JPH05189815A - Manufacture of roller for manufacture of substrate for optical recording medium - Google Patents

Abstract

PURPOSE:To manufacture, at low costs, a roller which is used to manufacture an optical recording medium substrate whose pattern accuracy and flatness are good by a method wherein a stamper composed of a resin material is fixed to the outer circumferential part of the roller. CONSTITUTION:One or a plurality of protruding and recessed patterns on an original plate on which the protruding and recessed patterns 3 corresponding to pieces of information to be recorded have been formed are transferred to the surface of a resin sheet; a resin stamper 2 is formed. The resin stamper 2 is fixed to the surface of a roll base material in such a way that the protruding and recessed patterns 3 are faced outward. The original plate is stripped from a hardened resin liquid. When a roller manufactured by this method is used, a substrate, for optical recording medium, whose characteristic is good can be manufactured by conventional method using an extrusion molding resin, ultraviolet curing resin or an electron beam curing resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a roller for manufacturing a substrate for an optical recording medium, and more particularly to a method for manufacturing a roller for manufacturing a transparent substrate of an optical recording medium for optically recording / reproducing information.

[0002]

2. Description of the Related Art Conventionally, magnetic materials such as magnetic tapes and magnetic disks, and various semiconductor memories have been mainly used for recording various information. Such magnetic memory and semiconductor memory have an advantage that information can be easily written and read, but on the other hand, there are problems that the contents of information are easily tampered with and high-density recording cannot be performed. .. In order to solve such a problem, an optical information recording method using an optical recording medium has been proposed as a means for efficiently handling various kinds of information, and an optical information recording carrier, a recording / reproducing method, and a recording / reproducing apparatus therefor are proposed. Has been done.

Such an optical recording medium as an information recording carrier generally uses a laser beam to volatilize a part of the optical recording layer on the information recording carrier, cause a change in reflectance, or cause deformation. Then, information is recorded or reproduced by a difference in optical reflectance or transmittance. In this case, the optical recording layer is a so-called DRAW (direct read after write) medium that can be “directly read after writing” without requiring development processing after writing information, and high density recording is possible. Moreover, since additional writing is possible, it is effective as a recording / storing medium of information.

9A and 9B are schematic sectional views of a conventional optical recording medium (optical disk, optical card).
9A shows a disk-shaped optical recording medium, and FIG. 9B shows a card-shaped optical recording medium. In FIG. 9, 31 is a transparent substrate, 32 is a track groove portion, 33 is an optical recording layer, 34 is a spacer, 35 is an adhesive layer, and 36 is a protective substrate. Figure 9
In information recording / reproducing, information is optically written and read through the transparent substrate 31 and the track groove portion 32. At this time, tracking can be performed by the phase difference of the laser light by utilizing the fine unevenness of the track groove portion.

In conventional video discs, audio discs, etc., a thermoplastic resin such as polyvinyl chloride resin (PVC) or polycarbonate resin (PC) is heated and pressed by a molding roll on which information is recorded, or information or preformat is applied. The substrate is continuously molded by transferring the pattern (Japanese Patent Laid-Open No. 56-86721). Alternatively, as another method, there is also used a method of molding a sheet by using an injection molding method.

As a method for producing a forming roll for continuous forming, a method of directly forming a pattern on the roll and a method of producing a stamper (coma) on which a sheet-shaped pattern is formed and using an adhesive or the like to form the roll A method of fixing by a method such as adhesion (Japanese Patent Publication No. 50-11518), and a method of fixing a single-wafer stamper to a roll by magnetic force, adsorption, or a mechanical method (Japanese Utility Model Publication No. 53-15825, Japanese Utility Model Publication No. Sho. 50-9568 and Japanese Utility Model Laid-Open No. 57-164839) are used. In addition, a method for manufacturing a CD and a CD-ROM using a resin type UV curable resin has been proposed. (WO88 / 03311) However, unlike the conventional methods of the video disc and the audio disc as described above, an optical recording medium such as an optical disc and an optical card / optical tape has a finer pattern accuracy than the audio disc. Therefore, it is necessary to use a photolithography-related device such as a laser drawing device.

In the method of directly forming the pattern on the roll, the surface accuracy of the roll can be processed with high accuracy, but it is difficult to accurately draw or transfer the pattern on the surface of the cylindrical roll. Has occurred.
In addition, in general, since a pattern is directly formed on a roll made of a metal material, there is a problem that the roll must be replaced when the surface of the metal roll becomes dirty or scratched. There is also a problem that the manufacturing cost of one piece is high.

In the method of manufacturing a single-sheet stamper and fixing it to a roll by a method such as adhesion, a stamper can be prepared for each individual sheet, and thus a flat stamper can be prepared using photolithography. It is possible to fabricate with high pattern accuracy. The obtained single-wafer stamper is fixed to the roll surface by using an adhesive or a mechanical fixing method.However, since these stampers are generally formed of a metal material, the stamper is placed along the roll. Since it is necessary to perform bending and then bonding, it is difficult to work along the curved surface of the roll exactly, and the surface accuracy of the roll will deteriorate unless it is fitted exactly to the curved surface of the roll. There is a problem. In addition, since the single-wafer stamper is manufactured by using photolithography, there are problems that the number of steps is large and the productivity is not good, and thus the manufacturing cost is high.

In any of the methods, if the surface accuracy of the roll stamper to be molded is poor or uneven, the extruded resin will not be sufficiently pressurized during molding,
There are problems that a fine pattern is not transferred accurately and that the thickness of the substrate becomes uneven within the surface of the disk. In addition, the unevenness of the pressure at the time of molding appears as the unevenness of the birefringence when the resin such as polycarbonate is used, and the quality deteriorates.

[0010]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above problems, and provides at low cost a roller capable of manufacturing an optical recording medium substrate having good pattern accuracy and flatness. The purpose is that.

[0011]

That is, the present invention is to manufacture an optical recording medium in which optical characteristics are changed by irradiation of a light beam to record / reproduce information, and molding is performed using a roller-shaped mold. In a method for manufacturing a roller that sequentially forms a transparent substrate with a preformat, the uneven pattern of the master on which the uneven pattern corresponding to the information to be recorded is formed is transferred to the surface of the resin sheet. And a step of forming the resin stamper on the surface of the roll substrate with the concavo-convex pattern on the outside, and a step of forming the resin stamper. Further, the first feature of the roller manufacturing method of the present invention is a step of applying a resin liquid which is cured by radiation such as ultraviolet rays or electron beams onto a master having an uneven pattern corresponding to information to be recorded.
If necessary, the step of heating and leveling the resin solution so that the thickness of the resin solution becomes uniform, the base sheets made of resin are combined so that air bubbles do not enter the applied resin solution, and the resin solution is placed between them. The step of filling, the step of pressurizing the resin liquid so that the thickness of the resin liquid becomes uniform if necessary, and the resin liquid is cured by irradiating the applied resin liquid with radiation such as ultraviolet rays or electron beams to make the master disk uneven. The point is that the step of transferring the pattern to the resin liquid, the step of peeling the cured resin liquid from the master, and the step of fixing the resin liquid peeled from the master together with the base sheet to the roller are performed.

A second feature of the roller manufacturing method of the present invention is that a base sheet made of a thermoplastic resin or a thermosetting resin is brought into close contact with a master having an uneven pattern corresponding to information to be recorded. Step, heating and pressing the base sheet in close contact with the master to transfer the uneven pattern of the master to the base sheet, peeling the base sheet from the master, fixing the base sheet peeled from the master to the roller The point is that the process is performed.

Further, a step of providing a resin layer having good moldability on the base sheet, if necessary, a step of adhering the base sheet provided with the molding resin layer to a master, and a step of adhering the base sheet to the master. The steps are to heat and press as it is to transfer the uneven pattern of the master onto the base sheet, to peel the base sheet from the master, and to fix the base sheet peeled from the master to the rollers.

The third feature of the roller manufacturing method of the present invention is that it is cured by radiation such as ultraviolet rays or electron beams on a master having an uneven pattern corresponding to information to be recorded, and has thermoformability. A step of applying a resin liquid having the above to form a layer of the resin liquid, a step of heating and leveling the resin liquid layer so that the thickness of the resin liquid layer becomes uniform if necessary, and preventing bubbles from entering the applied resin liquid layer In addition, a step of combining a base sheet made of resin, a step of applying pressure so that the thickness of the resin liquid layer becomes uniform if necessary, and a base sheet coated with the resin solution is heated and pressed while being in close contact with the master. The step of transferring the concavo-convex pattern of the master onto the resin liquid layer on the base sheet, irradiating the resin liquid layer on the base sheet with radiation such as ultraviolet rays or an electron beam to cure the concavo-convex pattern of the master onto the resin liquid layer. Step of transferring, the step of stripping the resin solution layer on the cured base sheet from the master, there resin liquid layer on the base sheet was peeled from the master in that to perform the step of fixing the roller.

The fourth characteristic of the method for manufacturing a roller of the present invention is that a resin liquid which reacts by heat, pressure, etc. to polymerize and harden on a master on which an uneven pattern corresponding to information to be recorded is formed. The step of applying, the step of filling the resin solution between the backing materials by opening a gap of a certain size so that air bubbles do not enter the applied resin solution, and the thickness of the resin solution as necessary. So that the resin liquid is cured by heating or / and pressurizing the resin liquid so as to obtain a uniform pattern, and the uneven pattern of the master is transferred to the resin liquid; the step of peeling the cured resin liquid from the master; the resin peeled from the master The point is that the step of fixing the liquid to the roller together with the base sheet is performed.

The fifth feature of the roller manufacturing method of the present invention is that radiation or heating such as ultraviolet rays or electron beams is applied on a flexible master or / and roller on which an uneven pattern corresponding to information to be recorded is formed. , A step of applying a curable resin liquid under pressure, a step of leveling the resin liquid so that the thickness of the resin liquid becomes uniform if necessary, and A step of filling a flexible master and a roller together to fill the resin between them, a step of applying pressure so that the thickness of the resin liquid becomes uniform if necessary, a master and a roller filled with the resin liquid, and a master, The step of transferring the concave-convex pattern of the master to the base sheet, and the resin liquid filled between the master and the roller is cured by applying radiation such as ultraviolet rays or electron beams, heat, or pressure to cure the master surface. Certain over down step of fixing by transferring the liquid resin of the resin solution on the roller surface, in that to perform the step of stripping the stamper from the cured resin solution.

The present invention will be described in detail below. The present invention is an optical recording medium that records and reproduces information by changing optical characteristics such as reflectance and transmittance by irradiation with a light beam such as a laser beam, and molding is performed using a roller-shaped mold. In a method of manufacturing an optical recording medium in which a transparent substrate with a preformat is continuously formed, a resin stamper (resin material layer) having one or a plurality of concavo-convex patterns corresponding to information to be recorded is formed on the outer peripheral surface. A method for manufacturing a roller for manufacturing a substrate for an optical recording medium having the above. By using the roller of the present invention, a good optical recording medium substrate can be obtained at low cost by the extrusion molding method and the ultraviolet or electron beam curing resin method shown in FIGS.

The present invention will be described below with reference to the drawings.
FIG. 1 is a schematic sectional view showing an embodiment of a roller for producing a substrate for an optical recording medium produced by the method of the present invention. As shown in FIG. 1, a resin stamper 2 is formed on the outer peripheral surface of the molding roller 1, and an uneven pattern 3 is formed on the resin stamper 2.

2 to 5 are explanatory views showing a method for producing a resin stamper used in the roller for producing a substrate for an optical recording medium of the present invention. In the present invention, the method of manufacturing the resin stamper 2 has four types shown in FIGS. Whichever method is used, the resin stamper 2 of the present invention has one or a plurality of patterns formed on a base sheet 5 made of a flexible material.

As shown in FIG. 2, the first method of manufacturing the resin stamper 2 of the present invention manufactures the resin stamper through the following series of steps. A resin liquid 6 that is cured by radiation such as ultraviolet rays or electron beams is applied onto a master 4 on which an uneven pattern corresponding to information to be recorded is formed. If necessary, heating leveling is performed so that the resin liquid has a uniform thickness. The base sheet 5 made of a resin is put together so that air bubbles do not enter the applied resin liquid, and the resin liquid is filled between them. If necessary, pressure is applied so that the resin liquid has a uniform thickness. The applied resin solution is irradiated with radiation such as ultraviolet rays or electron beams as necessary to cure the resin solution and transfer the concavo-convex pattern of the master to the resin solution. The step of peeling the cured resin liquid from the master, and fixing the resin liquid peeled from the master together with the base sheet to the roller. The resin cured in this way undergoes three-dimensional cross-linking curing, and therefore has high heat resistance and solvent resistance.

The master 4 in the present invention is generally a CD.
(Compact disc) can be created by the manufacturing method used. Specifically, a resist is applied to a glass master, a pattern is exposed and developed, nickel is sputtered to form a film, and electroforming is performed to deposit nickel to a predetermined thickness. The second master thus obtained may be used as a father to create a third master (mother) and a grandchild stamper.

As another method, a pattern is formed on a rigid substrate by a method such as photolithography, and the pattern is used as a resist to form a pattern on the rigid substrate by wet or dry etching to a required depth. A method of forming a groove can also be used.

In the first manufacturing method of the present invention, the thickness of the master 4 is set so that the base sheet 5 can be patterned by filling the space between the master 4 and the base sheet 5 with an ultraviolet or electron beam curing resin. Since it is used, the thickness is such that the mechanical strength and durability required for processing methods such as application of ultraviolet or electron beam resin, leveling, transfer, curing and peeling are obtained. The thickness of the master is preferably 10 μm to 20 mm, and particularly preferably 0.
1-1 mm is preferable. If necessary, a hardened film of titanium nitride or the like, or a protective layer of silicon or the like can be formed on the surface of the master 4. If necessary, a protective layer may be lined on the back surface of the master 4.

The base sheet 5 may be made of any material as long as it is flexible and has sufficient heat resistance, ultraviolet resistance, mechanical strength and flexibility in resin molding. it can. For example, a polymer or copolymer film of polyethylene terephthalate, polyethylene, polycarbonate, polystyrene, polyvinyl butyral, polyimide polymethyl methyl methacrylate, polyvinyl chloride, polyethylene, polystyrene, polyolefin, epoxy resin or the like is suitable. Metals or metal compounds such as nickel and chromium, metal alloys, glass, ceramics and the like can be mixed and mixed therewith. It is also possible to form a protective layer on the opposite side of the pattern surface of the base sheet or to attach a backing material.

As the ultraviolet curable resin or electron beam curable resin used in the present invention, a prepolymer, an oligomer or a monomer having an unsaturated bond in the molecule can be used. For example, unsaturated polyesters, acrylates such as epoxy acrylate, urethane acrylate, and polyether acrylate, epoxy methacrylate,
A mixture of one or more methacrylates such as urethane methacrylate, polyether methacrylate, polyester methacrylate, and a monomer or functional compound having an unsaturated bond in the molecule, or if necessary, a sensitizer, etc. Can be used.

As a coating method of these resin liquids, a known method can be used. For example, roll coating, knife coating, bar coating, gravure coating, screen printing and the like can be used. A primer layer made of an anchor material may be provided in order to enhance the adhesion between the base sheet 5 and the resin stamper 2. Master 4 and base sheet 5
Before curing, 0.1 kg between the two
/ Cm ² or more, preferably, a pressure of 1 kg / cm ² is applied. Further, a metal layer may be provided on the cured resin stamper 2 if necessary. The metal used includes aluminum, gold, silver, chromium, nickel and the like. As the method for producing the metal layer, vapor deposition, sputtering, ion plating, plating, or the like can be used.

In addition, the resin stamper 2 and the roller 1
It is also possible to make it larger than the size to be fixed to, punch out the outside, and cut by a method such as bite processing. The method shown in the manufacturing method 1 may be performed a plurality of times on one base sheet 5 to form a large number of concavo-convex patterns 3.

The roller 1 may be made of any material as long as it has high hardness and good thermal conductivity. For example, metals such as iron and chrome steel, metal alloys, metal compounds, glass, Ceramics or the like can be used. The roller surface is processed by derusting, degreasing, removing water and polishing. The surface accuracy needs to be substantially the same as or better than the surface accuracy of the optical recording medium to be molded. The preferred surface accuracy is 1 S or less, and the more preferred surface accuracy is 0.1 S or less. If necessary, a hardened film of titanium nitride or the like, a protective layer of silicon or the like can be formed on the surface, or plating such as chrome plating can be applied.

The method of fixing the resin stamper 2 to the roller 1 provides the surface accuracy required for molding the resin,
Any method can be used as long as it does not cause displacement during fixing or molding. For example, a method such as mechanical fixing such as screwing, adhesion using an adhesive or a pressure sensitive adhesive, and fitting / tightening can be used. Also, if necessary, resin stamper 2 and roller 1
A sheet of metal or the like may be sandwiched between them. Further, a notch or uneven portion for alignment may be provided on the roller or the like.

When the resin stamper 2 has a seam, it is necessary that the ends of both the resin stampers 2 are closely aligned at the seam to avoid a step. When the adhesive is used, it is necessary to prevent the gap between the joints of the resin stamper 2 and the protrusion of the adhesive due to the curing shrinkage of the adhesive.

The second method of manufacturing the resin stamper of the present invention is a method of manufacturing the resin stamper 2 through the following series of steps as shown in FIG. A base sheet 5 made of a thermoplastic resin or a thermosetting resin is brought into close contact with the master 4 on which an uneven pattern corresponding to information to be recorded is formed. While heating the base sheet 5 in close contact with the master 4,
Pressurize to transfer the uneven pattern of the master onto the base sheet. After the base sheet 5 is cooled, the base sheet is peeled off from the master 4. The base sheet peeled from the master is fixed to the roller.

The master 4 can be manufactured by a manufacturing method generally used for CDs (compact discs) and the like as in the first manufacturing method. In the second manufacturing method of the present invention, since the base sheet 5 is sandwiched between the master 4 and the pressure die 8 to heat and press the base sheet 5 to process a pattern on the base sheet 5, The material and thickness are such that the mechanical strength and durability required for the processing methods such as heating, pressing and peeling are obtained. As the material to be used, as in the first manufacturing method, metals and metal compounds, ceramics, glass and the like are preferable, and the thickness range is 10 μm to 2
0 mm is preferable, and 0.1-10 mm is particularly preferable.
If necessary, a hardened film of titanium nitride or the like, or a protective layer of silicon or the like can be formed on the surface of the master 4 or the pressure die 8. Further, a protective layer may be lined on the back surface of the master 4 or the pressure die 8 as needed.

The base sheet 5 is a material which is flexible and capable of forming a concavo-convex pattern by heating and pressurization, and is a material having sufficient heat resistance, ultraviolet resistance and mechanical strength in resin molding. Any material can be used. For example, a material similar to that of the first manufacturing method can be used. Polymer or copolymer films of polyethylene terephthalate, polyimide polymethyl methyl methacrylate, polyvinyl chloride, polyethylene, polystyrene, polyolefins, epoxy resins and the like are suitable. Similar to the first manufacturing method, a mixture or a protective layer or a backing layer may be added.

The temperature at which the base sheet 5 is molded according to the present invention depends on the material used, but the temperature at which it is applied may be at or above the Tg point, but is preferably 80 ° C. or higher, more preferably 100 ° C. or higher. The applied pressure is preferably 0.1 kg / cm ² or more, and more preferably 1.0 kg / cm ² or more.

Further, as in the first method, a metal layer may be provided on the cured resin stamper 2 if necessary. Besides, it is possible to cut the outer peripheral portion by making the resin stamper 2 larger than the size for fixing the resin stamper 2 to the roller 1. Similar to the method shown in the manufacturing method 1, a large number of concavo-convex patterns 3 may be prepared by performing the same process on one base sheet 5 a plurality of times. As the roller 1, the same one as in the first manufacturing method can be used. The method of fixing the resin stamper 2 to the roller 1 may be the same as that of the first manufacturing method.

The third method of manufacturing the resin stamper of the present invention is a method of manufacturing the resin stamper 2 through the following series of steps as shown in FIG. A resin liquid 6a, which is hardened by radiation such as ultraviolet rays or electron beams and has thermoformability, is applied onto the master 4 on which an uneven pattern corresponding to the information to be recorded is formed to form a resin liquid layer. If necessary, heating leveling is performed so that the resin liquid has a uniform thickness.

The base sheet 5 made of resin is put together so that air bubbles do not enter the applied resin liquid layer. If necessary, pressure is applied so that the resin liquid layer has a uniform thickness. The base sheet coated with the resin liquid is heated and pressed while closely adhering to the master disc to transfer the uneven pattern of the master disc onto the resin liquid layer on the base sheet (see FIG. 4A). The resin liquid layer applied on the base sheet is irradiated with radiation such as ultraviolet rays or electron beams as necessary to cure the resin liquid layer and transfer the concavo-convex pattern of the master to the resin liquid layer (see FIG. 4B). A step of peeling the resin liquid layer 6b on the cured base sheet from the master,
The resin liquid layer on the base sheet separated from the master is fixed to a roller.

The master 4 can be manufactured by the manufacturing method generally used for CDs (compact discs) and the like as in the first manufacturing method. In the third manufacturing method of the present invention, the base plate 5 is sandwiched between the master plate 4 and the pressure die 8 to heat and press to process 5 patterns on the base sheet. The material and thickness are such that the mechanical strength and durability required for the processing method used, such as heating, pressing and peeling, are obtained. As the material to be used, metals and metal compounds, ceramics, glass and the like are preferable as in the first manufacturing method, and the thickness range is 10 μm.
m to 20 mm is preferable, and 0.1 to 10 mm is particularly preferable. If necessary, a hardened film of titanium nitride or the like, or a protective layer of silicon or the like can be formed on the surface of the master 4 or the pressure die 8. If necessary, the master 4 or the pressurizing mold 8
It is also possible to line a protective layer on the back side of the.

The base sheet 5 is a material which is flexible and capable of forming a concavo-convex pattern by heating and pressurizing, and is a material having sufficient heat resistance, ultraviolet resistance and mechanical strength in resin molding. Any material can be used. For example, the same material as in the first manufacturing method can be used. Polyethylene terephthalate, polyimide polymethyl methyl methacrylate, polyvinyl chloride,
Polymer or copolymer films of polyethylene, polystyrene, polyolefins, epoxy resins and the like are suitable. Similar to the first manufacturing method, a mixture or a protective layer or a backing layer may be added.

The resin liquid layer on the base sheet 5 in the present invention is a resin which has thermoformability and is cured by ultraviolet rays or electron beams. Base sheet 5 that is solid at room temperature
It is also possible to wind up the base sheet 5 as a single sheet by applying it on. As such a material, there is a thermoforming substance having a radically polymerizable unsaturated group as described below.

(1) A polymer having a radically polymerizable unsaturated group in a polymer having a glass transition temperature of 0 to 250 ° C. More specifically, as a polymer, a radical-polymerizable unsaturated group is introduced by the methods (a) to (d) described below, in which the following compounds are polymerized or copolymerized.

Monomers having hydroxyl groups: N-methyl acrylamide, 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 having a carboxyl group: acrylic acid, methacrylic acid, acroyloxyethyl monosuccinate and the like. Monomers having epoxy groups: Glycidyl methacrylate, etc. Monomers having an aziridinyl group: 2-aziridinylethyl methacrylate, allyl 2-aziridinyl europionate and the like.

Monomers having amino groups: acrylamide, methacrylamide, diacetone acrylamide, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate and the like. Monomers having sulfone groups: 2-acrylamido-2-methylpropanesulfonic acid, etc. Monomers having isocyanate group: 1,4-toluene diisocyanate and 2-hydroxyethyl acrylate, such as an adduct of 1 mole to 1 mole of diisocyanate and a radical-polymerizable monomer having active hydrogen.

Further, in order to adjust the glass transition point of the copolymer or the physical properties of the cured film,
It is also possible to copolymerize the above compound with the following monomers copolymerizable with this compound. Examples of such a copolymerizable monomer 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-methylol melamine 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, whereby the material according to the present invention is obtained. Obtainable.

(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 a monomer having a carboxyl group or a sulfone group, the above-mentioned monomer having a hydroxyl group is subjected to a condensation reaction. (C) In the case of a polymer or copolymer of a monomer having an epoxy group, an isocyanate group, or an aziridinyl group, the above-mentioned monomer having a hydroxyl group or a 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 unit amount An addition reaction is carried out with 1 mol to 1 mol of the adduct of the body.
In order to carry out the above reaction, it is preferable to add a trace amount of a polymerization inhibitor such as hydroquinone and to carry out the reaction with dry air.

(2) Another material that can be used in the present invention as a thermoformable resin 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, cyclohexanediol dimethacrylate, spiroglycol dimethacrylate, and spiroglycol diacrylate. Such a radical-polymerizable unsaturated monomer improves the cross-linking density and heat resistance upon irradiation with ionizing radiation, and in addition to the above-mentioned monomers, ethylene glycol diacrylate and ethylene glycol diacrylate. 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, dipe Data 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, sorbitol tetradiglycidyl ether methacrylate, and the like can be used, and the solid content of 100 parts by weight of the above-mentioned copolymer mixture is 0. Used in a proportion of 1 to 100 parts by weight Door is preferable.

Although the above-mentioned materials can be sufficiently cured by electron beams, when they are cured by ultraviolet rays,
As the sensitizer, benzoquinone, benzoin, benzoin ethers such as benzoin methyl ether, halogenated acetophenones, peeryls and the like which generate radicals by irradiation with ultraviolet rays can also be used.

The molding conditions for this resin liquid layer are that the heating temperature is
Preferably 50 to 300 ° C, more preferably 100 to 2
It is preferably 00 ° C or higher. The applied pressure is 0.1 kg / cm
² or more is preferable, and 1.0 kg / cm ² or more is preferable. Further, as in the first method, a metal layer may be provided on the cured resin stamper 2 as needed. Besides, it is also possible to cut the outer peripheral portion by making the resin stamper 2 larger than the size for fixing the resin stamper 2 to the roller 1. Similar to the method shown in the manufacturing method 1, a plurality of concave / convex patterns 3 are formed on one base sheet 5 a plurality of times.
Is also good to make.

As the roller 1, the same one as in the first manufacturing method can be used. The method of fixing the resin stamper 2 to the roller 1 may be the same as that of the first manufacturing method.

The fourth method for producing the resin stamper 2 of the present invention is a method for producing the resin stamper 2 through the following series of steps as shown in FIG. A resin liquid 6c which reacts with heat and pressure to polymerize and cure is applied onto the master 4 on which an uneven pattern corresponding to the information to be recorded is formed.
In order to prevent air bubbles from entering the applied resin liquid, a gap of a certain size is opened, the backing materials 10 are aligned, and the resin liquid is filled between them. If necessary, the resin liquid is cured by heating or / and pressurizing so that the resin liquid has a uniform thickness, and the concavo-convex pattern of the master is transferred to the resin liquid. The cured resin liquid 6c is peeled off from the master 4. The resin liquid peeled from the master is fixed to the roller.

The master 4 can be manufactured by a manufacturing method generally used for CDs (compact discs) and the like as in the first manufacturing method. With respect to the material and thickness of the master 4, in the fourth manufacturing method of the present invention, the resin liquid is sandwiched between the master 4 and the backing material 10 via the spacer 9 to heat and pressurize the resin liquid for polymerization. Harden or pour a resin solution between the master 4 and the backing material 10 via a spacer 9,
In order to remove the solvent, the material and thickness are selected so as to obtain the mechanical strength and durability required for a series of processing methods such as heating, pressurizing and peeling. As the material to be used, metals and metal compounds, ceramics, glass and the like are preferable as in the first manufacturing method, and the thickness range is 10 μm.
m to 20 mm is preferable, and 0.1 to 10 mm is particularly preferable. If necessary, a hardened film such as titanium nitride or a protective layer such as silicon can be formed on the surface of the master 4 or the backing material 10. If necessary, a protective layer can be lined on the back surface of the master 4 or the pressure die 8.

The backing material 10 is heat and solvent resistant enough to be filled with a resin liquid between the master 4 and heated and / or pressurized to cure the resin liquid for molding. Any material having mechanical strength can be used. For example, the same metal, metal compound, glass, ceramics, etc. as the master 4 can be used. The thickness can be used similarly to the master 4.

As the spacer 9, any material can be used as long as it can fix the master 4 and the backing material 10 with a certain gap. The same metal, metal compound, glass, ceramics, polyvinyl chloride, polyethylene terephthalate, or other resin as the master 4 can be used. The thickness of the spacer depends on the thickness of the resin stamper to be manufactured, but is preferably 10 μm to 20 mm, particularly 0.1 to 10 mm.
mm is preferred.

As the resin liquid used to form the resin stamper 2, any resin or a monomer thereof can be used as long as it is a resin which can be cured by heating, pressurizing, ultraviolet rays or electron beams. For example, polymethyl methyl methacrylate, epoxy, etc. can be used. Alternatively, a resin that can be dissolved in a solvent and then cured after removing the solvent can be used. For example, polymers or copolymers of polyethylene terephthalate, polyethylene, polycarbonate, polystyrene, polyvinyl butyral, polyimide polymethyl methyl methacrylate, polyvinyl chloride, polyethylene, polystyrene, polyolefin, epoxy resin and the like can be used.
Optimum molding conditions for the resin liquid layer are selected according to the type of resin used. Further, as in the first method, a metal layer may be provided on the cured resin stamper 2 as needed.

In addition, the resin stamper 2 and the roller 1
It is also possible to cut the outer periphery by making it larger than the size to be fixed to. As the roller 1, the same one as in the first manufacturing method can be used. Resin stamper 2
The same method as in the first manufacturing method can be used to fix the roller to the roller 1.

The fifth method for producing the resin stamper 2 of the present invention is a method for producing the resin stamper 2 through the following series of steps as shown in FIG. A flexible master 4a or / or an uneven pattern corresponding to the information to be recorded is formed.
Then, the resin liquid 6d having a curability is applied onto the roller 1 by radiation such as ultraviolet rays or electron beams, or by heating or pressurization. If necessary, heating leveling is performed so that the resin liquid has a uniform thickness. Align the flexible master 4a and the roller 1 so that air bubbles do not enter the applied resin liquid,
The resin is filled in between. If necessary, pressure is applied so that the resin liquid 6d has a uniform thickness. The master 4a filled with the resin liquid 6d and the roller are brought into close contact with each other, and the concavo-convex pattern of the master is transferred to the base sheet. The resin liquid filled between the master and the roller is cured by applying radiation such as ultraviolet rays or electron rays, heat or pressure as necessary to transfer the uneven pattern of the master to the resin liquid and fix the resin liquid on the roller surface. .. The master is separated from the cured resin liquid.

The flexible master 4a can be manufactured by a manufacturing method generally used for CDs (compact discs) and the like as in the first manufacturing method. In the fifth manufacturing method of the present invention, the material and thickness of the flexible master 4a are such that the resin liquid is sandwiched between the flexible master 4a and the roller 1 and heated and pressurized to polymerize the resin liquid. In order to cure or pour a solution of resin between the flexible master 4a and the roller 1 to remove the solvent, a series of processes such as UV or electron beam irradiation, heating, pressing, peeling, etc. Use a material and thickness that will provide the mechanical strength and durability required for the method. As the material to be used, like the first manufacturing method, metals and metal compounds, ceramics, glass, resins and the like are preferable,
The thickness range is preferably 10 μm to 20 mm, particularly preferably 0.1 to 10 mm.

In particular, the master 4a needs to have flexibility in order to set the flexible master 4a along the roller 1 to cure the resin liquid. If necessary, a hardened film of titanium nitride or the like, or a protective layer of silicon or the like can be formed on the surface of the flexible master 4a. Further, a protective layer may be formed on the back surface of the master 4 if necessary. In addition, a protective layer can be lined on the back surface of the flexible master 4a, if necessary. In addition, a spacer may be interposed between the roller 1 and the flexible master 4a, if necessary.

The resin liquid used to form the resin stamper 2 may be any resin or a monomer thereof as long as it is a resin that can be cured by heating, pressurizing, ultraviolet rays or electron beams. For example, polymethyl methyl methacrylate, epoxy, etc. can be used.
Alternatively, a resin that can be dissolved in a solvent and then cured after removing the solvent can be used. For example, polymers or copolymers of polyethylene terephthalate, polyethylene, polycarbonate, polystyrene, polyvinyl butyral, polyimide polymethyl methyl methacrylate, polyvinyl chloride, polyethylene, polystyrene, polyolefin, epoxy resin and the like can be used. Optimum molding conditions for the resin liquid layer are selected according to the type of resin used. Also, the first
In the same manner as in the above method, a metal layer may be provided on the cured resin stamper if necessary.

In addition, the resin stamper 2 and the roller 1
It is also possible to cut the outer periphery by making it larger than the size to be fixed to. As the roller 1, the same one as in the first manufacturing method can be used.

By using the roller manufactured by the method of the present invention, it is possible to inexpensively manufacture a substrate for an optical recording medium having excellent characteristics by a conventional extrusion molding method or a method using an ultraviolet / electron beam curing resin. The obtained substrate for an optical recording medium can be provided with an optical recording layer or a reflective layer, and if necessary, a protective layer or the like to form an optical recording medium. As these methods or materials, those generally used for optical recording media can be freely selected and used. The roller of the present invention can be used for manufacturing all kinds of optical recording media such as optical disks, optical cards, optical tapes, optical coins and the like.

[0064]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.

Example 1 A photoresist was applied on a glass plate, a pattern was formed by a laser exposure machine, and then publicly known conductive treatment and electroforming were carried out to obtain a pitch of 1.6 μm and a width of 0.6 μm. Depth 700
A nickel master (thickness: 300 μm) having a diameter of 130 mm and having a continuous groove of Å was prepared. The master was lined with 2 mm of chrome steel, and an ultraviolet curable resin (APR, manufactured by Asahi Kasei Kogyo KK) was applied thereon to a thickness of 50 μm using a screen printing method. As a base film, a 100 μm thick polyester film (Lumirror, manufactured by Toray Industries, Inc.) is placed on the base film, and ultraviolet rays are irradiated from the side of the base film using an ultra-high pressure mercury lamp at 80 W / cm for a distance of 10 cm to remove the resin liquid. The pattern was transferred by curing. The cured resin liquid was peeled off from the master together with the base film.

100% transfer of line width and track depth
And (measured by Elionix, surface profilometer),
The pattern transfer rate was good. Moreover, wrinkles on the surface of the base sheet due to the transfer of the pattern were not observed.

The surface was plated with chrome to a thickness of 1 μm,
A small amount of epoxy resin (Diabond 2000S, manufactured by Nozawa Chemical Co., Ltd.) and diethylenetriamine (manufactured by Kishida Chemical Co., Ltd.) as a curing agent were added to an iron roll with a roll diameter of 300 mmφ and mixed uniformly, and a roller uniformly formed a thickness of 20 μm. Applied. A base sheet having a resin layer formed thereon was attached to the outer circumference of the roller from one end.

Example 2 Instead of the ultraviolet curable resin used in Example 1, an electron beam curable resin liquid (urethane acrylate [Nippon Gosei Co., Ltd., XP
700B]: Oligoester acrylate [Toagosei Co., Ltd., Aronix M7300] = 30 parts by weight: 70 parts by weight) and curing conditions were electron beam 180 KeV, 10 Mr.
The resin liquid was cured in the same manner as in Example 1 except that the resin solution was irradiated with ad. It was attached to a roller in the same manner as in Example 1.

Example 3 Using the same master as in Example 1, backing was performed in the same manner as in Example 1, and a polycarbonate having a thickness of 200 μm (Panlite 202, manufactured by Teijin Chemicals Ltd.) was used between 2 mm of chrome steel. Then, the pattern was transferred by applying a pressure of 10 kg / cm ² at 200 ° C. with heating for 2 minutes. After cooling to room temperature, the resin was peeled off from the master. The transfer of line width and track depth was 95%, and the pattern transfer rate was good. Moreover, wrinkles on the surface of the base sheet due to the transfer of the pattern were not observed. It was attached to a roller in the same manner as in Example 1.

Example 4 The same 100 μm thick polyester film as in Example 1 was used as a base film, and an acrylic anchor material was applied thereon to a thickness of 2 μm to form a primer layer. On this primer layer, a compound obtained by reacting N-methylol acrylamide polymer with acrylic acid was formed to a thickness of 20 μm.
m as a resin liquid layer, the same master as in Example 1 was used to bring them into close contact with each other without causing bubbles, and the temperature was set to 11
The pattern was transferred by pressing under the conditions of 0 ° C. and a pressure of 1 kg / cm ² and irradiating ultraviolet rays under the same conditions as in Example 1 to cure the resin liquid. 97% transfer of line width and track depth
And the pattern transfer rate was good. Moreover, wrinkles on the surface of the base sheet due to the transfer of the pattern were not observed. It was attached to a roller in the same manner as in Example 1.

Example 5 N-methylolmelamine acrylate obtained by reacting N-methylolmelamine with acrylic acid was used as a resin liquid layer in place of the resin used in Example 4, and molding was carried out under the same conditions as in Example 4. , Cured. A resin layer having the same pattern accuracy as in Example 4 could be obtained. It was attached to a roller in the same manner as in Example 1.

Example 6 A compound obtained by adding 2,4-toluene diisocyanate to a 3: 7 copolymer of butyl methacrylate and 2-hydroxyethyl methacrylate as a resin liquid layer instead of the resin used in Example 4. Was molded and cured under the same conditions as in Example 4. A resin layer having the same pattern accuracy as in Example 4 could be obtained. It was attached to a roller in the same manner as in Example 1.

Example 7 Using the same backing master as in Example 1, a 2 mm thick glass plate was placed via a spacer of 0.2 mm thick vinyl chloride resin. Acrylic resin monomer (manufactured by Kishida Chemical Co., Ltd.) was poured into it, and temperature was 130 ° C., pressure was 1 kg / c
It was pressed and cured under the condition of m ² for 15 hours. When peeled from the master and measured, transfer of line width and track depth is 9
The pattern transfer rate was 8%, which was good. Example 1
I stuck it on the roller in the same way.

Example 8 In the same manner as in Example 1, a master having a thickness of 100 μm was produced.
The same primer layer as in Example 4 was formed on the surface of the same roller as in Example 1 as in Example 4. The same 0.2 mm thick vinyl chloride resin spacer as in Example 7 was sandwiched and fixed between the master and the roller. The same acrylic resin monomer as in Example 7 was poured into it and cured under the same conditions as in Example 7. After that, the master was peeled off.

This roll was mounted on an extrusion molding machine (SHT90-32DVG, manufactured by Hitachi Zosen Co., Ltd.), and 2.3 m
Die temperature is 250 ° C, roller temperature is 15
Polycarbonate (made by Teijin Chemicals Co., K-
1285) was extruded to a thickness of 1.2 mm.

When the extruded substrate was measured, the unevenness in thickness was 50 μm at the maximum, which was sufficiently small. The value of birefringence was 20 nm in a single pass, and the variation was small. (Nippon Electronic Optical Co., Ltd., birefringence measuring machine, λ = 830n
measured in m). The light transmittance was 89%, which was sufficiently transparent (U-3400, manufactured by Hitachi Ltd., measured at λ = 830 nm).
The amount of surface deflection was 20 μm in pp, which was sufficiently small (measured by a three-dimensional measuring machine manufactured by Carl Zeiss). The transfer rate of the preformat pattern formed on the long stamper was 97 to 98% in depth (measured by Taristep manufactured by Taylor Hobson). Transfer of line width and track pitch was 100-101%. (Measured with a surface profiler manufactured by Elionix).

This substrate was cut into 86 mmφ and an optical recording material represented by the following structural formula (I) was solvent coated.

[0078]

[Chemical 1]

86 mmφ of 0.3 mm thick polycarbonate (Panlite 251 manufactured by Teijin Kasei) is used as a protective substrate.
The cut pieces were used and bonded so as to have an air gap of 0.3 mm. After recording / playback,
Disc speed 1800rpm, writing frequency 3M
Hz, writing power 6 mW, reading power 0.5 m
At W, the C / N ratio was 50 dB. (Made by Nakamichi,
(Measured with OMS-1000II)

Example 9 An ultraviolet curable resin (INC 118, manufactured by Nippon Kayaku Co., Ltd.) was applied to the same polyester sheet as in Example 1 to a thickness of 10 μm, and the same nickel stamper as in Example 1 was used as a master plate for 5 KW. UV curing resin (manufactured by USHIO INC.) Was completely cured, and the same number of patterns as in Example 1 was transferred to produce a long stamper. The pattern transfer was 99% in depth, the line width and track pitch were 100%, and the pattern transfer rate was good. As in Example 1, no wrinkles on the surface of the base sheet due to the transfer of the pattern were observed.

It was fixed to the same chrome-plated iron roll having a diameter of 300 mmφ as in Example 1 by the same method as in Example 1. The maximum step difference at the joint was 10 μm. The maximum value (pp) of surface irregularities was 3 μm, and the surface accuracy was good as in Example 1.

This roll was attached to the same extruder as in Example 7, and the same resin as in Example 7 was extrusion molded under the same conditions. When measuring the extruded resin,
The maximum thickness unevenness was 50 μm, which was sufficiently small. The value of birefringence was 20 nm in a single pass, and the variation was small. The light transmittance was 89%, which was sufficiently transparent. The amount of surface deflection was 50 μm in pp, which was sufficiently small. The transfer rate of the preformat pattern formed on the long stamper was 97 to 98% or more in depth. Transfer of line width and track pitch was 100-101%.

This substrate was 86 mmφ in the same manner as in Example 7.
After cutting into optical discs to form an optical recording layer, a protective substrate was adhered to complete an optical disc. When recording / reproducing was performed, the disk rotation speed was 1800 rpm, the writing frequency was 3 MHz, the writing power was 6 mW, the reading power was 0.5 mW, and the C / N ratio was 53 dB.

Example 10 An ultraviolet ray curing resin (INC118, manufactured by Nippon Kayaku Co., Ltd.) was applied to an aluminum sheet having the same thickness and size as in Example 1 to a thickness of 10 μm to give a pitch of 12 μm and a width of 2.5 μm. 99 x 7 with a groove of 3000 Å deep card pattern
Using a 1 mm glass stamper (thickness: 2 mm) as a master, the UV curable resin was completely cured using a 5 KW UV lamp (manufactured by Ushio Inc.) to transfer the same number of patterns as in Example 1. Then, a long stamper was produced. The pattern transfer was 99% in depth, the line width and track pitch were 100%, and the pattern transfer rate was good. As in Example 1, no wrinkles on the surface of the base sheet due to the transfer of the pattern were observed.

It was fixed to the same chromium-plated iron roll having a diameter of 300 mmφ as in Example 1 by the same method as in Example 1. The maximum step difference at the joint was 10 μm. The maximum value (pp) of surface irregularities was 3 μm, and the surface accuracy was good as in Example 1. This roll was attached to the same extruder as in Example 7, and the same resin as in Example 7 was extrusion molded under the same conditions. When the resin extruded was measured, the unevenness in the thickness was 50 μm at the maximum, which was sufficiently small. The value of birefringence is 10 in a single pass.
There was no variation in nm. The light transmittance was 90%, which was sufficiently transparent. The amount of surface deflection was 20 μm in pp, which was sufficiently small. The transfer rate of the preformat pattern formed on the long stamper was 97 to 98% or more in depth. Transfer of line width and track pitch is 100 ~
It was 101%.

This substrate was coated with the same optical recording material as in Example 7 by a solvent, and then a 0.25 mm thick polycarbonate (Panlite 251 manufactured by Teijin Chemicals Ltd.) backing material was used as a hot melt adhesive (Hirodine, Evaflex). EXP8
0) was used for bonding. Then, an optical card was prepared by cutting into a card size of 86 × 54 mm.

When recording / reproducing under the following conditions, C
The / N ratio was 50 dB. Card feeding speed: recording 60 mm / sec, playback 400 mm
/ Sec Recording frequency: 7.65 kHz Laser power: Writing 3.5 mW, reading 0.2
mW, spot system 3 μm

Comparative Example 1 30 pieces (3 × 10) of the same nickel stamper as in Example 1 were attached to the same polyester sheet as in Example 1 using the same adhesive as in Example 1 in the same manner as in Example 1. A long stamper was produced. The long stamper was attached to the same roller as in Example 1 by the same method as in Example 1. The pattern transfer was 96% in depth, the line width and track pitch were 100%, and the pattern transfer rate was good.

In the same manner as in Example 1, the long stamper was attached in order from the outer peripheral direction of the roll from one end. The gap between the seams of the long stamper was 5 μm or less, which was sufficient accuracy. However, the maximum step difference at each end of each stamper or joint is 100-300 μm,
The gap had a length of about 300 to 500 μm.

Using this roller, a resin substrate is molded under the same conditions as in Example 7. The steps and gaps at the ends and joints of each of these stampers are transferred to the resin,
The amount of surface wobbling was too large to be suitable as a resin substrate. Further, since unevenness of the pressing force at the time of molding the resin is generated in the step and the gap, the birefringence of the resin substrate is caused in the embodiment 7.
The thickness was about 400 nm as measured by the same method as that of 1. In addition, the end of each stamper attached to the long stamper was peeled off during molding, and it became clear that resin molding by this method was inappropriate.

Comparative Example 2 Using the same nickel stamper as in Example 1 and the same adhesive as in Example 1, 30 pieces (3 × 10) were made in Example 1 by the same method.
I stuck it on the same roller. Similar to Comparative Example 1, the maximum step difference at each end and joint of each stamper is 100.
.About.300 .mu.m, and the gap has a length of about 300 to 500 .mu.m. When a resin substrate is molded under the same conditions as in Example 7 using this roller, steps and gaps at the ends and joints of each stamper are However, it was unsuitable as a resin substrate because the amount of surface runout was too large.

Further, since unevenness of the pressing force at the time of molding the resin is generated in the step and the gap portion, the birefringence of the resin substrate is about 400 nm as measured by the same method as in Example 7, which is unsuitable as a substrate. there were. As in Comparative Example 1, the end of each stamper attached to the roller was peeled off during molding, and it became clear that resin molding by this method was inappropriate.

[0093]

As described above, according to the present invention, since the stamper made of a resin material is fixed to the outer peripheral portion of the roller, the roller for manufacturing the optical recording medium substrate having good pattern accuracy and flatness is inexpensive. There is an effect that can be provided to.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a roller for producing a substrate for an optical recording medium produced by the method of the present invention.

FIG. 2 is a schematic cross-sectional view of a first method of manufacturing a resin stamper of the present invention.

FIG. 3 is a schematic sectional view of a second method for manufacturing a resin stamper of the present invention.

FIG. 4 is a schematic sectional view of a third method for manufacturing a resin stamper of the present invention.

FIG. 5 is a schematic sectional view of a fourth method for manufacturing a resin stamper of the present invention.

FIG. 6 is a schematic sectional view of a fifth method for manufacturing a resin stamper of the present invention.

FIG. 7 is a schematic view of a conventional method for manufacturing an optical recording medium substrate by extrusion molding.

FIG. 8 is a schematic view of a method for manufacturing a substrate for an optical recording medium by a conventional ultraviolet curing resin method.

FIG. 9 is a general cross-sectional view of a conventional optical recording medium.

[Explanation of symbols]

 1 Roller 2 Resin Stamper 3 Concavo-convex Pattern 4 Master 4a Flexible Master 5 Base Sheet 6, 6a, 6b, 6c, 6d Resin Liquid (Resin Layer) 7 Ultraviolet and Electron Beam Source 8 Pressurizing Type 9 Spacer 10 Backing Material 11 Substrate Resin 12 molding roller 13 pressure roller 14 T die 15 ruder 16 hopper 17 take-up roller 21 substrate resin sheet 22 unwinding roller 23 take-up roller 24 supply roller 25 pressure roller 26 molding resin coating device 31 transparent substrate 32 track groove 33 optical recording Medium 34 Spacer 35 Adhesive Layer 36 Protective Substrate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI technical display location // B29L 17:00 4F (72) Inventor Osamu Kaname 3-30-2 Shimomaruko, Ota-ku, Tokyo No. Canon Inc.

Claims (7)

[Claims] 1. A method for manufacturing an optical recording medium in which optical characteristics are changed by irradiating a light beam to record / reproduce information, and a transparent substrate with a preformat is continuously formed by molding using a roller-shaped mold. In the method for manufacturing a roller to be formed in step 1, a step of transferring one or a plurality of uneven patterns of a master having an uneven pattern corresponding to information to be recorded onto a resin sheet surface to form a resin stamper, A method for manufacturing a roller for manufacturing a substrate for an optical recording medium, comprising a step of fixing a stamper on a surface of a roll base material with an uneven pattern on the outside. 2. A roller for manufacturing a substrate for an optical recording medium having the resin stamper is provided with a resin liquid which is cured by radiation such as ultraviolet rays or electron beams on a master having an uneven pattern corresponding to information to be recorded. The step of applying, the step of heating and leveling the resin solution so that the thickness of the resin solution becomes uniform, if necessary, the base sheets made of resin are combined so that air bubbles do not enter the applied resin solution, In which the resin liquid is filled, the step of pressurizing the resin liquid so that the thickness of the resin liquid becomes uniform, and the resin liquid cured by irradiating the applied resin liquid with radiation such as ultraviolet rays or electron beams. To transfer the uneven pattern of the master to the resin liquid, the step of peeling the cured resin liquid from the master, and the step of fixing the resin liquid peeled from the master together with the base sheet to the roller. The method for producing a roller for producing a substrate for an optical recording medium according to claim 1, wherein 3. A roller for manufacturing a substrate for an optical recording medium having the resin stamper is a base sheet made of a thermoplastic resin or a thermosetting resin on a master having an uneven pattern corresponding to information to be recorded. , A step of transferring the uneven pattern of the master to the base sheet by heating and pressing while closely contacting the base sheet with the master, a step of peeling the base sheet from the master, a roller of the base sheet peeled from the master. The method for producing a roller for producing a substrate for an optical recording medium according to claim 1, further comprising a step of fixing the roller to the substrate. 4. A step of providing a resin layer having good moldability on the base sheet as needed, a step of bringing the base sheet provided with the molding resin layer into close contact with a master, and a step of bringing the base sheet into close contact with the master. The method comprises the steps of heating and pressing as it is to transfer the concavo-convex pattern of the master onto a base sheet, peeling the base sheet from the master, and fixing the base sheet peeled from the master to a roller. 4. The method for producing a roller for producing a substrate for an optical recording medium according to 3. 5. A roller for manufacturing a substrate for an optical recording medium having the resin stamper is cured by radiation such as ultraviolet rays or electron beams on a master having an uneven pattern corresponding to information to be recorded, and heat. A step of applying a resin liquid having moldability to form a layer of the resin liquid, a step of heating and leveling the resin liquid layer so that the thickness of the resin liquid layer becomes uniform if necessary, and bubbles are formed in the applied resin liquid layer. Do not enter
A step of combining base sheets made of resin, a step of pressurizing the resin liquid layer so that the thickness of the resin liquid layer becomes uniform as necessary, a master sheet by heating and pressing the base sheet coated with the resin liquid while closely contacting the master sheet. Of transferring the uneven pattern of the master to the resin liquid layer on the base sheet, and irradiating the resin liquid layer of the base sheet with radiation such as ultraviolet rays or electron beams to cure and transferring the uneven pattern of the master to the resin liquid. 2. The optical recording according to claim 1, further comprising a step of peeling the resin liquid layer on the cured base sheet from a master, and a step of fixing the resin liquid layer on the base sheet peeled from the master to a roller. A method for manufacturing a roller for manufacturing a medium substrate. 6. The roller for manufacturing a substrate for an optical recording medium having the resin stamper reacts with heat, pressure, etc. on a master having an uneven pattern corresponding to information to be recorded, and is polymerized and cured. A step of applying a resin liquid, a step of forming a gap of a certain size so as to prevent bubbles from entering the applied resin liquid, aligning backing materials, and filling a resin liquid between them; A step of curing the resin liquid by heating or / and pressurizing so that the thickness of the liquid becomes uniform to transfer the uneven pattern of the master to the resin liquid, a step of peeling the cured resin liquid from the master, The method for manufacturing a roller for manufacturing a substrate for an optical recording medium according to claim 1, further comprising a step of fixing the peeled resin liquid together with the base sheet to the roller. 7. A roller for manufacturing a substrate for an optical recording medium, which has the resin stamper, is provided on a flexible master disk and / or roller on which an uneven pattern corresponding to information to be recorded is formed. A step of applying a resin liquid having a curability by radiation, heating, or pressurization, a step of leveling the resin liquid so that the thickness of the resin liquid becomes uniform if necessary, and preventing bubbles from entering the applied resin liquid. , A step of filling the resin between the flexible master and the roller together, a step of pressurizing the resin liquid so that the thickness of the resin liquid becomes uniform if necessary, and a roller close contact with the master filled with the resin liquid And transfer the uneven pattern of the master to the base sheet, and cure by applying radiation such as ultraviolet rays or electron beams, heat, or pressure to the resin liquid filled between the master and the roller. Then, the step of transferring the uneven pattern of the master to the resin liquid and fixing the resin liquid on the roller surface,
The method for manufacturing a roller for manufacturing a substrate for an optical recording medium according to claim 1, further comprising a step of peeling the master disk from the cured resin liquid.