JPH04263138A - High speed duplicating method of optical disk - Google Patents

Abstract

PURPOSE:To manufacture a large amount of disk at a low cost by previously manufacturing optical disk substrate material, reflection film or recording film, thereafter forming pit expressing tracking pattern and address, etc., and sector mark and then forming a disk continuously. CONSTITUTION:A substrate roll 1 consisting of transparent plastic which becomes a base 7 and a recording film roll 2 consisting of phase varying recording film or reflection film are produced previously. An optical disk substrate having patterns at the surface thereof is formed by theremally pressing the surface of the base supplied from the roll 1 with a roller 4 providing the stamper having the protruding and recessed patterns. Next, the recording film 8 and base 7 supplied from the roll 2 are bonded, with a clamp roller 3, to the optical disk substrate having such pattern with a bonding agent. Subsequently, an optical disk 6 is formed by punching process with a punching machine 5. Thereby a large amount of optical disk can be duplicated at a lower cost.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention applies to CD, CD-I, DVI
, LD, CD-ROM, W/O, reversible recording film, and other optical disk devices, and particularly relates to a method for quickly manufacturing large quantities of inexpensive products. .

0002

[Prior Art] The conventional optical disc duplication method uses a nickel stamper, drops ultraviolet curing resin (UV curing resin) onto it, overlays a transparent glass or plastic plate that will serve as the substrate of the optical disc, and irradiates it with ultraviolet light. After this resin is cured, the substrate and stamper are separated (peeled off) to complete a substrate having an uneven pattern on its surface. This method is the so-called 2P method, and has the advantage of being able to duplicate optical discs with a simple device configuration.

[0003] Another method is called injection. This is done by placing a nickel stamper on one side of a circular mold with the pattern side facing inside, pouring the plastic that has been heated to a high temperature into fluidity into the mold, and then taking out the cooled and hardened substrate. An optical disc substrate is obtained. Compact discs, which are now widely used as an alternative to records, are manufactured using this method using polycarbonate material. On the thus completed optical disk substrate, an aluminum reflective film is formed for only playback of CDs, LDs, etc., a magnetic film is formed for magneto-optical disks, and a suitable film is formed for phase change disks by methods such as vapor deposition or sputtering. do,
It was completed as a single optical disc.

0004

[Problems to be Solved by the Invention] The above-mentioned conventional technology does not take into consideration the need to reproduce a large number of optical discs at high speed, and when producing a large number of optical discs such as CD-ROMs in the millions of discs, it is difficult to copy a large number of optical discs at high speed. It was a time consuming problem. If we were to actually try to achieve this using conventional technology, it would take about 15 seconds for each copy even if it was copied at maximum speed.
It would take about 10 days to supply one million discs, which was said to be impossible with conventional technology considering the supply of optical discs on a weekly basis. This was a problem when entering the publishing market, a new application field that takes advantage of the characteristics of optical discs as high-density, large-capacity recording media.

An object of the present invention is to provide a method for manufacturing a large number of copies of several million optical discs within 10 hours. To improve the time efficiency of disc manufacturing by forming a reflective film or a recording film on an optical disc almost simultaneously with patterning of pits, sector marks, or one of these representing tracking guide grooves and addresses, etc. It is in.

[0006]

[Means for Solving the Problems] In order to achieve the above object, an optical disk substrate material and a reflective film or a recording film are prepared in advance in a roll shape, and then pits and sectors representing tracking guide grooves and addresses are formed. Formation of the mark or one of these patterns and the process of forming the substrate into a disk shape are performed continuously.

[0007]

[Function] In the optical disc manufacturing process, the formation of a reflective film or a recording film is mainly performed in a vacuum, which is a time-consuming process. Therefore, the time required to complete an optical disc can be shortened by laminating a pre-prepared recording film after forming patterns such as guide grooves. Furthermore, by continuously forming tracking patterns,
Replicas can be produced at high speed, from several copies to several dozen copies per second.

[0008]

[Embodiment] An embodiment of the present invention will be explained below with reference to FIG.

Before starting the duplication process, a substrate roll 1 and a recording film roll 2, which will serve as the base of the optical disc, are prepared in advance. The substrate roll 1 was made of transparent plastic such as PET (polyethylene terephthalate) or PC (polycarbonate). The recording film may be any type of recording film, such as a phase-change recording film mainly composed of chalcogenide, a magneto-optical recording film typified by terbium-iron-cobalt, or a dye-applied recording film.A phase-change recording film was used here as an example. Alternatively, a reflective film made of aluminum, aluminum alloy, etc. may be used instead of the recording film. Here, a general phase change recording film was previously formed on a roll-shaped base 7 (FIG. 2). As the base material, plastic such as PET or metal foil can be used.

[0010] This is made by laminating an information recording film constituent material 8 such as a reflective film, a recording film, or a protective film on a long base 7. This can be done continuously, for example, similar to the production of music tapes and image tapes, and moreover, it can be produced in advance off-line. A roller 4 having a stamper having an uneven pattern on the surface of the substrate sheet pulled out from the substrate roll 1
By applying heat and pressure bonding, an optical disk substrate having a pattern on the surface is formed. The heating temperature at this time needs to be raised to about the softening point temperature of the substrate material. Further, it is possible to preheat the pressure roller in the previous stage.

Thereafter, the recording film 8 and the base 7 pulled out from the recording film roll are adhered to the patterned sheet-like substrate using an adhesive (not shown) using a pressing roller 3. In this way, a sheet of an optical disk with a concavo-convex pattern having a recording film is completed. Thereafter, the optical disc is cut into a disc shape to complete the optical disc product, but it is also possible to form a protective film for the optical disc if necessary.

When cutting out a disk, it is necessary to align the center hole with the center of the pattern as much as possible. An example of this method is described below. The objective can be achieved by irradiating the entire surface of a nearly concentric guide groove pattern, using the property that the diffracted light converges at the center of the circle to determine the pattern center, and performing circular processing based on this. can. It took less than 1 second. Figure 3 shows the cross-sectional structure of the optical disc completed in this way.
Shown below.

A recording film 8 is adhered onto the patterned substrate 1 with an adhesive 9. Here, in order to obtain a signal from the pattern, it is necessary to make the refractive index of the material used for the adhesive 9 different from that of the substrate 1. In addition, in order to extract tracking signals from the pattern, the thickness of the adhesive layer should be as thin as possible, preferably 5 μm.
The following is good.

[0014] A pattern forming method other than the above-described embodiment can also be performed using the ultraviolet curing resin 10. In that case, resin 1 is placed between the substrate 1 and the stamper.
0 is poured into the resin, the resin is exposed to light while pressing a stamper to harden the resin, and a concavo-convex pattern is formed on the substrate 1 by the 2P method. The stamper at this time is preferably transparent, and a transparent stamper made of plastic or the like, which is different from nickel, is used, and ultraviolet light is irradiated through the roller to harden the resin 10. The recording film described above may be formed thereon. Alternatively, the resin 10 may be cured by exposure through the substrate 1. FIG. 4 shows a cross section of the optical disc manufactured in this manner.

Another embodiment will be explained with reference to FIG.

In this case as well, the substrate roll 1 and the recording film roll 2 are prepared in advance as in the first embodiment. When forming a pattern,
Pattern forming machine 5 that keeps the heated stamper flat
-1 was pressed against the substrate 1 to transfer a pattern onto the surface thereof. Thereafter, the recording film 8 and the base 7 pulled out from the recording film roll 2 are adhered to the previous patterned sheet-like substrate using an adhesive 9 (not shown in this figure) using a pressing roller 3. In this way, a sheet of an optical disk with a concavo-convex pattern having a recording film is completed. Thereafter, the optical disc is cut into a disk shape to complete the final product of the optical disc.

In the embodiments described above, a recording film is disposed on the optical disc, but a reflective film made of aluminum or the like may also be used. It is also possible to supplement the mechanical strength by bonding a thick plate of 1 mm or more to the fabricated substrate to make an optical disk that can withstand high-speed rotation.

According to the present invention, since the formation of the guide groove and the formation of the recording film necessary for the optical disk can be performed almost simultaneously, it is effective in supplying optical disks quickly, in large quantities, and at low cost.

[0019]

Since the present invention is constructed as described above, it has the advantage of being able to copy optical discs at a higher speed and in greater quantities than in the past. As a result, it becomes possible to supply inexpensive optical discs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a high-speed optical disc duplication process of the present invention.

FIG. 2 is a cross-sectional view showing the recording film structure used in the first example.

FIG. 3 is a cross-sectional view of an optical disc manufactured in the first example.

FIG. 4 is a cross-sectional view of an optical disk patterned with ultraviolet curing resin.

FIG. 5 is a sectional view showing a high-speed optical disc duplication process according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Substrate roll, 2... Recording film roll, 3... Holder roller, 4... Roller with stamper, 5... Punching machine, 5-1...
Pattern forming machine, 6... Completed optical disk disc, 7... Base, 8... Information recording film constituent material or reflective film, 9... Adhesive, 10... Ultraviolet curing resin.

Claims (10)

[Claims] Claim 1: A step of forming pits and/or sector marks representing optical head guide grooves and addresses, etc. on the surface of a substrate for a sheet-like optical disk, and a reflective film or a recording film deposited on the sheet. A method for high-speed reproduction of optical discs, characterized by successively performing a process of laminating a substrate and a process of punching out a disk from a substrate onto which a pattern has been transferred. 2. The method for high-speed duplication of an optical disc according to claim 1, wherein a pre-prepared optical disc substrate and a sheet provided with a reflective film or a recording film are formed in the form of a roll. Fast replication method. 3. A high-speed copying method for an optical disc according to claim 1, characterized in that a stamper having a surface with an uneven pattern is wound around a roller as a matrix for transferring a pattern. Replication method. 4. The method for high-speed duplication of an optical disk according to claim 1, characterized in that a phase change recording film, a magneto-optical recording film, or a recording film using dye is used as the recording film. 5. The method for high-speed duplication of an optical disk according to claim 1, characterized in that gold, aluminum, or an aluminum alloy is used as the reflective film. 6. The method for high-speed duplication of an optical disk according to claim 3, characterized in that a stamper manufactured from a photoresist-covered master by nickel plating is used as the stamper. 7. In the method for high-speed duplication of optical disks according to claim 1, the step of forming pits and/or sector marks representing optical head guide grooves and addresses, etc. on the surface of a sheet-like optical disk substrate includes flattening. A method for high-speed duplication of optical discs, characterized in that a pattern is transferred using a stamper supported by a stamper. 8. The method for high-speed duplication of an optical disk according to claim 7, wherein the optical disk substrate and the recording film are formed in the form of a roll. 9. The method for high-speed duplication of an optical disk according to claim 7, characterized in that a phase change recording film, a magneto-optical recording film, or a recording film using dye is used as the recording film. 10. The method for high-speed duplication of an optical disk according to claim 7, characterized in that aluminum or an aluminum alloy is used as the reflective film.