JPH01176517A - Manufacture of information recording medium - Google Patents

Abstract

PURPOSE:To prevent resin from leaking and print the resin stably by forming hexagonal patterns on the pressure starting end side of a pressure roller, and also forming given resin replenishing patterns in the areas other than a central opening section and an outer peripheral section and given printing patterns in the other areas. CONSTITUTION:Resin is printed on a disc base 1, and crescent-shaped hexagonal patterns 13A are formed in a half-round area on the pressure starting end side of a pressure roller. A plurality of resin replenishing patterns 15A are formed in the areas other than the area in which the hexagonal patterns 13A are formed and the peripheral area of a central opening section 14 of the disc base 1, while printing patterns 17A of small diameter shape are formed in the area other than the area in which the hexagonal patterns 13A and the replenishing patterns 15A are formed. Then, crescent-shaped printed patterns 116A are formed along the central opening section 14 in the half-round-shaped area on the pressurizing end side of a pressure roller 4 are formed, and the replenishing patterns 15A are formed along the area in which patterns 16A other than the outer peripheral section area are formed, while the printed patterns 17A of small diameter shape are formed in the remaining outer peripheral section area.

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 suitable for application to, for example, a method for manufacturing an optical disc such as a compact audio disc (CD).

B. Summary of the Invention The present invention is a method for manufacturing an information recording medium, in which resin is printed at predetermined positions on a disk substrate to form a hexagonal pattern, a resin replenishment pattern, and a small-diameter printed pattern. can be manufactured efficiently.

C. Conventional technology Conventionally, in the manufacturing method of information recording media, optical discs were duplicated using ultraviolet curing resin2.
P (photo polymerization)
A law is proposed.

That is, as shown in FIG. 3, after uniformly printing the ultraviolet curable resin 2 on one side of the disk substrate 1 using a screen printing method (FIG. 3 (A)), the printed surface of the ultraviolet curable resin 2 is Place the disc substrate 1 on the disc stamper 3 so that it is in close contact with the disc stamper 3 (
Figure 3 (B)) Pressed with pressure roller 4 Figure 3 (C)
).

As a result, the gap between the disk substrate 1 and the disk stamper 3 is filled with the ultraviolet curing resin 2, and after the ultraviolet curing resin 2 is cured using the ultraviolet lamp 5 (FIG. 3(D)).
By peeling off the disk substrate 1 from the disk standber 3, fine irregularities formed on the surface of the disk standber 3 can be transferred onto the disk substrate 1 (FIG. 3(E)).

Therefore, the problem that the Disc Stamper D invention attempts to solve by depositing a metal film on the transferred uneven surface and then forming a protective film. When printing on the disc substrate 1, there was a problem in that the ultraviolet curable resin leaked from the disk substrate 1 when pressure was applied by the pressure roller 4, staining the pressure roller 4, the disk standber 3, and the disk substrate 1.

Furthermore, in normal screen printing, it is unavoidable that fine air bubbles are mixed into the ultraviolet curable resin coated on the disk substrate 1, and defects are generated on the surface of the cured ultraviolet curable resin, ensuring that no pits are formed. There was a problem that it was difficult to form.

As shown in FIG. 4, one method for solving this problem is to use a metal plate 6 in which a plurality of through holes 5 are formed in the disk substrate at positions other than the central opening in place of the screen.
A method of printing an ultraviolet curable resin using a method has been proposed (Japanese Patent Application Laid-open No. 111198/1983).

If screen printing is performed using such a sheet metal 6, leakage of the ultraviolet curing resin and inclusion of fine air bubbles can be reduced, and the spectroscopic disk can be manufactured efficiently.

However, even when screen printing is performed using such a sheet metal 6, it is difficult to completely prevent leakage of the ultraviolet curing resin, and this problem is still insufficient as a solution.

Furthermore, as the number of printing increases, distortion occurs in the crescent-shaped through-hole group 5a formed at the pressure start end side of the pressure roller, and eventually the through-hole group 5a gets caught on the squeegee. There is a problem that the sheet metal 6 may be damaged.

The present invention has been made in consideration of the above points, and is an information recording medium that can prevent ultraviolet curable resin from leaking and can stably apply ultraviolet curable resin by preventing distortion from occurring. The purpose of this paper is to propose a manufacturing method for .

E Means for Solving Problems In order to solve these problems, in the present invention, resin 2 is printed on disk substrate 1 using sheet metal 12 provided with predetermined through holes 13, 15, 16, 17. After that, the disk substrate l is placed on the stamper 3 so as to sandwich the resin 2 therebetween, and the disk substrate 1 is pressed by the pressure roller 4 to harden the resin 2. Then, the resin 2 is removed from the stamper 3 together with the disk substrate 1. In a method for manufacturing an information recording medium in which the fine unevenness formed on the stamper 3 is peeled off and transferred to the disk substrate 1, the resin 2 is printed on the disk substrate 1, and the resin 2 is applied with the pressure roller 4. In the semicircular area on the starting end side,
A crescent-shaped hexagonal pattern 13A is formed, and a resin replenishment pattern 15A is formed avoiding the area where the hexagonal pattern 13A is formed and the peripheral area of the central opening 14 of the disk substrate 1.
A printed pattern 17A having a smaller diameter than the resin replenishment pattern 15A is formed in an area other than the area where the hexagonal pattern 13AB and the resin replenishment pattern 15A are formed.
A crescent-shaped printing pattern 16A is formed along the central opening 14 in a semicircular region on the pressure end side of the pressure roller 4, and a crescent-shaped printing pattern 1 is formed.
A resin replenishment pattern 15A is formed along the region in which the resin replenishment pattern 15A is formed, avoiding the outer peripheral edge region, and a printed pattern having a smaller diameter than the resin replenishment pattern 15A is formed in the remaining outer peripheral region. 17A.

By forming a pattern in the areas of the pressure start end side and the pressure end side of the F action pressure roller 4, avoiding the center opening 14 and the outer peripheral edge, respectively, when applying pressure with the pressure roller 4, It is possible to prevent the resin 2 from leaking.

Furthermore, by forming the hexagonal pattern 13A in the area on the pressure start end side of the pressure roller 4, it is possible to prevent distortion from occurring.

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

In FIG. 1, 10 indicates the ultraviolet curing resin 2 as a whole.
(FIG. 3) shows a screen used when screen printing is performed on the disk substrate 1, and is composed of a sheet metal 12 fixed to an aluminum alloy frame 11.

The sheet metal 12 is made of a flat stainless steel plate with a thickness of about 50 [μm], and has a side of about 3 [μm] in an area approximately half the circumference in the direction of entry of the roller out of the area corresponding to the outer peripheral edge of the disk substrate.
(m+n) hexagonal through holes 13 are densely arranged to form a crescent-shaped hexagonal pattern as a whole.

Therefore, as shown in FIG. 2, when the ultraviolet curing resin 2 is printed on the disk substrate 1, a semicircular area on the pressure start end side of the pressure roller 4 corresponding to the hexagonal through hole 13 is formed. , a crescent-shaped tortoiseshell pattern 13 is formed along the outer periphery.
A is formed.

In other words, the area where the turtle shell pattern 13A is printed is
Since it is located at the pressure start end side of the pressure roller 4, the ultraviolet curing resin 2 printed in this area is expanded as the pressure roller 4 moves, and fills the gap between the disk stamper 3 and the disk substrate 1. be done.

Therefore, if the amount of the ultraviolet curable resin 2 printed in the area is small, there is a risk that an area will not be sufficiently filled with the ultraviolet curable resin 2.

In this embodiment, the hexagonal through-holes 13 are densely arranged on the sheet metal 12 to form the hexagonal pattern 13A, so that the ultraviolet curable resin 2 can be sufficiently printed in this area, and the pressure roller It is possible to prevent the occurrence of an unfilled area when stretched in step 4.

Furthermore, at this time, the tortoise shell pattern 13A has a side of about 3
By forming a group of through-holes as small as (mm), it is possible to obtain a uniform film thickness when printing ultraviolet curable resin, compared to the case where a large-area crescent-shaped pattern is formed, and it is possible to obtain a uniform film thickness for each disk substrate. It is possible to reduce the disturbance in the film thickness between 1 and 2.

Furthermore, by making each through-hole 13 hexagonal, it is possible to effectively avoid the distortion that occurs when printing ultraviolet curable resin, compared to the case where a square-shaped through-hole is used, and the stability is improved accordingly. can be printed with ultraviolet curing resin.

Further, the sheet metal 12 has a rectangular through hole 16 arranged in the peripheral area of the central opening 14, and when the ultraviolet curing resin 2 is printed, the sheet metal 12 has a crescent-shaped overall shape so as to face the crescent-shaped hexagonal pattern 13A. A printed pattern 16A is formed.

Therefore, in the crescent-shaped printed pattern 16A, as in the case of the crescent-shaped hexagonal pattern 13A described above, it is possible to prevent an unfilled area from occurring along the central opening 14.

Further, the sheet metal 12 has a central opening 14 of the disk substrate 1 in a semicircular region on the pressure start end side of the pressure roller 4.
A penetration of about 8 [ll1 m] in diameter is made along the hexagonal pattern 13A while avoiding the peripheral area of the disk substrate, and in the remaining semicircular area along the crescent-shaped printed pattern 16A while avoiding the outer peripheral edge of the disk substrate. A plurality of holes 15 are provided.

Therefore, when printing ultraviolet curing resin, the through hole 1
5, a plurality of circular printed patterns 15A are formed in a semicircular region on the pressure start end side of the pressure roller 4, avoiding the region where the hexagonal pattern 13A is formed and the peripheral region of the central opening 14. A crescent-shaped printing pattern 16A is formed in the area on the end side of the pressure application of the pressure roller 4.
A plurality of circular print patterns 15A are formed along the periphery and avoiding the outer peripheral edge area.

That is, on the disk substrate 1, the hexagonal pattern 13
A and the ultraviolet curing resin 2 forming the printed pattern 15A
As the pressure roller 4 moves, the resin is expanded and filled into the gap between the disk substrate 1 and the disk stamper 3, and as a result, the amount of resin subjected to stretching gradually decreases as the pressure roller 4 moves. .

Therefore, in this embodiment, the ultraviolet curable resin 2 is printed through the through hole 15 to replenish the amount of the ultraviolet curable resin 2 that decreases as the pressure roller 4 moves.

Further, on the pressure start end side of the pressure roller 4, a through-hole is formed avoiding the peripheral area of the central opening 14 of the disk substrate 1, and in the remaining semicircular area, avoiding the outer peripheral edge of the disk substrate 1. 15, the pressure roller 4
When the resin approaches the central opening 14 of the disk substrate l and the outer periphery in the direction of movement of the pressure roller, the amount of resin that extends gradually decreases and the ultraviolet curing resin is released from the central opening 14 and the outer periphery. The ultraviolet curing resin 2 is sufficiently filled to the extent that the resin 2 does not leak out.

Thus, the printed pattern 15A forms a resin replenishment pattern that replenishes the amount of ultraviolet curing resin 2 that decreases as the pressure roller 4 moves.

Further, in the sheet metal 12, a circular through hole 17 having a smaller diameter than the through hole 15 is arranged at a predetermined position in an area corresponding to the disk substrate 1 among the remaining areas where the through holes 13, 15 and 16 are not formed. has been done.

The diameter of the through hole 17 is set to approximately 4 [ll1 m], and as a result, on the disk substrate 1, the through hole 17 is
7, a printed pattern 17A having a smaller diameter than the resin replenishment pattern 15A is formed.

The ultraviolet curing resin of the printed pattern 17A is
3. It acts as a cushioning material when the disk substrate 1 is placed on the disk stamper 3 together with the ultraviolet curing resin 2 printed through 15 and 16, and prevents direct contact between the disk substrate 1 and the disk stamper 3. By doing so, it is possible to prevent the occurrence of zigzag deformation, etc. that may occur due to direct contact.

Furthermore, since the printed pattern 17A has a smaller diameter than the resin replenishment pattern 15A, by selecting the arrangement position and number of the printed pattern 17A to predetermined values, the ultraviolet rays printed on the disk substrate 1 can be Cured resin 2
The distribution and amount of resin can be finely adjusted by 8 degrees.

Thus, after printing the ultraviolet curable resin 2 using the screen 10 made up of the sheet metal 12, by pressing the disc stamper 3 with the pressure roller 4, leakage of the ultraviolet curable resin 2 can be prevented. The fine shape of the disk stamper 3 can be stably transferred.

According to the above configuration, the hexagonal pattern 15A is formed in the region on the pressure start end side of the pressure roller 4, thereby preventing the occurrence of distortion and stably printing the ultraviolet curable resin. be able to.

=14-Furthermore, in the area on the pressurization start end side and the pressurization end side,
By forming a pattern for resin replenishment avoiding the central opening and the outer periphery, and forming a predetermined printing pattern in the remaining areas, leakage of ultraviolet curable resin when pressurized with a pressure roller is prevented. can be prevented.

In this way, leakage of the ultraviolet curable resin can be prevented and the ultraviolet curable resin can be stably printed, so that the optical disc can be manufactured efficiently as a whole.

In the above-mentioned embodiment, the case where the printed patterns are arranged as shown in FIG. 2 has been described, but the method of arranging the printed patterns is not limited to this.
The arrangement may be changed depending on the conditions of screen printing such as the pressure of a squeegee, the conditions of pressure using a pressure roller, the required film thickness of the ultraviolet curing resin, and the like.

Further, in the above-described embodiment, a case has been described in which an optical disc such as a compact audio disc is manufactured, but the present invention is not limited to this, and the present invention is not limited to this, but the present invention is also applicable to the manufacturing of optical discs such as video discs, and information recording media such as magneto-optical discs. The method can be widely applied.

Further, in the above-mentioned embodiments, a case was described in which an ultraviolet curing resin was used, but the present invention is not limited to this, and can be widely applied to, for example, thermosetting resins.

H Effects of the Invention As described above, according to the present invention, a hexagonal pattern is formed on the pressure start end side of the pressure roller, and a pattern for resin replenishment is formed in other areas while avoiding the central opening and the outer peripheral edge. By forming the printing pattern, it is possible to prevent the resin from leaking and to print the resin stably, thus making it possible to efficiently manufacture the information recording medium.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a screen according to an embodiment of the present invention, Fig. 2 is a plan view showing its printed pattern, Fig. 3 is a perspective view showing the manufacturing process, and Fig. 4 is a plan view showing the screen. It is. 1... Disc substrate, 2... Ultraviolet curing resin, 3... Disc stamper, 4...
...Pressure roller, 6.12... Sheet metal, 5.13
．． 15.16.17...Through hole, 13A...
... Tortoise shell pattern, 15A ... Pattern for resin replenishment.

Claims (1)

[Claims] After printing resin on a disk substrate using a sheet metal having predetermined through holes, the disk substrate is placed on a stamper so as to sandwich the resin, and the disk substrate is pressurized. After the resin is cured by pressing with a roller, the resin is peeled off from the stamper together with the disk substrate, and the fine uneven shape formed on the stamper is transferred to the disk substrate. In the manufacturing method, the resin is printed on the disk substrate to form a crescent-shaped hexagonal pattern in a semicircular area on the pressure start end side of the pressure roller, and the area where the hexagonal pattern is formed. A plurality of predetermined circular resin replenishment patterns are formed avoiding the peripheral area of the central opening of the disk substrate, and resin replenishment patterns are formed in areas other than the area where the tortoiseshell pattern and the resin replenishment pattern are formed. A crescent-shaped printing pattern is formed along the central opening in a semicircular area on the pressure end side of the pressure roller. A plurality of resin replenishment patterns are formed along the area where the print pattern is printed, avoiding the outer peripheral edge area of the disk substrate, and a plurality of resin replenishment patterns are formed in the remaining outer peripheral area. 1. A method of manufacturing an information recording medium, characterized in that a small-diameter print pattern is formed by