JP3049862B2 - Manufacturing method of information recording disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording disk such as an optical disk such as a compact audio disk, a video disk and a magneto-optical disk, and more particularly, a resin such as a photopolymer is applied to a disk substrate and the information recorded on a stamper is applied to the resin. And a method of manufacturing an information recording disk such as a so-called 2P method (photopolymerization method) for forming an information recording surface by transferring irregularities on a signal surface.

[0002]

2. Description of the Related Art When manufacturing an information recording disk such as an optical disk, as shown in FIG. 9, a stamper 2 having a signal surface 3 on which an uneven surface corresponding to recorded information is formed is prepared.
On the other hand, generally, light transmitting glass, PMMA (polymethyl methacrylate), PC
A liquid photopolymer resin is applied by screen printing to a circular pattern 13 concentric with the substrate 1 on the main surface 1a of the disk substrate 1 made of (polycarbonate), APO (amorphous polyolefin resin), or the like on which the information recording surface is formed. This is superimposed on the stamper 2 with its resin-coated surface facing the signal surface 3 of the stamper 2 and pressed with a thick pressing plate 10 to spread the resin on the main surface 1a and simultaneously with the signal surface of the stamper 2. The shape of No. 3, that is, unevenness information is transferred. Thereafter, the resin is exposed to ultraviolet light to cure the resin, and the substrate 1 is peeled off from the stamper 2 to obtain an intended information recording disk, for example, an optical disk, having an information recording surface formed by the resin surface.

However, a disk obtained by such a method is liable to generate a large number of fine air bubbles in a resin film thereof.
The generation of noise and the occurrence rate of defective products are increased.

Further, in the case of this method, the extent of the resin is selected to be, for example, 600 cps or less for the reason that it is desired to speed up the spread of the resin to some extent due to workability problems. The work leaks out of the disk substrate 1 and runs off the disk substrate 1 to remove the resin, which significantly impairs mass productivity.

[0005]

As described above, the present invention relates to a method for manufacturing an information recording disk such as a compact audio disk, a video disk, a magneto-optical disk, etc., in which an information recording surface made of a resin film is formed by a stamper. In the production of an information recording disk, there is no bubble on the resin surface, no leakage of the resin to the outside of the disk substrate, uniform formation of the information recording surface by spreading the resin and transferring the signal surface of the stamper Is performed reliably.

[0006]

According to the present invention, as shown in a plan view of FIG. 1, one of a signal surface 3 of a disk substrate 1 and a stamper 2 shown in a perspective view of FIG. In the disk substrate 1, a large-diameter arc-shaped first pattern 11 liquid resin application portion substantially along the outer peripheral edge and partially open, and inside the first pattern 11 and in the first pattern A liquid resin application portion of a small-diameter arc-shaped second pattern 12 having an opening portion opened in a direction opposite to the opening portion 11 and having edges 12A and 12B extending substantially radially at both ends of the opening portion; And are formed.

[0007] Then, as shown in FIG.
The disk substrate 1 is superimposed on the signal surface 3 of the stamper 2 via the liquid resin application portions of the first and second patterns 11 and 12, and a pressure roller is provided from the back side of the arc portion of the first pattern 11. 5 is rolled on the substrate 1, the disk substrate 1 is pressed against the signal surface 3 of the stamper 2, and the liquid resin is spread on the substrate 1 over the entire area on which the information recording surface is formed. Then, the shape of the signal surface 3 of the stamper 2 is transferred and the spread resin is cured to obtain an information recording disk having an information recording surface formed thereon.

[0008]

According to the present invention described above, the resin is spread uniformly over the surface of the disk substrate 1 on which information is to be formed,
In addition, this resin could be spread without protruding from the disk substrate 1 to the outer periphery thereof and without generating bubbles, and the signal surface 3 of the stamper 2 could be transferred satisfactorily and reliably.

That is, the present inventors have conducted diligent studies and studies, and as a result, as shown in FIG. 6A, the surface 1a of the disk substrate 1 on which the information recording surface is formed is located inside the outer peripheral edge of the surface 1a. A liquid resin is applied with a large-diameter arc-shaped first pattern 11 which is close to and partially open along the outer peripheral edge,
When this is pressed against the stamper 2 by the pressing roller 5 from the back side of the arc of the first pattern 11, that is, the side opposite to the open end, a crescent-shaped coating area is shown as hatched in FIG. 6B. It was confirmed that 131 could occur.

As shown in FIG. 7A, a liquid resin is applied to the center portion of the disk substrate 1 in a substantially semicircular pattern, that is, a pattern of only the circular pattern 12C of the second pattern 12 described above. When the pressure roller 5 is rolled on the stamper 2 from the open end side of the pattern 12C, FIG.
As shown by diagonal lines in B, it was confirmed that a band-shaped application region 32 was formed substantially in the radial direction from the center of the substrate 1 to the side where the arc pattern 12 was formed.

Further, as shown in FIG. 8A, two straight line segments extending in the radial direction of the disk substrate 1 at positions corresponding to both ends of the circular arc pattern 12C on the disk substrate 1. Twelve edge patterns 12A and 12
B, when the liquid resin is applied and the stamper 2 is overlaid on the stamper 2 in the same manner as described above, and the same pressing by the rolling of the pressing roller 5 is performed, as shown by hatching in FIG. 12B, it was confirmed that two strip-shaped application regions 133A and 133B were generated in the rolling direction of the pressure roller 5.

In the present invention, these coating regions 131 and 13
2, 133A and 133B, which are made based on the investigation of the spreading mode. By combining these coating modes, over the entire surface 1a of the disk substrate 1,
The liquid resin can be applied uniformly and without protruding outside the disk substrate 1.

[0013]

EXAMPLES The production method of the present invention will be described in detail with reference to examples. In the present invention, for example, as shown in FIG. 1, a light-transmissive glass disk, PMMA disk, PC disk,
A disk substrate 1 made of an APO disk is prepared, and first and second patterns 11 and 12 are formed on one main surface 1a on which an information recording surface is to be formed of a liquid resin such as an ultraviolet curable resin such as VDN1-103 ( Dainichi Seika Co., Ltd .: Product name, viscosity: 3.0 ± 0.3 poise at 25 ° C.).

The first pattern is formed in an arc with a radius slightly more than 90% of the radius of the disk substrate 1 at a position slightly eccentric with respect to the center of the disk substrate 1, and the open end thereof is directed in a direction opposite to the eccentric direction. Patterns that exist.

The second pattern 12 has a radius on the inner side of the first pattern, for example, approximately concentrically with the center of the disk substrate 1 and a little less than 40% of the radius of the disk substrate 1.
And a small-diameter arc pattern 12C slightly larger than a semicircle that is open to the side opposite to the open end side of the pattern 11, and the length at each end is slightly more than 30% of the radius of the disk substrate 1. And the edges 12A and 12B formed substantially parallel to the radial direction of the disk substrate 1.

The pattern application of the resin can be performed by an automatic application means for moving a nozzle for discharging the liquid resin onto the substrate 1 along a predetermined locus by a robot.

According to this method, the present invention can be applied to the formation of disks of various sizes only by changing the operation program of the coating means.

As shown in FIG. 2, the disk substrate 1 on which the liquid resin has been applied in this manner is used as the main surface 1a on the side on which the liquid resin is applied, as the signal surface 3 of the stamper 2, that is, the recorded information. As shown in FIG. 3, they are superposed so as to match the surface on which the corresponding uneven pattern is formed.

As shown in FIG. 3, the disk substrate 1 has, for example, a diameter of 100 mm from the back of the arc pattern of the first pattern 11, that is, from the arc-shaped bulging side, from the surface opposite to the main surface 1a. Pressure roller 5 of 2 to 10 kg / c
It is pressed and rolled at a pressure of m ² , for example, 3 kg / cm ² .
By doing so, the stamper 23 on the main surface 1a of the substrate 1
In this case, the resin is uniformly spread over the entire area of the ring-shaped pattern of the signal surface 3, that is, the recording information forming surface, and irregularities corresponding to the recording information are transferred to the ring portion.

Thereafter, as shown in FIG. 4, the stamper 2 is brought under an exposure light source 6, for example, an ultraviolet lamp for curing the resin, with the disk substrate 1 mounted thereon, and Is cured.

Thereafter, as shown in FIG.
The disk substrate 1 is peeled off. In this manner, a target information recording disk 21 having a resin film formed on one main surface 1a of the disk substrate 1 and an information recording surface formed thereon can be obtained.

The information recording disk 21 thus formed is formed by forming a resin film having a thickness of, for example, 10 μ without protruding from the disk substrate 1 in cooperation with the ring-shaped signal surface of the stamper 2. No bubbles were generated.

In the above-described example, an ultraviolet curable resin is used. However, various modifications can be made such that a light curable resin other than the ultraviolet light, a thermosetting resin, or the like can be used.

[0024]

As described above, according to the present invention, the resin for forming the information recording surface is formed on the disk substrate 1 by using the resin.
Further, since it can be formed without protruding, the operation for eliminating the protruding portion can be omitted or reduced, thereby improving mass productivity.

Further, since the generation of air bubbles on the resin surface can be avoided, the yield can be improved and the noise can be reduced.

In addition, since the application of the resin is automated by using a nozzle mechanism for ejecting the resin and a robot thereof, the automation of the production of the information recording disk can be easily performed together with the molding of the information recording surface by the stamper. It has many advantages such as peeling.

That is, when screen printing is performed by the conventional method described at the beginning, it is necessary to individually change the apparatus for each size disk, but in the present invention, each size can be achieved by the same means. .

[Brief description of the drawings]

FIG. 1 is a plan view of an example of a disk substrate showing a resin coating pattern in a method for manufacturing an information recording disk according to the present invention.

FIG. 2 is a perspective view (part 1) illustrating an example of a method of manufacturing an information recording disk according to the present invention in one manufacturing step;

FIG. 3 is a perspective view (part 2) illustrating an example of a method for manufacturing an information recording disk according to the present invention in one manufacturing step;

FIG. 4 is a perspective view (part 3) illustrating an example of a method for manufacturing an information recording disk according to the present invention in one manufacturing step;

FIG. 5 is a perspective view (No. 4) of one example of the manufacturing method of the information recording disk according to the present invention in a manufacturing step;

FIG. 6 is a diagram showing a relationship between a resin application pattern and its spreading.

FIG. 7 is a diagram showing a relationship between a resin application pattern and its spreading.

FIG. 8 is a diagram showing a relationship between a resin application pattern and its spread.

FIG. 9 is an explanatory view of a conventional information recording disc manufacturing method.

[Explanation of symbols]

 Reference Signs List 1 disc substrate 2 stamper 3 signal surface 5 pressure roller 6 exposure light source 11 first pattern 12 second pattern 12C circular arc pattern 12A edge 12B edge

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 7/26

Claims (1)

(57) [Claims] 1. A large-diameter arc-shaped first pattern liquid resin application part which is substantially along the outer peripheral edge and partially open on one of a signal surface of a disk substrate and a stamper; A small-diameter arc-shaped second portion having an opening portion that is opened inside the pattern of the first pattern and in the opposite direction to the opening portion of the first pattern, and has edges extending substantially in the radial direction at both ends of the opening portion. Forming a liquid resin coating portion of the pattern; and superposing the disk substrate on the signal surface of the stamper via the liquid resin coating portion, and pressing the pressure roller from the back side of the arc portion of the first pattern. Rolling, pressing the disc substrate against the signal surface of the stamper to spread the liquid resin, and transferring the signal surface shape of the stamper to the spread resin surface to transfer the spread resin. Cured to form an information recording surface A method for manufacturing an information recording disk, comprising obtaining an information recording disk.