JP2974453B2 - Roll stamper for molding substrates for optical information recording media - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Rollers for producing substrates for optical information recording media for reproduction
The present invention relates to a roll-type stamper having a sheet-like stamper used for a groove molding method.

[0002]

2. Description of the Related Art Published Patent Publications 56-87203, 56-
As described in 84921 and 52-82204, grooves such as tracking grooves and information pits are formed on the information recording surface of the optical information recording medium substrate.

[0003] As a method of forming such a groove on the substrate for an optical information recording medium, when the material of the substrate for the optical information recording medium is made of a thermoplastic resin, an injection molding method, a compression molding method, a roller groove or the like is used. As a molding method or a method using a 2P resin, a so-called 2P forming method of curing a photo-curable resin composition and transferring a replica of a stamper for forming a groove of an optical information recording medium to a transparent resin substrate is used. A groove molding method, a casting molding method using a resin monomer or a prepolymer containing a solvent, and the like are known.

According to the 2P roller groove molding method, a groove for a track of an optical information recording medium can be formed by a continuous continuous process of a roll-to-roll method.
In this case, a roll stamper for 2P molding for an optical information recording medium is used (hereinafter referred to as a roll stamper for 2P). As described in Japanese Patent Application No. 1-38872 and Japanese Patent Application No. 1-338346 filed by the present applicant, the roll-type stamper for 2P is obtained by bonding a paper-like glass stamper produced by a photolithography technique with an adhesive. It is obtained by fixing on a roll using a heat-shrinkable tube or a shape memory alloy.

In the above-mentioned roller / groove molding method,
Roll-to-groove tracks for optical information recording media
A roll-type stamper for molding an optical information recording medium is used for forming in a continuous continuous process of a roll method (hereinafter, referred to as a roll-type stamper). As described in Japanese Patent Application No. 63-264991 filed by the present applicant, this roll-type stamper is obtained by subjecting a roll to close contact exposure using a paper-like glass mask and directly engraving.

However, in the roll stamper obtained by direct engraving described above, a predetermined pattern (tracking groove, information pit, etc., spiral) formed on a plurality of optical information recording media is applied to one roll stamper. , Concentric or striped pattern), for example, if a defect occurs in a predetermined pattern of one to several optical information recording media, it is necessary to replace the roll stamper. In a roll type stamper in which a predetermined pattern of the optical information recording medium described above is formed by direct engraving, the utilization efficiency of the predetermined pattern per optical information recording medium is very poor. Further, in order to improve the production efficiency, more predetermined patterns of the optical information recording medium must be directly formed on one roll-type stamper by stamping.
For this reason, the roller diameter of the roll-type stamper is increased, the weight is increased, and replacing one roll-type stamper requires a large amount of labor.

Conventionally, in order to solve such a drawback, as described in Japanese Patent Application No. 63-285873, a sheet-shaped stamper is manufactured by electroforming, and the sheet-shaped stamper is made of a shape memory alloy. There has been proposed a roll-type stamper which is used and is fixed to a roll via an adhesive. Further, with a similar configuration, as described in Japanese Patent Application No. 1-38872, a paper-like glass stamper manufactured by photolithography is fixed to a roll via an adhesive using a heat-shrinkable tube. The resulting roll stamper has also been proposed.

[0008]

However, the above-mentioned prior art is obtained by fixing a plurality of sheet stampers for molding optical information recording media to a roll via an adhesive (for 2P). ), There were the following problems. (1) When a defect occurs in one or more sheet-shaped stampers for molding optical information recording media or paper-shaped glass stampers (hereinafter, referred to as sheet-shaped stampers), the defective sheet-shaped stampers must be replaced. However, it takes about 4 hours to fix the new sheet-shaped stamper to the roll, during which time the roller / groove molding machine stops, resulting in wasteful time and extremely low production efficiency. (2) One method is to prepare a new and re-applied roll-type stamper and perform rotation. However, in order to improve production efficiency, one roll-type stamper requires more sheets. The stamper must be fixed. Therefore, the roller diameter of the roll-type stamper becomes large and the weight increases, and replacing the roll-type stamper requires a large amount of labor. (3) Even if the sheet-shaped stamper is fixed, the work in the bonding process becomes more difficult as the roller diameter increases, and if the bonding and fixing device is required, the size of the bonding and fixing device may be increased. Is done. Therefore, equipment costs, personnel costs, and the like increase. (4) The adhesive is likely to protrude from the sheet-shaped stamper, and it takes much effort to remove the adhesive. Further, if the roller / groove molding is performed in a state in which the adhesive has protruded, a change over time occurs in about 20 hours, and the adhesive itself causes a defect. (5) When molding the optical information recording medium, the centering adjustment of the sheet-like stamper on the molten resin sheet serving as the base material is performed by:
This must be done by moving either a large and very heavy roll stand or an extruder, making the centering adjustment difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and facilitates the mounting and replacement of a sheet-shaped stamper, improves the molding cost, and improves the mirror-like roll of the sheet-shaped stamper. Positioning,
That is, an object of the present invention is to provide a roll-type stamper for molding a substrate for an optical information recording medium, which can easily perform centering adjustment.

[0010]

According to the present invention, there is provided a sheet-shaped stamper for transferring a fine uneven pattern onto an optical information recording medium substrate; A mirror-finished roll in which a plurality of grooves to which the respective fixing members of the sheet-shaped stamper can be fitted are extended in the axial direction on a peripheral surface; and each fixing member of the sheet-shaped stamper is mirror-finished. At least one fixing member side for applying tension in the circumferential direction of the mirror-like roll to the sheet-like stamper and positioning the sheet-like stamper in the axial direction of the mirror-like roll in a state of being fitted in each groove of the roll. Tension fixing means provided on the mirror; and fixing at least one fixing member to the mirror roll in a state where the sheet-shaped stamper is positioned in the axial direction of the mirror roll by the tension applying means. Fixing means, a roll-type stamper for molding a substrate for an optical information recording medium, wherein the tension applying means includes both end faces of a mirror roll so as to cover both ends of one groove into which at least one fixing member is inserted. A pair of fixing members respectively fixed to both ends of the one groove, each end of which can be inserted between both ends of at least one fixing member and one side wall of the one groove. And a pressing screw which is screwed to each fixing member and whose tip is in contact with each wedge and can press, respectively, and the fixing means is formed on at least one fixing member material. An elongated hole extending in the axial direction, a screw hole formed in the mirror surface roll, opening in the bottom wall of at least one groove, and a fixing screw passing through the elongated hole and screwing into the screw hole. That And it features.

[0011]

[0012]

According to the present invention constructed as described above, the fixing members provided at both ends of the sheet-shaped stamper are inserted into the respective grooves of the mirror-finished roll, and the sheet-shaped stamper is brought into close contact with the peripheral surface of the mirror-finished roll. Let it. And by the tension applying means,
Apply circumferential tension of the mirror roll to the sheet-like stamper,
In this state, the sheet-like stamper is moved in the axial direction of the mirror roll and positioned at a predetermined position in the axial direction, and then at least one fixing member is fixed to the mirror roll by a fixing means.

In order to align, ie, center, the sheet-shaped stamper with the molten resin sheet serving as the substrate material when molding the optical information recording medium substrate, the fixing of the sheet-shaped stamper by the fixing means is released, and the tension applying means is provided. While applying tension to the sheet-shaped stamper, the sheet-shaped stamper is slightly moved in the axial direction so that the center line thereof coincides with the center line of the molten resin sheet. After that, the sheet-shaped stamper is fixed to the mirror roll by the fixing means.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a long flexible sheet stamper 3 is for transferring a pattern onto an optical information recording medium substrate (not shown), and has a predetermined pattern 3a formed on its upper surface. Rod-shaped fixing members 1 and 2 are fixed to the lower surfaces of both ends of 3b, respectively. The length of each fixing member 1 and 2 is longer than the width of the sheet 3b, and one fixing member 1 has three long holes 1
a, 1b, and 1c are formed at equal intervals in the axial direction, and the corners at both ends are cut off.

As shown in FIGS. 2 and 3 (A) and (B), the mirror roll 5 is configured so that a heat medium circulates inside the mirror roll 5. 2 (see FIG. 1), two grooves 5a and 5b into which the fixing members 1 and 2 can be fitted respectively extend in the axial direction (the direction of the arrow X). Both ends of each groove 5a, 5b reach the end face of the mirror roll 5, and their cross-sectional shapes are each rectangular. Each of the grooves 5a and 5b is formed by a method such as electric discharge machining, bite machining, and dress machining. The mirror roll 5 has screw hole groups 4a, 4a that open in the bottom wall of one groove 5a.
b, 4c are formed at intervals equal to the intervals of the long holes 1a, 1b, 1c (see FIG. 1), and each screw hole group 4a, 4b, 4c has three screw holes 6a, 6b, 6c (see FIG. 1). 3 (A)). The pitch P of each screw hole 6a, 6b, 6c is the same as that of the slot 1a, 1b,
A little less than half the length of 1c, that is, long holes 1a, 1b, 1c
Is slightly more than twice the pitch P of the screw holes 6a, 6b, 6c. Note that two grooves are also formed in a portion opposite to a part of the peripheral surface of the mirror roll 5 in which the two grooves 5a and 5b are formed.

As shown in FIGS. 4, 5 and 6, the fixing members 1 and 2 of the sheet-like stamper 3 are inserted into, for example, the grooves 5a and 5b from one end of the mirror roll 5, respectively. When the axial centers of the components 1 and 2 are aligned with the centers of the grooves 5a and 5b, respectively,
a, 1b, and 1c correspond to the screw hole groups 4a, 4b, and 4c, respectively. In this state, the center line of the sheet stamper 3 matches the center line of the mirror roll 5. In the present embodiment, than the width L ₁ of seat 3b of the sheet-like stamper 3 and towards the length L ₂ is longer fixtures materials 1 and 2, the length L ₃ of the mirror roll 5 is fixed ingredient 1 , it is longer than the second length L _2.

In both ends of one groove 5a, wedges 7a and 7b are provided between both ends of one fixing member 1 and one side wall of the groove 5a so that respective tips (a sharp corner) can be inserted. Have been. Further, fixing members 8a and 8b are detachably screwed to both side surfaces of the mirror roll 5 so as to cover both ends of one groove 5a into which one fixing member 1 is inserted. A threaded hole is formed in the center of 8b. Pressing screws 9a and 9b are screwed into respective screw holes of the fixing members 8a and 8b, respectively, and the tips of the pressing screws 9a and 9b are wedges 7 respectively.
a, 7b and can be pressed. Each pressing screw 9a,
When the wedges 7a and 7b are pushed in the direction approaching each other by the 9b, the respective ends of the wedges 7a and 7b are mirror-finished rolls 5 of the two side walls of the groove 5a that are not covered by the sheet-like stamper 3. Between the two side walls of the fixing member 1 and one side wall of the fixing member 1,
Becomes wider. As a result, the circumferential tension of the mirror roll 5 is applied to the sheet 3b of the sheet stamper 3, and the sheet 3b is uniformly adhered to the circumferential surface of the mirror roll 5. Further, by adjusting the screwing depth of each of the pressing screws 9a and 9b to the fixing members 8a and 8b, the sheet-shaped stamper 3 can be positioned in the axial direction of the mirror roll 5 (the direction of the arrow X).

As is clear from the above description, the two wedges 7a and 7b, the fixing members 8a and 8b, and the pressing screws 9a and 9
By b and the like, a tension applying means for applying a circumferential tension of the mirror roll 5 to the sheet stamper 3 and positioning the sheet stamper 3 in the axial direction of the mirror roll 5 is configured.

With the sheet-shaped stamper 3 being tensioned in the circumferential direction of the mirror roll 5 by the action of the wedges 7a and 7b, the fixing screws 10a, 10b and 10c are inserted into the slots 1a and 1b of the fixing member 1. , 1c respectively, and screw holes 6a, 6b, 6 at the center of each screw hole group 4a, 4b, 4c.
By screwing each of the fixing members 1 to c, the fixing member 1 can be securely fixed to the mirror roll 5, and the lifting of the fixing member 1 due to the tension can be prevented. Each fixing screw 10a, 10
b, 10c do not protrude from the surface of the sheet stamper 3,
It is configured so as not to hinder transfer described later.

As is clear from the above description, the fixing member 1 is fixed to the mirror roll 5 by three long holes 1a, 1b, 1c, screw hole groups 4a, 4b, 4c, fixing screws 10a, 10b, 10c and the like. Fixing means are provided.
In addition, another sheet-shaped stamper (not shown) similar to the sheet-shaped stamper 3 is also adhered to a part opposite to a part of the peripheral surface of the mirror roll 7 to which the sheet-shaped stamper 3 is adhered. Although the roll-type stamper provided with two sheet-like stampers is shown, the invention is not limited to this, and the number of sheet-like stampers may be one or other.

Next, with reference to FIGS. 7, 8 and 9, a method for manufacturing the above-described sheet stamper will be described.

First, a photoresist 12 is formed on a glass substrate 11 such as a soda lime glass (see FIG. 7A). As the photoresist 12, Az 1370 (Hoechst Japan) was dropped onto the glass substrate 11 and applied to a thickness of 3000 × 10 ⁻⁷ mm using a spinner. Thereafter, prebaking was performed at a temperature of 90 ° C. for a time of 30 minutes. Next, using a laser exposure apparatus, specifically, an exposure apparatus of a mirror projection mask aligner (trade name: MPA-1500: manufactured by Canon), the photoresist 12 is exposed and transferred to an information recording medium substrate. A plurality of fine patterns (stripes) are formed and developed with a developing solution Az312MIF (Company name: Hoechst Japan) to form uneven fine patterns such as tracking grooves and information pits. A sheet-shaped glass master 13 for a card is manufactured (see FIG. 7B).

Further, as a pretreatment for forming a metal film by an electroforming method, a conductive treatment is performed using a film forming apparatus such as a sputtering apparatus and a vapor deposition apparatus. Here, a film thickness of 100
A conductive film 14 was formed on the glass master 13 by forming a nickel film of 0 × 10 ^{−7 to} 2000 × 10 ⁻⁷ mm by a sputtering device (see FIG. 7C). Next, a nickel metal film 15 is formed on the glass master 13 on which the conductive film 14 has been formed by electroforming. At this time, first, the nickel chip in the electroforming tank (not shown) is set to the plus side electrode, and the glass master 13 provided with the conductive film 14 is set to the minus side electrode. As the electrode plate, an outer peripheral electrode plate 16 as shown in FIG. 8 is used, and the glass master 13 and a power supply are energized. The outer electrode plate 16 is used because the film thickness distribution of the metal film 15 is better than that of the inner electrode plate. Then, in a nickel sulfamate electroforming solution, the glass master 13 on which the conductive film 14 has been formed is rotated at 20 to 30 rpm.
While rotating at a rotation speed of
100- under the condition of 0-300AH (ampere hour)
Nickel metal of 200 μm was deposited to form a metal film 15 (see FIG. 7D). The electroforming solution used here has the following composition.

Nickel sulfamate tetrahydrate [Ni
_{(NH 2 SO 3) 2 ·} 4H 2 O]: 500g / l, boric acid _{[H 3 BO 3]: 35~38g} / l, a pit preventing agent: 2.
5 ml / l.

Finally, the conductive film 14 and the metal film 15 are peeled off from the glass substrate 11 in an integrated state,
Photoresist 12 adhering to the surface (FIG. 7B
Line) by removing and cutting off the end.
And space: 9.5 μm / 2.5 μm, step: 2
A sheet 3b on which a predetermined pattern 3a having a stripe shape of 500 × 10 ^{−7 to} 3000 × 10 ⁻⁷ mm was obtained (see FIG. 7E). Next, as shown in FIG.
A fixture 1 and a fixture 2 in which two long holes 1a, 1b, 1c are formed are prepared. Each of the fixing members 1 and 2 is made of a steel material plated with Ni.

Using the above-described sheet 3b, the fixing members 1 and 2 obtained by plating steel with Ni are fixed by welding.
As a welding method, fixing is performed by a method such as EB welding (electron beam welding), silver brazing welding, or YAG laser welding.

As shown in FIG. 9, the fixing members 1 and 2 are inserted into the two grooves 17a and 17b of the lower plate 17 of the welding jig 19, respectively. Next, the welding surface of the sheet 3b (corresponding to the back surface on which a fine pattern of concavities and convexities such as tracking grooves and information pits is not applied) and the welding surfaces of the fixing members 1 and 2 are aligned. Jig 19 in which two slits 18a and 18b for passing a beam are formed.
8 is mounted and screwed with a plurality of screws 20a, 20b to complete the setting. After that, the EB welding device E
Using a BW6LB (manufactured by Mitsubishi Electric Corporation), EB welding was performed on the sheet 3b that had been completely set, and the sheet 3b was fixed to each of the fixing members 1 and 2 to obtain a long flexible sheet stamper. The EB welding conditions are as shown below.

Degree of vacuum: 5 × 10 ^-2 Torr Accelerating voltage: 60 Kv Beam current: 3.2 mA Beam speed: 4.0 m / min Under these conditions, when a large distortion occurs in the sheet b, the electron beam is turned on. The welding may be performed in the form of a pulse. The pulse beam conditions are as follows: frequency: 60 Hz, duty: 20 to 50%, deflection device volume: 100
mV, offset: 50 mV.

Next, the case of performing YAG laser welding will be described. Similarly to the above-mentioned EB welding, the welding surface of the sheet 3b and the welding surfaces of the fixing members 1 and 2 are aligned, and the upper lid 18 of the welding jig 19 is attached from above, and the screws are screwed to complete the setting. Then, the welding jig 19 is moved to XY.
Attach it to the stage (not shown). This XY stage is
It should be linked with the YAG laser welding device. Y
The sheet 3b is YAG laser-welded using an AG laser welding apparatus ML-2220A (manufactured by Miyaji Laser System Co., Ltd.), and fixed to the fixing members 1 and 2. The YAG laser welding conditions are as shown below.

Charge voltage: 350 V Pulse width: 1.0 ms Defocus: 5 mm REP-RATE (PPS): 20 Power: 35 W to 65 W Next, the case of performing silver solder welding will be described. Sheet 3
b, the welding surfaces are joined together via a silver brazing foil between the welding surfaces of the fixing members 1 and 2 and 20 to 50 from above.
Pressurize Kg / cm ² to complete the setting. After the setting is completed, the degree of vacuum is set to 2 × 10 using a vacuum heating furnace.
^The silver soldering is performed under the conditions of ^-5 Torr, peak heating temperature: 820 ° C., heating time: 7 h, and the sheet 3b and the fixing members 1 and 2 are fixed.

The fixing method of the sheet 3b and each of the fixing members 1 and 2 is not limited to the above-mentioned method, but may be a low melting metal,
It can also be fixed by using a method such as low melting point glass, heat resistant adhesive, screwing or clamping.

FIG. 10 is a perspective view of a main part of a molding apparatus provided with a roll-type stamper for molding a substrate for an optical information recording medium according to the present embodiment. FIG. It is a figure for explaining an eccentric state.

As shown in FIG. 10, the T-die 21 of the extruder
The molten resin sheet 22, which is a base material extruded from the mold, enters between the mirror roll 24 and the roll-type stamper 23 in a molten or softened state, is pressed and cooled, and is pressed between the roll-type stamper 23 and the mirror-like roll 25 by an arrow Y. Pulled out in the direction. At this time, the predetermined pattern 3a (see FIG. 1) having an uneven shape provided on the surface of the sheet stamper 3 is precisely transferred to the molten resin sheet 22. The center line BB of the sheet-shaped stamper 3 is changed to the center line AA of the molten resin sheet 22 due to the displacement of the roll-type stamper 23 or the like.
If the eccentricity does not coincide with the eccentric amount e, the centering adjustment described below is performed. Here, a method of adjusting the centering when the eccentric direction of the sheet stamper 3 with respect to the molten resin sheet 22 is the direction of the arrow Z in FIGS. 5 and 11 will be described.

As shown in FIG. 5, the screw hole groups 4a, 4b,
The three fixing screws 10a, 10b, 10c respectively screwed into the screw holes 6a, 6b, 6c at the center of 4c are loosened, respectively, and the fixing of the fixing member 1 by the fixing screws 10a, 10b, 10c is released. . One pressing screw 9b in the direction opposite to the eccentric direction, that is, in the direction opposite to the arrow Z is loosened by the eccentric amount e (see FIG. 11). Thereafter, by loosening the other pressing screw 9a by the eccentricity e, the one fixing member 1 is moved in a direction opposite to the eccentric direction, that is, in the direction opposite to the arrow Z, while the sheet-shaped stamper 3 is under tension. And the other fixing member 2 is also finely moved by the amount of eccentricity e in the direction opposite to the arrow Z.

Finally, three fixing screws 10a, 10b,
10c is tightened to fix the fixture 1 to the mirror roll 5. The molten resin sheet 2 of the sheet stamper 3
If the eccentric direction with respect to 2 is the direction opposite to the arrow Z, an operation reverse to the above-described operation is performed. If the amount of eccentricity e is large, the screw holes 6a, 6 at both ends of the screw hole groups 4a, 4b, 4c
b and 6c are used.

In the roller / groove molding, since the molding temperature condition is 125 ° C. to 145 ° C., when the set temperature is reached, the pressing screws 9a and 9b are tightened again to adjust the tension applied to the sheet stamper 3. It is desirable to do.

In this embodiment, the one in which the tension applying means and the fixing means are provided only on one fixing member side is shown. However, the present invention is not limited to this, and it may be provided on the other fixing member side. .

[0039]

Since the present invention is configured as described above, the following effects can be obtained.

(1) When a defect occurs in the sheet stamper, only the sheet stamper can be easily replaced, and the production efficiency is improved.

(2) Since no adhesive is used, no defect is caused by the adhesive itself.

(3) It is not necessary to introduce a large device such as an adhesive fixing device to produce a roll-type stamper, and a roll-type stamper can be provided at low cost. By molding, the manufacturing cost of the optical information recording medium substrate is reduced.

(4) The positioning of the sheet stamper with respect to the mirror roll, that is, the centering adjustment of the sheet stamper to the substrate material can be easily performed.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a sheet-shaped stamper according to one embodiment of a roll-shaped stamper for molding a substrate for an optical information recording medium of the present invention.

FIG. 2 is a schematic perspective view of a mirror roll according to the present embodiment.

FIGS. 3A and 3B are views showing main parts of FIG. 2, wherein FIG. 3A is a top view near one groove, and FIG. 3B is a cross-sectional view of FIG.

FIG. 4 is a schematic perspective view of a roll-type stamper for molding a substrate for an optical information recording medium.

FIG. 5 is a top view showing a structure for fixing one end of the sheet-like stamper shown in FIG. 4;

FIG. 6 is a sectional view of FIG. 4;

FIG. 7 is a process chart for explaining each process of the method of manufacturing the sheet-like stamper shown in FIG. 1;

FIG. 8 is a perspective view showing a state in which an outer peripheral electrode plate is attached to a glass master in an electroforming process.

FIG. 9 is a schematic view of a welding apparatus for explaining a step of welding a fixing member to a sheet.

FIG. 10 is a perspective view of a main part of an apparatus for molding a substrate for an optical information recording medium.

FIG. 11 is a view for explaining an eccentric state of a molten resin sheet extruded from a T-die and a roll type stamper in FIG.

[Explanation of symbols]

 1, 2 Fixing material 1a, 1b, 1c Slot 3 Sheet stamper 3a Predetermined pattern 3b Sheet 4a, 4b, 4c Screw hole group 5 Mirror roll 5a, 5b Groove 6a, 6b, 6c Screw hole 7a, 7b Wedge 8a, 8b fixing member 9a, 9b pressing screw 10a, 10b, 10c fixing screw 11 glass substrate 12 photoresist 13 glass master 14 conductive film 15 metal film 16 outer peripheral electrode plate 17 lower plate 17a, 17b groove 18 upper cover 18a, 18b slit 19 welding Tool 20a, 20b Screw 21 T-die 22 Molten resin sheet 23 Roll type stamper 24, 25 Mirror roll e Eccentricity AA, BB Center line

Continuation of the front page (72) Inventor Hisanori Hayashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Within Canon Inc. (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 7/26 511 B29C 33 / 42 B29C 43/46 B29C 59/04

Claims (1)

(57) [Claims] 1. A sheet-shaped stamper for transferring a fine concavo-convex pattern onto an optical information recording medium substrate; fixing members fixed to the back surfaces of both ends of the sheet-shaped stamper; fixing members of the sheet-shaped stamper A mirror surface roll in which a plurality of grooves into which materials can be respectively fitted are extended in the axial direction on the peripheral surface; the sheet-like stamper in a state where each fixing member of the sheet-like stamper is inserted into each groove of the mirror surface roll; Tension applying means provided on at least one of the fixing members for applying a circumferential tension of the mirror roll to the stamper and positioning the sheet-shaped stamper in the axial direction of the mirror roll; A roll for forming a substrate for an optical information recording medium, the fixing means for fixing at least one of the fixing members to the mirror roll while the stamper is positioned in the axial direction of the mirror roll. A mold stamper, wherein the tension applying means includes fixing members fixed to both end surfaces of the mirror-finished roll so as to cover both ends of one groove into which at least one fixing member is inserted; A pair of wedges, each of which can be inserted between both end portions of at least one fixing member and one side wall of the one groove, are screwed to the fixing members, respectively, provided at both ends. The fixing means is formed in at least one fixing member, an elongated hole extending in the axial direction, and a mirror-finished roll. Was
A roll for forming a substrate for an optical information recording medium, comprising: a screw hole opened in a bottom wall of at least one groove; and a fixing screw penetrating the long hole and screwing into the screw hole. Mold stamper.