JPH0636355A - Production of information recording carrier - Google Patents

Abstract

PURPOSE:To enhance the yield of products and to prevent harmful influence such as an eruption of the skin due to sticking to the human body. CONSTITUTION:A stamper 2 is brought into adhesion to a dry polymer sheet 6 press-bonded to a transparent substrate 4 under heating. By this adhesion, the generation of bubbles due to intruded air is perfectly prevented. Since the dry polymer sheet 6 is solid, sticking to the human body due to scattering is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a high density information record carrier.

[0002]

2. Description of the Related Art Conventionally, signals are transferred onto a transparent substrate such as glass by an injection method or a 2P (photopolymer) transfer method.

FIG. 1 shows an example of a 2P transfer system, in which a liquid 2P is formed on the transfer surface of a disk-shaped stamper 2 made of nickel and having pits (or grooves) 1 transferred thereto.
(UV curable resin) 3 is dropped. When the 2P3 is dropped, a circle is drawn near the center of the stamper 2. After the dropping of 2P3 is completed, the transparent substrate 4 such as a disk-shaped glass is brought into close contact with the transfer surface of the stamper 2. At this time, 2P hung near the center of the stamper 2
3 is pushed out while being spread in the radial direction of the stamper 2 due to the close contact of the transparent substrate 4.

The extra 2P3 is pushed out from between the stamper 2 and the transparent substrate 4. Therefore, by making the contact of the transparent substrate 4 to the transfer surface of the stamper 2 uniform, 2P3 between the stamper 2 and the transparent substrate 4 can be made uniform.

Next, the 2P3 is cured by irradiating it with ultraviolet rays from the transparent substrate 4 side. After the 2P is cured, the stamper 2 is peeled off from the transparent substrate 4 side, so that the 2P transfer layer 3a on which the pits (or grooves) 1 are transferred is formed on the transparent substrate 4.

By the way, a reflective film is formed on the 2P transfer layer 3a by vapor deposition, and a protective film is further formed on the reflective film, whereby an optical disk such as a CD on which one side recording is performed is manufactured. Also, an optical disk such as an LD is manufactured by applying an adhesive on the protective film and bonding the other transparent substrate 4 together.

[0007]

By the way, in such 2P transfer system, since liquid 2P3 is used,
2P by pressing the stamper 2 against the transparent substrate 4
When 3 spreads in the radial direction of the stamper 2, air is entrained, so that bubbles are mixed in the cured 2P transfer layer 3a, resulting in a problem that the yield of products is reduced.

Further, there is a problem that the 2P3 easily adheres to the human body when the 2P3 is dropped on the stamper 2 or the like, causing damage such as a rash.

The present invention has been made in view of such circumstances, and provides a method of manufacturing an information recording carrier capable of improving the yield of products and preventing the adverse effects such as rash due to adhesion to the human body. The purpose is to

[0010]

According to the method for producing an information record carrier of the present invention, a dry polymer sheet is thermocompression-bonded on a transparent substrate, a stamper is brought into close contact with the dry polymer sheet, and the stamper is pressed. After the ultraviolet ray is irradiated to cure the dry polymer sheet, the stamper is peeled off to obtain an information record carrier.

Further, in the method for producing an information recording carrier of the present invention, the dry polymer contains 50 to 20 creep clay.
It is characterized in that it has a 0 M poise and a refractive index substantially equal to that of the transparent substrate.

[0012]

In the method of manufacturing the information recording carrier of the present invention, since the stamper is brought into close contact with the dry polymer sheet thermocompression-bonded on the transparent substrate, air entrapment is different from the conventional liquid ultraviolet curable resin. There is no generation of bubbles. Further, since the dry polymer sheet is solid, there is no need to worry about the dry polymer sheet being attached to the human body due to scattering or the like.

Further, the creep clay of the dry polymer is added to 5
The porosity is set to 0 to 200 M, and the refractive index is substantially the same as that of the transparent substrate. In this case, when the creep clay exceeds 200 M poise, the clay is too high to transfer pits and the like, and when it is below 500,000 poise, the clay is too low and the film thickness of the transfer layer is not constant. By setting the range to, a good transfer layer can be obtained.

When the difference in the refractive index with respect to the transparent substrate becomes large, the light path changes at the joint surface between the transparent substrate and the dry polymer sheet, resulting in loss of light quantity. In the invention, since the refractive index has a value that is substantially the same as that of the transparent substrate, it is possible to suppress the light amount loss of the return light from the recording surface during signal reading.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, the same parts as those in FIG. 1 are designated by the same reference numerals, and overlapping description will be omitted.

FIG. 2 shows an embodiment of the method for manufacturing the information record carrier of the present invention. When manufacturing the information record carrier, first, as shown in FIG.
The dry polymer sheet 6 is thermocompression-bonded on the glass substrate or the transparent substrate 4 made of synthetic resin such as acrylic or polycarbonate.

Here, the dry polymer sheet 6 is SU
RPHEX ™ (manufactured by DuPont) was used. Creep clay is 50-200M poise and the refractive index n is about 1.4.
Those in the range of -16 were used.

The composition of the dry polymer sheet 6 is as follows. Binder resin: 30 to 55% Monomer: 10 to 30% Plasticizer: 1 to 20% Polymerization initiator: 1 to 5% Others: 1 to 10%

Incidentally, other materials include antioxidants, brighteners, ultraviolet absorbers and heat stabilizers.

Next, as shown in FIG. 2B, a stamper 2 made of nickel in which pits for supporting information and / or guide grooves for tracking are formed in a concentric or spiral shape is pressure-bonded onto the dry polymer sheet 6. Let At this time, the pressure applied to the stamper 2 is 25 to 120 Kg / cm.
2 and the pressurizing time was 5 to 15 seconds.

Further, while the stamper 2 is being pressed, ultraviolet rays are irradiated from the transparent substrate 4 side as shown in FIG. At this time, the wavelength of ultraviolet rays is 300 to
400 nm, radiation amount 500-2500 m3 / cm
It was 2.

If the stamper 2 is made of 2P, ultraviolet rays can be emitted from the stamper 2 side. This is because 2P has translucency.

Then, after the dry polymer sheet 6 was cured, the stamper 2 was peeled off from the transparent substrate 4 to obtain a 2P transfer layer 6a having pits and / or guide grooves transferred.

By the way, by forming a reflection film and a protective film on the 2P transfer layer 6a on the thus obtained information recording carrier, a ROM disk such as a CD or LD can be obtained. On the other hand, a writable disc can be obtained by forming an organic dye such as a senior dye or a recording film made of a magnetic film such as TeFeCo on the 2P transfer layer 6a.

As described above, in this embodiment, the stamper 2 is brought into close contact with the dry polymer sheet 6 thermocompression-bonded on the transparent substrate 4, so that air entrapment is different from the conventional liquid ultraviolet curing resin. There is no generation of bubbles. Further, since the dry polymer sheet 6 is solid, there is no fear of being attached to the human body due to scattering or the like as in the conventional case.

Further, the creep clay of the dry polymer 6 is set to 50 to 200 M poise, and the refractive index thereof is made substantially equal to that of the transparent substrate. In this case, creep clay is 200M
If it exceeds poise, the clay is too high and it becomes difficult to transfer pits, etc. If it is below 500,000 poise, the clay is too low and the film thickness of the transfer layer is not constant, but by setting the creep clay within the above range A good transfer layer can be obtained.

Further, when the difference in the refractive index with respect to the transparent substrate 4 becomes large, the light path changes at the joint surface between the transparent substrate 4 and the dry polymer sheet 6,
As a result, a light amount loss is caused, but since the refractive index in this embodiment has a value substantially equal to that of the transparent substrate 4, it is possible to suppress the light amount loss of the return light from the recording surface during signal reading. You can

FIG. 3 shows another embodiment in which a ROM disk such as a CD or LD is manufactured by continuous transfer. The dry polymer sheet 6 and the substrate sheet 4A are roll-shaped in the supply devices 7 and 8. It is wound around.

The dry polymer sheet 6 and the substrate sheet 4A supplied from the supply devices 7 and 8 are heated rolls 9 and 10, respectively.
After being heated and pressure-bonded by, it is sent to the transfer rollers 11 and 12. The stamper 2 is attached to the transfer roller 11 along the curved surface of the roller, and the transfer is performed on the dry polymer sheet 6 by the rotation of the transfer roller 11. At this time, the dry polymer sheet 6 is pressed by the transfer rollers 11 and 12 at the above-mentioned value.

After the transfer is completed, the ultraviolet ray emitting lamp 13 irradiates ultraviolet rays to cure the dry polymer sheet 6. After completing the ultraviolet curing, the sputtering device 14
A reflection film is formed on the dry polymer sheet 6. Further, after forming a protective film on the reflective film, a disk-shaped information recording carrier having a center hole formed by press punching is obtained by the press punching device 15.

As described above, in this embodiment, the dry polymer sheet 6 and the substrate sheet 4A are supplied to the feeding devices 7 and 8.
Since it is wound in a roll shape and is sequentially fed to the transfer rollers 11 and 12, the continuous transfer is performed.
The production amount of optical disks can be improved.

[0032]

As described above, according to the method of manufacturing an information record carrier of the present invention, the dry polymer sheet is thermocompression-bonded on the transparent substrate, and the stamper is brought into close contact with the dry polymer sheet. Unlike conventional liquid UV curable resins, air bubbles are not generated due to air entrapment. Further, since the dry polymer sheet is solid, there is no need to worry about the dry polymer sheet being attached to the human body due to scattering or the like.

Further, dry polymer creep clay was added to 5
The porosity is set to 0 to 200 M, and the refractive index is substantially the same as that of the transparent substrate.

By the way, in creep clay, 20
If it is higher than 0M poise, the clay is too high to transfer pits or the like, and if it is lower than 500,000 poise, the clay is too low and the thickness of the transfer layer is not constant.

When the difference in the refractive index with respect to the transparent substrate becomes large, the path of light changes at the joint surface between the transparent substrate and the dry polymer sheet, resulting in loss of light quantity. Those having approximately the same value are preferable. Therefore, it is possible to improve the yield of products and prevent adverse effects such as a rash caused by adhesion to a human body.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a conventional 2P transfer method.

FIG. 2 is a diagram showing a 2P transfer method of the present invention.

FIG. 3 is a diagram showing a continuous transfer work line according to the 2P transfer method of FIG.

[Explanation of symbols]

 1 Pit (or Groove) 2 Stamper 4 Transparent Substrate 6 Dry Polymer Sheet 6a 2P Transfer Layer

Claims (2)

[Claims] 1. A dry polymer sheet is thermocompression-bonded on a transparent substrate, a stamper is brought into close contact with the dry polymer sheet, and ultraviolet rays are irradiated while the stamper is pressurized to cure the dry polymer sheet, An information recording carrier is obtained by peeling off the stamper. 2. The method for producing an information record carrier according to claim 1, wherein the dry polymer has a creep clay of 50 to 200 M poise and a refractive index substantially equal to that of the transparent substrate. .