JPH10334520A - Disk sticking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk sticking method capable of reducing the number of sticking processes of disks and also capable of enhancing the quality of a stuck disk. SOLUTION: In this sticking method, at the time of sticking two sheets of disks 1A, 1B, the disks 1A, 1B are opposed and centers of the disks are clamped and one part of the periphery of the disks is separated and sticking agent 2 is infiltrated in between the disks by moving the separated part while rotating the disks and while pouring the sticking agent 2 in between them from the separated part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk for recording information, and more particularly to a method for bonding disks in a high recording density disk having a bonding structure.

[0002]

2. Description of the Related Art In recent years, with the development of personal computers and video games, the amount of information used by individuals has increased dramatically. Initially, text data with a capacity of about 1 megabyte was mainly stored. However, with the complexity and sophistication of application software, storage of binary data and text data with a capacity of several gigabytes has been required.

For this reason, even in a read-only disc, a CD-ROM which is a conventionally used optical disc is used.
Instead of DVD (D
igita1 Versati1e Disc) is about to be used. The feature of this DVD is thickness 0.6m
This is a point that two disks having a diameter of 120 mm and a diameter of 120 mm are bonded together.

[0004] An example of a conventional disk bonding method will be described with reference to FIGS. In the conventional method of laminating disks, a spin coater 20 as shown in FIG.
Is used. Here, the spin coater 20 has a configuration in which a pedestal 23 is fitted in the middle of a rotating shaft 22 of a spindle motor 21. The rotating shaft 22 is formed so as to have an outer diameter substantially equal to the inner diameter of the disk 1A. The pedestal 23 has a substantially disk-like shape with the inner diameter of the rotating shaft 22 and the outer diameter of the disk 1A, and has a disk-like shape provided with a ring-shaped convex portion that supports the inner and outer peripheral edges of the disk 1A. It is created as follows.

[0005] First, one disk 1A is inserted into the rotating shaft 22 and mounted on the pedestal 23 (see FIG. 8). An appropriate amount of the bonding agent 2 is dropped in a circular shape on the inner peripheral side of the disk 1A (see FIG. 9). Another disc 1B is inserted into the rotating shaft 22, and placed on the disc 1A on which the bonding agent 2 has been dropped (see FIG. 10). Then, it waits until the bonding agent 2 penetrates between the disks 1A and 1B by capillary action (see FIG. 11).

Next, the spindle motor 21 is driven to rotate the disks 1A and 1B at a high speed.
Excess adhesive 2 between A and disk 1B is shaken off (see FIG. 12). Finally, the UV (ultraviolet) lamp 24 disposed above the disks 1A and 1B is turned on, and ultraviolet rays are applied to the bonding agent 2 between the disks 1A and 1B to cure the bonding agent 2 (FIG. 13). reference).

[0007]

However, if air bubbles or the like are mixed in the bonding layer made of the bonding agent 2, the cause of defective appearance of the disk, uneven thickness, increase of error signals, deterioration of characteristics during an environmental test, and the like. Therefore, mixing of bubbles and the like into the bonding layer must be avoided. In the above-described conventional method of bonding disks, FIGS.
The step of placing the disk 1B on the disk 1A and the step of causing the bonding agent 2 to penetrate between the disk 1A and the disk 1B determine the degree of air bubbles and the like mixed into the bonding layer.

[0008] The causes of the increase in the degree of air bubbles and the like mixed into the bonding layer are as follows: the first contact points of the two disks 1A and 1B are planar; and the two disks 1A and 1B
Since the spread of the contact portion is linear and fan-shaped, the spread of the contact portion becomes uneven due to unevenness of the bonding layer. Therefore, in order to reduce the degree of air bubbles and the like mixed into the bonding layer, it is necessary to slowly place the disk 1B on the disk 1A and to allow the bonding agent 2 to slowly penetrate between the disks 1A and 1B. . As described above, in the related art, there is a problem that the shortening of the time for bonding the disks and the improvement of the quality of the disks themselves are contradictory.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a disk bonding method capable of reducing the number of steps for bonding disks and improving the quality of disks. And

[0010]

According to the present invention, when two disks are bonded to each other, the disks are opposed to each other, the center of the disks is clamped, and the outer periphery of the disks is fixed. This is achieved by disengaging a part, rotating the disk while injecting the bonding agent from the divergence point, moving the divergence point, and allowing the bonding agent to permeate between the disks.

[0011] According to the above configuration, the movement of contact between the two disks can be made into a point, so that a high-quality disk can be manufactured without sticking in the bonded layer while being bonded in a short time. can do.

[0012]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The embodiment described below is a preferred specific example of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these embodiments unless otherwise specified in the following description.

FIGS. 1 to 7 are views for explaining an embodiment of a method of bonding disks according to the present invention, which will be described below with reference to the drawings. First, two disks 1A,
1B (see FIG. 1), and clampers 10A and 10B
To clamp the center of each of the disks 1A and 1B from both sides (see FIG. 2). In this state, each disk 1
A part of the outer periphery of A and 1B is disengaged, and an injection tube 11a of an injection device 11 for injecting the bonding agent 2 is inserted between the disc 1A and the disc 1B from the disengagement point (see FIG. 3).

The tip of the injection tube 11a is connected to each disk 1A, 1
When reaching the vicinity of the clamp portion B, the injection device 11 is operated to drop an appropriate amount of the bonding agent 2 from the tip of the injection tube 11a between the disk 1A and the disk 1B. Then, while continuously dropping the bonding agent 2, the clamper 10
A and 10B are driven to rotate each of the disks 1A and 1B once (see FIG. 4). As a result, the divergence point moves along the circumferential direction of the disk, so that the bonding agent 2 permeates evenly between the disk 1A and the disk 1B (see FIG. 5).

Next, the injection pipe 11a is pulled out from the diverging point, and the diverging point is gradually brought into contact. And clamper 1
The discs 1A and 1B are rotated at a high speed by driving the discs 0A and 10B, and excess adhesive 2 between the discs 1A and 1B is shaken off and removed (see FIG. 6). Finally, the UV (ultraviolet) lamps 12A and 12B disposed on both sides of the disks 1A and 1B are turned on, and the bonding material 2 between the disks 1A and 1B is irradiated with ultraviolet rays to cure the bonding material 2. (See FIG. 7).

The reason why a bonded layer free from airiness or the like can be formed by the above method can be explained as follows. That is, when the two discs 1A and 1B are opposed to each other and their central parts are clamped, the discs 1A and 1B are attracted by static electricity between them and the physical force of the water molecule layer. In this state, a high-viscosity material such as the bonding agent 2 is applied to each of the disks 1A and 1B by capillary action.
It cannot be penetrated between

Therefore, when a part of the outer circumference of each of the disks 1A and 1B is separated, as shown in FIG.
A gap is created between 1B in a fan shape. The portion other than the gap is still attracted by the above-described physical force. When the bonding agent 2 is injected from the fan-shaped gap, the bonding agent 2 stays at the tip of the fan-shaped gap. It should be noted that the staying portion does not include feelings or the like.

When each of the discs 1A and 1B is rotated to move the fan-shaped gap, the contact moves from the inner circumference of the disk to the outer circumference of the disk in a point-like manner. As a result, air is always removed from the inside of the disc toward the outside of the disc, so that air bubbles and the like do not enter the bonding layer. When it is necessary to strictly control the thickness of the bonding layer, a spacer for defining the thickness of the bonding layer is formed in advance or inserted in a clamp portion at the center of each of the disks 1A and 1B, and thereafter, The above steps may be performed first.

Here, a disk created by the conventional disk bonding method and a disk manufactured by the disk bonding method of the above embodiment will be compared with specific examples. Comparative Example 1 0.6 cc of an ultraviolet curable resin was prepared as a bonding agent 2, and the ultraviolet curable resin was dropped in a ring shape at a position of a radius of 23 mm on one disk 1A set on the spin coater 20. Then, another disk 1B is lowered at a speed of 0.1 mm / second from the position 1 mm above the previous disk 1A, and after 10 seconds, the disks 1A and 1B are brought into contact with each other, and the contact state is maintained for 20 seconds. Then, the ultraviolet curable resin was permeated between the disks 1A and 1B.

Thereafter, each of the disks 1A and 1B is
By rotating the disk at 1 rpm, excess ultraviolet curable resin between the disks 1A and 1B is shaken off, and ultraviolet light is applied to each of the disks 1A and 1B.
The ultraviolet curable resin between B was irradiated and cured to complete the bonding of the disks 1A and 1B. As a result, although the thickness of the bonding layer was 20 ± 4 μm, it was confirmed that about 100 bubbles having a diameter of 1 mm or more were mixed in the bonding layer.

Embodiment 1 Two discs 1A and 1B are opposed to each other,
A, 10B clamps a radius of 22 mm from the center of each of the disks 1A, 1B, separates a part of the outer periphery of each of the disks 1A, 1B, and moves the injection tube 11a of the injection device 11 from each of the disks 1A, 1B from the separated position. It was inserted up to the vicinity of the clamp. Then, an ultraviolet curable resin is applied as a bonding agent 2 from the tip of the injection tube 11a to the disk 1A and the disk
While dropping at a rate of 0.6 cc / sec.
A and 1B were rotated once at 60 rpm.

Thereafter, the discrepancy between the disks 1A and 1B is closed for one second, and the disks 1A and 1B are
pm to shake off excess UV curable resin between the disks 1A and 1B,
Irradiate and cure the UV curable resin between
The bonding of A and 1B was completed. As a result, the thickness of the bonding layer was 20 μm and 2 μm, and it was confirmed that no air bubbles or the like were mixed in the bonding layer.

COMPARATIVE EXAMPLE 2 0.6 cc of an ultraviolet-curable resin was prepared as a bonding agent 2, and the ultraviolet-curable resin was dropped in a ring shape at a position of a radius of 23 mm on one disk 1 A set on the spin coater 20. Then, another disk 1B is lowered at a speed of 0.1 mm / second from the position 1 mm above the previous disk 1A, and after 10 seconds, the disks 1A and 1B are brought into contact with each other, and the contact state is maintained for 20 seconds. Then, the ultraviolet curable resin was permeated between the disks 1A and 1B.

Thereafter, each of the disks 1A and 1B is
By rotating the disk at 1 rpm, excess ultraviolet curable resin between the disks 1A and 1B is shaken off, and ultraviolet light is applied to each of the disks 1A and 1B.
The ultraviolet curable resin between B was irradiated and cured to complete the bonding of the disks 1A and 1B. As a result, in order to increase the thickness of the bonding layer, the number of rotations of the extra ultraviolet curable resin was reduced, and the uniformity of the bonding layer was reduced to 40 ± 10 μm. It was confirmed that about 200 bubbles having a diameter of 1 mm or more were mixed. .

Embodiment 2 A double-sided tape having a thickness of 40 μm is sandwiched between spacers as a spacer between the centers of the two disks 1A and 1B to a radius of 22 mm as opposed to each other, and the centers of the disks 1A and 1B are clamped by clampers 10A and 10B. To a radius of 22 mm from each other, a part of the outer circumference of each of the disks 1A and 1B was displaced, and the injection tube 11a of the injection device 11 was inserted from the disengagement point to the vicinity of the clamp portion of each of the disks 1A and 1B. Then, an ultraviolet curable resin is injected as the bonding agent 2 into the injection pipe 11.
0.6 between the disc 1A and the disc 1B from the tip of a.
While dropping at a rate of cc / sec, each disc 1A, 1B
One revolution at pm.

Thereafter, the discrepancies between the disks 1A and 1B are closed for one second, and the disks 1A and 1B are
pm to shake off excess UV curable resin between the disks 1A and 1B,
Irradiate and cure the UV curable resin between
The bonding of A and 1B was completed. As a result, the thickness of the bonding layer was 40 μm and 4 μm, and it was confirmed that no air bubbles or the like were mixed in the bonding layer.

[0027]

As described above, according to the present invention, it is possible to form a bonding layer having no air bubbles or the like despite the bonding in a short time, so that the number of man-hours for bonding disks can be reduced. As well as the quality of the disc.

[Brief description of the drawings]

FIG. 1 is a first diagram for explaining an embodiment of a method of bonding disks according to the present invention;

FIG. 2 is a second diagram for explaining an embodiment of the method of bonding disks according to the present invention;

FIG. 3 is a third diagram for explaining an embodiment of the method of bonding disks according to the present invention;

FIG. 4 is a fourth diagram for explaining an embodiment of the method of bonding disks according to the present invention;

FIG. 5 is a fifth diagram for describing an embodiment of the method of bonding disks according to the present invention;

FIG. 6 is a sixth diagram illustrating an embodiment of the method of bonding disks according to the present invention;

FIG. 7 is a seventh diagram for describing an embodiment of a method of bonding disks according to the present invention;

FIG. 8 is a first diagram illustrating an example of a conventional method of attaching disks.

FIG. 9 is a second diagram illustrating an example of a conventional method of attaching disks.

FIG. 10 is a third diagram illustrating an example of a conventional method of attaching disks.

FIG. 11 is a fourth diagram illustrating an example of a conventional method of attaching disks.

FIG. 12 is a fifth diagram for explaining an example of a conventional method of attaching disks.

FIG. 13 is a sixth diagram illustrating an example of a conventional disk bonding method.

[Explanation of symbols]

1A, 1B: disk, 2: bonding agent, 1
0A, 10B ... clamper, 11 ... injection device, 1
1a: Injection tube, 12A, 12B: UV lamp

Claims (2)

[Claims] When bonding two disks, the disks are opposed to each other, a center portion of the disks is clamped, a part of an outer periphery of the disks is separated, and a bonding agent is injected from the separated portion. A method of laminating disks, wherein the disk is rotated to move the divergence portion, and the bonding agent is allowed to permeate between the disks. 2. The method according to claim 1, wherein a spacer for controlling a thickness of a bonding layer is sandwiched in a central region of the disk when the disks are opposed to each other.