JPS6047251A - How to make optical disks - Google Patents

Abstract

PURPOSE:To attain the use of a replica base even with wrong ultraviolet ray transmittance by forming a stamper metallic mold to a flat form and irradiating an ultraviolet ray from the stamper side in forming the replica through the use of the flat stamper. CONSTITUTION:A photoresist 2 is coated on a thick glass substrate 1, a desired signal is recorded by using laser light to form a master disk 3. A metal 4 such as A or Ni is adhered to the master disk, then an ultraviolet curing resin (UV resin) 5-1 is coated and a substrate 6 made of a transparent acrylic plate is pressed, then an ultraviolet ray is irradiated to cure the UV resin 5-1. In exfoliating the UV resin 5-1 from the metallic layer 4 finally, the pattern of the master disk is copied to the base side. Then a material 8 such as cellulose acetate is coated to the stamper to form the exfoliated boundary layer. After the UV resin 5-2 is coated on the layer, the preceding substrate and the stamper are pressed together to cure the UV resin. A replica base with wrong ultraviolet ray transmittance is used by irradiating the ultraviolet ray 11 from the stamper side in this case.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for manufacturing an optical disk, and particularly to a method for manufacturing a press mold thereof that can provide a high-performance method.

Here, an optical disk is one in which desired signals are recorded on a recording film on a disk-shaped substrate such as glass using a laser beam. Possible applications include video disks, PCM disks, document seven-isle digital disks, and holographic disks.

[Background of the invention]

Conventionally, a disk has been manufactured by manufacturing a replica from a recorded glass master disc with a 7-oto-reshift on the basis of a stand bar mold manufactured by plating technology. However, since the stanbar mold made by plating has poor flatness, replicas made from this have uneven thickness and large vertical vibrations when rotated. Furthermore, when a replica is manufactured, "bubbles" are likely to be generated on the surface of the replica, resulting in signal loss and dropout of the reproduced signal, which is one of the causes of performance deterioration of the replica.

[Purpose of the invention]

In order to eliminate such drawbacks, the present invention provides a method for making a flat standby mold during disk duplication, and furthermore, when making a replica using this flat standby, ultraviolet rays are irradiated from the standby side. It is desirable to be able to use even a material with poor ultraviolet transmittance as a replica substrate.

[Summary of Hatsumoe]

The present invention is characterized in that a resin stamper is produced using an ultraviolet curing resin, and a replica with a base film is produced using this stamper.

[Embodiments of the invention]

A method for manufacturing a stamper according to the present invention is shown in FIG. First, a photoresist 2 is applied on a thick glass substrate 1,
A desired signal is recorded on this with a laser beam, and it is developed to produce a glass master disk 3 with an uneven surface. On this glass master,
To prevent surface swelling and deterioration, and to ensure peeling.
Attach a metal 4 such as T, Ni, etc., and apply a stripping agent (
For example, silicone oil, chalcogenide, i.e. Te
8e, a mixture or compound containing at least one of 8) is coated by a method such as vapor deposition.

Furthermore, ultraviolet curing resin (hereinafter referred to as UV resin) 5-
After applying UV resin 5-1 and pressing a substrate 6 such as a transparent acrylic plate or glass plate, UV resin 5-
1 is cured. Finally, a metal layer 4 such as At and UV resin 5
By peeling off from the boundary of −1, the butter of the master can be transferred to the substrate side. However, since the unevenness is reversed,
Master or stamper in the recording process
It can be used as 9. If the release agent or metal such as At is removed at the same time, it is possible to reapply it to the entire surface of the glass master 3 and then repeat the same process to create a master or stamper again. In this way, the stamper described above can be made by using the glass master 3 many times until the uneven pattern is broken.

If the photoresist layer has migrated to the stamper side, it is necessary to remove it from above the stamper using a solvent or alkali. After that, it is necessary to remove everything other than the UV resin 5-1 substrate 6.

Next, FIG. 3 shows a process of manufacturing the V-printed crab 0 shown in FIG. 2 using the stamper manufactured as described above.

A material 8, such as cellulose acetate or nitrocellulose, is applied to the if stamper to form the boundary layer of the foil. Next, after applying an ultraviolet curable resin 5-2 (UV resin) on top of that or on the substrate 7 that will become the replica substrate, the previous substrate and stamper are pressed together to cure the UV resin 5-2. .

At this time, ultraviolet light 11 is irradiated from the stamper side.

By doing so, it is possible to use a replica substrate having poor ultraviolet transmittance. For example, an At board can be used. [After JV Fresin hardens, remove it from the stamper and a replica is created.

Then, depending on the purpose, attach a recording film or a reflective film on top of it and use it.

〔Effect of the invention〕

As explained above, according to the present invention, a stamper with good flatness can be easily and quickly produced without including a plating process.Furthermore, FIG. FIG. 2 is a diagram showing the configuration of an optical disk replica for explanation, FIG. 3 is a diagram showing the configuration of an optical disk replica, and FIG.
The figure shows a configuration for making a replica from the stamper.

Claims (1)

[Claims] 1. A step of making a stand bar made of a translucent member and a photocurable resin, a step of applying a comb agent on the curable resin, a step of further applying a photocurable resin thereon, and a replica. a step of pressing the substrate against the photocurable resin; a step of irradiating the substrate with light from the stamper side to cure the resin;
A method for manufacturing an optical disc, which includes the step of combining a cured resin and a substrate and peeling them off from a stand bar.