JPH0737280A - Apparatus and process for production of optical disk - Google Patents

Abstract

PURPOSE:To surely peel a UV curing resin and a transparent plate by providing the apparatus with the transparent plate disposed between the signal surface of a stamper held by a stamper holding part and a means for ejecting up the transparent plate at the time of peeling the resin and the transparent plate. CONSTITUTION:The UV curing resin 23 is packed into the spacing between the stamper 11 and the transparent plate 22 and is irradiated with UV rays, by which the resin 23 is cured. An air cylinder is then actuated and guide pins 14 and ejector pins 15 are moved upward from the surface of a stage. Consequently, projecting line parts 14a disposed at the bottom edges in the outer peripheral parts of the pins 14 and the top ends of the pins 15 pushe upward the transparent plate 22 and the inner peripheral parts of the resin 23 joined to the rear surface thereof. The transparent plate 22 and the resin 23 are thus peeled from the surface of the stamper 11 and the optical disk consisting of the transparent plate 22 and the resin 23 is completed. The destruction of the transparent plate by ejection at the time of peeling from the stamper does not arise even if the transparent plate having about 30cm diameter is used by using this method.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an optical disc for photo po.
The present invention relates to an improvement in an optical disc manufacturing apparatus and method for duplicating and manufacturing by a lymarization method (hereinafter referred to as 2P method).

[0002]

2. Description of the Related Art Conventionally, when an optical disk is manufactured, for example, a photopolymer method using an ultraviolet curable resin, so-called 2
The P method is known.

According to this 2P method, a liquid ultraviolet curable resin is applied to one side of a transparent board by screen printing or the like, and the transparent board is placed on the stamper so that the ultraviolet curable resin adheres to the stamper. Place on. Then, after pressing this transparent plate against the stamper with a roller,
Ultraviolet rays are irradiated from the resin side to cure the ultraviolet curable resin, and the transparent plate is peeled off from the stamper together with the ultraviolet curable resin. As a result, the pattern of fine irregularities (grooves, pits, etc.) formed on the stamper surface is transferred to the ultraviolet curable resin on the transparent plate.

According to such a 2P method, since a liquid resin is used to copy the concave-convex pattern of the stamper, the reproduction fidelity is excellent and the stamper hardly deteriorates. In particular, when a glass plate is used as the transparent plate, there is an advantage that an optical disc excellent in dimensional stability, heat resistance, low birefringence and the like can be manufactured.

When manufacturing an optical disk by the 2P method described above, an optical disk manufacturing apparatus as shown in FIGS. 5 and 6 is used. 6 is a partially enlarged view of FIG.
In these figures, the optical disk manufacturing apparatus 1 includes a mounting table 3 for fixedly holding a stamper 2 having a fine concave-convex pattern formed on the surface thereof, and a mounting table 3 at the center of the mounting table 3 for the mounting table 3. It has a stamper inner diameter holding member 4 and a guide pin 5 which are supported so as to be vertically movable.

The stamper 2 is mounted on the upper surface of the mounting table 3. In this state, the periphery of the hole 2a provided at the center of the stamper 2 is fixed and held to the upper surface of the mounting table 3 by the flange portion 4a of the stamper inner diameter pressing member 4. ing.

When manufacturing an optical disk in the optical disk manufacturing apparatus 1 having such a structure, the transparent plate 6 is first mounted on the surface of the stamper 2 so as to have a slight gap. Here, the transparent plate 6 is positioned on the mounting table 3 by fitting the hole 6a provided at the center thereof into the outer peripheral portion of the guide pin 5. In this case, since the protrusion 5a is provided on the lower edge of the outer peripheral portion of the guide pin 5, the transparent plate 6 has a predetermined gap with respect to the surface of the mounting table 3, Retained.

From this state, the UV curable resin 7 is filled in the gap between the stamper 2 and the transparent plate 6 by means not shown. Subsequently, the ultraviolet curable resin 7 is cured by irradiating it with ultraviolet rays from the transparent plate 6 side. At this time, the ultraviolet curable resin 7 is bonded to the lower surface of the transparent board 6. Thus, an optical disk is obtained in which the ultraviolet curable resin 7 to which the concave / convex pattern of the stamper 2 is transferred is joined to the lower surface of the transparent plate 6.

Finally, a means (not shown) is the guide pin 5.
The guide pin 5 is moved upward from the surface of the mounting table 3 by pushing upward. As a result, the protruding portion 5a provided on the lower edge of the outer peripheral portion of the guide pin 5 causes the transparent plate 6 and the ultraviolet curable resin 7 bonded to the lower surface thereof to
Push it upwards, this transparent plate 6 and UV curable resin 7
Will be peeled off from the surface of the stamper 2. Thus, an optical disk composed of the transparent board 6 and the ultraviolet curable resin 7 is completed.

[0010]

In the optical disk manufacturing apparatus 1 having such a structure, the transparent plate 6 and the ultraviolet curable resin 7 bonded to the lower surface thereof are separated from the stamper 2 by the upward movement of the guide pin 5. , Done. That is, due to the upward movement of the guide pin 5, the guide pin 5
The protrusion 5a at the lower edge of the outer peripheral portion pushes up the inner edges of the transparent plate 6 and the ultraviolet curable resin 7.

Therefore, the transparent plate 6 has a diameter of 30c, for example.
When the guide pin 5 is made of a brittle material such as glass having a diameter of about m, the protrusion 5a is moved by the upward movement of the guide pin 5.
Pushes up the inner peripheral edges of the transparent plate 6 and the ultraviolet curable resin 7. At this time, the protruding portion 5a is lifted against the weight of the transparent board 6 and the ultraviolet curable resin 7 and the joining force to the stamper 2. Therefore, in some cases, the inner peripheral edge of the transparent plate 6 with which the protrusion 5a of the guide pin 5 abuts may be destroyed.

In view of the above points, the present invention provides an optical disk manufacturing method and method, in which an optical disk made of a UV curable resin bonded to a transparent board and its lower surface is surely separated from a stamper. Has an aim.

[0013]

According to the present invention, the above object is to provide a gap between a stamper holding portion, which is a master of an optical disc, and a signal surface of the stamper held by the stamper holding portion. An optical disk manufacturing apparatus, which is provided with a means for pushing up the transparent plate when the transparent plate provided, the ultraviolet curable resin that is filled in the gap and cured and the transparent plate are separated from the stamper, To be achieved.

In the optical disk manufacturing apparatus according to the present invention, preferably, the means for pushing up the transparent plate is composed of at least three pins for pushing up the inner peripheral portion of the transparent plate.

Further, preferably, the pin is configured to be vertically moved in synchronization by a driving mechanism such as an air cylinder or a rack and pinion mechanism.

Further, according to the present invention, the above object is to provide a transparent plate with a slight gap to the signal surface of the stamper, which is the master plate of the optical disk, and to combine the stamper and the transparent plate. When the ultraviolet curable resin is filled in between and cured by ultraviolet irradiation, the transparent disc is joined with the ultraviolet curable resin to which the unevenness of the signal surface of the stamper is transferred, and then the transparent disc is peeled from the stamper. The optical disk manufacturing method is characterized in that the inner peripheral portion of the transparent plate is pushed up by at least three pins.

[0017]

According to the above construction, the transparent plate is placed on the stamper so as to have a predetermined gap, the ultraviolet curing resin is filled between the stamper and the transparent plate, and the ultraviolet curing resin is irradiated with the ultraviolet rays. It is cured by and is bonded to this transparent plate. As a result, the ultraviolet curable resin on which the irregularities of the signal surface of the stamper have been transferred is held on the surface of the transparent disc, and an optical disc made of the transparent disc and the ultraviolet curable resin is formed.

After that, the transparent disk and the inner peripheral portion of the ultraviolet curable resin are pushed up by at least three pins, so that the optical disk is reliably separated from the stamper.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the examples described below are suitable specific examples of the present invention, and therefore, various technically preferable limitations are given, 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, and FIG. 2 is a partially enlarged view thereof. In these figures, the optical disc manufacturing apparatus 10 is
Stamper 11 with a fine uneven pattern formed on the surface
Mounting table 12 as a stamper holding part for fixing and holding the
The stamper inner diameter holding member 13 and the guide pin 14 are individually supported at the center of the mounting table 12 so as to be vertically movable with respect to the mounting table 12.

The stamper 1 is provided on the upper surface of the table 12.
1 is placed. In this state, this stamper 11
The peripheral edge of the hole 11a provided at the center of the hole is fixed and held to the upper surface of the mounting table 12 by the flange portion 13a of the stamper inner diameter pressing member 13.

The above structure is similar to the conventional optical disk manufacturing apparatus 1 shown in FIGS. 4 and 5, but the optical disk manufacturing apparatus 10 according to the present embodiment is different in the following points.

With respect to the mounting table 12 described above, a guide pin 14 is provided.
There are at least three push-up pins 15 (only one of which is shown in the drawing) as push-up means arranged at equal angular intervals on the outer circumference of the same circle. , Is supported so that it can move up and down. On the other hand, the stamper 11 has holes through which the push-up pins 15 pass when they rise.

Each push-up pin 15 has a bolt 1
It is connected to the linear shaft 17 via 6,
It may be an integral structure. Further, the linear shaft 17 is supported in a linear guide bush 19 mounted on a support member 18 so as to be vertically slidable.

Similarly, the guide pin 14 also has a linear guide bush 2 mounted on the support member 18 in the same manner.
It is slidably supported in the vertical direction.

Further, the guide pin 14 and the linear shaft 17 are connected to each other by a mounting portion 21 so as to be vertically movable integrally. This mounting part 2
1 has a mechanism in which the fixing member 21a located at the center thereof can fix and hold the vicinity of the lower end of the guide pin 14.

Optical disc manufacturing apparatus 10 according to the present embodiment
Is configured as described above, and operates in the following manner when manufacturing an optical disc.

First, the transparent plate 22 is placed on the surface of the stamper 11 with a slight gap. Here, the transparent plate 22 has a hole 22a provided at the center thereof.
However, by being fitted to the outer peripheral portion of the guide pin 14, it is positioned on the mounting table 12 (see FIG. 2).

In this case, since the protrusion 14a is provided at the lower edge of the outer peripheral portion of the guide pin 14, the transparent plate 22 has a predetermined gap with respect to the surface of the mounting table 12. So that it is retained.

From this state, the UV curable resin 23 is filled in the gap between the stamper 11 and the transparent plate 22 by means not shown. Then, by irradiating with ultraviolet rays, the ultraviolet curable resin 23 is cured.

At this time, the ultraviolet curable resin 23 is bonded to the lower surface of the transparent board 22. Thus, an optical disc is obtained in which the ultraviolet curable resin 23 to which the concave-convex pattern of the stamper 11 is transferred is joined to the lower surface of the transparent plate 22.

Finally, the lower end portion 21b of the mounting portion 21 is pushed upward by the means described below, as indicated by arrow A. Thereby, the guide pin 14 and the push-up pin 15
Move upward from the surface of the mounting table 12. Therefore, the ridge portion 1 provided on the lower edge of the outer peripheral portion of the guide pin 14
4a and the upper end 15a of each push-up pin 15 are transparent plate 2
2 and the inner peripheral portion of the ultraviolet curable resin 23 bonded to the lower surface thereof are pushed upward. Thus, the transparent plate 22 and the ultraviolet curable resin 23 are peeled off from the surface of the stamper 11 to complete an optical disk including the transparent plate 22 and the ultraviolet curable resin 23.

In this case, the transparent plate 22 and the ultraviolet curable resin 23 are separated from the stamper 11 by pushing the push-up pin 15
Can be performed by pushing up the inner peripheral portions of the transparent plate 22 and the ultraviolet curable resin 23.

Therefore, as in the case of the conventional optical disk manufacturing apparatus 1 shown in FIGS. 4 and 5, only the protrusion 5a of the guide pin 5 pushes up the inner peripheral edge of the transparent plate 6 and the ultraviolet curable resin 7. Not of. Therefore, the transparent plate 22 and the ultraviolet curable resin 23 are prevented from being broken by the excessively large force applied to the inner peripheral edges of the transparent plate 22 and the ultraviolet curable resin 23.

FIG. 3 shows the lower end portion 21 of the mounting portion 21 described above.
An example of a drive mechanism for pushing up b is shown. In FIG. 3, the drive mechanism is configured as an air cylinder 24, and the air cylinder body 24 b is fixedly held to the mounting table 12.

Therefore, the air cylinder 24 is operated,
When the rod 24a rises, this rod 24a
The lower end portion 21b of the mounting portion 21 is brought into contact with the lower end portion 21b and further raised to push up the lower end portion 21b. As a result, the guide pin 14 and the push-up pin 15 are raised.

Although the upper end of the rod 24a of the air cylinder 24 has a gap with the lower end 21b of the mounting portion 21 in the figure, the upper end of the rod 24a contacts the lower end 21b. Alternatively, the rod 24a may be mechanically fixed to the lower end 21b. Further, as the drive mechanism, any mechanism such as a rack and pinion mechanism can be used as long as it can cause a linear motion.

In the embodiment described above, the upper end of the push-up pin 15 is preferably flat as shown in FIG. 4 (A). As a result, the pressure applied to the transparent plate 22 and the ultraviolet curable resin 23 at the time of pushing up is reduced as much as possible. And, thereby, the harmful influence on the transparent board 22 and the ultraviolet curable resin 23 is eliminated.

The upper end of the push-up pin 15 is shown in FIG.
When it is formed in a convex shape as shown in FIG. 4B and a concave shape as shown in FIG.
2 and the contact area of the upper end of the push-up pin 15 with respect to the ultraviolet curable resin 23 becomes small. Therefore, there is a possibility that the pushing-up pressure will become excessive, and if the material of the transparent plate 22 is a brittle material, it may be broken.

The push-up pin 15 is provided on the transparent plate 2
So as not to scratch 2
It is preferably made of synthetic resin.

As described above, according to this embodiment, at the time of peeling the optical disk composed of the transparent plate and the ultraviolet curable resin from the stamper, the transparent plate and the inner peripheral portion of the ultraviolet curable resin are provided with at least three pins. Is configured to push up. As a result, the optical disc is pushed up with a relatively large contact area by the pins, and the pushing pressure is reduced.

Therefore, even in the case of an optical disc using a relatively large transparent disc having a diameter of, for example, about 30 cm, which is made of a brittle material such as glass, the transparent disc is pushed up when peeled from the stamper. There is nothing to destroy. Thus, since the birefringence index and the warp angle are almost zero, it is possible to easily manufacture the optical disc made of glass which is optimal as the reference disc for the signal characteristics and the calibration disc for the inspection machine.

[0043]

As described above, according to the present invention, there is provided an optical disk manufacturing method and method, wherein the transparent disk and the optical disk made of the ultraviolet curable resin bonded to the lower surface of the transparent disk are surely separated from the stamper. Can be provided.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of an optical disk manufacturing apparatus according to the present invention.

2 is a partially enlarged view of the optical disk manufacturing apparatus of FIG.

3 is a partial enlarged cross-sectional view showing the configuration of an example of a pin driving mechanism in the optical disc manufacturing apparatus of FIG.

FIG. 4 is a partial enlarged view showing various examples of forming the tip shape of the pin in the optical disc manufacturing apparatus of FIG.

FIG. 5 is a schematic side view showing an example of a conventional optical disc manufacturing apparatus.

6 is a partial enlarged cross-sectional view showing a main part of the optical disk manufacturing apparatus of FIG.

[Explanation of symbols]

 10 Optical Disc Manufacturing Equipment 11 Stamper 12 Mounting Table 13 Stamper Inner Diameter Holding Member 14 Guide Pin 15 Push-up Pin

Claims (6)

[Claims] 1. A transparent plate provided so as to have a gap between a stamper holding portion, which is a master disc of an optical disc, and a signal surface of a stamper held by the stamper holding portion; An optical disk manufacturing apparatus comprising: means for pushing up the transparent plate when the ultraviolet curable resin to be cured and the transparent plate are separated from the stamper. 2. The optical disk manufacturing apparatus according to claim 1, wherein the means for pushing up the transparent plate comprises at least three pins for pushing up the inner peripheral portion of the transparent plate. 3. The optical disc manufacturing apparatus according to claim 1, wherein the pin is vertically moved in synchronization with a driving mechanism. 4. The optical disk manufacturing apparatus according to claim 3, wherein the drive mechanism is an air cylinder. 5. The optical disk manufacturing apparatus according to claim 3, wherein the drive mechanism includes a rack and a pinion mechanism. 6. A transparent plate is arranged so as to have a slight gap with respect to a signal surface of a stamper, which is a master plate of an optical disc, and an ultraviolet curable resin is filled between the stamper and the transparent plate. After curing by irradiation, an ultraviolet curable resin having the irregularities of the signal surface of the stamper transferred thereto is joined to the transparent plate, and when the transparent plate is separated from the stamper, at least three pins are used. An optical disk manufacturing method, characterized in that the inner peripheral portion of a transparent plate is pushed up.