JPH11238260A - Device and method for manufacturing disk shaped information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate air bubbles liable to be generated in the adhesivie of the substrates, that are joined together, by overlapping a disk shaped first substrate, on which adhesive is spread, and a disk shaped second substrate having a specific thickness and joining them without applying a rotary force. SOLUTION: The thickness of a first substrate L0 and a second substrate L1 is set within the range of 0.55 to 0.63 mm. For the substrates L0 and L1, reflective films 202 and 203 and protective films 220 and 224, are formed, respectively. Then, adhesive 201 is uniformly applied over the film 220 of the substrate L0 in the atmosphere. UV curing resin is selected for the adhesive. Then, the substrate L0 and L1 are placed in a vacuum chamber and overlapped. The pressure in the chamber is maintained at a constant pressure of either 100 Pa or 20000 Pa and joined. Thus, no need for repeating pressure reduction or pressure increase operations, the process is simplified and the adhesive layer, in which the adhesive is well adapted to the surfaces, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a disc-shaped information recording medium for manufacturing a disc-shaped information recording medium by bonding a plurality of disc-shaped bases using an adhesive, and a disc. The present invention relates to an apparatus for manufacturing an information recording medium in the shape of a circle.

[0002]

2. Description of the Related Art In recent years, high-density recording media capable of recording or reproducing a large amount of information have appeared. This type of high-density recording medium is made by bonding a plurality of disk-shaped substrates via an adhesive. This type of disc-shaped information recording medium, for example, an optical disc, is particularly called a digital video disc or a digital versatile disc (DVD, trade name). As a method of bonding a plurality of disk-shaped substrates with an adhesive, there is a method of applying a UV curable resin (ultraviolet curable resin) as an adhesive between the substrates by a spinner method.

FIG. 8 shows a conventional lamination type disc-shaped information recording medium 200. In this disc-shaped information recording medium, a substrate L0 and a substrate L1 are bonded via an adhesive layer 201. . A reflection film 2 is provided on one surface of the base L0.
No. 02 is formed, and a reflection film 203 is formed on one surface of the substrate L1. The adhesive layer 201 adheres the reflection films 202 and 203 to each other. These platforms L0,
For example, necessary signals are formed in L1 in advance, and reflection films 202 and 203 are formed on the surfaces thereof. Light 204 from an optical pickup (not shown)
Is irradiated from the side of the substrate L0, the signal is read by the return light of the signal of the reflection film 202 through the substrate L0, or the light of the optical pickup is irradiated through the substrate L0, the reflection film 202, and the adhesive layer 201, and the return is performed. By obtaining light from the reflective film 203, a signal of the reflective film 203 is read.

[0004]

However, in the conventional disk-shaped information recording medium 200 as shown in FIG. 8, when air bubbles 205 enter the adhesive layer 201, light 204 from the optical pickup is generated. The refraction of light occurs at the bubble 205, and the light does not hit the signal pit surface to be read, or the required amount of light does not return to the optical pickup, and the signal on the reflection film 203 cannot be read.

FIGS. 9 and 10 show an example in which the adhesive 201 is applied by a spinner method. In FIG. 9, the adhesive 2
01 is dropped in a ring shape on the inner surface of the base L0, and another base L1 is stacked on the base L0. Thereafter, the stacked substrates L0 and L1 are rotated at a high speed to set the thickness of the adhesive 201 to a predetermined value.

However, in this method, if the speed at which the substrates L0 and L1 are stacked is high, depending on the speed, FIG.
As shown in the figure, from the relationship between the air pressure generated in the base L0 and the viscosity of the adhesive 201, the air on the lower surface of the base L1
Is pushed away, and when the substrate L1 comes into contact with the adhesive 201, the adhesive 201 embraces the air bubbles 210. Most of the bubbles 210 are out of the bonding surface together with the adhesive 201 by spinning, but are not perfect. The embedment of the bubbles 210 can be reduced by reducing the speed at which the substrates L0 and L1 are stacked, but it cannot be completely eliminated, and if the speed at which the substrates L0 and L1 are stacked is reduced, the production speed decreases.

FIG. 11 shows another conventional method of applying the adhesive 201. In FIG. 11, two substrates L0,
L1 is arranged to face in parallel, a nozzle 213 is inserted between them, and the two substrates L0 and L1 are simultaneously rotated to discharge the adhesive 201 so as to contact the respective surfaces. This reduces the formation of bubbles, but the presence or absence of bubbles depends on the rotation speed and the amount of adhesive discharged, and it is difficult to completely remove bubbles from the adhesive. The nozzle 21
In order to insert 3, it is necessary to keep the gap between the bases L0 and L1 constant, to accurately control the position of the nozzle 213, and to move the nozzle 213 in and out. Therefore, these operations take time and the production speed is reduced.

Accordingly, the present invention solves the above-mentioned problem, and when bonding the first disk-shaped substrate and the second disk-shaped substrate using an adhesive, the adhesive does not contain air bubbles. It is another object of the present invention to provide a method of manufacturing a disk-shaped information recording medium and a manufacturing apparatus of a disk-shaped information recording medium, in which a first base and a second base can be bonded with high productivity.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to provide a disk-shaped information recording device by bonding a disk-shaped first substrate and a disk-shaped second substrate using an adhesive. When manufacturing a medium, an adhesive application step of applying an adhesive to a first base to a predetermined film thickness in the air, the first base with the adhesive applied, and no adhesive applied The second substrate is placed in a vacuum atmosphere, and the first substrate coated with the adhesive and the second substrate not coated with the adhesive in a vacuum atmosphere at a constant pressure are
Moves relatively in the axial direction of the base without applying rotational force
And a substrate bonding step of directly bonding the first substrate and the second substrate via only the substrate adhesive.

In the present invention, when a disc-shaped information recording medium is manufactured by bonding a disc-shaped first base and a disc-shaped second base using an adhesive, the adhesive applying step includes: An adhesive is applied to the first substrate to a predetermined thickness in the air. In the substrate bonding step, the first substrate to which the adhesive has been applied and the second substrate to which no adhesive has been applied are arranged in a vacuum atmosphere,
The first substrate to which the adhesive has been applied and the second substrate to which no adhesive has been applied are relatively moved in the vacuum atmosphere at a constant pressure in the axial direction of the substrate without applying a rotational force to the first substrate. The first base and the second base are directly bonded only through the adhesive of the base.

[0011] Thus, the adhesive is applied to the first base in advance in the air in a predetermined thickness, so that the adhesive can be easily applied to the first base. Then, the first base to which the adhesive is applied and the second base to which no adhesive is applied are arranged in a vacuum atmosphere. The first base and the second base move relatively in the axial direction of the base without applying a rotational force, so that the first base and the second base are directly bonded in a vacuum atmosphere at a constant pressure. I do. Accordingly, the first atmosphere is in a vacuum atmosphere.
No air bubbles are formed in the adhesive between the base and the second base, and there is no need to apply a rotating force, so that the first and second bases can be securely and easily bonded in a short time. Can be stuck together.

In the present invention, the thickness of the disc-shaped first base and the disc-shaped second base is 0.55 mm to 0.63 mm. When the thickness of the disc-shaped first base and the disc-shaped second base is smaller than 0.55 mm, the birefringence becomes large in the formation of the base and the warp of the disk (the base alone or after bonding) ) Becomes large, and it becomes difficult to meet the prescribed standards. Further, when the thickness of the disc-shaped first base and the disc-shaped second base exceeds 0.63 mm, the tolerance of the inclination of the disc with respect to the pickup decreases in inverse proportion to the thickness of the disc. Considering the inclination accuracy of the pickup and the inclination accuracy of the disk, a substrate thickness exceeding 0.63 mm is not preferable. In the present invention, the pressure of the vacuum atmosphere is preferably 100 Pa to 20,000.
Pa. If the pressure of the vacuum atmosphere is smaller than 100 Pa, a small amount of volatile components will start to be released from the adhesive, which may impair the bonding performance. , The evacuation time becomes longer, and the exhaust pump requires a turbo-molecular pump in addition to the oil rotary pump, resulting in a wasteful configuration. If the pressure of the vacuum atmosphere is higher than 20,000 Pa, the presence of air cannot be ignored, which is contrary to the intention of the present invention.

The object of the present invention is to provide a disk-shaped information recording medium by bonding a disk-shaped first base and a disk-shaped second base using an adhesive. A first accommodating portion for accommodating a first substrate coated with an adhesive to a predetermined film thickness in the atmosphere and disposing the first substrate in a vacuum atmosphere, and accommodating a second substrate not coated with an adhesive. A second accommodating part for disposing the first accommodating part in the vacuum atmosphere, a base moving part for moving the first base from the first accommodating part and positioning it at a position facing the second base of the second accommodating part; The first base and the second base are moved along the axial direction of the base relatively without applying a rotational force in a vacuum atmosphere, thereby bonding the first base and the second base with the adhesive of the first base. And a substrate pressing portion to be adhered using only The method for producing a multi-address recording medium is achieved.

According to the present invention, when a disc-shaped information recording medium is manufactured by bonding a disc-shaped first base and a disc-shaped second base using an adhesive, the first accommodating portion includes: A first base on which an adhesive is applied to a predetermined film thickness in the atmosphere is accommodated and placed in a vacuum atmosphere. The second accommodating portion accommodates the second base to which the adhesive is not applied, and arranges the second base in a vacuum atmosphere.

The base moving section moves the first base from the first storage section and positions the first base at a position facing the base of the second storage section. The base pressing unit moves the first base and the second base along the axial direction of the base without applying a rotating force in a vacuum to apply the first base and the second base to the first base. Are bonded using only the above adhesive. Thereby, the first base to which the adhesive has been applied in advance in the atmosphere is placed in a vacuum atmosphere in the first storage section. On the other hand, the second substrate to which the adhesive has not been applied is placed in a vacuum atmosphere in the second storage section.

The base moving unit moves the first base from the first moving unit to face the second base of the second storage unit. The base pressing unit moves the first base and the second base relative to each other along the axial direction of the base without applying a rotational force to the first base and the second base, and thereby connects the first base and the second base to the first base. Can be adhered only with the adhesive. Thus, the adhesive is applied to the first base in advance in the air to a predetermined thickness, so that the adhesive can be easily applied to the first base.

The first substrate to which the adhesive is applied and the second substrate to which no adhesive is applied are arranged in a vacuum atmosphere. Then, the first base and the second base relatively move in the axial direction of the base without giving a rotating force,
The first substrate and the second substrate are directly bonded in a vacuum atmosphere at a constant pressure. Therefore, since it is in a vacuum atmosphere, no air bubbles are formed in the adhesive in the first and second bases, and there is no need to apply a rotating force. The base and the second base can be securely bonded and bonded.

[0018]

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

FIG. 1 shows a preferred embodiment of an apparatus for manufacturing a disc-shaped information recording medium according to the present invention. FIG.
The apparatus 10 for manufacturing a disc-shaped information recording medium shown in FIG. 1 has a first storage section 12, a second storage section 14, a base moving section 16, a base pressing section 18 and the like. The first accommodating section 12 and the second accommodating section 14 constitute a part of the vacuum chamber 20, and the first accommodating section 12 and the second accommodating section 14 are provided on one and other portions of the vacuum chamber 20. Is provided. The inside of the vacuum chamber 20 is constantly evacuated by the operation of the exhaust pump 22, and is maintained at a predetermined vacuum pressure, for example, a constant pressure of 100 Pa to 20000 Pa.
If the pressure of the vacuum atmosphere in the vacuum chamber 20 is lower than 100 Pa, a small amount of volatile components may start to be emitted from the adhesive, which may impair the bonding performance. , Which is not related to the effectiveness of the present invention, the evacuation time becomes long, and the exhaust pump requires a turbo-molecular pump in addition to the oil rotary pump, resulting in a useless configuration. If the pressure of the vacuum atmosphere is higher than 20,000 Pa, the presence of air cannot be ignored, which is contrary to the intention of the present invention.

The first accommodating section 12 has an access port 24, a load lock mechanism 26 and the like. The doorway 24
For example, it is formed in a circular shape on the upper surface of the casing 28 of the vacuum chamber 20. The load lock mechanism 26 includes the head 3
0, a base delivery tray 32 and a support 60. The head 30 of the load lock mechanism 26 can be moved in the Z direction (vertical direction) by a driving source (not shown). When the head 30 is lowered, the head 30 moves through the entrance 24 so that air does not enter or exit. It can be tightly sealed.

The transfer tray 32 of the base is fixed to a rod 36 of a cylinder 34. Thereby, the cylinder 34
When the is operated, the transfer tray 32 of the base moves up and down by a predetermined stroke in the Z direction. For example, the first base L coated with an adhesive can be placed on the base transfer tray 32. The access port 24 is evacuated to the outside by an exhaust pump (not shown) via an exhaust valve 40.

On the other hand, the second storage section 14 is
The second accommodating portion 14 roughly has a base entrance 124 and a load lock mechanism 126. An access port 124 for the base is formed at an upper portion of the casing 28. The load lock mechanism 126 includes a head 130, a transfer tray 132 on a base, and a support 62. The head 130 can be moved in the Z direction by driving means (not shown), and when the head 130 is lowered, the access opening 124 can be tightly sealed so that air does not leak. Delivery tray 1 for base
32 is fixed to the rod 136 of the cylinder 134. When the cylinder 134 operates, the transfer tray 1
32 moves up and down by a predetermined stroke along the Z direction. By moving the cylinder upward, the delivery tray of the base presses the support 62 against the inner wall of the vacuum chamber, thereby shutting off the inside of the vacuum chamber and the inlet / outlet 124. Further, the base L0 can be held. The transfer tray 132 of the base can hold the first base L0 sent from the first storage unit 12 by the base moving unit 16, for example.

Next, the base moving section 16 is arranged in the vacuum chamber 20 between the first housing section 12 and the second housing section 14. The base moving unit 16 receives the first base L0 placed on the transfer tray 32 of the base of the first storage unit 12 once, and rotates the first base L0. It is designed to be handed over. The base moving unit 16 has a rotating arm 50 and an actuator 52 for rotating the rotating arm 50. The actuator 52 is fixed to the casing 28 together with the cylinders 34 and 134. Actuator 5
The second operation shaft 54 is fixed to the center of the rotary arm 50, and can be indexed, for example, every 180 ° by the operation of the actuator 52.

A support 60 for supporting, for example, a first base L0 is provided at one end of the rotary arm 50, and a support 60 for supporting, for example, the first base L0, is provided at the other end of the rotary arm 50. A support 62 is provided.
These supports 60 and 62 are provided on the base transfer tray 32.
Is lowered in the Z direction, so that, for example, the first base L0 placed on the base transfer tray 32 can be supported in place of the base transfer tray 32 or 132. The control unit 100 controls the operations of the cylinders 34 and 134, the actuator 52, and the heads 30 and 130, and can also control the exhaust pump 22 and the like.

Next, referring to FIGS. 2 and 3, FIG.
A method of manufacturing the disc-shaped information recording medium D shown in FIG. First, as shown in FIGS. 2A and 2E, a first base L0 and a second base L1 are formed. This is shown in steps ST1 and ST in FIG.
6 is shown. The first base L0 and the second base L1 are
For example, a signal pit can be formed in the same manner as a conventional optical disk substrate. For example, the first substrate L0 and the second substrate L1 can be formed of a light-transmitting material such as polycarbonate.

The steps S in FIGS. 2B and 2F and FIG.
T2, as shown in step ST7, the reflection film 202 is formed on the first substrate L0, and the second substrate L
The reflective film 203 having a characteristic suitable for the purpose is formed for each of the reflective films 203. These reflection films 202,
203 is a metal film, for example, aluminum, gold,
A film of silver or semiconductor silicon is formed.

As shown in FIGS. 2C and 2G, the reflection film 202 of the first substrate L0 and the reflection film 20 of the second substrate L1
3, protective films 220 and 224 are respectively formed. The protective film may be omitted by selecting the material of the adhesive. This situation is shown in steps ST3 and ST8 in FIG.
Is shown in

Next, as shown in FIG. 2D, an adhesive 201 is uniformly applied on the protective film 220 of the first substrate L0. As the adhesive 201, for example, a resin that is cured by light irradiation, for example, a UV-curable resin (ultraviolet-curable resin) can be used. In this case, the adhesive 201
Can be applied while rotating by, for example, a conventionally used spinner method. The feature of the application of the adhesive 201 is that the step ST in FIG.
As shown by 4, the coating is performed in the atmosphere. Thereby, the adhesive 201 can be easily applied to the first base L0.

Steps ST5 and ST in FIG. 2 (H) and FIG.
As shown in ST9 and ST10, the first substrate L0 and the second substrate L1 are put in a vacuum chamber and superimposed and bonded. This will be described with reference to FIGS. 1, 4 to 6. The head 30 of the load lock mechanism 26 shown in FIG. 1 and FIG. 4 is raised in the Z direction, and the first opening 12 shown in FIG.
Is accommodated. In this state, as shown in FIG. 4, the adhesive 201 is located on the upper side, and the first base L0 is placed on the transfer tray 32 of the base. First accommodation section 12
At the same time or at another time when the first base L0 is inserted into the entrance 24 of the second accommodation portion 14, the entrance 12
On the fourth side, another second base L1 is prepared. For example, the head 130 of the load lock mechanism 126 sucks and holds the second base L1.

The head 30 in FIG. 4 is lowered in the Z direction to close the access port 24 in close contact, and the cylinder 34 is operated to lower the transfer tray 32 on the base in the Z direction. Thereby, as shown in FIG. 5, the base L0 is transferred from the transfer tray 32 of the base to the support 60 side. At this time, the delivery tray 132 on the other base is also lowered in the Z direction by the operation of the cylinder 134.

When the actuator 52 shown in FIG. 5 is operated, the rotary arm 50 is rotated by 180 °. As a result, the base L0 placed on the support 60 is positioned on the second storage section 14 side as shown in FIG. Thereafter, the cylinder 134 is operated to move up in the Z direction from the state of FIG. 6, so that the transfer tray 132 of the base receives the first base L0 from the support 60 and supports it. In this state, the first base L0 located on the side of the second storage portion 14 is located directly below the second base L1, and faces the second base L1 on which the adhesive is not applied. I have.

When the head 130 is lowered in the Z direction, the head 130 closes the access opening 124 completely tightly. At this time, the head 30 also closes the access opening 24 completely tightly. From this, the inside of the vacuum chamber 20 is maintained at a predetermined vacuum pressure, preferably 100 Pa to 200 Pa.
It is kept at any constant value of 00 Pa. And
When the rod 136 of the cylinder 134 rises in the Z direction, the first base L0 is moved in step ST1 of FIG.
The second base L1 is relatively close to the base in the axial direction, that is, the Z direction, and is completely bonded only through the adhesive 201. This bonding state is performed within a predetermined vacuum pressure of the vacuum chamber 20. From this, the adhesive 201
The air is completely drawn from the adhesive 201 without being mixed with air bubbles, and is exhausted to the outside by the exhaust pump 22. Moreover, the first base L0 and the second base L1 are:
It simply moves relatively linearly in the Z direction without being rotated, and can be overlapped and bonded only with the adhesive 201. From this, L0, L of both bases can be easily obtained.
1 can be bonded, and the production speed can be dramatically improved as compared with the case of rotating and bonding. Moreover, since the adhesive is not scattered around in comparison with the case of rotating, the production speed can be further increased.

The disc-shaped information recording medium D as shown in FIG. 2 (H), which is composed of the first substrate L0 and the second substrate L1 thus bonded, raises the head 130 in the Z direction. Thus, it can be taken out of the vacuum chamber 20 to the outside. The first housing 12 with an adhesive applied thereto
Is accommodated, and the second substrate L1 to which the adhesive is not applied is accommodated in the second accommodating portion 14 side. However, the arrangement is not limited to this, and the arrangement may be reversed. Alternatively, the adhesive may be applied to both the first base L0 and the second base L1. In the embodiment of the present invention, the adhesive is applied to the first substrate L0 in the atmosphere by, for example, a spinner method as shown in FIG. 2D, but the invention is not limited to this. The adhesive may be applied using other methods.

Next, as shown in FIGS. 2 (I), 2 (J) and 2 (K), the disc-shaped information recording medium thus bonded is taken out of the vacuum chamber in step ST11.
As shown in steps ST12 and ST13 in FIG. 3, the adhesive 201 is cured by irradiating ultraviolet rays, for example, and then the label is printed using the printing ink 240. As described above, the manufacture of the laminated disk-shaped information recording medium can be completed. In the case of label printing, the printing ink 240 is printed on the surface of the information recording medium D which is not the reading surface.

In the embodiment of the present invention, for example, an adhesive is applied to the first substrate L0 not in the vacuum chamber but in the air in advance. Then, in the vacuum chamber, the first substrate to which the adhesive has been applied and the second substrate to which the adhesive has not been applied are simply bonded to each other with only the adhesive, whereby air bubbles are generated in the adhesive. The first substrate and the second substrate can be completely bonded using only the adhesive without being involved. Thereby, there is no air between the fine irregularities on the surface of the adhesive and the substrate as the surface to be bonded, so that the familiarity of the adhesive is improved and the flatness can be maintained.

The base pressing portion 18 shown in FIG. 1 is constituted by the above-described cylinder 134, the base delivery tray 132 and the like. When the substrate pressing portion 18 is to press the first substrate L0 relatively to the second substrate L1 as shown in FIG. 6, the elastic force applying portion 70 applies a certain amount of elastic force. Can be. In other words, the elastic force applying section 70 has the moving section 71 and the spring 72, and when the first base L0 is pressed against the second base L1, the spring 72 exerts a force via the moving section 71. In the Z direction. Thereby, the first substrate L0 and the second substrate L1 can be securely stuck to each other via the adhesive. Such an elastic force applying section 70 is similarly provided on the delivery tray 132 of the other base.

In the embodiment of the present invention, it is not necessary to reduce the operation speed of the bonding mechanism as in the prior art in order to prevent the entrainment of air bubbles. Production speed can be increased. A defect at the time of manufacturing a disc-shaped information recording medium can be removed without mixing air bubbles into the adhesive, and the defect inspection can be omitted.
Before bonding the first substrate and the second substrate, the adhesive can be accurately applied to a desired position. That is, since the adhesive can be applied to the substrate in advance in the atmosphere, the finished disk-shaped information recording medium becomes clear.

In the embodiment described above, FIG.
In (G), the protective films 220 and 24 are formed but the protective film may not be formed. In this case, if an adhesive of a material that does not impair the reflective film is used for the material of the reflective film, the adhesive covers the reflective film and thus plays a role of protecting the reflective film.

Further, in the embodiment of the present invention, when the substrates are bonded together, the substrates are bonded in a stationary state without rotating, so that the scattering of the adhesive from the outer periphery of the substrate, which has conventionally occurred, is eliminated. Can be. The thickness of the first substrate and the second substrate is, for example, 0.55 mm to 0.6.
It is preferably 3 mm. 0.55mm thickness of base
If it is thinner, the birefringence will increase in the molding of the substrate, and the disk will warp (even after the substrate alone or after laminating).
Becomes large, and it becomes difficult to meet the prescribed standards. If the thickness of the base is larger than 0.63 mm, the tolerance of the inclination of the disk with respect to the pickup decreases in inverse proportion to the thickness of the disk. A substrate thickness exceeding 63 mm is not preferred. When bonding the substrates, the pressure in the vacuum atmosphere in the vacuum chamber should be 1
Since the operation can be performed while maintaining a constant value of any of 00 Pa to 20000 Pa, there is no need to repeat the depressurizing and pressurizing operations, and the operation can be simplified.

In the present invention, an adhesive is applied to one of the two discs to be stuck and put into a vacuum chamber. There is a rotating arm in the tank, and the disk is put on it. The disc to be used at another position is placed in a vacuum chamber and placed on the adhesive-coated disc. Since the disks are stacked in a vacuum chamber, no air enters the adhesive layer. In addition, since there is no air on the adhesive surface, the adhesive is well adapted to the adhesive surface and a uniform adhesive layer can be obtained by applying a little force when the disks are stacked.

FIG. 7 shows another embodiment of the manufacturing apparatus of the present invention, and the mechanism is simplified by using only a load lock mechanism for the vacuum part. In this case, the evacuation time is slightly longer than in the embodiment of FIG.
Practically, there is no problem. First base L0
Is transported in the atmosphere by the disk transport arm 550 to just below the second base L1. The disc trays 401 and 402 are lifted upward by the cylinder 434. At this time, the tray 402 of the disk
Touch the lower part of 65.

The disk carrying head 570 is in contact with the plate 565 holding the second base L1. At the same time that the tray 402 comes into contact with the plate 565, the three-way valve 580 operates in a direction connecting the inside of the plate 565 and the exhaust pump 582, and the atmosphere side operates in a closing direction. When the inside of the plate 565 reaches a predetermined vacuum pressure, the cylinder 4
34 further rises, and only the disk pan 401
Is in contact with the second base L1 while holding the base L0. When the bonding between the bases L0 and L1 is completed, the three-way valve 580 is operated so that the atmosphere side is opened and the exhaust pump 582 side is closed, and the atmosphere is introduced into the plate 565.

After the introduction into the atmosphere, the disk transport head 570 moves upward, rotates, and moves to the next disk transport head 570.
Holds the next second substrate L <b> 1 and waits until it comes into contact with the plate 565. The bonded disk is moved by the disk carrying arm 550 together with the disk trays 401 and 402 to a station where the next adhesive 201 is cured. Disk carrying arm 550
Are the next disk trays 401 and 402 and the first base L
It comes right below the second base L1 that is waiting with 0 on it.
Hereinafter, this operation is repeated. According to this,
The vacuum chamber 620 only needs to have a configuration in which a hole 625 is formed in the plate 565, an exhaust port 635 is provided in the hole 625, and the exhaust pipe 645 is bonded. The operation of the disk carrying arm 550 can be performed in the atmosphere. The benefits come out.

[0044]

As described above, according to the present invention,
When bonding the disc-shaped first base and the disc-shaped second base using an adhesive, the first base and the second base can be formed with productivity without containing air bubbles in the adhesive. Can be bonded well.

[Brief description of the drawings]

FIG. 1 is a view showing a preferred embodiment of an apparatus for manufacturing a disc-shaped information recording medium according to the present invention.

FIG. 2 is a diagram showing an example of a method for manufacturing a laminated disk-shaped information recording medium.

FIG. 3 is a flowchart showing the manufacturing method of FIG. 2;

FIG. 4 is a view showing a manufacturing process in the manufacturing apparatus of FIG. 1;

FIG. 5 is a diagram showing a state further advanced from the manufacturing process of FIG. 4;

FIG. 6 is a diagram showing a manufacturing process further advanced from the state of FIG. 5;

FIG. 7 is a diagram showing another embodiment of the manufacturing apparatus of the present invention.

FIG. 8 is a view showing a disc-shaped information recording medium manufactured by a conventional manufacturing method.

FIG. 9 is a view showing a state where an adhesive is dropped by a conventional manufacturing method.

FIG. 10 is a diagram showing a state in which a plurality of bases are about to be bonded by the dropped adhesive of FIG. 9;

FIG. 11 is a diagram showing another example of supplying a conventional adhesive.

[Explanation of symbols]

Reference numeral 10: apparatus for manufacturing a disc-shaped information recording medium, 12
... 1st accommodation part, 14 ... 2nd accommodation part, 16 ...
Base moving part, 18: Base pressing part, 20: Vacuum tank, D: Disc-shaped information recording medium, L0 ...
First base, L1... Second base

Claims (8)

[Claims] When manufacturing a disc-shaped information recording medium by bonding a disc-shaped first base and a disc-shaped second base using an adhesive, the first base is air-sealed. An adhesive application step of applying an adhesive to a predetermined film thickness in the inside, a first base on which the adhesive is applied, and a second base on which no adhesive is applied are arranged in a vacuum atmosphere to be fixed. The first substrate on which the adhesive has been applied and the second substrate on which the adhesive has not been applied are relatively moved in the vacuum atmosphere at a pressure of A method for manufacturing a disc-shaped information recording medium, comprising: a substrate bonding step of directly bonding a first substrate and a second substrate via only a substrate adhesive. 2. The disk-shaped first base and the disk-shaped second base have a thickness of 0.55 mm to 0.63 mm.
The method for manufacturing a disc-shaped information recording medium according to claim 1, wherein 3. The method for manufacturing a disc-shaped information recording medium according to claim 2, wherein the pressure of the vacuum atmosphere is 100 Pa to 20,000 Pa. 4. The disk-shaped information recording medium according to claim 1, wherein an adhesive is applied to both the first disk-shaped substrate and the second disk-shaped substrate in a predetermined thickness in the air. Production method. 5. When manufacturing a disc-shaped information recording medium by bonding a disc-shaped first base and a disc-shaped second base using an adhesive, the adhesive is applied to a predetermined film in the air. A first accommodating portion for accommodating the thickly applied first substrate and disposing it in a vacuum atmosphere, and a first accommodating portion for accommodating the second substrate not coated with an adhesive and disposing the second substrate in a vacuum atmosphere And a second base of the second storage part by moving the first base from the first storage part.
A base moving unit positioned at a position facing the base, and a first base and a second base which are relatively moved along the axial direction of the base without applying a rotational force in a vacuum atmosphere. An apparatus for manufacturing a disc-shaped information recording medium, comprising: a base pressing portion for bonding a first base and a second base using only an adhesive for the first base. 6. The thickness of the first disc-shaped base and the second disc-shaped base is 0.55 mm to 0.63 mm.
6. The apparatus for manufacturing a disc-shaped information recording medium according to claim 5, wherein 7. The apparatus for manufacturing a disc-shaped information recording medium according to claim 6, wherein the pressure of the vacuum atmosphere is 100 Pa to 20,000 Pa. 8. The base moving section rotates to rotate the first base.
6. The apparatus for manufacturing a disc-shaped information recording medium according to claim 5, wherein the first base is moved from the storage section and is positioned at a position facing the second base in the second storage section.