JPH03219441A - Long stamper and its manufacturing method - Google Patents

Abstract

PURPOSE:To easily perform the loading and the exchange of a stamper by fixing the stamper fitting in the recessed part of a sheet base material having the recessed part and with uniform thickness on a recessed part. CONSTITUTION:Three recessed parts with the depth of 0.1mm and the size of 100X100mm are provided on a nickel sheet with thickness of 0.3mm and size of 200X500mm by press molding, and a sheet 1 with entire thickness of 0.2mm is manufactured by grinding a side without having the recessed part. Also, a nickel stamper 2 with the thickness of 0.07mm and the size of 100X100mm on which a pattern for optical card is provided is manufactured. A soldered alloy sheet 4 with the thickness of 0.03mm, size of 100X100mm, and m.p. of 250 deg.C is inserted to the recessed part 3 of the sheet 1, and the stamper is placed on it, and after that, the stamper is protected with polyimide film, then, it is heated upto to 300 deg.C while applying pressurization, and the stamper 2 is fixed on the sheet 1. This long-sized stamper 5 can be obtained by fixing the stampers on another two recessed parts 3', 3'' similarly, as well.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a long stamper used in a roller grooving method for continuously manufacturing optical information recording media, and a method for manufacturing the same.

[Prior art] Conventionally, published patent publication 56-87203.56-8492
1.5282204, the optical information recording medium substrate has tracking grooves on its information recording surface.
Groups of information bits, etc. are formed.

Methods for forming such groups on the substrate for optical information recording media include: - When the material for the substrate for optical information recording media is made of thermoplastic resin, injection molding, compression molding, and roller group molding are used. or (2) A method using 2P resin, in which a photocurable resin composition is cured and a replica of a stamper for forming groups of an information recording medium is transferred onto a transparent resin substrate.
A forming method, a 2P roller group molding method, and (2) a cast molding method using a resin monomer or a prepolymer containing a solvent are known.

In the above 2P roller group forming method, in order to form the track groups of the optical information recording medium in a continuous roll-to-roll process,
A roll-type stun bar for P molding is used (hereinafter referred to as 2P
(referred to as a roll-type stamper).

This method of manufacturing a roll type stamper for 2P is disclosed in Japanese Patent Application No. 1-38872 and Japanese Patent Application No. 1-3839 filed by the present applicant.
As described in 6, a paper-like glass stamper is produced using photolithography technology, and is stamped with an adhesive.
This can be done by fixing a heat shrink tube or a shape memory alloy on the roller.

In the roller group forming method (2) above, a roll-type stamper for forming optical information recording media is used to form track groups of optical information recording media in a continuous roll-to-roll process (hereinafter referred to as (referred to as a roll stamper).

The manufacturing method of this roll type stamper is as described in Japanese Patent Application No. 63-264691 filed by the present applicant, in which the roller is exposed to light using a paper-like glass mask.
A roll stamper can be manufactured by direct stamping.

However, in the above-mentioned method of manufacturing a roll stamper by direct engraving, one roll stamper is used to print a predetermined pattern (a spiral pattern consisting of tracking grooves, information bits, etc.) on a plurality of information recording media. , concentric circles or striped patterns) are formed,
For example, if a defect occurs in the predetermined pattern of one or several information recording media, one roll-type stamper will have to be replaced, and the roll-type stamper that has been directly stamped with the predetermined pattern of multiple information recording media will have to be replaced. In stampers, the utilization efficiency of a predetermined pattern of each information recording medium is very low.

Furthermore, in order to improve production efficiency, it is necessary to form predetermined patterns of more information recording media on one roll stamper by direct stamping. For this reason, the roller diameter of the roll stamper becomes larger and the weight increases, and it is difficult to replace one roll stamper.
The drawback was that it required a lot of effort.

In order to solve these drawbacks, the same patent application No. 63-285
873, a method has been proposed in which a sheet-like stamper is produced by electroforming and fixed to a roller using an adhesive and a shape memory alloy.

In addition, with a similar structure, as described in the same patent application No. 1-38872, a paper-like glass stamper is produced by photolithography technology and fixed to a roller with an adhesive using a heat shrink tube. A method has also been proposed.

[Problems to be Solved by the Invention] However, in the above conventional example, by fixing a plurality of sheet-shaped stampers for molding optical information recording media to a roller with an adhesive between them, a roll-type stamper ( 2
(including those for P), there were the following drawbacks.

(1) If a defect occurs in one or several sheet-shaped stampers or paper-shaped glass stampers (hereinafter referred to as sheet-shaped stampers) for molding optical information recording media, the defective sheet-shaped stamper must be replaced, but
It takes about 4 hours to fix a new sheet stamper to the rollers, and during this time the roller group forming device has to be stopped, resulting in wasted time and very inefficient.

(2) One method is to prepare a new, reattached roll stamper and rotate it, but in order to improve production efficiency, it is necessary to use more roll stampers on one roll stamper. The sheet stamper must be fixed. For this reason, the diameter of the roller of the roll-type stamper has increased, the weight has increased, and it has been disadvantageous that replacing one roll-type stamper requires a large amount of labor.

(3) Even when fixing a sheet stamper, as the diameter of the roller increases, work in the gluing process becomes more difficult, and if an adhesive fixing device is required, the adhesive fixing device must also be larger. There are concerns. Therefore, the equipment cost,
Personnel costs, etc. may increase.

The present invention has been made in view of the problems of the conventional roll-type stamper, and provides a long stamper having a novel configuration that facilitates attachment and replacement of the stamper, and a method for manufacturing the same. It is.

[Means for Solving the Problems] The present invention provides a long stamper for use in a roll-type stamper for molding optical information media, which comprises a sheet-like base material having a uniform thickness and having at least one recess. The elongated stamper is characterized in that a stamper that fits into the recess is fixed to the recess, and the method for manufacturing the elongated stamper includes a sheet having a uniform thickness. At least one recess is provided in a shaped base material, a stamper that fits into the recess is attached to the recess via an adhesive member, and then the stamper is pressurized and/or heated. The method for manufacturing the long stamper is characterized in that the long stamper is fixed to a material. According to the present invention, it is possible to simplify stamper replacement work and improve stamper productivity.

In the present invention, the recesses provided in the sheet-like base material are
There are four parts for embedding the stamper, and after embedding there is no step between the stamper and the sheet-like base material.
and the base material are integrated. That is, the shape of the recesses is such that the stampers can fit therein, and the number of recesses is the same as the number of stampers required. Here, regardless of the size of the long stamper, it is sufficient to individually create the stamper according to the size of the target optical information recording medium, and basically one stamper is used for one optical information recording medium. However, depending on the case, a stamper with two or more stamps may be used. Further, as a means for fixing to the recess, an adhesive member or the like may be used, placed between the stamper and the four parts, and fixed by a predetermined means.

As the material of the sheet-like base material, metals such as nickel, alloys such as stainless steel, heat-resistant plastics, ceramics, etc. can be used, and as the material of the stamper, metals such as nickel, alloys such as stainless steel, glass, etc. Ceramics, heat-resistant plastics, etc. can be used, and the materials of the sheet-like base material and the stamper can be selected independently. However, it is preferable to use the same material to make the long stampers for reasons such as the occurrence of warpage due to differences in thermal expansion coefficients.

The sheet-like base material (hereinafter abbreviated as sheet) is a sheet with a uniform thickness, but the thickness is 0.1 to 1.0 mm.
It may be set as appropriate depending on the strength, the groove depth of the recessed portion, the length of the sheet (that is, the outer peripheral length of the roller used in the roll stamper), etc.

At least one or more recesses are provided on the sheet, but usually about 2 to 10 recesses may be provided. Also, the groove depth of the recess is 0.05~
About 0.5 fights is enough.

Next, as a means for fixing the stamper, screws or the like may be used, but it is preferable to use a material that can sufficiently firmly bond the stamper and the sheet as an adhesive member, such as metals such as 5nZn or the like. It is preferable to use a low melting point metal such as an alloy because it enables adhesion by heating, uniform thickness adhesion by film solder, etc., and the stamper can be easily removed by heating.

Furthermore, if a polymer adhesive such as silicone, epoxy, or cyanoacrylate is used, it is possible to easily bond with a uniform thickness. If these adhesive members are liquid, they may be applied to the entire bottom of the recess, and if they are plate-shaped, they may be placed over the entire bottom. The amount of coating, the thickness of the plate, etc. may be appropriately set depending on the type of adhesive member.

To produce a long stamper having the above configuration, a sheet of a predetermined size manufactured by a conventional method is provided with recesses of a predetermined size and number by press molding, etc., and if necessary, the surface of the sheet without recesses is polished. Make the overall thickness uniform.

Next 1. A predetermined size and number of stampers are prepared using a known technique such as creating a master by laser cutting or exposure and then electroforming, and after placing an adhesive member on the bottom of the recess, the stamper is -, a polymer film or the like is covered thereon if necessary to protect the pattern of the stamper, and then the stamper is integrated with the sheet by applying pressure and/or heating. Here, the stamper is a conventional long stamper.
Unlike the stamper itself, which is approximately the same size as the optical recording medium, known mastering techniques can be used regardless of the size of the long stamper, making it extremely simple and offering high quality stability and accuracy. .

If the obtained long stamper is fixed to the outer peripheral surface of the roller using a fixing jig such as a screw, a roll-type stamper for molding an optical information recording medium can be produced without using an adhesive or the like. If a substrate is formed using the roller grooving method using this roll type stamper, fine patterns can be transferred with high precision.Also, when replacing a long stamper, since it is not fixed with adhesive, it is necessary to use a fixing jig. This can be done simply by removing it.

[Example] The present invention will be explained below with reference to Examples.

Example 1 FIG. 1 is a schematic diagram showing a method for manufacturing a long stamper of the present invention. 1 is a sheet of uniform thickness with recesses, 2 is a stamper 13, 3°, and 3'' is a recess.

A nickel sheet with a thickness of 0.3 mm and a size of 200 mm x 500 mm is press-molded to a depth of 0.1 mm.
Three recesses each measuring 100 mm in size and 100 mm in depth were provided. The side of this sheet without recesses was polished to a total thickness of 0.2 mm.

In addition, conventionally known methods such as master disk creation by laser cutting - conductive treatment by sputtering nickel 1]2 on the pattern surface -> nickel electroforming -> back polishing ->
Through processes such as outer diameter processing, a pattern for optical cards is created with a thickness of 0.07 mm and a size of 100 mm x 100 m.
m nickel Stanverse was prepared.

Thickness 0.03mm and size 100mm in recess 3 of sheet 1
Insert a solder alloy sheet 4 with a size of 100 mm and a melting point of 250°C, place the stamper 2 on top of it, protect the stamper pattern with a polyimide film, and heat it to 300°C while applying pressure to attach the stamper to the sheet 1. −
2 was fixed.

Stamp the other two recesses 3' and 3'' in the same way.
was fixed to obtain a long stamper 5 as shown in FIG.

As shown in FIG. 3, a long stamper 5 was fixed to a roller 6 using a stamper fixing jig 7 to produce a roll stamper.

When an optical card substrate was molded using this roll type stamper by a roller grooving method, a substrate was obtained in which a fine pattern of concavities and convexities of the long stamper 5 was accurately transferred.

Example 2 Using a photomask containing an optical card pattern and a mask aligner (PLA501FAB), a glass master disk spin-coded with a photoresist (AZ1370, manufactured by Hoechst Japan) to a film thickness of 3000 mm was exposed, and a developer solution (
A2312MIF (manufactured by Hoquist Japan) was used to create a glass master disk containing an optical card pattern. The pattern on this master disk was chemically plated to make it conductive, and then nickel was applied to it to make it conductive.
Electroformed to a thickness of 1mm, polished and processed to an outer diameter of 80mm.
A stamper having a width of 100 mm and a thickness of 0.08 mm was obtained.

On the other hand, thickness 0.2mm, size 250mm x 50
Depth 0.1 by cutting and polishing on a 0mm nickel sheet
Eight recesses with a size of 80 mm x 100 mm were provided. A cyanoacrylate adhesive (5C55 manufactured by Sony Chemical) was uniformly applied to the recessed portion to a thickness of 0.02 mm, the stamper was placed on top of the stamper, the surface was protected with a PET film, and then pressure was applied to adhere the stamper. Stampers were similarly embedded in the remaining seven recesses to obtain long stampers.

The left end of the long stamper is fixed with a screw from above the stamper fixing jig 7, the right end is fixed with the fixing jig 7 under tension, and the roll stamper is placed in the state shown in Fig. 4. − was created.

Using this roll type stamper, an optical card substrate was created by the roller grooving method.
A substrate was obtained on which the fine irregularities on the substrate were accurately transferred.

Example 3 A nickel stamper with an outer diameter of 100 mm and a thickness of 0.08 mm was prepared in the same manner as in the example, using a stamper pattern for a 3.5-inch optical disk. On the other hand, thickness 0.2
A number was created by cutting and polishing 8 recesses of 100 mm diameter and 0.1 mm depth on a 250 mm x 500 mm nickel sheet.

Apply cyanoacrylate adhesive (5C55 manufactured by Sony Chemical) to this recess to a thickness of 0.02 mm.
The above-mentioned stamper whose pattern was protected with a vinyl resin was placed thereon and bonded under pressure.The stamper was embedded in the remaining recesses in the same manner to obtain a long stamper.

A roll stamper was created in the same manner as in Example 2,
When an optical disk substrate was prepared by the roller grooving method, a substrate with a fine concavo-convex pattern transferred with high accuracy was obtained.

[Effects of the Invention] As is clear from the above explanation, in the method for producing a long stamper of the present invention, a conventional method can be applied to the fine pattern mastering process, so a pattern for a long stamper can be created using a small device. can. In addition, the yield rate is higher than when a large-area stamper is made one time at a time, and the manufacturing cost of the stamper can be reduced.

Further, by using the long stamper of the present invention and fixing it to a roller by a method such as screwing to create a roll stamper, the following effects can also be obtained.

(1) Since predetermined patterns for a plurality of information recording media can be formed on one roll stamper in about 10 minutes, work can be simplified and production efficiency improved at the same time.

(2) The long stamper can be replaced in a very short time, and the roller group forming device does not have to be stopped during that time, so no wasted time occurs.

(3) A roll stamper using a long stamper,
By molding the information recording medium substrate, the manufacturing cost of the information recording medium substrate can be lowered, and an inexpensive information recording medium can be provided.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a schematic diagram illustrating the method for producing the long stamper of Example 1, Fig. 2 is a schematic diagram of the elongated stamper produced in Example 1, and Fig. 3 Fig. 2 is a schematic diagram showing a method of manufacturing a roll stamper by attaching a long stamper to a roller, and Fig. 4 is a schematic diagram showing a state in which a long stamper of Example 2 is attached to a roll. It is a sectional view of the fixing jig. 1... Sheet-like base material of uniform thickness with recesses, 2.
... Stamper 13, 3'3''... Concavity, 4... Adhesive sheet, 5... Long stamper 6... Roller 7... Stamper fixing jig.

Claims (1)

[Scope of Claims] 1. A long stamper used in a roll-type stamper for molding an optical information recording medium, in which a sheet-like base material having a uniform thickness and having at least one recess is provided with a recess formed in the recess. The long stamper is formed by fixing a stamper that fits into the long stamper. 2. The long stamper according to claim 1, wherein the sheet-like base material and the stamper are made of the same material. 3. The elongated stamper according to claim 1, wherein the stamper is fixed by an adhesive member interposed between the recess and the stamper. 4. The long stamper according to claim 3, wherein the adhesive member is a polymer adhesive or a low melting point metal. 5. The method for producing a long stamper according to claim 1, wherein at least one or more recesses are provided in a sheet-like base material having a uniform thickness, and the stamper is fitted into the recess through an adhesive member. A method for producing a long stamper, which comprises attaching a matching stamper and then fixing the stamper to the base material by pressurizing and/or heating the stamper. 6. A roll-type stamper for molding an optical information recording medium, comprising the long stamper according to claim 1 attached to the outer periphery of a roller using a fixing jig.