JPH03266237A - Production of substrate for optical recording medium - Google Patents

Abstract

PURPOSE:To obtain a transparent resin substrate having good flatness at low cost by using a long-length stamper comprising a flexible resin material which has a rugged pattern provided on at least one side and is longer than the outer circumference of a roll. CONSTITUTION:The resin is supplied from a hopper 6 to an extruder 5 where the resin is heated and molten, and then extruded from a T-die 4. The extruded molten resin 1 is cooled on a forming roll 2 where a long-length stamper 8 longer than the outer circumference of the roll is wound, and molded into a resin sheet 1a. In this process, the molten resin 1 is cooled and pressed as in contact with the long-length stamper 8 by the forming roll 2 and the press roll 3. Thus the resin is molded into the sheet 1a having a rugged pattern 11 transferred from the stamper 8. The resin sheet 1a with the rugged pattern 11 transferred is drawn by drawing rolls 7. Thus, the transparent resin substrate having good flatness and pattern precision is produced at low cost with good productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a substrate for an optical recording medium, and more particularly to a method for manufacturing a transparent substrate for an optical recording medium for optically recording and reproducing information.

[Prior Art] 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 problem that the information content can be easily tampered with and that high-density recording is not possible. Ta. In order to solve this problem, an optical information recording method using an optical recording medium has been proposed as a means for efficiently handling a wide variety of information, and an optical information recording carrier,
Recording/reproducing methods, recording/reproducing devices, etc. have been proposed.

Such an optical recording medium as an information recording carrier is generally prepared by using a laser beam to evaporate a part of the optical recording layer on the optical recording medium, 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.
So-called DRA that allows you to “read directly after writing”
W (direct read after write; dir
It is an effective medium for recording and storing information because it is capable of high-density recording and additional writing is possible.

FIGS. 9(a) and 9(b) are schematic cross-sectional views of conventional optical recording media, and FIG. 9(a) is a disk-shaped optical recording medium,
FIG. 9(b) shows a card-shaped optical recording medium. In FIG. 9, 31 is a transparent resin substrate, 32 is a track groove,
33 is an optical recording layer, 34 is a spacer 35 is an adhesive layer, 3
6 is a protection substrate. In Figure 9, the information record and
For reproduction, writing and reading are performed optically through the transparent substrate 31 and the track groove portion 32. At this time, the configuration is such that tracking can be performed by utilizing the fine irregularities of the track groove portion 32 and the phase difference of the laser beam.

Conventional video discs, audio discs, etc. as mentioned above are made of polyvinyl chloride (PVC), a thermoplastic resin.
) or polycarbonate resin (PC) by press molding or injection molding using a mold in which information is recorded in advance. In addition, there is a calendar method in which information or a preformat pattern is transferred to a resin sheet by heating and pressing with a forming roll (Japanese Patent Laid-Open No. 56-86
721 Publication), 2P method of transferring the preformat pattern of a forming roll onto a resin sheet using ultraviolet/electron beam curing resin (Japanese Patent Application Laid-Open No. 56-84921, Japanese Patent Application Laid-open No. 56-84922, Japanese Patent Application Laid-open No. 56-84922, 56-87203, JP 56-106829, JP 56-1
No. 26132, Japanese Unexamined Patent Publication No. 57-50304, W
088/03311) is also used. Since these methods are continuous manufacturing methods, resin substrates can be manufactured efficiently. There are two ways to manufacture molding rolls for continuous molding: one is to form a pattern directly on the roll, and the other is to create a stamper (frame) with a sheet pattern formed on it and adhere it to the roll using an adhesive. Fixing method using methods such as (Special Publication No. 11518/1983)
, and single-leaf stampers using magnetic, adsorption, or mechanical methods.
Method of fixing to a roll (Japanese Utility Model Publication No. 15825/1982, Publication of Japanese Utility Model Application No. 9568/1983, Publication of Japanese Utility Model Application No. 57-164)
No. 839), etc. are used.

Also known is a method of manufacturing a resin mold by transferring a mold pattern onto resin. (Japanese Patent Publication No. 49-117248, JP-A No. 54-9603, JP-A-57-503)
43 Publication, W088/03311 Publication) [Problems to be Solved by the Invention] Unlike the above-mentioned conventional methods for recording video discs, audio discs, etc., optical recording media such as optical discs, optical cards, optical tapes, etc. In order to perform recording and playback at a much higher density than with audio discs, much higher pattern accuracy and surface accuracy than conventional methods are required. For this reason, resin substrate molding equipment is required to have good pattern precision, surface precision, and flatness. In conventional methods such as the above-mentioned calendar molding method and ultraviolet curing resin method, there are two methods: attaching a thin sheet stamper to the surface of the molding roll, and forming a pattern directly on the surface of the roll. It is used.

However, with the method of attaching a thin sheet-like single-fed stamper to the roll surface, it is possible to create a stamper for each stamper, so a flat stamper can be created using photolithography-related equipment, and the pattern can be Although it is possible to manufacture a stamper with good precision, when the obtained single-wafer stamper is fixed to the roll surface using an adhesive or mechanical fixing method, a normal single-wafer stamper is Since one or a small number of patterns are formed on the stamper, it is not possible to form a very large stamper, so a plurality of stampers are often fixed to a roll of paper. In addition, in calendar molding and ultraviolet curing resin methods, a pattern is formed on a pre-formed resin sheet, but in this case, in order to form a resin sheet with small molding irregularities such as birefringence and guiline, the surface precision of the forming roll is However, in extrusion molding, if the surface precision of the molding roll is poor or uneven, the extruded resin may
Because sufficient pressure is not applied during molding, fine patterns may not be accurately transferred, the thickness of the substrate may become uneven due to uneven molding, and optical problems such as transparency and birefringence may occur depending on the resin used. Characteristics deteriorate. for that,
The extrusion molding method requires better roll surface precision than other methods.

Furthermore, the above method of attaching the stamper has a problem in that a step is created at the end of the stamper and the surface accuracy of the roll is deteriorated. Furthermore, when fixing with an adhesive or the like, there is a problem that depending on the fixing method, the surface of the stamper becomes uneven due to curing shrinkage or uneven flow of the adhesive, resulting in poor surface accuracy of the roll.

In addition, in the extrusion molding method, molding is performed at a higher temperature than in calendar molding or ultraviolet curing resin methods, so there are many problems with the roll and stamper surfaces becoming dirty due to resin adhesion or burning during molding. Stampers are generally made of metals such as nickel or metal compounds, so they are particularly prone to resin seizure (and poor mold durability).
It has become. Rolls and stampers must be cleaned each time they become dirty. Therefore, there is a problem that the workability is deteriorated. Further, when cleaning dirt, cleaning liquid may seep into the joint between the stamper and the roll, and the stamper may peel off from the roll. Furthermore, in order to improve moldability, the stamper must be firmly fixed, and if the stamper is fixed firmly, it is time-consuming to peel it off and fix it again when replacing the stamper, making quick changes difficult. (There is a problem.

In the method of directly forming a pattern on the roll, the surface of the roll can be processed with high precision.However, the problem arises that it is difficult to draw or transfer a pattern with high precision on the surface of the cylindrical roll. This method generally uses rolls made of metal, metal compounds, or glass, so if the roll surface becomes dirty due to resin adhesion or burn-in during molding, it is impossible to remove and replace the stamper, so it is necessary to remove the stamper each time. Since the entire roll must be removed from the molding machine and cleaned, there is a problem in that the operability becomes significantly worse.Furthermore, if a part of the roll is damaged due to scratches, the entire roll may become a defective product. There is also the problem that it becomes

The present invention has been made for the purpose of solving the above-mentioned problems, and instead of using an expensive metal stamper that requires many manufacturing steps in the conventional manufacturing method of a transparent substrate with a preformat, it is possible to use an inexpensive and disposable stamper. A method for manufacturing a transparent resin substrate with good flatness at a low cost and with high productivity by molding molten resin using a long resin stamper that can form fine patterns with high precision. The purpose is to provide the following.

[Means for Solving the Problems] That is, the present invention provides a substrate for an optical recording medium that records and reproduces information by changing optical properties such as reflectance and transmittance by irradiation with a light beam such as a laser beam. is made of a flexible resin material, has an uneven pattern formed on at least one surface, and is made of a flexible resin material, which is formed by extruding a resin by melting it, extruding it, and molding it using a roll. The long stamper and the extruded molten resin are heated and heated together between a pressure roll and a forming roll.
This is a method for manufacturing a substrate for an optical recording medium, characterized in that a transparent substrate with a preformat is manufactured by pressurizing and molding a molten resin.

The present invention will be explained in detail below.

The present invention uses a long resin stamper that is inexpensive and has good surface accuracy (and good pattern transferability), and simultaneously molds the molten resin and heats and pressurizes it with a pressure roll. In addition, the long resin stamper can be made disposable, and there is no need to clean the roll or stamper, making it possible to produce transparent resin substrates with good flatness and pattern accuracy at low cost and with high productivity. It is characterized by manufacturing.

FIG. 1 is an explanatory diagram showing one embodiment of the method for manufacturing an optical recording medium substrate of the present invention, and FIG. 2 is a partial explanatory diagram thereof. In the figure, the method for manufacturing an optical recording medium substrate of the present invention is as follows:
The resin introduced from the hopper 6 is heated and melted by the router 5 to become a molten resin, and then extruded from the T-die 4. The extruded molten resin 1 is passed through a long stamper 8
The resin sheet 1a is cooled on the forming roll 2 around which the resin sheet 1a is wound. As shown in FIG. 2, at this time, the molten resin 1 is pressed and cooled by the forming roll 2 and the pressure roll 3 while remaining in contact with the elongated stamper 8 to form the resin sheet la.
As a result, the uneven pattern 11 on the long stamper 8 is transferred. Resin sheet 1a to which uneven pattern 11 has been transferred
is taken up by a take-up roll 7 and sent to the next process.

Further, the elongated stamper 8 is taken out from the unwinding roll 9, and after forming the molten resin 1 on the forming roll 2, it is wound up on the take-up roll lO, and at the same time, a new elongated stamper is placed on the forming roll 2. rolled out on top. The rolled-up long stamper 8 is disposable.

FIGS. 3(a) and 3(b) are configuration diagrams showing an example of a long stamper used in the present invention, and FIGS. 4 to 7 are cross-sectional explanatory diagrams showing a method for manufacturing the long stamper, respectively. .

In FIG. 3, the long stamper 8 of the present invention has a concavo-convex pattern 11 formed on a base sheet 12 made of a flexible resin material. For long stampers like this,
One or more preformat patterns are formed on a long sheet made of a flexible resin material.
The uneven pattern 11 is formed on the base sheet 12 using the master 13 on which - or a plurality of patterns are formed, by any of the four methods shown below. The formation of the concavo-convex pattern 11 is repeated until the pattern is formed on all the necessary portions of the base sheet 12, thereby producing a long stamper 8 in which a large number of concavo-convex patterns 11 are usually formed. Since the long stamper 8 is wound around the molding roll 2 to mold the molten resin, it needs to have a length of at least one circumference of the molding roll 2. It is also possible to form a hardened film/protective film made of a metal such as nickel or chromium, a metal compound, metal alloys, glass, ceramics, etc. on the base sheet 12 on which the uneven pattern 11 is formed, if necessary. be. Further, a protective layer may be formed on the opposite side of the patterned side of the base sheet 12 in the same way as the patterned side.
It is also possible to attach a backing material.

Next, four methods of manufacturing the long stamper 8 will be explained below.

(1) The first long stamper is a long sheet made of a flexible resin material, and a master disk on which a concavo-convex pattern corresponding to the information to be recorded is formed is placed in close contact with the long sheet.
A preformat pattern is formed by applying heat and pressure while keeping the two in close contact with each other to transfer the pattern on the master.

A specific method for manufacturing the long stamper 8 is as shown in FIG.
A base sheet 12 made of a thermoplastic resin or a thermosetting resin is brought into close contact with the master disk 13 on which the base sheet 13 is formed. After the base sheet 12 is heated and pressurized while closely contacting the master 13 with a pressure die 16 to transfer the concavo-convex pattern 11 of the master 13 onto the base sheet 12, the base sheet 12 is peeled off from the master 13. It is manufactured through this series of steps. If necessary, a resin layer with good moldability may be provided on the base sheet 12.

(2) The second elongated stamper is made of ultraviolet curing resin or electron beam curing resin between a elongated sheet made of a flexible resin material and a master disk on which a concavo-convex pattern corresponding to the information to be recorded is formed. A preformat pattern is formed by filling the disc to a uniform thickness and bringing them into close contact with each other, and then irradiating them with ultraviolet rays or electron beams while they are in close contact to transfer the pattern on the master disc to form a preformat pattern.

A specific method for manufacturing the long stamper 8 is as shown in FIG.
A resin liquid 14 of an ultraviolet curable resin or an electron beam curable resin is applied onto the master 13 on which the curable resin is formed. If necessary, heat leveling is performed so that the thickness of the resin liquid becomes uniform. To prevent air bubbles from entering the applied resin liquid 14, the base sheets 12 made of resin are placed together, and the resin liquid 1 is applied between them.
Fill with 4. If necessary, apply pressure so that the resin liquid has a uniform thickness. The applied resin liquid is irradiated with a necessary amount of radiation such as ultraviolet rays or electron beams from an ultraviolet lamp or an electron beam source 15 to harden the resin liquid and transfer the uneven pattern 11 of the master 13 to the resin liquid 14.

The cured resin liquid 14 is peeled off from the master 13 along with the base sheet 12. It is manufactured through this series of steps. Moreover, FIG. 8 is a block diagram of a general manufacturing apparatus used to implement this method. Further, general manufacturing equipment can be used in other methods as well.

(3) The third long stamper is made of thermoformable ultraviolet curable resin between a long sheet made of a flexible resin material and a master disk on which a concavo-convex pattern corresponding to the information to be recorded is formed. Alternatively, electron beam curing resin is filled to a uniform thickness and brought into close contact, and the uneven pattern of the master is transferred to the resin liquid by heating and pressurizing them while they are in close contact, and then irradiating with ultraviolet rays or electron beams. A preformat pattern is formed by curing a resin liquid.

A specific method for manufacturing the long stamper 8 is shown in FIG.
As shown in a) and (b), a thermoformable resin liquid 17 is cured with radiation such as ultraviolet rays or electron beams on a master 13 on which a concavo-convex pattern 11 corresponding to the information to be recorded is formed. to form a layer of resin liquid. If necessary, heat leveling is performed so that the resin liquid 17 has a uniform thickness. A base sheet 12 made of resin is placed on top of the applied resin liquid to prevent air bubbles from entering it.

If necessary, apply pressure so that the resin liquid layer has a uniform thickness. The base sheet 12 coated with the resin liquid 17 is placed on the master disc 1.
3 and pressure mold 16 while heating and pressurizing the master 13.
The uneven pattern 11 is applied to the resin liquid 17 on the base sheet 12.
layer. Next, the layer of resin liquid 17 on the base sheet 12 is irradiated with a necessary amount of radiation 15 such as ultraviolet rays or electron beams to harden it, thereby forming the uneven pattern 1 of the master 13.
1 is transferred to the resin liquid 17. Hardened base sheet 1
The layer of resin liquid 17 on 2 is peeled off from master 13. It is manufactured through this series of steps.

(4) The fourth long stamper is formed by reacting with heat, pressure, etc. between a long sheet made of a flexible resin material and a master disk on which a concavo-convex pattern corresponding to the information to be recorded is formed. Filled with resin that polymerizes and hardens to a uniform thickness and adheres tightly.
Thereafter, the resin liquid is cured by heating and/or pressure to form a preformat pattern.

A specific method for manufacturing the long stamper 8 is as shown in FIG.
A resin liquid 18 that polymerizes and hardens by reacting with heat, pressure, etc. is applied onto the master disk 13 on which the resin liquid 18 is formed. In order to prevent air bubbles from entering the applied resin liquid 18, a spacer 19 or the like is used to provide a gap of a certain size, and the backing material 20 is brought together, and the resin liquid 18 is filled in the gap. as needed,
The resin liquid 18 is cured by heating and/or pressurized so that the thickness of the resin liquid 18 becomes uniform, and the uneven pattern 11 of the master 13 is transferred to the resin liquid 18. Hardened resin liquid 1
8 is peeled off from the master disk 13. It is manufactured through this series of steps. In this method, base sea) 12 can be used or not. However, it is necessary that the molded resin liquid 18 have the same physical properties as the pace sheet 12 used in the other three methods.

The material of molten resin 1 has good transparency and high mechanical strength (,
Any material can be used as long as it has good hygroscopicity. For example, polymethyl methacrylic resin, polycarbonate resin, polystyrene resin, etc. can be used. It is also possible to use copolymers of these resins and other resins. Furthermore, the optimum conditions for extrusion molding can be selected depending on the type of resin used, ease of flow, molecular weight, glass transition point, type and amount of additives added to the resin, etc. The preferred compression ratio conditions are such that the birefringence of the effective portion of the molded substrate through which the recording/reproducing light passes is
This is a condition where the reproduction light is 1100n or less in double pass.

For example, when using polycarbonate as the resin,
The average molecular weight of the resin is suitably 18,000 to 50,000, more preferably 25,000 to 50,000.

If the number average molecular weight is higher than 50,000, the melt viscosity of the resin is high, resulting in high melting and molding temperatures, which tends to cause yellowing due to thermal decomposition of the resin, and also makes it difficult to transfer uneven patterns. On the other hand, if the number average molecular weight of the resin is low (less than 18,000), the mechanical strength will be low, making it easier for cracks to occur during molding, and the durability and solvent resistance of the resin will be poor. becomes worse.

In addition, in extrusion molding, the resin temperature is 200 to 400℃.
In order to mold the polycarbonate resin by heating it to a high temperature, it is desirable that the glass transition point of the polycarbonate resin is 125° C. or higher.

In the extrusion molding method used in the present invention, the flow rate of molten resin during molding is lower than in conventional injection molding methods, so it is possible to manufacture transparent resin substrates with low birefringence even with resins having a high average molecular weight. It is possible, but on the other hand,
Because tension is applied to wind up the extruded resin,
Mechanical strength is necessary. As for the optimum average molecular weight of the polycarbonate resin used for this purpose, it is preferable to use a slightly higher average molecular weight even if the same resin is used.

In addition, the polycarbonate resin may include, if necessary,
Phosphite esters such as diesters or triesters of phosphorous acid and alcohols or phenols may be added. Additionally, if necessary, a required amount of ultraviolet absorber can be mixed into the polycarbonate resin in order to improve durability and light resistance. As the ultraviolet absorber, salicylic acid type, benzophenone type, benzotriazole type, cyanoacrylate type, etc. can be used. A melting method or the like can be used for mixing the resin into the resin.

In the present invention, preferred extrusion molding conditions for producing an optical recording medium substrate by extrusion molding using the polycarbonate resin prepared as described above are a Ruder temperature of 250 to 350°C, T die temperature is 2
50-350℃, forming roll temperature 100-200℃
It is. In this molding, the temperature of the ruler or T-die is raised to 350°C or higher (this is not preferable because the resin will thermally decompose and turn black or yellow. If the temperature is lower than 250°C, the fluidity of the molten resin will deteriorate, resulting in uneven substrate thickness and birefringence. Melting can be achieved even when the die temperature is in the range of 200 to 400°C.

The extrusion speed is at least 2 m/min, preferably at least 1 Om/min. The preferred temperature of the forming roll is 100 to 200°C for both the forming roll and the pressure roll.

If this roll temperature is high (over 200℃), the resin to be molded will stick to the roll and become difficult to peel off, or the end face of the resin will crack when demolding.On the other hand, if the roll temperature is lower than 100℃ If the temperature is too low, it will not be possible to transfer the uneven pattern formed on the roll. When rolling a long stamper, it is preferable that the winding speed be the same as the speed of the forming roll. It is preferable that the temperature be within ±1°C.

The forming roll 2 can be made of any material as long as it has high hardness and good thermal conductivity; for example, metals such as iron and chromite, metal alloys, metal compounds, etc. can be used. can.

The processing of the roll surface includes derusting, degreasing, removing moisture, and polishing. The surface accuracy must be approximately the same as or better than the surface accuracy of the optical recording medium to be molded. A preferable surface accuracy is IS or less, and a more preferable surface accuracy is 0.1S or less. Further, if necessary, a hardened film such as titanium nitride or a protective layer such as silicon may be formed on the surface, or chrome plating may be applied. It is also possible to provide the forming roll 2 or the like with notches or uneven portions for positioning.

A long stamper 8 is wound around a forming roll 2 to form a molten resin 1. The long stamper 8 does not need to be particularly fixed to the forming roll 2, but it is possible to attach a tab or use unevenness such as a pin to align the long stamper 8 and the forming roll 2 so that their relative positions do not deviate. It is.

The base sheet 12 in the present invention is flexible,
In molding the molten resin 1, any resin material can be used as long as it has sufficient heat resistance, ultraviolet ray/electron beam resistance, and mechanical strength.

For example, resins such as polyethylene terephthalic acid, polyimide, polyether ether ketone, polystyrene, ABS, polycarbonate, polymethyl methacrylate, polyvinyl chloride, polyolefin, and epoxy;
Also, copolymers of these resins can be used. The surface precision of the base sheet 12 is preferably better than or equal to the surface precision of the forming roll 2. 5ILm in pp
The following are more preferred.

The master disc 13 having the concavo-convex pattern 11 can be manufactured by a manufacturing method generally used for CDs (compact discs) and the like. Specifically, a resist is applied to a glass master disk, a pattern is exposed and developed, a nickel film is formed by sputtering, and nickel is deposited to a predetermined thickness by electroforming.

Using the thus obtained second master as a father, a third master (mother) and a grandchild stamper may be created. In the present invention, the master disk 13 having the concavo-convex pattern 11 is used to process the pattern on the base sheet, so the thickness of the master disk is set to a thickness that provides the mechanical strength and durability necessary for the processing method used. The range used is 10-200
It is 0 μm.

In the second manufacturing method of the long stamper 8 of the present invention, in addition to the above-mentioned items, as the ultraviolet curable resin or electron beam curable resin used, a prepolymer, oligomer, or monomer having an unsaturated bond in the molecule may be used. I can do it. For example, unsaturated polyesters, acrylates such as epoxy acrylate, urethane acrylate, and polyether acrylate, and one or more types of methacrylates such as epoxy methacrylate, urethane methacrylate, polyether methacrylate, and polyester methacrylate are used in the molecule. A mixture of a monomer having a bond or a functional compound can be used, or a sensitizer or the like may be added thereto as necessary. A known method can be used for applying these resin liquids. For example, roll coating, knife coating, bar code, gravure coating, screen printing, etc. can be used. Base sheet 12 and material resin liquid 1
In order to improve the adhesion of No. 4, a brimer layer made of an anchor material may be provided. In order to bring the master 13 and base sheet 12 into close contact with each other, a weight of 0.1 kg/c is applied between the two before curing.
It is preferable to apply a pressure of 1 kg/Cm or more, preferably 1 kg/Cm.

In the first manufacturing method of the long stamper 8 of the present invention, other than the above-mentioned items, the heating temperature of the base sheet 12 may be 80° C. or higher, although it depends on the material used. The temperature is preferably 100°C or higher. The applied pressure is preferably 0.1 kg/cm'', preferably 1.0 kg/cm'' or more.

In the third manufacturing method of the long stamper 8 of the present invention, in addition to the above items, the resin liquid 17 on the base sheet 12 is a resin that has thermoformability and is hardened by ultraviolet rays or electron beams. It is solid at room temperature, and the base sheet 1
2, the base sheet 12 can also be rolled up as a single sheet. Examples of such materials include the following thermoformable materials 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.

■ Monomers with hydroxyl groups 2N-methylacrylamide, 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.

■ Monomers such as nigericidyl methacrylate having epoxy groups.

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

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

(2) Monomers having a sulfone group: 2-acrylamido-2-methylpropanesulfonic acid, etc.

(2) Monomer having an isocyanate group: an adduct of a diisocyanate and a radically polymerizable monomer having active hydrogen, such as a 1 mol to 1 mol adduct of 2,4-toluene diisocyanate and 2-hydroxyethyl acrylate.

■ Furthermore, in order to adjust the glass transition point of the above copolymer and the physical properties of the cured film, the above compound is copolymerized with the following monomers that can be copolymerized with this compound. It can also happen. Examples of such copolymerizable monomers include methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, butyl methacrylate, butyl acrylate, inbutyl methacrylate, isobutyl acrylate, t-butyl methacrylate, t-butyl Acrylate, inamyl methacrylate, inamyl acrylate, cyclohexyl acrylate, cyclohexyl methacrylate, N-methylolmelamine acrylate, 2-ethylhexyl methacrylate, 2-ethylhexyl acrylate, and the like.

Next, the polymer obtained as described above is reacted by the methods (a) to (d) described below to introduce a radically polymerizable unsaturated group, thereby obtaining the material according to the present invention. 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) In the case of a polymer or copolymer of a monomer having an epoxy group, incyanate group, or aziridinyl group, the above-mentioned monomer having a hydroxyl group or monomer having a carboxyl group is subjected to an addition reaction. .

(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 acid ester monomer 1 mole of body 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. Specifically, stearyl acrylate, stearyl methacrylate, triacryl isocyanurate, cyclohexanediol diacrylate, cyclohexanediol dimethacrylate,
Examples include spiroglycol dimethacrylate and spiroglycol diacrylate. Such radically polymerizable unsaturated monomers improve crosslinking density and heat resistance when irradiated with ionizing radiation. Methacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, hexanediol diacrylate, hexanediol dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, trimethylolpropane diacrylate, trimethylolpropane dimethacrylate, pentaerythritol tetraacrylate , 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 dimethacrylate, propylene glycol diglycidyl ether diacrylate, polypropylene glycol diglycidyl ether dimethacrylate, polypropylene glycol diglycidyl ether dimethacrylate, sorbitol tetradiglycidyl ether acrylate 1. Sorbitol tetradiglycidyl ether methacrylate or the like can be used, and it is preferably used in a proportion of 0.1 to 100 parts by weight based on 100 parts by weight of the solid content of the above-mentioned copolymer mixture.

The above materials can be sufficiently cured with electron beams, but when curing with ultraviolet rays, sensitizers such as benzoquinone, benzoin, benzoin ethers such as benzoin methyl ether, halogenated acetophenones, biacyl, etc. A material that generates radicals when irradiated with ultraviolet rays can also be used.

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 applied pressure is preferably O.1 kg/cm2, preferably 1.0 kg/cm2 or more.

Next, in the fourth manufacturing method of the long stamper 8 of the present invention, in addition to the above-mentioned items, the backing material 20 is made of resin by filling a space between it and the master 13 with a resin liquid, and heating and/or pressurizing it. Any material can be used as long as it has heat resistance, solvent resistance, and mechanical strength that can sufficiently withstand the liquid being cured and molded. For example, the same metal, metal compound, glass, ceramics, etc. as the master disk 13 can be used. The thickness can also be the same as that of the master 13.

Any material can be used for the spacer 19 as long as it can fix the master 13 and the backing material 20 with a certain gap. For example, the same metal, metal compound, glass, ceramics, polyvinyl chloride, polyethylene terephthalate, or other resin as used for the master 13 can be used.

The thickness of the spacer varies depending on the thickness of the resin stamper to be manufactured, but is usually preferably 10 μm to 20 mm.
Particularly preferred is 0.1 to 10 mm.

As the resin liquid, any resin or its monomer can be used as long as it can be cured by heating and/or pressure. For example, polymethyl methacrylate, epoxy, etc. can be used. In addition, resins that can be dissolved in a solvent and then cured after removing the solvent can also be used. For example, polymers or copolymers such as polyethylene terephthalate, polyethylene, polycarbonate, polystyrene, polyvinyl butyral, polyimide polymethyl methacrylate, polyvinyl chloride, polyolefin, epoxy resin, etc. can be used. As for the molding conditions for this resin liquid layer, it is preferable to select optimal conditions depending on the type of resin used.

Using the substrate manufactured by the method of the present invention, an optical recording layer or a reflective layer, and other protective layers as necessary can be provided on the substrate, and then the substrate can be cut, inspected, and packaged to obtain an optical recording medium. can. These methods and materials can be freely selected from those commonly used in optical recording media.

The method for manufacturing a substrate for an optical recording medium of the present invention can be used for manufacturing any substrate for an optical recording medium such as, for example, an optical disk, an optical card, an optical tape, an optical coin, and the like.

[Function] The method of manufacturing a substrate for an optical recording medium of the present invention is a method for producing a substrate for an optical recording medium, which records and reproduces information by changing optical properties such as reflectance and transmittance by irradiation with a light beam such as a laser beam. A method of continuously manufacturing a substrate by melting a resin, extruding it, and molding it using a roll. A long stamper with a length longer than the outer circumference, which is inexpensive and has good surface accuracy (and has good pattern transferability), and the extruded molten resin are heated and pressed together between a pressure roll and a forming roll to make the molten resin. Because it is molded, there is no need to fix the stamper to the roll as in the past, and the long resin stamper can be disposable, eliminating the need to clean the roll or stamper, allowing fine patterns to be formed with high precision (forming It is possible to produce transparent resin substrates with good flatness at low cost.

[Examples] Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

Example 1 As shown in Figure 3(a), the thickness is 10 μm and the length is 100 m.
A 2 mm thick nickel stamper (300 μm thick) with a diameter of 86 mm in which continuous grooves with a pitch of 1.6 μm, a width of 0.6 μm, and a depth of 700 A were formed was formed on a sheet of polyester resin (Lumiror, manufactured by Toshi) with a width of 300 mm. The pattern was transferred by heating and pressing for 2 minutes at 200℃ and applying a pressure of 10kg/cm'' between the same 2mm thick chrome steel.The transfer was repeated and the pattern was transferred to the base. A long resin stamper with 3,000 (3×1,000) patterns formed on the sheet was created.The pattern transfer was 95% in depth (Taylor Hobson Co., Ltd.,
The transfer of the line width and track pitch was 100% (measured using a surface profile measuring machine manufactured by Elionix Co., Ltd.), and the pattern transfer rate was good. Furthermore, no wrinkles were observed on the surface of the base sheet due to pattern transfer.

As shown in Fig. 1, an iron roll with a roll diameter of 300 mmΦ with a 1 μm thick chrome plating on the surface is used as a forming roll, and the aforementioned long resin stamper is used as a molding resin mold to extrude both. Attached to a molding machine (Hitachi Zosen, 5HT90-32DVG), polycarbonate (Otodai Kasei, K-1285) was extruded at a speed of 2.3 m/min, a temperature of 250°C, and a roll temperature of 150°C.
It was extruded to a thickness of 1.2 mm at ℃. The above-mentioned long resin stamper is synchronized at the same speed as the extrusion speed, is fed onto the forming roller, receives the extruded molten resin onto it, and is then formed into a long resin stamper using the molten resin and the forming roll. The pattern on the long resin stamper was transferred to the molten resin while cooling and molding the molten resin by sandwiching the stamper.

When the extruded substrate was measured, the maximum thickness unevenness was 50 μm, which was sufficiently small.

Furthermore, no wrinkles or lines were observed on the substrate surface. The value of birefringence was 40%m in the double bath, with little variation. (Japan Electron Optical Co., Ltd., birefringence measuring machine, λ=83
00m). The light transmittance was 89% and it was sufficiently transparent. (
Hitachi U-3400, λ=830nm) o Surface runout amount is p
-p was sufficiently small at 20 μm. (Carl Zeiss Co., Ltd., coordinate measuring machine). The transfer rate of the preformat pattern formed on the long stamper was 97 to 98 in depth.
%Met. (Taylor Hobson & Co., Talystep).

The transfer of line width and track pitch was 95 to 96%, and there was no difference in line width and track pitch in the vertical and horizontal directions in the push-out direction. (Elionix Co., Ltd., surface profile measuring machine).

This substrate was cut to a size of 86) Φ, and an optical recording material represented by the following structural formula [eco] was coated with a solvent.

(C mountain) 2N (y flea N (Cl3) aCI!04
゜[For the eco protection board, cut 1.2 mm polycarbonate (Otodai Kasei, Panlight 251) to 130 mmΦ,
It was glued so that there was an air gap of 3 mm.

The result of recording and playback is a disc rotation speed of 180 Orp.
m, writing frequency 3MHz, writing power 6mW
, the read power was 0.5 mW, and the C/N ratio was 50 dB. (Nakamichi Co., Ltd., 0M5-1000II) Example 2 The same polyester sheet as in Example 1 was coated with an ultraviolet curing resin (Nippon Kayaku Co., Ltd., INC118) to a thickness of 10 μm using a screen printing method. Using the equipment shown in the figure, a pitch of 12 μm, a width of 2.8 μm, and a depth of 3000 A was obtained.
100X with continuous grooves of optical card pattern
100mm nickel stamper (300μm thick)
) was used as a master, and a 5KW ultraviolet lamp (Ushio Electric Co., Ltd.) was used to irradiate ultraviolet rays from the base film side at 80 W/cm at a distance of 10 cm to harden the resin liquid and transfer the pattern. The ultraviolet curing resin was completely cured, and a long resin stamper with the same number of patterns as in Example 1 was produced. The pattern transfer depth is 9
9%, and the transfer of line width and track pitch is 100%.
%, and the pattern transfer rate was good. As in Example 1, no wrinkles were observed on the surface of the base sheet due to pattern transfer.

Next, the same chrome-plated roll as in Example 1 with a diameter of 300
An iron roll of mn+Φ and the long resin stamper,
Attached to the same extrusion device as in Example 1, the same resin as in Example 1 was extruded at a speed of 4.0 m/min and a temperature of 25
It was extruded to a thickness of 0.4 mm onto a forming roll equipped with a long resin stamper at a temperature of 0°C and a roll temperature of 150°C. The pattern was transferred in the same manner as in Example 1 by performing molding and cooling simultaneously with extrusion.

When the extruded resin substrate was measured in the same manner as in Example 1, the maximum thickness unevenness was 50 μm.
It was small enough. The value of birefringence was 40%m in the double bath, with little variation. The light transmittance was 89% and it was sufficiently transparent. The amount of surface runout was 50 μm pp, which was sufficiently small. The transfer rate of the preformat pattern formed on the long stamper was 97 to 98% or more in terms of depth. Transfer of line width and track pitch is 99-100%
There was no difference in line width and track pitch in the vertical and horizontal directions in the extrusion direction. Using this board,
After forming an optical recording layer made of the same material as in Example 1,
A 0.25 mm thick polycarbonate (Ondai Kasei, Panlight 202) was used as a protective substrate/backing material, and a 50 μm thick hot melt adhesive (EVA7500EXP80) was used as a protective substrate/backing material.
, Hirodyne) and then 86 x 54 m
An optical card was prepared by cutting the card into a card size of 1.5 m. The result of recording and playback is that the card feed speed is 60mm during recording.
/sec, playback 400mm/sec, writing frequency 7.65
KHz, write power 3.5 mW, read power 0.2 mW, and the C/N ratio was 48 dB.

Example 3 Instead of the ultraviolet curable resin used in Example 2, an electron beam curable resin (urethane acrylate [Nippon Gosei, XP700
B]: Oligoester acrylate [Toagosei, Aronix M7300] = 30 parts by weight, near 0 parts by weight)
The curing conditions were set to electron beam 180KeV, IOMr
The resin liquid was cured in the same manner as in Example 2 by irradiating with AD, and a long resin stamper having the same number of patterns as in Example 2 was produced. Pattern transfer depth is 99
%, and the transfer of line width and track pitch is 100%.
The pattern transfer rate was good. As in Example 1, no wrinkles were observed on the surface of the paste sheet due to pattern transfer.

Next, the same chrome-plated roll as in Example 1 with a diameter of 300
A mmΦ iron roll and the long resin stamper were attached to the same extrusion device as in Example 1, and the same resin as in Example 1 was extruded under the same conditions as in Example 2 to form a pattern.

When the extruded resin substrate was measured in the same manner as in Example 1, the maximum thickness unevenness was 50 μm.
It was small enough. The value of birefringence was 40%m in double pass, and there was little variation. The light transmittance was 89% and it was sufficiently transparent. The amount of surface runout was 50 μm pp, which was sufficiently small. The transfer rate of the preformat pattern formed on the long stamper was 97 to 98% or more in terms of depth. Transfer of line width and track pitch is 99-100%
There was no difference in line width and track pitch in the vertical and horizontal directions in the extrusion direction. Using this board,
After forming an optical recording layer made of the same material as in Example 1,
The same backing as in Example 2 was similarly adhered using the same adhesive. Thereafter, in the same manner as in Example 2, it was cut into card size to produce an optical card. The results of recording and playback show that the card feed speed is 60 mm/sec during recording and 400 m/s during playback.
m/sec, write frequency 7.65KHz, write power 3.5mW, read power 0.2mW, C/N
The ratio was 47 dB.

Example 4 On the same polyester sheet as in Example 1, an acrylic anchor material was applied to a thickness of 2 pm to form a brimer layer. A compound obtained by reacting acrylic acid with N-methylol acrylamide polymer was applied onto this brimer layer to a thickness of 20 gm to form a resin liquid layer. Using the same master as in Example 2, both were bonded with bubbles. They were brought into close contact so as not to get in, and then they were pressed together at a temperature of 110°C and a pressure of I kg/cm. They were then irradiated with ultraviolet rays under the same conditions as in Example 2 to harden the resin liquid and transfer the pattern. A shakuresin stamper was produced.The pattern transfer rate was 99% in terms of depth, and the transfer of line width and track pitch was 100%, indicating a good pattern transfer rate.Similar to Example 1, the pattern transfer rate was good. No wrinkles were observed on the surface of the base sheet due to transfer.

Next, the same chrome-plated roll as in Example 1 with a diameter of 300
A mmΦ iron roll and the long resin stamper were attached to the same extrusion device as in Example 1, and the same resin as in Example 1 was extruded under the same conditions as in Example 2 to form a pattern.

When the extruded resin substrate was measured in the same manner as in Example 1, the maximum thickness unevenness was 50 μm.
It was small enough. The value of birefringence was 40%m in double pass, and there was little variation. The light transmittance was 89% and it was sufficiently transparent. The amount of surface runout was 50 μm pp, which was sufficiently small. The transfer rate of the preformat pattern formed on the long stamper was 97 to 98% or more in terms of depth. Transfer of line width and track pitch is 99-100%
There was no difference in line width and track pitch in the vertical and horizontal directions in the extrusion direction. Using this board,
After forming an optical recording layer made of the same material as in Example 1,
The same backing as in Example 2 was similarly adhered using the same adhesive. Thereafter, in the same manner as in Example 2, it was cut into card size to produce an optical card. The results of recording and playback show that the card feed speed is 60 mm/sec during recording and 400 m/s during playback.
m/sec, write frequency 7.65KHz, write power 3.5mW, read power 0.2mW, C/N
The ratio was 47 dB.

Example 5 On the same polyester sheet as in Example 1, an acrylic anchor material was applied to a thickness of 2 pm to form a brimer layer. On this brimer layer, a compound obtained by adding 2,4-toluene diisocyanate to a 3=7 copolymer of butyl methacrylate and 2-hydroxyethyl methacrylate is applied to a thickness of 20 μm to form a resin liquid layer. Using the same master as in Example 2, the two were brought into close contact with each other to prevent air bubbles from entering, and the temperature was 110°C and the pressure was I kg/cm.
Pressure contact was carried out under the conditions of Example 2, the resin liquid was cured by irradiation with ultraviolet rays under the same conditions as in Example 2, and the pattern was transferred, thereby producing a long resin stamper. Pattern transfer is 97% deep
The transfer of line width and track pitch was 100%, and the pattern transfer rate was good. As in Example 1, no wrinkles were observed on the surface of the base sheet due to pattern transfer.

Next, the same chrome-plated roll as in Example 1 with a diameter of 300
A mmΦ iron roll and the long resin stamper were attached to the same extrusion device as in Example 1, and the same resin as in Example 1 was extruded under the same conditions as in Example 2 to form a pattern.

When the extruded resin substrate was measured in the same manner as in Example 1, the maximum thickness unevenness was 50 μm.
It was small enough. The value of birefringence was 40% m in double pass, and there was no variation.The light transmittance was 89%, which was sufficiently transparent.The amount of surface deflection was 50 μm, which was sufficiently small.Long stamper. The transfer rate of the pre-format pattern formed in 2008 was 97-98% or more in terms of depth.The transfer rate of line width and track pitch was 99-100%.
There was no difference in line width and track pitch in the vertical and horizontal directions in the extrusion direction. Using this board,
After forming an optical recording layer made of the same material as in Example 1,
The same backing as in Example 2 was similarly adhered using the same adhesive. Thereafter, in the same manner as in Example 2, it was cut into card size to produce an optical card. The results of recording and playback show that the card feed speed is 60) 7 seconds during recording and 400mm during playback.
/second, write frequency 7.65 KHz, write power 3.5 mW, read power 0.2 mW, and the C/N ratio was 49 dB.

Example 6 A resin liquid layer was obtained by reacting N-methylolmelamine and acrylic acid instead of the resin used in Example 5 on a polyester sheet coated with an acrylic anchor material in the same manner as in Example 5. Using N-methylol melamine acrylate, this resin was applied to the same thickness as in Example 5 to form a resin liquid layer, and using the same master as in Example 2, both were brought into close contact to prevent air bubbles from entering. The resin liquid was cured under the same conditions as in Example 5, and the pattern was transferred to produce a long resin stamper. Pattern transfer is 97% deep
The transfer of line width and track pitch was 100%, and the pattern transfer rate was good. As in Example 1, no wrinkles were observed on the surface of the base sheet due to pattern transfer.

Next, the same chrome-plated roll as in Example 1 with a diameter of 300
A mmΦ iron roll and the long resin stamper were attached to the same extrusion device as in Example 1, and the same resin as in Example 1 was extruded under the same conditions as in Example 2 to form a pattern.

When the extruded resin substrate was measured in the same manner as in Example 1, the maximum thickness unevenness was 50 μm.
It was small enough. The value of birefringence was 40% m in double pass, and there was no variation.The light transmittance was 89%, which was sufficiently transparent.The amount of surface deflection was 50 μm, which was sufficiently small.Long stamper. The transfer rate of the pre-format pattern formed in 2008 was 97-98% or more in terms of depth.The transfer rate of line width and track pitch was 99-100%.
There was no difference in line width and track pitch in the vertical and horizontal directions in the extrusion direction. Using this board,
After forming an optical recording layer made of the same material as in Example 1,
The same backing as in Example 2 was similarly adhered using the same adhesive. Thereafter, in the same manner as in Example 2, it was cut into card size to produce an optical card. The results of recording and playback show that the card feed speed is 60 mm/sec during recording and 400 m/s during playback.
m/s, write frequency 7.65MHz, write power 3.5mW, read power 0.2mW, C/N
The ratio was 47 dB.

Example 7 On a polyester sheet coated with an acrylic anchor material in the same manner as in Example 5, a 3=7 combination of butyl methacrylate and 2-hydroxyethyl methacrylate was applied as a resin liquid layer instead of the resin used in Example 5. 2,4 to the polymer
- Using a compound obtained by adding toluene diisocyanate, apply this resin to the same thickness as in Example 5 to form a resin liquid layer, and use the same master as in Example 2 to coat both without bubbles. The resin liquid was cured under the same conditions as in Example 5, and the pattern was transferred to produce a long resin stamper. The pattern transfer rate was good, with a depth of 97% and a line width and track pitch of 100%. As in Example 1, no wrinkles were observed on the surface of the base sheet due to pattern transfer.

Next, the same chrome-plated roll as in Example 1 with a diameter of 300
A mmΦ iron roll and the long resin stamper were attached to the same extrusion device as in Example 1, and the same resin as in Example 1 was extruded under the same conditions as in Example 2 to form a pattern.

When the extruded resin substrate was measured in the same manner as in Example 1, the maximum thickness unevenness was 50 μm.
It was small enough. The value of birefringence was 40 nm in double pass and there was no variation.The light transmittance was 89% and was sufficiently transparent.The amount of surface deflection was 50 μm in pp, which was sufficiently small. Formed on a long stamper. The transfer rate of the preformat pattern was 97-98% or more in terms of depth.The transfer rate of line width and track pitch was 99-100%.
There was no difference in line width and track pitch in the vertical and horizontal directions in the extrusion direction. Using this board,
After forming an optical recording layer made of the same material as in Example 1,
The same backing as in Example 2 was similarly adhered using the same adhesive. Thereafter, in the same manner as in Example 2, it was cut into card size to produce an optical card. The results of recording and playback show that the card feed speed is 60 mm/sec during recording and 400 m/s during playback.
m/sec, write frequency 7.65KHz, write power 3.5mW, read power 0.2mW, C/N
The ratio was 48 dB.

Example 8 The same stamper as in Example 2 was used with a thickness of 10 mm and a stamper of 300 mm.
30 pieces were pasted together without any gaps using an adhesive (Sony Chemical, 5C55) on the X 1000mm. A long polyester sheet of the same size as the pasted stamper was lined with a 10 mm thick glass plate, and a 0.2 mrn vinyl chloride resin spacer was installed. Pour acrylic resin monomer (Kishida Chemical) into it and heat to 130.
C. and a pressure of I kg/cm2 for 15 hours to harden and produce a long resin stamper. The pattern transfer rate was 98% in terms of depth, and 100% in line width and track pitch, indicating a good pattern transfer rate. As in Example 1, no wrinkles were observed on the surface of the base sheet due to pattern transfer.

Next, the same chrome-plated roll as in Example 1 with a diameter of 300
A mmΦ iron roll and the long resin stamper were attached to the same extrusion device as in Example 1, and the same resin as in Example 1 was extruded under the same conditions as in Example 2 to form a pattern.

When the extruded resin substrate was measured in the same manner as in Example 1, the maximum thickness unevenness was 50 μm.
It was small enough. The value of birefringence was 40 nm in double pass, with little variation. The light transmittance was 89% and it was sufficiently transparent. The amount of surface runout was sufficiently small at 50μ fat in pp. The transfer rate of the preformat pattern formed on the long stamper was 97 to 98% or more in terms of depth. Transfer of line width and track pitch is 99-100%
There was no difference in line width and track pitch in the vertical and horizontal directions in the press ratio direction. Using this board,
After forming an optical recording layer made of the same material as in Example 1,
The same backing as in Example 2 was similarly adhered using the same adhesive. Thereafter, in the same manner as in Example 2, it was cut into card size to produce an optical card. The results of recording and playback show that the card feed speed is 60 mm/sec during recording and 400 m/s during playback.
m/s, write frequency 7.65KHz, write power 3.5+nW, read power 0.2mW, C/
The N ratio was 49 dB.

[Effects of the Invention] As explained above, according to the present invention, fine patterns can be formed with high accuracy by molding molten resin using a long resin stamper that is inexpensive and disposable. The advantage is that transparent resin substrates with good flatness can be produced at low cost and in a production process.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the method for manufacturing an optical recording medium substrate of the present invention, FIG. 2 is a partial explanatory diagram thereof, and FIG.
a) and (b) are configuration diagrams showing examples of the long stamper used in the present invention, and FIGS. 4, 5, and 6 (a)
), (b) and FIG. 7 are cross-sectional explanatory diagrams showing a method for manufacturing a long stamper, respectively, FIG. 8 is a schematic diagram showing a method for manufacturing a long resin stamper by the ultraviolet curing resin method of Example 2, and FIG. Figures (a) and (b) are cross-sectional views each showing a conventional optical recording medium. 1... Molten resin 1a... Resin sheet 2.
... Forming roll 3 River pressure roll 4... T die 5 River Ruder 6... Hopper
7... Pick-up roll 8... Long stamper 9...
・Wind ratio roll 10... Winding roll 11・
... Uneven pattern 12 ... Base sheet 13 Kawagen disk 14 ... Resin liquid of ultraviolet curing resin or electron beam curing resin 15 ... Ultraviolet lamp or electron beam source 16 ... Pressure type 17 ... Aging type Resin liquid 18 that has properties...Resin liquid 19 that hardens by reacting with heat, pressure, etc.
...Spacer 20...Backing material 21...
Substrate resin sheet 22... Unwinding roll 23...
・Take-up roll 24...supply roll 25...
Pressure roll 26... Molding resin coating device 27.
... Molding roll 32 ... Track groove 34 ... Spacer 36 ... Protective substrate 31 ... Transparent substrate 33 ... Optical recording layer 35 ... Adhesive layer FIG.

Claims (6)

[Claims] (1) Recording and recording of information by changing optical properties such as reflectance and transmittance by irradiation with a light beam such as a laser beam.
A method of continuously manufacturing a substrate for an optical recording medium to be reproduced by melting a resin, extruding it, and molding it using a roll, which is made of a flexible resin material and has a concave-convex pattern formed on at least one surface. A long stamper having a length equal to or longer than the outer circumference of the roll and the extruded molten resin are heated and pressed together between a pressure roll and a forming roll to form the molten resin to form a transparent substrate with a preformat. 1. A method of manufacturing a substrate for an optical recording medium, comprising: manufacturing a substrate for an optical recording medium. (2) The method for manufacturing an optical recording medium substrate according to claim 1, wherein the long stamper is formed by forming one or more preformat patterns on a long sheet made of a flexible resin material. (3) The long stamper is configured by placing a master disc on which a concave-convex pattern corresponding to the information to be recorded on a long sheet made of a flexible resin material so that it is in close contact with the long sheet. 2. The method of manufacturing an optical recording medium substrate according to claim 1, wherein the preformat pattern is formed by transferring the pattern of the master by heating and pressurizing the substrate while the substrate is being heated. (4) The long stamper uniformly applies an ultraviolet curable resin or an electron beam curable resin between a long sheet made of a flexible resin material and a master disc on which a concavo-convex pattern corresponding to the information to be recorded is formed. 2. The production of an optical recording medium substrate according to claim 1, wherein a preformat pattern is formed by filling the substrate to a certain thickness and bringing them into close contact with each other, and irradiating the substrate with ultraviolet rays or electron beams while they are in close contact to transfer the pattern of the master disk. Method. (5) The long stamper is made of thermoformable ultraviolet curable resin or electron beam between a long sheet made of a flexible resin material and a master disk on which a concavo-convex pattern corresponding to the information to be recorded is formed. Cured resin is filled to a uniform thickness and brought into close contact, and while they are in close contact, heat and pressure is applied to transfer the uneven pattern of the master onto the resin liquid.Then, the resin liquid is irradiated with ultraviolet rays or electron beams. 2. The method of manufacturing a substrate for an optical recording medium according to claim 1, wherein a preformat pattern is formed by curing the substrate. (6) The long stamper is produced by polymerizing by reacting with heat, pressure, etc. between a long sheet made of a flexible resin material and a master disk on which a concavo-convex pattern corresponding to the information to be recorded is formed. 2. The production of an optical recording medium substrate according to claim 1, wherein the preformat pattern is formed by filling a hardening resin to a uniform thickness and bringing it into close contact, and then heating and/or applying pressure to harden the resin liquid. Method.