JP2526618B2 - Method for manufacturing information recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A Field of Industrial Application The present invention relates to a method for manufacturing an information recording medium, and is preferably applied to a method for manufacturing an optical disk such as a compact audio disk (OD).

B. SUMMARY OF THE INVENTION The present invention is a method for manufacturing an information recording medium, which is a high-quality information recording medium with a simple method as a whole by pressing a substrate using a predetermined region of a pressing surface of a pressure roller. Can be manufactured.

C Prior Art Conventionally, in a method of manufacturing an information recording medium, an optical disk is duplicated using an ultraviolet curable resin.
A 2P (photo polymerization) method has been proposed (Japanese Patent Application Nos. 61-111199 and 61-146731).

That is, as shown in FIG. 3, after the ultraviolet curable resin 2 is uniformly printed on one side of the disk substrate 1 by using the screen printing method (FIG. 3 (A)), the printed surface of the ultraviolet curable resin 2 is printed. So that it closely contacts the disk stamper 3,
The disk substrate 1 is placed on a disk stamper 3 (FIG. 3 (B)) and pressed by a pressure roller 4 (FIG. 3 (C)).

As a result, the ultraviolet curable resin 2 is filled in the gap between the disk substrate 1 and the disk stamper 3, and after the ultraviolet curable resin 2 is cured by using the ultraviolet lamp 5 (FIG. 3 (D)), the ultraviolet curable resin 2 is removed. By separating from the disk stamper 3 together with the disk substrate 1, it is possible to form a transfer layer on the disk substrate 1 on which fine irregularities of the disk stamper 3 have been transferred (FIG. 3 (E)).

Accordingly, by depositing a metal film on the surface of the transfer layer and then forming a protective film, it is possible to obtain the optical disk 6 having the pits formed according to the unevenness of the disk stamper 3 (FIG. 3 (F)). ).

D Problem to be Solved by the Invention By the way, in order to reliably transfer fine irregularities of the disk stamper 3 to obtain a high-quality optical disk, the transfer layer should have a uniform thickness so that the transfer layer has a uniform thickness. It is necessary to press the disk substrate 1 with pressure.

That is, when the pressing force applied by the pressure roller 4 is locally large, the gap between the disk stamper 3 and the disk substrate 1 becomes narrower as the pressing force becomes larger, so that the film thickness of the transfer layer becomes smaller. In extreme cases, the disk substrate 1 may come into contact with the disk stamper 3 by planting, which may damage the disk stamper 3.

On the contrary, when the pressing force by the pressure roller 4 is partially small, the gap between the disk stamper 3 and the disk substrate 1 is correspondingly increased, and the film thickness of the transfer layer is increased. In addition, there is a possibility that a region where the ultraviolet curable resin 2 is not sufficiently filled may be formed in the gap between the disk substrates 1 or bubbles may be mixed.

In particular, when the glass disk substrate 1 is used, there is a problem that the film thickness of the transfer layer greatly changes even when the pressing force changes little, and it is more uniform than when the plastic disk substrate 1 is used. It is necessary to press the disk substrate 1 with a sufficient pressing force.

For this reason, in the pressure roller 4, the pressing surface is polished into a perfect circle so that the disk substrate 1 can be pressed with a uniform pressing force.

However, the pressing surface of the pressure roller 4 is inevitably deformed by several tens of μm due to the influence of heat generated during polishing, internal distortion, etc., and it is difficult to press the disk substrate 1 with a uniform pressing force. There is a problem.

Therefore, the film thickness of the transfer layer becomes non-uniform accordingly, and there is a problem that it is difficult to reliably transfer the fine irregularities of the disk stamper 3.

The present invention has been made in consideration of the above points, and proposes a method for manufacturing an information recording medium in which fine irregularities of a disk stamper can be reliably transferred to obtain a high-quality optical disk. Is.

E Means for Solving the Problems In order to solve the above problems, in the present invention, after the resin 2 is applied on the substrate 1, the substrate 1 is sandwiched so as to sandwich the resin 2.
Is placed on the stamper 3, the substrate 1 is pressed by the pressure roller 10 to cure the resin 2, and then the resin 2 is peeled off from the stamper 3 together with the substrate 1 to form a fine uneven shape formed on the stamper 3. In the method of manufacturing the information recording medium, which is configured to transfer the data to the substrate 1, the pressure roller 10 having a diameter larger than the size of the substrate 1 is used to press the substrate 1 and
By synchronizing the rotation of the pressure roller 10 with the pressing operation of (1), the substrate 1 is pressed on a predetermined area of a part of the pressing surface of the pressure roller 10.

F action If the substrate 1 is pressed only by using a predetermined area of the pressure roller 10, the substrate 1 is pressed only by the area of the pressing surface of the pressure roller 10 where a uniform pressing force can be obtained. be able to.

G Embodiment One embodiment of the present invention will be described in detail below with reference to the drawings.

(G1) First Embodiment As shown in FIG. 1 with the same symbols as those in FIG. 3, the diameter of the disk substrate 1 is larger than that of the disk substrate 1 in this embodiment. By using the pressure roller 10, only part of the pressing surface of the pressure roller 10 is used to press the disk substrate 1.

Further, the pressure roller 10 is rotatably held around the rotary shaft 10A and is vertically moved up and down. When the disk substrate 1 is pressed, the pressure roller 10 is lowered to a predetermined position, and then the disk stamper 3 is indicated by an arrow. By moving the disk stamper 3 in this direction, the disk substrate 1 is rotated in a pressed state according to the movement of the disk stamper 3.

Further, a weight 12 is fixed to the end surface 10B of the pressure roller 10 via an L-shaped mounting member 11.

As a result, after pressing the disk substrate 1, the pressure roller
When 10 rises, the pressure roller 10 is rotated so that the mounting position of the weight 12 is directly below the rotating shaft 10A due to the weight of the weight 12, and thus the pressing surface of the pressure roller 10 is always The disk substrate 1 can be pressed using a predetermined partial area.

Thus, the weight 12 synchronizes the rotation of the pressure roller 10 with the pressing operation of the disk substrate 1 so that the disk substrate 1 is pressed in a predetermined area of the pressing surface of the pressure roller 10. Make up.

Therefore, by selecting the mounting position of the weight 12 at a predetermined position, the disk substrate 1 can always be pressed using only the most uniformly polished region of the pressing surface of the pressure roller 10.

That is, the pressure-sensitive sheet that develops color according to the pressure is pressed by the pressure roller 10 to select an area where the most uniform pressing force is obtained, and the weight 12 is pressed to press the disk substrate 1 in the area. Select the mounting position of.

By doing so, the disk substrate 1 can be pressed in the region of the pressure roller 10 where the most uniform pressing force can be obtained, with a simple configuration in which the weight 12 is simply attached.
It is possible to obtain a transfer layer having a uniform film thickness, and it is possible to reliably transfer the fine irregularities of the disk stamper.

Further, since the pressing area can be pressed using the same area, the disk substrates 1 can be pressed with the same pressing force. Therefore, it is possible to reduce the variation of the transfer layer between the optical disks, and it is possible to obtain a high-quality optical disk with a good yield.

In the above structure, the pressure roller 1 is lowered with the weight 12 directly below the rotary shaft 10A, and the disk stamper 3 is moved.
The disk substrate 1 placed above is pressed.

When the pressing of the disk substrate 1 is completed, the pressure roller 10 rises, and the pressure roller 10 rotates so that the weight 12 is directly below the rotation shaft 10A.

Thus, the disk substrate 1 can always be pressed by using a predetermined area of the pressing surface of the pressure roller 10.

According to the above configuration, the pressure roller 10 having a diameter larger than that of the disk substrate 1 is used, and the rotation of the pressure roller 10 is synchronized with the pressing operation of the disk substrate 1, so that the pressing surface is always exposed. The disk substrate 1 can be pressed by using a predetermined area of the disk substrate 1, and the disk substrate 1 can be pressed with a uniform pressing force.

Therefore, a transfer layer having a uniform film thickness can be obtained,
It is possible to obtain a high-quality optical disc in which fine irregularities of the disc stamper are surely transferred.

(G2) Second Embodiment As shown in FIG. 2 with the same reference numerals as those in FIG. 1, the end face of the pressure roller 10 is used in the second embodiment.
The position of the cylindrical projection 15 attached to 10B is detected by the limit switch 16, and the motor 17 is driven based on the detection result, whereby the pressure roller 10 is rotated with respect to the pressing operation of the disk substrate 1. It is designed to be synchronized.

That is, when the pressing of the disk substrate 1 is completed, the pressure roller 10 is rotated in the reverse direction by rotating the motor 17 according to the control signal S1 output from the control circuit 18.

The pressure roller 10 reverses and the projection 15 has a limit switch 16
When is pressed, the limit switch 16 is switched to the ON state, whereby the rotation of the motor 17 is stopped and controlled via the control circuit 18.

Therefore, the pressing of the disk substrate 1 is always started from the position where the projection 15 presses the limit switch 16, and the disk substrate 1 can be pressed using a part of the pressing surface.

Thus, in this embodiment, the projection 15, the limit switch 16, the motor 17 and the control circuit 18 constitute a synchronizing means for synchronizing the rotation of the pressure roller 10 with the pressing operation of the disk substrate 1.

Therefore, by selecting the region as a region having a uniform pressing force, the disk substrate 1 can always be pressed with a uniform pressing force as in the case of the first embodiment.

According to the configuration of FIG. 2, even if a motor is used as the synchronizing means, the same effect as in the case of the first embodiment can be obtained.

In the above embodiment, when the motor is used as the synchronization means, the limit switch 16 is used to detect the rotational position of the pressure roller 10, but the present invention is not limited to this and, for example, the pressure roller is used. A rotary position detecting means such as a rotary encoder may be attached to the rotary shaft 10A of 10 to detect the rotary position of the pressure roller 10.

Further, as the synchronizing means, not only the case of driving the motor and the case of attaching the weight, but various methods can be widely applied.

Further, in the above-mentioned embodiment, the case where a region having a uniform pressing force is selected using the pressure sensitive sheet has been described.
The present invention is not limited to this. For example, the smoothness of the pressure roller may be measured using a dial gauge or the like, and the area for pressing the disk substrate may be selected.

Furthermore, in the above-mentioned embodiment, the case where the ultraviolet curing resin is applied to the substrate by using the screen printing method is described, but the application method of the ultraviolet curing resin is not limited to this, and various applying methods can be widely applied. You can

Further, in the above-mentioned embodiments, the case of manufacturing an optical disk has been described, but the present invention is not limited to this, and is widely applied to a method of manufacturing a card-shaped optical information recording medium and further an information recording medium such as a magneto-optical disk. Can be applied.

Furthermore, in the above-mentioned embodiment, the case where the ultraviolet curable resin is used is described, but the present invention is not limited to these and can be widely applied to, for example, a thermosetting resin.

H Effect of the Invention As described above, according to the present invention, since the substrate is pressed by using a predetermined area of the pressing surface of the pressure roller, the fine unevenness of the stamper can be entirely and simply performed. Can be reliably transferred, and thus a high quality information recording medium can be obtained.

[Brief description of drawings]

1 is a perspective view showing a first embodiment of the present invention, and FIG.
FIG. 3 is a perspective view showing the second embodiment, and FIG. 3 is a perspective view showing a manufacturing process of an optical disc. 1 ... Substrate, 2 ... UV curable resin, 3 ... Stamper,
4, 10 ... Pressure roller.

Claims (1)

(57) [Claims] 1. A resin is applied onto a substrate, the substrate is placed on a stamper so as to sandwich the resin, the substrate is pressed by a pressure roller to cure the resin, and the resin is then removed. In the method of manufacturing an information recording medium, the substrate and the substrate are separated from the stamper, and the fine irregularities formed on the stamper are transferred to the substrate, wherein the diameter is larger than the size of the substrate. By pressing the substrate using the pressure roller and synchronizing the rotation of the pressure roller with the pressing operation of the substrate, the substrate is pressed in a predetermined area of the pressing surface of the pressure roller. A method of manufacturing an information recording medium, characterized in that