JP3072794B2 - Forming roll for substrate sheet for optical recording medium, apparatus for manufacturing substrate sheet for optical recording medium, method for manufacturing substrate sheet for optical recording medium, substrate sheet for optical recording medium manufactured thereby, and method for manufacturing optical recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording information by changing optical characteristics such as reflectivity by light such as a laser beam.
Molding roll, molding apparatus, molding method, and optical recording medium substrate sheet produced by them for continuously producing substrates for high-density information recording media such as optical discs and optical cards for reproduction, and the molding The present invention relates to an optical recording medium manufactured by using the method.

[0002]

2. Description of the Related Art Conventionally, an optical recording medium is formed by providing a recording layer on a substrate transparent to light for recording / reproducing information, for example, a semiconductor laser or the like, and laminating a protective layer thereon. On the surface of the optical recording medium substrate, fine preformats such as grooves for tracking and address information pits are usually engraved on the order of microns or submicrons. Conventionally, as a method of forming these preformats, for example, an injection molding method and a compression molding method are known. However, it has been difficult for these methods to satisfy mass productivity and cost.

[0003] As a method for satisfying these requirements, the present applicant has disclosed in European Patent Application Publication No. 369780 and European Patent Application No.
No. 69781, a method for producing a substrate sheet for an optical recording medium in which a resin sheet is molded by melting and extruding a resin, and the molded resin sheet is sandwiched between a molding roll and a roll arranged opposite thereto to transfer a preformat. Is disclosed.

According to these methods, even when a resin such as polycarbonate, which easily causes birefringence, is used, it is excellent in transferability of a preformat and has a small birefringence which causes deterioration of C / N value. Substrate sheets can be manufactured continuously.

However, the above-mentioned manufacturing methods were examined in various ways. As a result, slight changes in the molding conditions such as the extruder heating temperature, the molding roll and mirror surface roll heating temperatures, and the room temperature during the molding caused slight changes in the birefringence value of the substrate sheet. We have found a problem that the transfer accuracy changes. Such fluctuations in birefringence and transfer accuracy are undesirable in stabilizing the performance of the optical recording medium even if the fluctuations are within the allowable range.

As a result of a detailed study of the problem by the present inventors, for example, a substrate sheet for an optical recording medium using three rolls as shown in FIG. In the case of molding, in order to obtain a high-quality substrate sheet, the molded resin sheet 82 extruded from the T-die 81 is formed so that birefringence does not occur at the time of being pressed between the first roll 83 and the molding roll 84. (To prevent the stress applied to the resin from being fixed) and to maintain the state close to the molten state in order to improve the transferability. Also, when the molded resin sheet is smoothly transferred from the molding roll 84 to the third roll 85, the molding is performed. It is necessary that the resin sheet is cooled so as not to adhere to the molding roll. However, conventionally, this was achieved by adjusting the molding conditions, so that a high-quality optical recording medium substrate sheet was formed. Temperature particular resin temperature and forming rolls margin conditions when it was found that was small margin when shifted to the low temperature side.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a high-precision transfer precision and low birefringence of a substrate sheet for an optical recording medium at a high level even when molding conditions vary. It is an object of the present invention to provide a forming roll that can be maintained.

Further, the present invention provides an optical recording medium substrate manufacturing apparatus capable of stably manufacturing an optical recording medium substrate sheet without changing the preformat transfer accuracy and birefringence even when molding conditions vary. To provide for other purposes.

Further, the present invention provides an optical recording medium substrate having excellent preformat transfer accuracy and having a margin in molding conditions for stable production of a low birefringence optical recording medium substrate. It is still another object of the present invention to provide a method for producing the same.

[0010]

That is, a forming roll according to an embodiment of the present invention is used to transfer a preformat pattern to a resin sheet formed by melting and extruding a resin to form a substrate sheet for an optical recording medium. In the forming roll, the forming roll comprises a roll base and a stamper detachably fixed to the peripheral surface of the roll base, and a heat insulating layer between the roll base and the stamper It is characterized by having a resin layer.

A molding roll according to one embodiment of the present invention is a molding roll for transferring a preformat pattern to a resin sheet formed by melting and extruding a resin to form a substrate sheet for an optical recording medium. The forming roll comprises a roll base and a plurality of stampers removably fixed to the peripheral surface of the roll base in the circumferential direction of the roll base, and the roll base and each stamper A resin layer as a heat insulating layer is provided therebetween, and the resin layer has a specific thickness corresponding to the thickness of each stamper.

An apparatus for manufacturing a substrate sheet for an optical recording medium according to one embodiment of the present invention is a means for molding a resin sheet by melting and extruding a resin, and transferring the preformat to the surface of the resin sheet by pressing the resin sheet. In a manufacturing apparatus of an optical recording medium substrate sheet having a molding roll for performing and a mirror-finished roll disposed opposite to the molding roll, the molding roll is detachably attached to a roll base material and a peripheral surface of the roll base material. It is a forming roll comprising a fixed stamper and a resin layer as a heat insulating layer between the roll base material and the stamper. Further, an apparatus for manufacturing a substrate sheet for an optical recording medium according to another embodiment of the present invention is a means for molding a resin sheet by melting and extruding a resin, and pressing the resin sheet to transfer a preformat to the surface of the resin sheet. In a manufacturing apparatus for an optical recording medium substrate sheet having a molding roll for use and a mirror-finished roll disposed opposite to the molding roll, the molding roll can be detachably attached to a roll substrate and a peripheral surface of the roll substrate. A plurality of fixed stampers are provided in the circumferential direction of the roll base material, and a resin layer as a heat insulating layer is provided between the roll base material and each stamper, and the resin layer is formed of each stamper. It is a forming roll having a unique thickness corresponding to the thickness.

According to one embodiment of the present invention, there is provided a method of manufacturing a substrate sheet for an optical recording medium, comprising the steps of: extruding a molten resin to form a resin sheet;
In a method for manufacturing a substrate sheet for an optical recording medium, the method includes a step of transferring a preformat onto a surface of a resin sheet by pressing a mirror surface roll opposed to the molding roll to form a preform. And comprising a stamper detachably fixed to the roll substrate peripheral surface,
Further, a molding roll provided with a resin layer as a heat insulating layer between the roll base material and the stamper is used. A method of manufacturing a substrate sheet for an optical recording medium according to another embodiment of the present invention includes a step of extruding a molten resin to form a resin sheet, and the resin sheet being disposed to face a molding roll and the molding roll. In a method of manufacturing a substrate sheet for an optical recording medium having a step of transferring a preformat onto a surface of a resin sheet by pressing with a mirror-finished roll, attaching and detaching the molding roll to a roll substrate and a peripheral surface of the roll substrate A resin layer as a heat insulating layer is provided between the roll base material and each of the stampers, and a plurality of stampers that are fixed as possible are provided in the circumferential direction of the roll base material,
The resin layer is characterized by using a forming roll having a unique thickness corresponding to the thickness of each stamper. In a method for manufacturing a substrate sheet for an optical recording medium according to still another embodiment of the present invention, a preformat pattern is formed on a peripheral surface of a resin sheet extruded from a die when the resin sheet is substantially in a molten state. A pre-format pattern having a predetermined range of birefringence by being squeezed between a forming roll having a predetermined surface temperature and a roll disposed opposite to the forming roll, and having a predetermined range of transfer accuracy. In a method for producing a substrate sheet for an optical recording medium having a surface transferred thereon, the forming roll has a roll base material and a stamper having the preformat pattern on the surface, and between the stamper and the roll base material. A resin layer is arranged,
The resin layer is made of a resin having a lower thermal conductivity than that of the roll substrate and the stamper, and the resin layer is an effective material that inhibits heat conduction from the substrate sheet to the roll substrate. An optical recording medium substrate sheet that functions as a heat insulating layer, thereby having a birefringence amount within the predetermined range, and onto which a preformat pattern has been transferred with the transfer accuracy within the predetermined range, is provided. When the stamper has a configuration in which the stamper is directly fixed to the peripheral surface of the roll substrate without interposing the resin layer and has the same surface temperature as the predetermined surface temperature, the amount of birefringence exceeding the predetermined amount of birefringence And an optical recording medium substrate sheet having at least one of transfer accuracy lower than the transfer accuracy in the predetermined range.

A substrate sheet for an optical recording medium according to an embodiment of the present invention is a means for molding a resin sheet by melting and extruding a resin, and for pressing a resin sheet to transfer a preformat to the surface of the resin sheet. A forming roll comprising a roll base material and a stamper detachably fixed to a peripheral surface of the roll base material, and a resin layer as a heat insulating layer between the roll base material and the stamper; An optical recording medium substrate sheet manufactured by an apparatus for manufacturing an optical recording medium substrate sheet having a mirror roll arranged opposite to the roll is characterized.

A substrate sheet for an optical recording medium according to an embodiment of the present invention is formed by extruding a molten resin to form a resin sheet, and is detachably fixed to a roll base material and a peripheral surface of the roll base material. The resin sheet is pressed by a forming roll having a stamper and having a resin layer as a heat insulating layer between the roll base material and the stamper, and a mirror-finished roll disposed opposite to the forming roll. And a step of transferring a preformat onto the surface of the sheet.

A method for manufacturing an optical recording medium according to one embodiment of the present invention comprises a step of extruding a molten resin to form a resin sheet, and a detachably fixed roll base and a peripheral surface of the roll base. The resin sheet is pressed by a forming roll having a stamper and having a resin layer as a heat insulating layer between the roll base material and the stamper, and a mirror-finished roll disposed opposite to the forming roll. A step of preparing an optical recording medium substrate sheet manufactured by the method of manufacturing an optical recording medium substrate sheet having a step of transferring a preformat onto the surface of the sheet, and a step of cutting the optical recording medium substrate sheet into single sheets Forming an optical recording layer and a protective layer on the optical recording medium substrate sheet.

That is, according to the present invention, the resin layer between the stamper and the roll base material functions as a heat insulating layer, so that the first roll and the forming roll can be sandwiched even when the temperature conditions during the molding are changed, especially to the low temperature side. The transfer of heat from the molded resin sheet to the molding roll during pressurization is hindered, and the high temperature state of the molded resin sheet can be maintained at the pinching point, so that the melt viscosity sharply decreases and the molded resin sheet follows the stamper. This makes it possible to obtain a high-quality substrate sheet without fixing properties and internal strain.

Heretofore, there has been a conventional method in which bonding is performed simply for the purpose of fixing a stamper to a roll base material, and as a result, a resin layer is formed. However, this adhesive layer is extremely thin, and it is difficult to set the thickness of the adhesive layer to an arbitrary thickness, and it is also difficult to keep the thickness uniform. Further, the stamper and the roll base material are not detachable, and there is a disadvantage that it is difficult to replace only the stamper. Such a forming roll does not disclose the object, configuration and effect of the present invention at all.

Next, the present invention will be described in detail with reference to FIGS. 1, 2 and 3. FIG.

FIGS. 1 and 2 are a schematic sectional view and a perspective view, respectively, showing one embodiment of a molding roll for molding a resin substrate of an optical recording medium according to the present invention.

1 and 2, a molding roll 3 according to the present invention comprises a fixing member 14 having a stamper 13 having a preformat pattern 15 on the surface of a roll base 11 having a mirror-finished surface fixed to the back surface of the stamper. It is detachably fixed by a groove that engages with a fixture formed on the roll base material, and a resin layer 1 is provided between the stamper 13 and the roll base material 11.
2 is provided.

FIG. 3 shows one embodiment of an apparatus for forming a substrate sheet for an optical recording medium using the forming roll 3 of the present invention, wherein 31 is an extruder, 32 is a T die, and 33 is a T die. Molded resin sheets 34 and 35 which are melt-extruded from a die are first and second mirror rolls. The molded resin sheet 33 is pressed between the roll 34 and the molding roll 3 in a molten state, and the preformat is transferred to form the optical recording medium substrate sheet.

For example, when polycarbonate is used as the substrate material for the resin layer 12 in the molding roll 3 of the present invention, the molding roll 3 and the mirror roll 34,
The temperature of 35 must be between 90 ° C and 150 ° C, and the temperature of the polycarbonate extruded from the extruder is
Since the temperature is about 300 ° C., it is desirable to have heat resistance of at least 200 ° C. or more. The heat resistance here means
Between the roll base material and the stamper, the resin layer at the time of molding the substrate sheet does not undergo melting deformation, decomposition, and other changes in mechanical properties at 200 ° C. for at least 2 hours, preferably 50 hours.

If a gap is formed between the resin layer 12 and the roll base material 11 and between the resin layer 12 and the stamper 13, the heat distribution on the surface of the forming roll becomes nonuniform and causes molding failure of the substrate sheet. 12 roll substrate 11 and / or
Alternatively, the surface roughness of the surface in contact with the stamper 12 is as small as possible, specifically, 1 μm or less, preferably 0.5 μm or less, and more preferably 0.2 μm or less. The tensile elongation of the resin layer is 200% or less, preferably 180% or less, and more preferably 150% or less, so that no deviation occurs on the roll base material. The tensile modulus is 2
It is preferable to set it to 00 to 1000 kg / mm ² (the test method conforms to ASTM D-882).

As the material used for such a resin layer 12, various resins can be used as long as the above conditions are satisfied. Polyimide, fluororesin, polyether ether ketone (PEEK), polyether When ether sulfone (PES), polyparabanic acid resin, polyphenylene oxide, polyarylate resin, and epoxy resin are used, the preformat pattern can be transferred to the resin layer with extremely high accuracy and the birefringence of the substrate sheet can be reduced. It is possible to reduce the influence on the substrate sheet due to the variation in molding conditions. Among them, polyimide has a large effect and can be particularly preferably used in the present invention.

Although the reason why these resins are preferably used in the present invention is not clear, it is assumed that various properties such as thermal conductivity and elasticity elongation act comprehensively to provide excellent effects. Conceivable.

More specifically, the above-mentioned resins include, as the polyimide resin, an aromatic dicarboxylic anhydride represented by, for example, pyromellitic anhydride and an aromatic diamine represented by diaminodiphenyl ether as raw materials. A resin represented by the formula is exemplified.

[0028]

[Outside 1]

Examples of the fluororesin include homopolymers such as polytetrafluoroethylene (PTFE), polymonochlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF) and polyvinyl fluoride (PVF), and tetrafluoroethylene Copolymers such as fluoroalkyl vinyl ether copolymer (PFA) and fluorinated ethylene propylene copolymer (FEP) are exemplified.

PEEK is a polymer represented by the following general formula.

[0031]

[Outside 2]

PES is a polymer represented by the following general formula.

[0033]

[Outside 3]

Further, examples of the epoxy resin include those using bisphenol A and epichlorohydrin as raw materials, those using cycloaliphatic raw materials, and those derived from polybutadiene having a molecular weight of 5,000 or more, preferably about 8,000 or more.

Next, polyparabanic acid resin (PPA) is a polymer represented by the following general formula.

[0036]

[Outside 4]

In addition, polyphenylene sulfide (PP
S) is a polymer represented by the following general formula.

[0038]

[Outside 5]

Further, polyarylate (PA) is an aromatic polyester resin produced by a polycondensation reaction between an aromatic dicarboxylic acid and bisphenol, and has a structure represented by the following general formula when bisphenol A is used as bisphenol, for example.

[0040]

[Outside 6]

The resin sheet used or the formed coating film may contain a third component such as a plasticizer, but the content is preferably 5% or less, particularly preferably 3% or less.

Such a material may be appropriately selected from commercially available materials and may be used depending on the method of manufacturing a forming roll of the present invention described later. However, when a polyimide sheet is used as a resin layer, for example, a trade name: Kapton (manufactured by Du Pont), trade names: Upilex-S and -R (manufactured by Ube Industries, Ltd.) and the like.

In the case of a fluororesin sheet, PTFE is a trade name: Nitoflon (manufactured by Nitto Denko Corporation), PCTF
E: trade name: NEOFLON CTFE (manufactured by Daikin Industries, Ltd.); PVdF: trade name: KF film (manufactured by Kureha Chemical Co., Ltd.) or trade name: KYNAR (Mitsubishi Yuka Corporation, Nippon Penn-Walt) Teflar (manufactured by Du Pont) as PVF, and Neoflon PFA (Daikin Industries, Ltd.) as PFA
Trade name: Teflon PFA (manufactured by Mitsui Fluorochemicals Co., Ltd.), and as FEP, trade name: NEOFLON FEP
(Manufactured by Daikin Industries, Ltd.), trade name: Teflon FEP
(Made by Du Pont) and the like.

As the PEEK sheet, a trade name: T
ALPA-2000 (manufactured by Mitsui Toatsu Chemicals), trade name: Espex (manufactured by Sumitomo Chemical Co., Ltd.), and PE
As the sheet for S, trade name: TALPA-1000 (manufactured by Mitsui Toatsu Chemicals, Inc.), trade name: Sumilite FS-53
00 (manufactured by Sumitomo Bakelite Co., Ltd.); polyparabanic acid resin sheet: trade name: Soldax (manufactured by Tonen Petrochemical Co., Ltd.); polyphenylene sulfide sheet: trade name: torelina (manufactured by Toray Industries, Inc.) Polyarylate sheet: trade name: Embrate (manufactured by Unitika), trade name: Elmec (manufactured by Kanebuchi Chemical Co., Ltd.)
Etc. can be used.

Further, when the resin layer 12 is formed as a coating film on the back surface of the stamper 12 and / or the peripheral surface of the roll substrate 11, for example, in the case of polyimide, the trade name is LARC.
-TP1 (manufactured by Mitsui Toatsu Chemicals, Inc.) can be used.

Next, the thickness of the resin layer 12 is 10 to 5
00 μm is suitable, especially 20 to 220 μm, and more preferably 5 μm.
0 to 200 μm is preferred. In other words, this allows the resin layer to function as a heat insulating layer for the molded resin sheet, but does not impede the supply of heat from the roll base material 11 to the stamper 12 for keeping the stamper at a constant temperature, and the stamper on the roll base material Deviation can also be prevented.

Furthermore, since the heat insulating effect of the forming roll of the present invention also varies depending on the thickness of the stamper 13, when a metal stamper is used, the thickness of the resin layer 12 should be within the above range. 0.1 to 2 times as standard,
It is particularly preferable to set the value to 0.2 to 1 times.

Next, a method of manufacturing the forming roll 3 of the present invention will be described with reference to FIGS. FIG. 4 shows a first representative embodiment of the present invention, in which a roll 11 and a stamper 1 are provided.
3, a resin sheet 41 is interposed therebetween. The resin sheet is sandwiched between a stamper 12 and a roll base material 11 and held by a molding roll to form a resin layer 12. According to this configuration, the heat insulation effect can be exerted by the resin sheet, and when the resin layer 12 that is relatively thick (for example, 75 to 200 μm) in terms of the sheet is provided,
The handling is simple and the thickness of the resin layer can be controlled by the thickness of the sheet, and the heat insulation effect of the forming roll can be easily adjusted only by changing the thickness of the resin sheet. In the case where the stamper is changed or replaced with a stamper having a different thickness, there is an advantage that the heat insulating effect according to the resin material or the stamper can be optimized by selecting the thickness of the resin sheet.

FIGS. 5 and 6 show the second embodiment of the molding roll of the present invention.
FIG. 5 shows a stamper 13 and a third representative embodiment.
In this embodiment, a resin layer 12 is formed as a coating film 51 on the surface (rear surface) opposite to the surface on which the preformat pattern is formed, and FIG. In this embodiment, the resin layers 12 are formed by forming the coating films 61 and 62 and bringing them into close contact with each other. In these configurations, since the resin layer is formed in advance on the peripheral surface of the stamper or the roll base material, it is possible to reduce the contamination of dust and the like when mounting the stamper on the roll base material,
Defects in the molded sheet are reduced and the quality yield can be improved, and there is no need to consider the surface roughness of both surfaces as in the case of a sheet. 4 to 6 are also very effective when a plurality of stampers are mounted on the peripheral surface of the roll base material 11 in the circumferential direction as shown in FIG. That is, the stamper 13 is manufactured to have a thickness of, for example, 200 μm, but an error of ± 25 μm easily occurs in the manufacturing process.

When a plurality of stampers having different thicknesses are arranged in the circumferential direction of the roll base material, the heat capacity with respect to the molding resin sheet changes at each of the stamper arrangement sites, and the gap between the molding roll and the first roll is increased. Since the pressure applied to the resin sheet changes due to the change for each stamper, which causes the transfer accuracy and the birefringence of the substrate sheet to be unstable, the forming roll of the embodiment shown in FIGS. In this case, since the thickness of the resin layer 12 can be uniquely set according to the thickness of the stamper 13, the heat capacity can be made uniform, the roundness of the molding roll 3 can be adjusted, and a high-quality optical recording medium substrate sheet can be stably mass-produced. Especially preferred above.

FIG. 7 shows an embodiment in which a resin layer is formed as a coating film on the surface of the roll substrate 11. In the embodiment of FIG. 7, since the resin layer 71 is formed on the roll surface, it is advantageous when the stamper needs to be replaced.

In the embodiments shown in FIGS. 5, 6, and 7, the resin layer is in close contact with the stamper or the roll surface.
The resin layer is less likely to be displaced and the uniformity of the molded sheet is not impaired. Further, as a method of forming the forming roll by fixing the stamper 13 to the peripheral surface of the mirror roll 11, for example, as shown in FIG. There is a method in which a groove engageable with a fixture is formed, and the fixture is fitted and fixed in this groove. In addition to this, as shown in FIG.
As long as the resin layer 12 and the roll substrate 11 can be fixed to each other with good adhesion, any means can be used.

The roll base material 11 in the present invention is preferably one having high hardness, good thermal conductivity and easy mirror finishing of the peripheral surface, such as steel, chromium steel, aluminum, mold steel (maraging steel) and the like. Can be used. And the processing accuracy of the peripheral surface of the roll base material is approximately the same as or better than the surface accuracy of the optical recording medium substrate to be molded,
For example, it is preferably processed to 1 μm or less, preferably 0.5 μm or less, more preferably 0.2 μm or less. If necessary, the surface may be plated with a hardened film such as titanium nitride or plated with chromium. And the diameter of the roll substrate 11 is 100 to 500 mm, especially 2
It is set to about 00 to 400 mm.

The stamper 13 can be manufactured by a manufacturing method generally used for a CD (compact disk) or the like. Specifically, for example, a resist is applied to a glass master, and a pattern is exposed and developed. A stamper can be obtained by depositing nickel by sputtering, electroforming to deposit nickel to a predetermined thickness, and then peeling off the master. The stamper obtained in this manner may be used as a second master, and a grandchild stamper may be further manufactured.

The thickness of the stamper is as follows.
As indicated by 1, the thickness is preferably thinner than that generally used for injection, and the range is 1 to 2.
About 0 to 300 μm, more preferably 30 to 200 μm
It is.

The preformat pattern formed on the stamper 13 is specifically, for example, 1 μm-wide.
4 μm, pitch 1 μm-20 μm, depth 200 ang
A spiral, concentric or striped optical disk having a thickness of about 5000 angs or a pattern corresponding to a tracking groove for an optical card, an address having a width of 0.6 μm to 10 μm, a length of 0.6 to 20 μm and a depth of about 200 to 5000 angstroms. Patterns corresponding to pits and the like are given.

Next, a method for producing a substrate sheet for an optical recording medium using the molding roll of the present invention will be described in detail.

That is, in FIG. 3 described above, first, the resin pellets put into the extruder 31 are heated and melted in a barrel of the extruder 31, pressurized by a screw in the extruder, and sheet-formed by a T-die 32. It is shaped into a shape. It is preferable that the T-die is arranged so that the resin sheet is extruded between the molding roll 3 and the mirror roll 34 because the preformat can be accurately transferred.

Next, the molded resin sheet extruded from the T-die is pressed between the molding roll 3 and the mirror roll 4 to transfer the preformat. At this time, it is preferable that the molded resin sheet 2 is extremely close to a molten state. That is, because the resin is sufficiently pressed into the irregularities of the stamper, a fine pattern is accurately transferred. Therefore, it is preferable to heat the T-die to a temperature as high as possible within a range where the resin does not decompose.
g) + 110 ° C to Tg + 200 ° C, especially Tg + 130
C. to Tg + 190 C. are preferred. For example, in the case of a polycarbonate resin, 260 ° C to 340 ° C, particularly 280 ° C to 330 ° C.
C. It is preferable to further heat to 290 ° C. to 320 ° C. Further, when the resin sheet is cooled between the T-die 32 and the molding roll, the preformat is not sufficiently transferred and birefringence is likely to occur. The distance between the pressing point of the molding roll 3 and the first mirror surface roller 34 is 20 cm or less,
In particular, it is preferably 15 cm or less, more preferably 10 cm or less, and the temperature of the surrounding atmosphere between them is desirably 60 ° C. or more.

It is preferable to adopt a vertical extrusion structure as shown in FIG. 3 in which the pressure point is located vertically below the T-die so that the resin sheet can be accurately extruded to the pressure point. This is because the resin is close to the molten state, so that vertical extrusion can extrude more accurately to the clamping point than horizontal extrusion.

The forming roll 3 and the mirror rolls 34, 3
Although the surface temperature of 5 differs depending on the resin used, for example, when polycarbonate is used, the temperature of the molding roll 3 is usually 110 in consideration of the heat deformation temperature of polycarbonate.
C to 145 C, the first mirror roll is 90 C to 135 C,
The third mirror surface roll is set at 120 ° C. to 150 ° C., and when an amorphous polyolefin is used, the temperature of the forming roll 3 is 120 ° C. to 145 ° C., and the first mirror surface roll is 10 ° C.
0 ° C to 135 ° C, or the third mirror roll is 120 ° C to 1 ° C.
The temperature is set to 50 ° C., and according to the present invention, even if the set temperature fluctuates within this range, the transfer accuracy and birefringence of the preformat do not fluctuate greatly, and a uniform and excellent substrate sheet for optical recording medium can be manufactured. The temperature of these rolls is controlled, for example, by heating with a heater cast into the rolls or by circulating a heating medium in the center.

In the present invention, when molding is performed using three rolls as shown in FIG. 3, the rotational speed (peripheral speed) of the molding roll 3 and the rotational speed (peripheral speed) of the third mirror surface roll 35 are set. Is effective to reduce the birefringence of the substrate sheet, improve the transferability of the preformat pattern, and further improve the planarity of the substrate sheet. The rotational speed of the forming roll 3 and the mirror roll 35 is effective. Ω ₃ and ω ₃₅ respectively, the speed ratio ω ₃ / ω ₃₅ is 1.0 <ω ₃ / ω
₃₅ ≦ 1.004, especially 1.001 ≦ ω ₃ / ω ₃₅ ≦ 1.0
03 and more preferably 1.001 ≦ ω ₃ / ω ₃₅ ≦ 1.025.

The optical recording medium substrate sheet having the preformat pattern transferred to the front surface and the mirror surface transferred to the back surface is cut into single sheets, and then an optical recording layer, a protective layer, and the like are sequentially formed to form an optical recording medium. Can be obtained. Alternatively, an optical recording medium is obtained by continuously forming an optical recording layer and a protective layer in the form of a sheet, and further forming a hard coat layer continuously on the mirror-transfer surface of the substrate sheet for an optical recording medium, and then cutting the optical recording medium. It is.

The resin used as the substrate material is preferably a thermoplastic resin having high transmittance to light for recording / reproducing. For example, acrylic resin, polyester resin, polycarbonate resin, vinyl resin , Polysulfone resins, polyolefin resins, cellulose derivatives and the like.

In the present invention, the term "removable" means that no substantial separating force is required at the interface between the two when detaching.

[0066]

Next, the present invention will be described in more detail with reference to examples.

Example 1 A 0.3 mm-thick Cr plating was applied to the peripheral surface of an iron roll having a diameter of 300 mm and a width of 400 mm, and the surface thereof was mirror-finished to a surface roughness of 0.1 μm to obtain a roll base material 11. Then, the fixture 14 engages with the roll base material as shown in FIG. Four trapezoidal grooves 101 having an upper bottom of 10.05 mm, a lower bottom of 15.05 mm, and a height of 5 mm were formed.

On the other hand, the stamper was manufactured as follows. First, a photoresist (trade name: AZ-1300; a glass master having a side length of 300 mm and a thickness of 10 mm) is provided.
Hoechst Japan Co.) was applied to a thickness of 300 nm. Next, groove width 3 μm, pitch 12 μm, depth 25
A preformat pattern corresponding to 2584 optical card track grooves having a trapezoidal cross section at a 00 ° angle (x) of 60 ° is formed by four 80 mm ×
Draw with a laser cutting machine in a 30 mm area,
After the development processing, Ni was formed to a thickness of 100 nm on the resist layer by sputtering. After that, Ni is further adhered to a thickness of 200 μm by electroforming, the Ni film is peeled off from the resist layer, and the back surface on which the preformat pattern has not been transferred is mirror-polished to a thickness of 150 μm. The stamper 13 was formed by finishing the surface roughness to 0.1 μm.

Next, on the back surface of both ends of the stamper 13, the upper side is 10 mm, the lower side is 15 mm, the height is 5 mm and the length is 300 m
The two stainless steel fixtures 14 were laser-welded to be integrated with the stamper 13.

The back surface of the stamper 13 has a thickness of 100 μm.
m sheet of tetrafluoroethylene polymer (trade name: Nitoflon; manufactured by Nitto Denko Corporation, heat-resistant temperature 260)
° C) and the groove 101 of the roll base material 11 prepared earlier.
Then, the fixture 14 was inserted, and the stamper was fixed to a mirror roll to form a forming roll. In exactly the same way, another stamper was fixed to the roll base material 11 to produce a forming roll shown in FIG.

The extruder 31 (trade name: SHT90; attached to the molding device shown in FIG. 3)
Extruded polycarbonate (Panlite L-1225; Teijin Chemicals) from Hitachi Zosen Corporation and 0.4 m thick
An optical card substrate sheet having a width of 30 cm was molded.

The molding conditions were as follows.
The surface temperature of the molding roll was 140 ° C., the conveying speed of the molding resin sheet was 3 m / min, and the ratio between the peripheral speed of the molding roll 3 and the peripheral speed of the mirror roll 35 was set to 1.001, and molding was performed for 5 hours. When the birefringence index of each of the nine preformat transfer portions of the substrate sheet thus obtained was measured, the average value was 10 nm. Regarding the transfer accuracy, the cross-sectional shape in the direction perpendicular to the track groove direction at nine locations of the preformat pattern transfer portion was observed with an electron beam surface morphology analyzer (product name: ESA-3000; manufactured by Elionix Inc.). As shown in FIG. 11, the width of the land portion of the groove transfer portion of the substrate sheet is a, and the width of the lower bottom of the groove for forming the groove of the stamper is A, as shown in FIG. The average value was evaluated. As a result, a / A at each measurement site
Was 0.97, and a substrate sheet for an optical recording medium having extremely excellent transfer accuracy was obtained.

Further, the thickness unevenness of the substrate sheet was 10 μm or less, which was within the standard of an optical card substrate. The birefringence was measured using a polarimeter (SP-224; manufactured by Shinko Seiki Co., Ltd.) at a wavelength of 830 nm and a spot diameter of 1 μm.
And evaluated with a single pass value.

Next, the surface temperature of the forming roll is set to 130 ° C. to 1
The optical card substrate sheet was molded under the above conditions except that the temperature was changed between 50 ° C. at 5 ° C. intervals. The transfer accuracy and the birefringence of the preformat pattern of the substrate sheet at this time (except when the forming roll temperature was set to 140 ° C.) were measured and evaluated by the methods described above. As a result, Table 1 shows the average value of the transfer accuracy (a / A) and the average value of the birefringence.

The plots are shown in FIGS.

[0076]

[Table 1]

Comparative Example 1 In Example 1, a molding roll was prepared without a resin layer between the stamper and the roll base material. Then, a substrate sheet was molded in the same manner as in Example 1 except that the surface temperature of the molding roll was set to 150 ° C. As a result of evaluating the obtained substrate sheet in the same manner as in Example 1, the birefringence was 8 nm on average. A / A is 0.9 on average as transfer accuracy.
It was 0. Next, Table 2 shows the values of the transfer accuracy and the birefringence when the temperature of the forming roll was changed at an interval of 5 ° C. from 130 ° C. to 150 ° C. in the same manner as in Example 1.

The average values are shown in FIGS.

[0079]

[Table 2]

As can be seen from the results of Example 1 and Comparative Example 1, the temperature of the forming roll of the present invention was 130 ° C. to 150 ° C.
Even when the temperature fluctuated between ° C., a high-quality substrate sheet for an optical recording medium was always molded, and the margin of molding conditions could be expanded.

Example 2 A stamper and a roll base material were prepared in the same manner as in Example 1,
A 75 μm thick polyimide sheet (trade name: Upilex R, manufactured by Ube Industries, Ltd., heat-resistant temperature 4)
00 ° C elongation 130%, tensile elasticity 380kg / m
m ² (25 ° C.)) and attached to a mirror-finished roll substrate as in Example 1 to form a forming roll. Using this forming roll, a substrate sheet for an optical card was formed in the same manner as in Example 1. However, three types of substrate sheets were formed by changing the conveying speed of the resin sheet to 4 m / min and changing the temperature of the forming roll to 130 ° C., 140 ° C. and 150 ° C. Table 3 shows the results of evaluation of the obtained substrate sheet in the same manner as in Example 1.

The thickness unevenness of the substrate sheet was 10 μm at the maximum.

The evaluation of the birefringence and transfer accuracy of the substrate sheet after Example 2 was performed according to the following criteria.

[0084]

[Table 3]

Example 3 A 0.1 mm-thick Cr plating was applied to the periphery of an iron roll having a diameter of 300 mm and a width of 400 mm, and the surface thereof was mirror-finished to a surface roughness of 0.1 μm to obtain a roll base material 11. Then, as shown in FIG. 10, four rectangular grooves 101 each having a side of 15 mm and a height of 5 mm were formed on the roll base material as shown in FIG.

On the other hand, the stamper was manufactured as follows. First, a photoresist (trade name: AZ-1300; manufactured by Hoechst Japan Co.) was applied to a glass master having a side length of 300 mm and a thickness of 10 mm to a thickness of 300 nm.
Next, groove width 3 μm, pitch 12 μm, depth 2500
プ リ, a preformat pattern corresponding to 2584 track grooves for an optical card whose cross section at an angle (x) of 60 ° is trapezoidal is formed by four 80 mm × 3 on the surface of the resist layer.
Draw by laser cutting machine in the area of 0mm,
After the development processing, Ni was formed to a thickness of 100 nm on the resist layer by sputtering. After that, Ni is further adhered to a thickness of 200 μm by electroforming, the Ni film is peeled off from the resist layer, and the back surface on which the preformat pattern has not been transferred is mirror-polished to a thickness of 150 μm. The stamper 13 was formed by finishing the surface roughness to 0.1 μm.

Next, two stainless steel fixtures 14 each having a length of 10 mm, a height of 5 mm, and a length of 300 mm were laser-welded to both ends of the back surface of the stamper 13 by laser welding. On the back of this stamper, LARC-TP
I (manufactured by Mitsui Toatsu Chemicals Co., Ltd.) is uniformly applied using an applicator, dried with hot air, and then heated to 300 ° C. over 2 hours at a rate of 2 ° C./min. The film was further kept at 300 ° C. for 1 hour to form a 50 μm-thick polyimide resin layer (heat resistant temperature: about 260 ° C., elongation: 8.5%, tensile modulus: 360 kg / mm ² ).

Next, the groove 1 of the roll base material 11 prepared earlier is used.
01, the fixture 14 was inserted, and the stamper was fixed to a mirror roll to form a forming roll. In exactly the same way, another stamper was fixed to the roll base material 11 to produce a forming roll shown in FIG. Example 1 using this forming roll 3
A substrate sheet for an optical card was molded in the same manner as described above.
The molding conditions were such that the conveying speed of the resin sheet was 4 m / min and the surface temperature of the molding roll was changed to 130 ° C., 140 ° C. and 150 ° C.

The three types of substrate sheets thus obtained were evaluated in the same manner as in Example 1, and the results are shown in Table 3.

The thickness unevenness of each substrate sheet was 10 μm or less.

Example 4 An 80 μm-thick tetrafluoroethylene coating film was formed on the peripheral surface of the roll base material produced in Example 1.

Next, after removing the polytetrafluoroethylene in the groove 101 of the roll substrate, the two stampers produced in Example 1 were fixed by inserting the fixture 14 into the groove 101. Using this roll stamper, the surface temperature of the forming roll was changed to 130 ° C., 140 ° C., and 150 ° C., and the other conditions were the same as in Example 1 to mold three types of substrate sheets and evaluated. Table 3 shows the results. The thickness unevenness of each substrate sheet was 10 μm or less.

Example 5 A polyimide resin layer having a thickness of 50 μm was formed on the back surface of the stamper manufactured in the same manner as in Example 1 in the same manner as in Example 3. On the other hand, a polytetrafluoroethylene resin layer having a thickness of 30 μm was formed on the peripheral surface of the roll base material prepared in the same manner as in Example 1 in the same manner as in Example 4. (See FIG. 6) A stamper was fixed to this roll base material, and the surface temperature of the forming roll was changed to 130 ° C., 140 ° C., and 150 ° C. A substrate sheet was formed and evaluated.

Table 3 shows the results.

The thickness unevenness of each substrate sheet is 10 at the maximum.
μm.

[0096]

[Table 4]

Example 6 A roll substrate 11 was produced in the same manner as in Example 1. Two stampers were produced in the same manner as in Example 1. One stamper (stamper A) had a thickness of 150 μm, and the other stamper (stamper B) had a thickness of 125 μm. A 100 μm-thick polyimide sheet (trade name: Corpirex-R; manufactured by Ube Industries, Ltd.) is adhered to the back surface of the stamper A as a resin layer and fixed to the roll base material. A 125 μm polyimide sheet was adhered and fixed to form a molding roll (see FIG. 9).

Using this molding roll, the substrate sheet was molded in the same manner as in Example 1 while changing the temperature of the molding roll to 130 ° C., 140 ° C., and 150 ° C. The transfer accuracy and the birefringence of the preformat pattern transfer portion using the stamper A and the preformat pattern transfer portion using the stamper B of the substrate sheet thus obtained were evaluated in the same manner as in Example 1. Table 4 shows the results.

The thickness unevenness of the substrate sheet was measured by the stamper A.
10μ at the maximum with any transfer part by the stamper B
m or less.

Comparative Example 2 A molding roll was prepared in the same manner as in Example 6 except that the polyimide sheet was omitted, and a substrate sheet was molded using the same.

The preformat pattern transfer portion of the substrate sheet thus obtained by the stamper A and the stamper B
The transfer accuracy and birefringence of the preformat pattern transfer portion greatly changed as shown in Table 4, and it was difficult to form a uniform substrate sheet. The thickness unevenness of the substrate sheet was 10 μm at the maximum in the preformat pattern transfer portion using the stamper A, whereas the thickness unevenness was 40 μm at the maximum in the preformat pattern transfer portion using the stamper B, which was out of the optical card standard.

[0102]

[Table 5]

Example 7 A roll substrate and a stamper were produced in the same manner as in Example 1. Two stampers were prepared, and a 100 μm-thick polyetheretherketone sheet (trade name: TALPA-2000, manufactured by Mitsui Toatsu Chemicals, Inc., 100% elongation, tensile modulus 300 kg / mm ² ) was formed on the back of the stamper.
Were adhered to each other and fixed to a roll substrate.

The forming roll 3 is attached to a forming apparatus shown in FIG. 3, and an amorphous polyolefin (trade name: ZONEX; manufactured by Zeon Corporation) is extruded from an extruder 31 (trade name: SHT90; manufactured by Hitachi Zosen Corporation) to have a thickness of 0. An optical card substrate sheet having a width of 0.4 mm and a width of 30 cm was molded.

The molding conditions are as follows: the temperature of the T-die 32
The surface temperature of the molding roll was set to 140 ° C., the resin sheet conveying speed was set to 3 m / min, and the ratio of the peripheral speed between the molding roll 3 and the mirror roll 35 was set to 1.001, and molding was performed for 5 hours. When the birefringence index of 9 places of each preformat transfer portion of the substrate sheet thus obtained was measured, the average value was 10 m.
m. Regarding the transfer accuracy, the cross-sectional shape in the direction perpendicular to the track groove direction at nine locations of the preformat pattern transfer portion is measured by an electron beam surface morphology analyzer (product name: ESA).
-3000; manufactured by Elionix Inc.)
As shown in the figure, the width of the land portion of the groove transfer portion of the substrate sheet is a, the width of the concave portion for forming the groove of the stamper is A,
(See FIG. 12) and evaluated by the average value of a / A. The results are shown in Table-5. In addition, the same evaluation was performed on a substrate sheet molded at a surface temperature of a molding roll of 130 ° C. and 150 ° C.

Further, the thickness unevenness of each substrate sheet was 10 μm.
m or less, it was within the standard of the optical card substrate. The birefringence was measured using a polarimeter (SP-224; manufactured by Shinko Seiki Co., Ltd.) at a wavelength of 830 nm and a spot diameter of 1 μm.
m and measured with a single pass value. The evaluation criteria are the same as in the second embodiment.

Example 8 In Example 7, a polyphenylene sulfide film (trade name: TORELINA 3000 (100 μm), manufactured by Toray Industries, Inc., 400 kg / mm ² elongation 60% instead of polyether or ether ketone as the resin layer) The molding of an optical card substrate sheet was carried out in the same manner as in Example 7 except for the use of ()).

Example 9 In Example 7, a polyarylate film (trade name: Elmec F-2100 (100 μm), 50% elongation, manufactured by Kanebuchi Chemical Industry Co., Ltd.) was used as the resin layer instead of polyetheretherketone. Except for this, the optical card substrate sheet was molded in the same manner as in Example 7. Table 5 shows the transfer accuracy and birefringence of the optical card substrate thus obtained.

Example 10 The procedure of Example 7 was repeated except that a polyparaetheric acid resin film (trade name: Soldax Tonen Petrochemical Co., Ltd.) having a thickness of 125 μm was used as the resin layer instead of polyetheretherketone. In the same manner as in 7, an optical card substrate sheet was molded.

Example 11 In Example 7, a 100 μm thick polyether sulfone film (trade name: TALPA-1000, Mitsui Toatsu Chemicals, Inc.) was used instead of polyether ether ketone as the resin layer.
An optical card substrate sheet was molded in the same manner as in Example 7, except that an elongation of 100% and a tensile modulus of elasticity of 260 kg / mm ² ) were used. Table 5 shows the transfer accuracy and birefringence of the optical card substrate thus obtained.

[0111]

[Table 6]

Reference Example 1 A molding roll was prepared in the same manner as in Example 3 except that a polyimide layer having a thickness of 7.5 μm was formed as a resin layer, and a substrate sheet for an optical card was prepared.

Reference Example 2 A molding roll was prepared in the same manner as in Example 1 except that a tetrafluoroethylene polymer film having a thickness of 600 μm was used as the resin layer to prepare an optical card substrate sheet. did.

Table 6 shows the transfer accuracy and birefringence of the optical card substrate sheets of Reference Examples 1 and 2.

Reference Example 3 In Example 3, silicone R was used instead of the polyimide resin layer.
A TV rubber (trade name: KE1300: 300% elongation manufactured by Shin-Etsu Chemical Co., Ltd.) was applied to the back surface of the stamper and cured at room temperature to form a resin layer having a thickness of 50 μm. A substrate sheet was molded. The results are shown in Table-6.

[0116]

[Table 7]

[0117]

As described above, according to the present invention, the thermal conductivity of the resin layer (generally 1 × 10 4) can be obtained by interposing the resin layer between the roll substrate and the stamper as a forming roll.
⁻³ to 1 × 10 ⁻⁴ cal / cm · s · ° C.) is a metal roll,
Thermal conductivity of metal stamper (generally 1 × 10 ^-1 to 1 ×
10 ⁻² cal / cm · s · ° C.), the resin layer acts as a heat-insulating layer during molding to suppress a rapid temperature drop of the thermoplastic resin during molding, and as a result, the change in melt viscosity is also suppressed, resulting in molding. The internal distortion of the substrate sheet can be reduced, and the change in the value of the birefringence and the transfer accuracy of the preformat pattern of the substrate sheet due to the fluctuation of the molding conditions such as the temperature fluctuation of the molding roll and the mirror surface roll. Thus, the margin of molding conditions can be increased.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a forming roll of the present invention.

FIG. 2 is a perspective view showing one embodiment of a forming roll of the present invention.

FIG. 3 is a schematic view of an apparatus for manufacturing a substrate sheet for an optical recording medium according to the present invention.

FIG. 4 is a schematic view showing one embodiment of the manufacturing process of the forming roll of the present invention.

FIG. 5 is a schematic view showing another embodiment of the manufacturing process of the forming roll of the present invention.

FIG. 6 is a schematic view showing another embodiment of the manufacturing process of the forming roll of the present invention.

FIG. 7 is a schematic view showing another embodiment of the production process of the forming roll of the present invention.

FIG. 8 is a schematic view showing a manufacturing process of a conventional substrate sheet for an optical recording medium.

FIG. 9 is a schematic sectional view showing another embodiment of the forming roll of the present invention.

FIG. 10 is a schematic view showing a method for manufacturing a forming roll of the present invention.

FIG. 11 is an enlarged cross-sectional view of a preformat forming portion of the optical recording medium substrate sheet according to the present invention.

FIG. 12 is an enlarged sectional view of a stamper on a forming roll surface according to the present invention.

FIG. 13 is a graph showing the relationship between the surface temperature of a molding roll and transfer accuracy.

FIG. 14 is a graph showing the relationship between the surface temperature of a forming roll and the birefringence of a substrate sheet.

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 forming roll 11 roll base material 12 resin layer 13 stamper 14 fixing tool 15 preformat pattern 31 extruder 32 T-die 33 molding resin sheet 34 mirror surface roll 35 mirror surface roll 36 optical recording medium substrate sheet 41 resin sheet 51 resin coating Film 61 Resin coating film 62 Resin coating film 71 Resin coating film 81 T-die 82 Molded resin sheet 83 First roll 84 Mold roll 85 Third roll 101 Groove

Continuing on the front page (72) The inventor Hirofumi Uehara The inside of Canon Inc., 3-30-2 Shimomaruko, Ota-ku, Tokyo (72) The inventor Hitoshi Yoshino 3-30-2, Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) References JP-A-2-251423 (JP, A) JP-A-2-155629 (JP, A) JP-A-2-217233 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) G11B 7/26 521 B29D 31/00 B32B 1/00 (54) [Title of the Invention] Forming roll for substrate sheet for optical recording medium, apparatus for manufacturing substrate sheet for optical recording medium, and for optical recording medium Method for manufacturing substrate sheet, substrate sheet for optical recording medium manufactured by the method, and method for manufacturing optical recording medium

Claims (19)

(57) [Claims] 1. A molding roll for transferring a preformat pattern onto a resin sheet formed by melting and extruding a resin to form a substrate sheet for an optical recording medium, wherein the molding roll comprises a roll base material and the roll base. A molding roll, comprising: a stamper detachably fixed to a material peripheral surface; and a resin layer as a heat insulating layer between the roll base material and the stamper. 2. The molding roll according to claim 1, wherein said resin layer has a thickness of 10 to 500 μm. 3. The molding roll according to claim 1, wherein said resin layer is a resin sheet. 4. The forming roll according to claim 1, wherein said resin layer is formed as a coating film on a surface of said stamper facing said roll base material. 5. The resin layer according to claim 1, wherein the resin layer contains at least one selected from a polyimide resin, a fluororesin, a polyetheretherketone, a polyethersulfone, a polyparabanic acid resin, a polyphenylene oxide, a polyarylate resin and an epoxy resin. Forming roll. 6. The thickness of the resin layer is equal to the thickness of the stamper.
2. The forming roll according to claim 1, wherein the ratio is 0.1 to 2 times. 7. A molding roll for transferring a preformat pattern to a resin sheet formed by melting and extruding a resin to form a substrate sheet for an optical recording medium, wherein the molding roll comprises a roll base material and the roll base. A plurality of stampers detachably fixed to the peripheral surface of the material are provided in the circumferential direction of the roll base material, and a resin layer as a heat insulating layer is provided between the roll base material and each stamper, and A molding roll, wherein the resin layer has a specific thickness corresponding to the thickness of each stamper. 8. The resin layer contains at least one selected from the group consisting of a polyimide resin, a fluororesin, a polyetheretherketone, a polyethersulfone, a polyparabanic acid resin, a polyphenylene oxide, a polyarylate resin, and an epoxy resin. Forming roll. 9. The forming roll according to claim 7, wherein the thickness of the resin layer is 0.1 to 2 times the thickness of the stamper. 10. A means for molding a resin sheet by melting and extruding a resin, a molding roll for pressing the resin sheet to transfer a preformat to the surface of the resin sheet, and a mirror roll arranged opposite to the molding roll. An apparatus for manufacturing a substrate sheet for an optical recording medium, comprising: a roll base ; a stamper removably fixed to a peripheral surface of the roll base ; and the roll base and the stamper. An apparatus for manufacturing a substrate sheet for an optical recording medium, wherein the apparatus is a forming roll provided with a resin layer as a heat insulating layer therebetween. 11. The resin layer contains at least one selected from a polyimide resin, a fluororesin, a polyetheretherketone, a polyethersulfone, a polyparabanic acid resin, a polyphenylene oxide, a polyarylate resin and an epoxy resin. For manufacturing an optical recording medium substrate sheet. 12. A resin sheet is melted and extruded to form a resin sheet.
Means for pressing and pressing the resin sheet on the surface of the resin sheet
Molding roll for transferring preformat and said molding
Optical recording having a mirror roll arranged opposite the roll
In the apparatus for manufacturing a substrate sheet for a medium, the forming roll is
It is detachably fixed to the roll base material and the peripheral surface of the roll base material.
Provided in the circumferential direction of the roll base material.
And between the roll base material and each stamper.
A resin layer is provided as a heat insulating layer, and the resin layer is
Forming roll with unique thickness according to tamper thickness
Production of a substrate sheet for an optical recording medium, characterized by being
apparatus. 13. A resin sheet is formed by extruding a molten resin.
A molding step, and a molding roll for molding the resin sheet.
The tree is pressed by a mirror roll that is placed opposite the roll.
Transferring the preformat to the surface of the grease sheet.
In the method for producing a substrate sheet for an optical recording medium having a roll base, the roll base and the peripheral surface of the roll base are used as the forming rolls.
Equipped with a stamper detachably fixed to the
Resin as a heat insulating layer between the roll base material and the stamper
Optical recording characterized by using a forming roll provided with a layer
A method for producing a substrate sheet for a medium. 14. The resin layer is made of a polyimide resin or a fluorine resin.
Fat, polyetheretherketone, polyethersulf
, Polyparabanic acid resin, polyphenylene oxide
, Polyarylate resin and epoxy resin
14. The base for an optical recording medium according to claim 13, which contains at least one.
A method of manufacturing a sheet. 15. A resin sheet formed by extruding a molten resin.
Molding step, and forming the resin sheet into a molding roll and the molding roller.
The resin is pressed by a mirror roll that is
It has a process to transfer the preformat to the surface of the sheet
In the method for producing a substrate sheet for an optical recording medium , a roll base as the forming roll and a peripheral surface of the roll base are provided.
The stamper fixed detachably is attached to the roll base material.
A plurality of rolls are provided in the circumferential direction,
A resin layer as a heat insulating layer between the tamper and the tamper;
The resin layer has a unique thickness according to the thickness of each stamper
Optical recording medium characterized by using a forming roll having
Of manufacturing substrate sheet for use. 16. A resin sheet extruded from a die,
When the grease sheet is in a substantially molten state,
Has a format pattern and a predetermined surface temperature
Forming roll and roll arranged opposite to the forming roll
And has a birefringence in a predetermined range, and
The preformat pattern is applied to the surface with the transfer accuracy in the range.
In a method for producing a transferred optical recording medium substrate sheet,
The forming roll is provided on the roll substrate and the surface of the preform.
A stamper having a pattern
A resin layer is disposed between the roll base materials, and the resin layer is formed according to the thermal conductivity of the roll base material and the stamper.
Made of a resin having a low thermal conductivity.
The layer inhibits heat conduction from the substrate sheet to the roll substrate
Function as an effective thermal insulation layer, thereby
Having a birefringence within the range, and a transfer accuracy within the predetermined range.
Optical recording medium substrate with preformat pattern transferred
A sheet is provided, and the forming roll is placed on the peripheral surface of the roll substrate.
The stamper is fixed directly without the resin layer
Having the same surface temperature as the predetermined surface temperature
In this case, the birefringence amount exceeding the predetermined birefringence amount,
At least one of the transfer accuracy lower than the transfer accuracy in the specified range
It is intended to provide a board sheet for an optical recording medium having a person
A method for producing a substrate sheet for an optical recording medium, comprising: 17. The light according to claim 10,
Specially, it is manufactured by the manufacturing device of the recording medium substrate sheet.
Substrate sheet for optical recording media. 18. The light according to claim 13,
What is manufactured by the manufacturing method of the recording medium substrate sheet
And a substrate sheet for an optical recording medium. 19. The method according to claim 13, wherein:
To prepare a substrate sheet for optical recording media manufactured by the
About Cutting the substrate sheet for optical recording medium into single sheets, Forming an optical recording layer and a protective layer on the substrate sheet for the optical recording medium;
Process, A method for producing an optical recording medium, comprising: