyl ether diacrylate Methacrylate, propylene glycol diglycidyl ether diacrylate, polypropylene glycol diglycidyl ether dimethacrylate, polypropylene glycol diglycidyl ether dimethacrylate, sorbitol tetradiglycidyl ether acrylate, sorbitol tetradiglycidyl ether methacrylate, etc. can be used. Polymer empress solid content 100
It is preferable to use it in an amount of 0.1 to 100 parts by weight based on the violet part. In addition, the above materials can be sufficiently cured by electron beams, but when curing by ultraviolet rays, benzoin ethers such as benzoquinone, benzoin, benzoin methyl ether, halogenated acetophenones, and piatil can be used as sensitizers. It is also possible to use materials that generate radicals when irradiated with ultraviolet rays, such as.

The molding conditions for this resin liquid layer are that the heating temperature is preferably 5.
The temperature is preferably 0 to 300°C, more preferably 100 to 200°C or higher. The pressure to be applied should preferably be 0.1 kg/cm or more.
Preferably 1. Okg/c+rr or more is good. Further, a metal layer may be provided on the cured resin layer 2 if necessary.

The resin layer can be formed using any method generally used for resin coating, but for example, spray coating, dipping, or solvent coating using a roll coater can improve thickness accuracy. (Can be formed. The uneven pattern 3 is formed on the original plate or stambar 1 and transferred to the resin layer 2. The thickness of the resin layer 2 formed on the original plate or stambar 1 depends on the resin used. It can also be used, but 0.1
A range of ~5000 μm is preferred. Further, leveling and preliminary curing steps may be added as necessary. Next, as shown in FIG. 1, after the uneven pattern 3 is formed on the resin layer 2, the resin layer 2 is cured so that the uneven pattern can be maintained.

As a method for curing the resin layer 2, it is preferable to select an optimal method depending on the resin used, but for example, ultraviolet rays or electron beams may be used. In the case of solvent coating, a drying device may be used if necessary. It is also possible to use heating and pressurization as other means. If the viscosity of the resin layer 2 before curing is high and air tends to enter between the original plate and the resin layer 2, the incorporation of air can be prevented by stacking a low viscosity resin layer on top of the high viscosity resin. It can also be prevented.

As shown in FIG. 2.3, the cured resin layer 2 is peeled off from the original and fixed to the surface of the roll 4. In the method shown in FIG. 2, a roll 4 is rolled onto the resin layer 2 to transfer the resin layer 2 onto the surface of the roller 4. The contact pressure between the roll base material 4 and the stand bar or master plate l on which the resin layer 2 is formed, and the pressure and speed at which the roll 4 is rolled are such that air does not enter between the roll 4 and the resin layer 2, and the uneven pattern is formed. Any pressure and speed can be used as long as it does not cause deformation, but from the viewpoint of the durability of the roll mold, the preferable pressure is 10.0 kg/cd or less, especially 8 kg/crrf or less. be. Further, it is preferable to roll at a speed as slow as possible in order to push out air, and a preferable speed is 10 m/min or less. Any method can be used to fix the cured resin layer 2 and the roll 4, and for example, bonding using an adhesive, solvent bonding, etc. can be used. For adhesion, apply adhesive or solvent to the resin layer 2.
Alternatively, this can be easily achieved by coating at least one side of the roll 4.

The adhesive used here is preferably a heat-resistant adhesive, such as an epoxy adhesive.

In the method shown in FIG. 3, the cured resin layer 2 is peeled off from the original plate or stand bar 1. Any method can be used for peeling. For example, it may be peeled off from the suction chucked end. The peeled resin layer 2 can be fixed to the surface of the roll 4 in the same manner as the method shown in FIG.

The roll 4 in the present invention can be made of any material as long as it has a certain degree of hardness and a certain degree of rigidity. Resin or the like can be used, and roman steel is particularly preferred because it can be easily mirror-finished. The roll surface is polished to a mirror finish. The surface accuracy must be approximately the same as or better than the surface accuracy of the optical recording medium to be molded. Specifically, it is preferable that the distance between peaks (hereinafter abbreviated as pp) of the surface unevenness is 50 μm or less when measured with a coordinate measuring machine (manufactured by Carl Zeiss). Further, if necessary, a hardened film of titanium nitride or the like, a protective layer of silicon or the like can be formed on the roll surface, or it can be plated with nickel, chromium or the like.

In the present invention, the uneven preformat pattern formed in a roll type is a pattern of track grooves, address bits, etc., and specifically, has a width of 0.5 μm to 5 μm, for example.
, pitch 1 μm ~ 5 μm 1 depth 0.01 μm ~ 0.4 μm
This is a tracking group pattern for an optical disk or optical card in the form of a spiral, concentric circle, or stripe of m.

Next, methods for manufacturing substrates for information recording media using the roll mold of the present invention include extrusion molding in which unevenness is formed on a resin sheet extruded by melting a resin pellet, and 2P method in which unevenness is formed in an ultraviolet curable resin layer. (Photo poly
merization), embossing molding, calender molding, etc. in which a preformed letter sheet is heated and softened to form irregularities. In particular, the 2P method is preferable because no heat is added.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples.

<Example 1> As shown in Fig. 1, a nickel stump bar (manufactured by Seiko Epson) in which continuous grooves of 1.6 μm pitch, 0.6 μm width, and 700 mm depth were formed was placed on a 2 mm thick glass plate. After laminating and backing, an ultraviolet curable resin (Mitsubishi Rayon, MRA500) was uniformly applied to a thickness of 50 μm using a roll coater. A 2 mm thick glass plate was placed on top of it to prevent air from entering and it was sealed. Two 3kW ultraviolet lamps (Ushio Electric) were installed, and the distance was 200m.
W/ctr? The ultraviolet curable resin was cured by applying ultraviolet rays with an intensity of 100 mL for 30 seconds while air cooling the concavo-convex pattern so that its shape would not change due to the heat of the ultraviolet rays. Thereafter, the glass plate placed on the resin layer was removed, and the same ultraviolet lamp was used to irradiate ultraviolet light for 3 minutes to completely cure the ultraviolet curing resin. As shown in FIG. 2, the completely cured resin layer was coated with the same ultraviolet curable resin on the surface of an iron roll base material with a roll diameter of 200 mm, which had been polished to a mirror finish. The roll base material was transferred onto the roll base material while applying a pressure of 1.0 kg/cm and rolling at a speed of 0.1 m/min to remove it from the stand bar, and then transferred to the roll base material using the same ultraviolet lamp for 3 minutes. The ultraviolet curing resin was completely cured by irradiating ultraviolet rays, and the resin layer was fixed on the roll base material. In addition, in order to increase the surface hardness, we added 10% to the surface of the roller.
A 0 μm thick nickel layer was formed by electroless plating.

The transfer rate of the preformat pattern formed on the stanbar was 97 to 100% in depth. The unevenness on the surface of the roller was 50 μm or less in pp, which was sufficiently small. The eccentricity of the roller surface to which the resin layer has been transferred is sufficiently small.
It was 30 μm or less.

This roll is molded using an extrusion molding machine (manufactured by Hitachi Zosen, product name 5H).
T90-32DVG) at a speed of 23 m/min, the die temperature was 250°C, and the roller temperature was 60°C.
1285) was extruded. When the extruded substrate was measured, the amount of surface runout was 50 μm or less in terms of pp, which was sufficiently small. Cut this board into 86mmφ,
An optical recording material represented by the following structural formula [l''J] was solvent coated.

[I] The protective substrate is made of 0.3 mm thick polycarbonate (
Panrai l-251 (manufactured by Kijin Kasei) was cut to 86 mm diameter and bonded to have an air gap of 0.3 mm.

I tried recording and playing it. Disc rotation speed 180O
rpm.

Writing frequency 3 MHz, writing power 6 m
W, read power 0.5mW, C/N ratio 50d
It was B.

Further, even when 10,000 optical disk substrates were formed using this roller, there was no change in the shape of the roller surface.

<Example 2> In the same way as in Example 1, the same ultraviolet curable resin as in Example 1 was applied on a glass substrate (Asahi Glass) on which a concavo-convex pattern similar to that in Example 1 was formed. 50 in a way
It was applied uniformly to a thickness of μm. It was sealed with the same glass as in Example 1, and the ultraviolet curing resin was cured under the same conditions using the same ultraviolet irradiation device as in Example 1. Post-curing was also carried out under the same conditions as in Example to completely cure the resin. One edge of the cured resin was peeled off using a suction chuck, and the entire resin layer was peeled off from the stand bar by holding the peeled edge. An epoxy adhesive (EP-007, Cemedine) was applied to a thickness of 50 μm on a mirror-polished iron roll with a roll diameter of 200 mmφ. The peeled resin was wrapped around a roll from one side while being pressed down so as not to trap air. Thereafter, the adhesive was left to stand at room temperature for 24 hours to harden. When the resulting roll was measured, the transfer rate of the preformat pattern on the glass substrate was 98 mm deep.
It was ~100%.

The unevenness on the surface of the roller was 50 μm or less in pp, which was sufficiently small. The eccentricity of the roll surface was 30 μm or less, which was sufficiently small. Even after 10,000 optical disk substrates were molded using the same method as in Example 1, no change in surface shape was observed. The characteristics of the molded board are the surface runout amount of 50μ p-p.
It was sufficiently small, less than m.

When an optical recording layer was formed on this optical disk substrate in the same manner as in Example 1 and recording and reproduction was performed, the C/N ratio was 52 dB.

<Example 3> On the same stamper as in Example, the same ultraviolet curable resin as in Example 1 was applied uniformly to a thickness of 50 μm in the same manner as in Example 1, and the same stamper as in Example 1 was applied. The sample was sealed and cured using the same ultraviolet irradiation device as in Example 1 under the same conditions. Post-curing was also carried out in the same manner as in Example I. Using the same method as in Example 1, the same ultraviolet curable resin as in Example 1 was applied to the surface of a glass roll (Corning) with a mirror-polished roll diameter of 200 mm, and then cured in the same manner as in Example 1. The resulting resin layer was transferred onto the roll surface and fixed. When we measured the finished roller, we found that the transfer rate was approximately 95 to 100 mm deep.
% was transferred. The unevenness of the roller surface is 50 pp
It was sufficiently small, less than μm. Inside the roll were two 3kW ultraviolet lamps (Ushio Electric). 1 layer of ultraviolet curing resin (Mitsubishi Rayon, MRA500) was applied on 1.2 mm thick polycarbonate (Yoto Kasei, Panlite 202).
It was coated to a thickness of 0 μm and cured while transferring the pattern using this roll at a feed rate of 3 m/min, a roll pressure of 1.5 kg/crrr, and an irradiated ultraviolet intensity of 180 mW/c g. Thereafter, a disk was produced in the same manner as in Example 1. When this optical disk substrate was recorded and reproduced under the same conditions as in Example 1, the C/N ratio was 5.
It was 3dB.

〔Effect of the invention〕

According to the present invention, since a molding roll mold can be manufactured with high precision and a simple mechanism, it is possible to manufacture a roll mold for manufacturing optical recording media with good surface accuracy and pattern transferability at low cost. be.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a roll mold for manufacturing an optical recording medium according to the present invention. FIG. 2 is a schematic cross-sectional view of a roll mold for producing an optical recording medium according to the present invention. FIG. 3 is a schematic cross-sectional view of a roll mold for producing an optical recording medium according to the present invention. FIG. 4 shows a conventional method for attaching a stamper for manufacturing an optical recording medium. FIG. 5 shows a roll pattern transfer method using a conventional plate-making method. FIG. 6 shows a roll pattern transfer method using a conventional plate-making method. FIG. 7 is a general cross-sectional view of a conventional optical recording medium. FIG. 8 is a schematic diagram of a conventional continuous manufacturing method for a substrate of an optical recording medium. 1... Original plate or stamper 2... Resin layer 3... Uneven pattern 4... Roll base material 11... Pressure roller 12... Pasted stamper 2]... For plate making Roll 22... Mask 23 with a pattern formed thereon... Light beam for pattern exposure 31... Roll for plate making 32... Light beam for pattern exposure 41... Transparent substrate 42... Track groove portion 43... ... Optical recording medium 44 ... Spacer 45 ... Protective substrate 51 ... Resin sheet 52 ... Molding roll 53 ... Pressure or tension roll 54 ... Unwinding roll 55 ...・Take-up roll

Claims (2)

[Claims] (1) In a method for manufacturing a roll mold for forming an information recording medium substrate in which a concavo-convex preformat is continuously formed on an information recording medium substrate, a concave-convex preformat pattern corresponding to the concave-convex preformat is formed on an original plate. A liquid resin is applied to the resin layer to form a resin layer, and the resin layer to which the uneven preformat pattern is transferred is fixed to the surface of the roll base material with the uneven preformat pattern forming surface of the resin layer facing outward. A method for manufacturing a roll mold for forming a substrate for an information recording medium, characterized by: (2) In a method for continuously manufacturing a substrate for an information recording medium having an uneven preformat, a resin layer is formed on an original plate on which an uneven preformat pattern corresponding to the uneven preformat is formed. Next, a liquid resin to which the uneven preformat pattern has been transferred is applied to form a resin layer, and the resin layer to which the uneven preformat pattern has been transferred is applied to the surface of the roll base material. 1. A method of manufacturing a substrate for an information recording medium, comprising forming a concavo-convex preformat on the substrate for an information recording medium using a roll mold, which is fixed with the pattern forming surface facing outward.