JPH0336022A - Manufacture of optical disc - Google Patents

Abstract

PURPOSE:To prevent fluctuation in film thickness due to the stepped film thickness from developing by a method wherein the diameter of the roll of a roll stamper is set to be 5 times or more as large as the diameter of the stamper and the surface of the roll and the stamper face are flush with each other and the stamper is fixed by suction under vacuum. CONSTITUTION:The diameter of the roll of a roll stamper part 8 is set to be 5 times or more as large as the diameter of the stamper. For example, the diameter of the roll is 1,000mm and its width is 300mm. The recessed part of a stamper suction holder 81 is provided at two locations. The depth (d) of the recessed part is 0.3mm and its diameter is 130.6mmphi. The recessed part is machined with a milling machine and then ground and polished. Suction holes 84 are provided concyclic in one row on the outer periphery side of the stamper suction holder part and in another row at the middle of the radius of the stamper. The stamper is sucked through exhaust system 85, through which the central part of a roll and the suction holes are connected to each other. Each used stamper 83 is made of Ni and has the diameter of 130mmphi and the thickness of 0.3mm. When the stampers 83 are sucked under vacuum under the state being fitted to the grooves of the stamper suction parts 81, the gap (g) between the stamper 83 and the surface 12 of the roll is turned to be 0.3mm. Ultraviolet-curing agent is poured with the needle of an injector in the gap short of overflowing and cured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an optical disk, and more particularly, to a method for manufacturing a flexible optical disk in which information is recorded and reproduced using laser light.

[Conventional technology]

Traditionally, the production of optical discs requires improved precision, mass production, and
Various efforts have been made to improve performance and reduce costs.For example, (1) UV-curable resin is applied to the base film to improve its leveling and to create a guide between the impression cylinder and plate cylinder. A method for producing a disk (Japanese Unexamined Patent Application Publication No. 56-87203 (see official bulletin).

(2) A radiation-curable resin layer is continuously coated on a flexible long film substrate, and this is continuously exposed to light or electron beam irradiation to dissolve and remove the unexposed and uncured portions, and the organic dye A continuous manufacturing method for an optical recording medium (JP-A-62-71040)
(see publication).

(3) The resin surface of the laser disk-shaped precept film, which has thermoformable ultraviolet curable resin or electron beam curable resin provided on the base film, is used as a laser disk original plate on which irregularities corresponding to electrical signals are formed. A method for manufacturing a laser disk (see Japanese Patent Laid-Open Publication No. 63-1434, No. 1), in which the resin is pressed under heating conditions to form irregularities on the resin, and then irradiated with ultraviolet rays or electron beams, etc. be.

[Problem to be solved by the invention]

However, in method (1), the signal forming surface process by vacuum deposition cannot be continuous with the previous process;
Method 2) is a method of manufacturing a disc with a linear guide track by exposure and development, and method (3) is a method of manufacturing a so-called copy disc of an optical disc containing signals such as audio and images. The original optical disc (sheet-like semi-finished product before die cutting) is produced from the base film using the pressure molding method.
Until then, there was no consistent continuous manufacturing method.

In addition, particularly in the method (1), the stamper can be attached to the plate cylinder by pasting the stamper on the cylinder of the plate cylinder with an adhesive or double-sided adhesive tape, or by screwing both ends of the stamper. The attachment method using adhesive has the problem that when replacing the stamper due to a change in product number, the stamper itself becomes unusable again.
In addition, when attaching with double-sided adhesive tape, when forming guide tracks on the resin by pressure bonding, a large difference in film thickness is generated between the areas where the adhesive tape is present and where the adhesive tape is not present, and large gaps may also occur locally. This causes large film thickness unevenness in the subsequent dye coating process and protective film coating process. In addition, this causes the web itself to become crooked, which has a negative effect on running properties, while the stambar does not last long, begins to peel off from the circumference, and becomes unusable in a short period of time, resulting in problems in terms of quality, yield, and operation. It had many problems. Therefore, it was impossible to consider making the process continuous.

The purpose of the present invention is to solve the above-mentioned conventional problems, and to reduce the cost by eliminating the wear of the stamper when changing the product due to the stamper attachment method in an optical disk manufacturing method in which guide tracks are formed by pressure bonding. We provide a method for manufacturing optical discs that eliminates the occurrence of film thickness unevenness due to film thickness differences in the film, stabilizes the process, and increases yields, and thereby provides a consistent process from the base film to the original optical disc! The purpose is to enable manufacturing.

[Means to solve the problem]

The second object of the present invention is to provide a method for manufacturing an optical disc, which includes a step of forming a guide track by pressing on an ultraviolet curing adhesive on a base film using a roll stamper.
Achieved by an optical disc manufacturing method characterized in that the roll diameter of the roll stamper is at least 5 times the diameter of the stamper, the roll surface and the stamper surface are at the same height, and the stamper is fixed by vacuum suction. be done.

In the present invention, the roll diameter of the roll stamper is specifically preferably 1000 m or more.

In the present invention, making the roll surface and the stamper surface the same height means that the necessary number of stamper insertion recesses are provided on the roll surface with a size that allows for some margin in the size of the stamper and a depth equal to the thickness of the stamper. A UV curing adhesive is sealed in advance in the gap around the stamper insertion recess and the stamper, and cured, and each time the stamper is inserted into the recess, the stamper is flush with the U-ru surface. .

In the present invention, fixing the stamper by vacuum suction means that a large number of suction holes are provided on the outer periphery and the inner part of the concave surface of the roll stamper into which the stamper is inserted, and the exhaust air is passed through the suction holes from the center of the roller. Depending on the system, it refers to the process of sucking and fixing the stamper.

In the method of manufacturing optical discs, continuous production from the base film to the original optical disc means that from the delivery part of the base film, the part coated with ultraviolet curable resin, part of the roll stamper, and the part irradiated with ultraviolet rays. , the process from the optical recording layer coating and drying section to the winding section of the web and backing paper is made continuous, and in this case, a process of laminating a photoresist instead of the ultraviolet curable resin coating section is added. It may be used, and the undercoat layer is applied and dried next to the delivery part of the base film, optical recording 1! ! ! A retaining layer coating/drying section may be inserted next to the cloth/drying section.

In short, it means making the various processes from sending out the base film to winding up the optical disc web consistent and continuous.

To further explain the content of the present invention, any film-like material can be used as the base film in the present invention. Specifically, stretched films of heat-resistant polymers such as polyethylene, polypropylene, polyethylene terephthalate, polyamide, and polyamide are suitable.
．． Polyvinyl chloride, vinyl chloride/vinyl acetate copolymer.

Polymer films such as polyvinylidene chloride, polymethylbolystyrene methacrylate, polyvinyl butyral polycarbonate, paper 1 synthetic paper, metal films such as iron, etc. can also be used.

The thickness is preferably 10 μm to 100 μm.

As the ultraviolet curable resin in the present invention, most of the ordinary negative photoresists can be used, but polyester, polyurethane, epoxy resin, etc. and acrylic acid resin are particularly suitable for adhesion to polymer films and various durability. Those containing ester or methacrylic acid ester as a main component are preferred.

As a method for applying the ultraviolet curable resin onto the base film, gravure offset coating, reverse coating, and wire var coating are used.

The roll stamper used in the present invention uses a large-diameter roll, but the pressure roll uses a small-diameter one and the pressure is 20 k.
g/m, and an ultraviolet irradiation section is used between the pressure roll and the peeling roll.

The organic dye that becomes the optical recording layer used in the production of optical disks may be used alone, or a polymer binder may be added for the purpose of improving film adhesion, controlling recording sensitivity, improving durability, etc. Any such organic dye can be used as long as it has appropriate solubility in an organic solvent, such as cyanine dye, merocyanine dye, 1 naphthoquinone dye, 1 atraquinone dye, triphenylmethane dye, squarylium. Dyes 1 Examples include phthalocyanine dyes, amine dyes, and metal complex dyes.

The preferred coating method for the optical recording layer is gravure offset coating.

[For production]

In the optical disk manufacturing method of the present invention, by increasing the roll diameter of the roll stamper to 1000 mm or more, the flatness of the stamper becomes closer to a flat surface. The molded resin also has less curling, which is preferable.

Also, since the roll surface and stamper surface are at the same height, the pressure force is uniform when molding into resin, and the formed resin surface is also finished uniformly, so that the subsequent optical recording layer and protective film can also be coated. It can be applied uniformly, which is preferable from the standpoint of quality and yield, and it can withstand long-term use without damaging the stamper itself.

Furthermore, by fixing the stamper using vacuum suction,
A uniform flat surface can be obtained without damaging the stamper. Further, even when changing the stamper when changing the product type, the work can be done easily and without damaging the stamper, so that the life of the stamper can be extended.

As described above, due to the improvement in the mounting method of the roll stamper of the present invention, there is no need to worry about the occurrence of film thickness cavities due to differences in film thickness caused by the conventional stamper mounting method.

As mentioned above, the conventional concerns with roll stampers are eliminated and the process is stabilized, so the coating process of the optical recording layer and the coating process of the adhesive RJN are stabilized, the yield is improved, and the optical disc It has become possible to perform continuous manufacturing all the way down to the original fabric, and it has become possible to obtain the effects of continuous manufacturing.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to this embodiment.

Example-■ Fig. 1 is a side view of the roll stamper of the present invention, Fig. 2 is a partial plan view of a part of the stamper adsorption holder of the roll stamper of the present invention, and Fig. 3 is a side view of the roll stamper of the present invention. FIG. 3 is a cross-sectional view of a part of the stamper adsorption holder. 1st, 2nd.
In Fig. 3, the roll diameter of the roll stand bar part 8 is 1000 cm, the width is 300 cm, and the stamper binding holder part 81 has two recesses, the depth of which is d and part 0.3 w.
a. The diameter is 130.6 mφ, and the concave part was ground using a milling machine and polished to 9F. The suction holes 84 are arranged in one row on the outer periphery of a part of the stamper suction holder on the keyaki shown in Fig. 2, and are located in the middle of the stamper diameter! Rows of holes are arranged circumferentially, and the stamper is sucked by an exhaust system 85 that passes through the suction holes from the center of the roller.

The stamper 83 used was 130-φ and 0.3ss thick.
It is made of Ni.

When the stamper 83 is fitted into the groove of the stamper adsorption holder part 81 and vacuum adsorbed, the tamper 83 and the roll surface 82
The gap g=0°3mm.

By injecting an ultraviolet curing agent into this gap to an extent that it does not protrude with a syringe needle and curing it, the surface of the stamper 83 becomes a surface at exactly the same height as the roll surface 82. By doing this, the ultraviolet N applied on the base film
The pressure bonding of the IA curable resin can be performed accurately, and the thickness of the organic dye coating film that is the optical recording layer and the coating film of the protective film can be coated accurately.

Example 2 Next, an example of a continuous Vt manufacturing method that is made possible by using the present invention will be described with reference to the drawings. Figure 4 shows one of the continuous and integrated manufacturing methods using the optical disc manufacturing method of the present invention.
FIG. 3 is a schematic side view of the embodiment.

In Figure 4, a polyethylene terephthalate (PET) film is used as the base film, and its width is 250+
Load a 1000 m roll of as, r ¥ 15 um into the delivery section l, and send it out at 10 = 15 m/+win.
Web tension and web edge position detection control unit 2
Then, it passes through an undercoat section 3 using a rotating coil bar 6 and a diameter of φ wire of 0.06 mm, an undercoat drying section 4, and enters an ultraviolet curable resin application section 5. The ultraviolet curable resin application section 5 is the undercoat section 3
Similarly, using a 6 mm coil bar and a wire diameter of 0.04 mm, the same method was used. Next, the ultraviolet ray lamp 7 in the precure section 6 of the ultraviolet curable resin was used to increase the hardness of the resin through SAH. , roll stand bar part 8
to go into.

The roll stand bar part 8 uses the large diameter roll and mounting method used in Example-2, and the pressure roll 9 is made of a small diameter roll made of silicone rubber.

The ultraviolet curable resin film is firmly pressed onto the stamper with a hardness of 50° and a pressing force of 20 kg/m to form a guide track. The bottom-shaped resin film is cured in the ultraviolet curing section 11 using three ultraviolet light lamps of 12.2 kW, and is peeled off from the roll stand bar part 8 by a peeling roll IO made of the same material as the pressure roll 9.

The resin film formed by pressing the guide track with the stamper is coated with a coating agent containing an organic dye, which is an optical recording agent, in the optical recording layer coating section 13, and is coated with a gravure offset method using 120 mesh gravure. Apply.

Next, the protective film coating section 15. After passing through the protective film drying section 16° and the web tension and edge position detection control section 17, the web is wound up as a raw fabric by the last web and the gold paper winding section 18, sandwiching the nonwoven fabric sent out from the interleaf paper delivery section 19. It will be done.

Using the above manufacturing method, 100 optical discs, 10
As a result of producing 00 sheets and 3000 sheets using continuous integrated manufacturing equipment, in both cases, except for 6 sheets at the time of second generation, which were of non-standard quality, all were within the standard, with good reproducibility and little variation. An optical disc of extremely good quality was obtained.

〔Effect of the invention〕

According to the optical disc manufacturing method of the present invention, (1) by adopting the method of attaching the stamper to a part of the roll standber, it is possible to accurately form the guide track on the ultraviolet curable resin film. The thickness of the optical recording layer and protective film can now be accurately applied, improving the quality of the optical disc and increasing the yield.

(2) It is now easier to replace the stamper when switching types, and the lifespan of the stamper can be extended without damaging it, contributing to cost reduction.

(3) By stabilizing a part of the roll standby process, the subsequent coating and drying processes of the optical recording layer and protective layer were also stabilized, the continuous operation time became longer, and the yield was stabilized, resulting in - Continuous manufacturing is now possible, making mass production and handling of various types easier.

(4) When each process became a continuous system, deer prevention measures became sufficient, and breakdowns due to agricultural dust were reduced, making stable production possible.

(5) Significant reduction in the number of workers due to continuous production equipment;
It is possible to rationalize factory space, reduce equipment costs,
It greatly contributes to reducing product costs.

[Brief explanation of drawings]

Figure 1 is a schematic perspective view of the roll stamper of the present invention, Figure 2 is a schematic perspective view of the roll stamper of the present invention;
The figure is a partial plan view of a part of the suction holder of the roll stamper of the present invention, FIG. 3 is a partial cross-sectional view of a part of the suction holder of the roll stamper of the present invention, and FIG. FIG. 2 is a schematic side view of a continuous manufacturing method using the method. 3 ・ ・ 4 ・ ・ 5 ・ ・ 6 ・ ・ 7 ・ ・ 8 ・ 9 ・ ・ 10 ・ 11 ・ l 2 ・ 13 ・ 14 ・ l 5 ・ 16 ・ 17 ・ 1 B ・ ・Web sending section/web tension and edge position detection control section, undercoat section, undercoat drying section, ultraviolet curing citrus coating section, pre-cure section, ultraviolet lamp, roll stamper part, pressure roll, peeling roll, ultraviolet curing section, ultraviolet curing lamp・・Optical recording layer coating section ・・Dye drying section ・・Protective M coating section ・・Protective film drying section ・・Web tension and edge position detection control section ・・Web and joint winding section 19 ・ 8 l・ 82 ・ 84 ・ ・Interleaf paper delivery section ・Part of stamper suction holder ・O-roll surface 83 ・Stamper ・Suction hole 85 ・Exhaust system (3 others) Funeral map

Claims (1)

[Claims] (1) A method for manufacturing an optical disc, which includes a step of press-forming a guide track on an ultraviolet curable resin on a base film using a roll stamper, wherein the roll diameter of the roll stamper is 5 times or more the diameter of the stamper,
A method for manufacturing an optical disc, characterized in that the roll surface and the stamper surface are made at the same height, and the stamper is fixed by vacuum suction.