JP3493824B2 - Optical disc manufacturing method and manufacturing apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for manufacturing an optical disc in which a disc made of resin is provided with an uneven shape corresponding to recorded information.

[0002]

2. Description of the Related Art Conventionally, in the case of manufacturing an LP record, a resin material heated up to around its melting point is pressed by a stamper so that the shape of the stamper is transferred to the surface of the resin material. So-called compression molding was used, but this had problems in terms of transfer accuracy, mass productivity, and cost. For this reason, conventionally, in the case of manufacturing an optical disc, injection molding has been adopted in which molten resin is injected into a mold including a stamper at a high pressure and then the resin is cured. In this injection molding, the mold is first closed with a weak force, then the mold is tightened with a strong force, the nozzle of the injection device is brought into contact with the mold inlet, and the molten resin material is injected into the mold. , Cure. However, in this injection molding, it is necessary to maintain a high pressure state in order to replenish the resin component that shrinks when curing and to prevent the generation of bubbles. Therefore, there is a problem that the entire device becomes large and expensive.

On the other hand, the so-called 2P method (Photo polymer
rization method) is also available. As shown in FIG. 12, a disc 1 made of resin having good optical characteristics is prepared, and the disc 1 is arranged above the stamper 2 at a predetermined interval. Then, the ultraviolet curable resin 3 is filled in between and the disk 1 is pressed toward the stamper 2.
Subsequently, the ultraviolet curable resin 3 is cured by being irradiated with ultraviolet rays from above the disc 1 and is integrated with the disc 1. Thus, when the disc 1 and the UV curable resin 3 are separated from the stamper 2, the optical disc 4 made of the disc 1 and the UV curable resin 3 is manufactured. Finally, the signal recording surface of the optical disc 4 made of the ultraviolet curable resin 3 is covered with a protective layer (not shown) to complete the optical disc.

[0004]

However, in the optical disc thus constructed by the 2P method, the entire disc 1 is pressed toward the stamper 2 at the same time, or a roll is used to push the disc 1 into the stamper 2. With it pressed against
Since the ultraviolet ray is irradiated after being filled with the ultraviolet curable resin 3, the takt time required for manufacturing the optical disk 4 becomes long, the cost becomes high, and there is a problem in mass productivity. It was

In view of the above points, an object of the present invention is to provide an optical disk manufacturing method and a manufacturing apparatus capable of efficiently mass-producing optical disks at low cost.

[0006]

According to the present invention, the above object is to apply an ultraviolet curable resin onto a rotationally driven stamper, and to place a resin disk on the stamper. , While sandwiching the stamper and the resin disk by a roll along a pressure line extending in the radial direction, irradiating ultraviolet rays on the pressure line, and at the same time, rotationally driving the stamper and the resin disk, This is achieved by the optical disc manufacturing method.

Further, according to the present invention, the above object is to provide a driving means for rotationally driving the stamper, a coating means for coating the surface of the stamper with an ultraviolet curable resin, and a stamper coated with the ultraviolet curable resin. A mounting means for mounting the resin disk on, a pressing means for applying pressure along a pressing line extending in the radial direction of the stamper on which the resin disk is mounted, and a pressing line by the pressing means, This is achieved by an optical disk manufacturing apparatus including an illuminating unit that irradiates ultraviolet rays.

According to the above construction, the stamper on which the ultraviolet curable resin is applied and on which the resin disk is placed is
At the same time as the pressure is applied along the pressure line extending in the radial direction by the pressure means, the ultraviolet ray is irradiated along the pressure line by the illumination means, so that the ultraviolet curable resin is applied by the pressure means. Ultraviolet rays are radiated linearly by the illumination means while being pressed. As a result, the ultraviolet curable resin is transferred in one step to the uneven shape showing the signal formed on the stamper surface by pressing, and is cured by ultraviolet irradiation to be integrated with the resin disk. Thus, the optical disc is manufactured.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS.
Since the embodiments described below are preferred specific examples of the present invention, various technically preferable limitations are attached, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these modes.

FIG. 1 shows an embodiment of an optical disk manufacturing apparatus according to the present invention. In FIG. 1, an optical disk manufacturing apparatus 10 includes a frame 11, a driving means 12 provided in the frame 11, a coating means 13, a pressure means 14 provided on the frame 11, and a mounting means 15. There is.

The frame 11 serves as a fixedly arranged apparatus base, and has a hollow box shape inside. As shown in FIG. 4, the driving means 12 includes a motor 12 a fixed to the lower side of the upper surface of the frame 11 and a motor 1 protruding upward from the upper surface of the frame 11.
Turntable 1 mounted on rotating shaft 12b of 2a
2c and the turntable 12c is
The upper surface is formed in a flat disk shape so as to support and rotate the disk-shaped stamper 16 shown in FIG.

In the illustrated case, the application means 13 is for applying an ultraviolet curable resin, which will be described later, to the surface of the stamper 16 placed on the turntable 12c of the drive means 12, and in the illustrated case. A nozzle 13a to which an ultraviolet curable resin is supplied from a supply source (not shown), and a scraping spatula 1 whose lower surface is horizontally formed to remove excess ultraviolet curable resin 17 applied to the surface of the stamper 16
3b and. The nozzle 13a is swingably supported with respect to the frame 11 so as to be movable in a direction parallel to the surface of the stamper 16 as shown by an arrow.

The pressing means 14 is the turntable 12
The pressure is applied downward to c along a pressure line extending in the radial direction from the center of rotation, and the stamper 16 can be contacted from below with respect to this pressure line. For this reason, the support roller 14a fixed on the frame 11 so that the rotation axis is horizontal, the pressing roller 14b disposed at a position facing the support roller 14a from above, and the pressing roller 14b. A roller arm 14c that swingably supports the roller arm from the illustrated position to an upper retracted position, and a bearing 14d that swingably supports the roller arm 14c around a horizontal axis.

Specifically, the roller arm 14c is shown in FIG.
As shown in, the free end side is bent in the middle of information, and the tip side is formed in an angle shape that extends horizontally. The pressing roller 14 is provided on the lower end of the roller arm 14c on the tip side.
b and proof means 14g are provided. Here, the pressing roller 14b is connected to the free end of the roller arm 14c via an air cylinder 14e as shown in FIG.
Alternatively, as shown in FIG. 3, it is attached via a coil spring 14f so as to be movable in the vertical direction and pressed downward.

Further, the pressing means 14 has a portion of the roller arm 14c that supports the pressing roller 14b.
As shown in FIG. 2 or 3, an ultraviolet laser light source 14g as an illuminating unit is provided above the pressing roller 14b. The ultraviolet laser light source 14g is configured to emit an ultraviolet beam, and the pressing roller 14b.
In order to irradiate the ultraviolet rays in a line shape along the pressing line by the slit 14, as shown in FIGS.
By narrowing down by h, or by scanning the ultraviolet beam in the direction of the arrow X as shown in FIG. 8 or by passing the ultraviolet beam through the cylindrical lens 14i, it is focused on the pressure line.

As a result, as shown in FIGS.
The pressing roller 14b presses against the stamper 16 and the resin disk 18, which rotate together with the turntable 12c, from above with a constant pressure along a pressing line extending in the radial direction. At this time, below the turntable 12c, the support roller 14a is in contact with the support roller 14a along the pressure line, so that the stamper 16 and the resin disk 18 coated with the ultraviolet curable resin 17 are not in contact with the support roller 14a. Pressing roller 14
It will be sandwiched and pressed by b. At the same time of this pressurization, the ultraviolet laser light source 14g operates at the same time,
Ultraviolet rays will be irradiated along the pressure line.

The placing means 15 is composed of a disk chuck provided on the lower surface near the middle of the roller arm 14c of the pressing means 14, and together with the pressing roller 14b by swinging of the roller arm 14c. The resin disc 18 held by the disc chuck is placed on the surface of the stamper 16 coated with the ultraviolet curable resin 17.

The optical disk manufacturing apparatus 10 is configured as described above, and an optical disk is manufactured according to the process diagram of FIG. First, in step a, the stamper 16
Is a so-called father stamper having a pit portion 16a which becomes a signal of an optical disc such as a compact disc (CD) in a convex shape on the surface thereof, and is coated with a resist on a glass plate to form a He-Cd laser or It is manufactured by recording a signal with an equivalent laser or the like and performing development plating. Then, in step b, the stamper 16 is subjected to a peeling-accelerating process, for example, by coating the surface having the pits 16a with a peeling-promoting agent 16b.

Next, in step c, the stamper 16 is
The stamper 16 is placed on the turntable 12c of the drive means 12 of the optical disc manufacturing apparatus 10 and the motor 12a is driven to rotate, whereby the stamper 16 rotates together with the turntable 12c. Then, as shown in FIG. 10, the nozzle 13a of the coating means 13 is attached to the surface of the rotating stamper 16.
Thus, the liquid ultraviolet curable resin 17 is dropped. As a result, the ultraviolet curable resin 17 is uniformly applied over the entire surface of the stamper 16 by the rotation of the stamper 16, and so-called spin coating is performed. in this case,
The extra ultraviolet curable resin 17 is removed by the spatula 13b.

Then, in step d, the roller arm 14c
As the disk swings, the resin disk 18 gripped by the disk chuck 15, which is a mounting means, moves to the stamper 16
Placed on top. At this time, at the same time, the pressing roller 14b
Also, the stamper 16 and the resin disk 18 are moved to the vicinity of the surface of the stamper 16, and the stamper 16 and the resin disk 18 are sandwiched and pressed between the support roller 14a and the pressing line extending in the radial direction.

Further, in step e, the stamper 16 and the resin disk 18 rotate along with the turntable 12c, and along the pressing line, the supporting roller 14a and the pressing roller 1 are moved.
It is pressurized by 4b. At this time, at the same time, a linear ultraviolet ray is emitted from the ultraviolet laser light source 14g along the pressing line. Thereby, the ultraviolet curable resin 17
The shape of the pit portion 16a on the surface of the stamper 16 is transferred, and is integrated with the resin disk 18 by fixing to be cured. Thus, the shape of the entire surface of the stamper 16, that is, the pit portion 16a around the entire circumference of the stamper 16 is transferred to the ultraviolet curable resin 17 by one or more revolutions of the turntable 12c.

Then, in step f, the roller arm 14c
By swinging, the pressing roller 14c and the mounting means 15 retract upward, and the resin disc 18 and the ultraviolet curable resin 17 integrated as described above are separated from the stamper 16.

Here, the resin disk 18 and the ultraviolet curable resin 17 are removed from the mounting means 15 of the optical disk manufacturing apparatus 10, and in step g, the surface of the ultraviolet curable resin 17 side is read by sputtering. The reflective film 19 is formed, and in step h, the protective film 20 is formed.
Thus, the optical disk 21 is completed.

In the above-described embodiment, the UV curable resin 17 is applied by the nozzle 13a of the applying means 13.
Spin coating is performed on the surface of the rotating stamper 16, but the present invention is not limited to this.
Obviously, for example, a spatula or the like may be used as long as the ultraviolet curable resin can be uniformly applied to the surface of the.

[0025]

As described above, according to the present invention, the ultraviolet curable resin is transferred with the uneven shape corresponding to the recording signal formed on the stamper surface by the pressure in one step. , Cured by ultraviolet irradiation and integrated with the resin disk. Therefore, the pressurization of the ultraviolet curable resin and the irradiation of the ultraviolet rays are simultaneously performed, so that the number of steps is reduced, so that the tact time required for manufacturing the optical disc is shortened and the cost is reduced.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of an optical disk manufacturing apparatus to which the present invention is applied.

FIG. 2 is a front view showing a first configuration example of a pressing unit in the optical disc manufacturing apparatus of FIG.

3 is a front view showing a second configuration example of a pressing means in the optical disc manufacturing apparatus of FIG.

4 is a schematic cross-sectional view of a turntable in the optical disc manufacturing apparatus of FIG.

5 is a plan view of relevant parts showing a pressed state in the optical disk manufacturing apparatus of FIG. 1. FIG.

6 is a side view of essential parts showing a pressure state in the optical disk manufacturing apparatus of FIG.

7 is a perspective view of a main part showing a pressed state in the optical disk manufacturing apparatus of FIG.

8 is a schematic perspective view showing a first configuration example of a lighting unit in the optical disc manufacturing apparatus of FIG.

9 is a schematic perspective view showing a second configuration example of the illumination means in the optical disc manufacturing apparatus of FIG.

10 is a schematic perspective view showing a coating state of an ultraviolet curable resin in the optical disc manufacturing apparatus of FIG.

11 is a process chart sequentially showing each process of optical disc manufacturing in the optical disc manufacturing apparatus of FIG.

FIG. 12 is a process diagram sequentially showing a manufacturing process of an optical disc by a conventional 2P method.

[Explanation of symbols]

10 Optical disc manufacturing equipment 11 frames 12 Drive means 12a motor 12b rotating shaft 12c turntable 13 Application means 13a nozzle 13b spatula 14 Pressurizing means 14a Support roller 14b Pressing roller 14c roller arm 14d bearing 14e Air cylinder 14f coil spring 14g UV laser light source 14h slit 14i Cylindrical lens 15 Mounting means (disk chuck) 16 Stamper 16a Pit part 16b Peeling accelerator 17 UV curable resin 18 resin disk 19 Reflective film 20 Protective film 21 optical disc

Claims (8)

(57) [Claims] 1. A step of applying an ultraviolet curable resin on a rotationally driven stamper, a step of placing a resin disk on the stamper, and a pressing wire extending the stamper and the resin disk in a radial direction. A method of irradiating ultraviolet rays onto the pressure line while sandwiching the pressure line with the roller while simultaneously driving the stamper and the resin disk to rotate. 2. The method of manufacturing an optical disk according to claim 1, wherein the ultraviolet curable resin is applied by spin coating. 3. The method of manufacturing an optical disc according to claim 1, wherein the line-shaped ultraviolet irradiation is performed by scanning an ultraviolet beam. 4. The line-shaped ultraviolet ray irradiation is performed through a cylindrical lens.
A method for manufacturing an optical disc according to. 5. A driving means for rotating the stamper, a coating means for coating the surface of the stamper with an ultraviolet curable resin, and a mounting for mounting a resin disk on the stamper coated with the ultraviolet curable resin. Means, a pressurizing means for applying pressure along a pressurizing line extending in the radial direction of the stamper on which the resin disk is placed, and an illuminating means for irradiating ultraviolet rays on the pressurizing line by the pressurizing means. An optical disk manufacturing apparatus characterized by the above. 6. The optical disk manufacturing apparatus according to claim 5, wherein the coating means includes a nozzle for performing spin coating. 7. The optical disk manufacturing apparatus according to claim 5, wherein the illuminating means includes an ultraviolet beam scanning means for performing linear ultraviolet irradiation. 8. The optical disk manufacturing apparatus according to claim 5, wherein the illuminating means is provided with a cylindrical lens for irradiating linear ultraviolet rays.